This is a tab-delimited list of names of native and naturalised taxa that are currently
(Sat Dec 22 20:34:22 2012) accepted or tentatively accepted for inclusion in the second edition of The Jepson Manual.
Common names are drawn from the first edition.

Abies amabilis Douglas ex J. Forbes	PINACEAE	PACIFIC SILVER FIR	native	
Abies bracteata (D. Don) A. Poit.	PINACEAE	BRISTLECONE FIR	native	
Abies concolor (Gordon & Glend.) Lindl. ex Hildebr.	PINACEAE	WHITE FIR	native	
Abies grandis (Douglas ex D. Don) Lindl.	PINACEAE	GRAND FIR	native	
Abies lasiocarpa (Hook.) Nutt.	PINACEAE		native	
Abies lasiocarpa (Hook.) Nutt. var. lasiocarpa	PINACEAE	SUBALPINE FIR	native	
Abies magnifica A. Murray bis	PINACEAE	CALIFORNIA RED FIR	native	
Abies magnifica A. Murray bis var. critchfieldii Lanner	PINACEAE		native	acceptance uncertain
Abies magnifica A. Murray bis var. magnifica	PINACEAE		native	
Abies magnifica A. Murray bis var. shastensis Lemmon	PINACEAE	SHASTA RED FIR	native	
Abies procera Rehder	PINACEAE	NOBLE FIR	native	
Abronia alpina Brandegee	NYCTAGINACEAE	RAMSHAW MEADOWS ABRONIA	native	
Abronia latifolia Eschsch.	NYCTAGINACEAE		native	
Abronia maritima S. Watson	NYCTAGINACEAE	RED SAND-VERBENA	native	
Abronia nana S. Watson	NYCTAGINACEAE		native	
Abronia nana S. Watson var. covillei (Heimerl) Munz	NYCTAGINACEAE	COVILLE'S DWARF ABRONIA	native	
Abronia pogonantha Heimerl	NYCTAGINACEAE		native	
Abronia turbinata S. Watson	NYCTAGINACEAE		native	
Abronia umbellata Lam.	NYCTAGINACEAE		native	
Abronia umbellata Lam. var. breviflora (Standl.) L. A. Galloway	NYCTAGINACEAE	PINK SAND-VERBENA	native	
Abronia umbellata Lam. var. umbellata	NYCTAGINACEAE		native	
Abronia villosa S. Watson	NYCTAGINACEAE		native	
Abronia villosa S. Watson var. aurita (Abrams) Jeps.	NYCTAGINACEAE	CHAPARRAL SAND-VERBENA	native	
Abronia villosa S. Watson var. villosa	NYCTAGINACEAE		native	
Abutilon palmeri A. Gray	MALVACEAE		native	
Abutilon parvulum A. Gray	MALVACEAE	DWARF ABUTILON	native	
Abutilon theophrasti Medik.	MALVACEAE	VELVET-LEAF	naturalized	
Acacia baileyana F. Muell.	FABACEAE	COOTAMUNDRA WATTLE	naturalized	
Acacia cyclops A. Cunn. ex G. Don	FABACEAE	WESTERN COASTAL WATTLE	naturalized	
Acacia dealbata Link	FABACEAE	SILVER WATTLE	naturalized	
Acacia farnesiana (L.) Willd. var. minuta (M.E. Jones) Seigler & Ebinger	FABACEAE		naturalized	
Acacia longifolia (Andrews) Willd.	FABACEAE	SYDNEY GOLDEN WATTLE	naturalized	
Acacia melanoxylon R. Br.	FABACEAE	BLACKWOOD ACACIA	naturalized	
Acacia redolens Maslin	FABACEAE	VANILLA-SCENTED WATTLE	naturalized	
Acacia saligna (Labill.) H. L. Wendl.	FABACEAE	GOLDEN WREATH WATTLE	naturalized	
Acaena novae-zelandiae Kirk	ROSACEAE	BIDDY-BIDDY	naturalized	
Acaena pallida (Kirk) Allan	ROSACEAE		naturalized	
Acaena pinnatifida Ruiz & Pav.	ROSACEAE		native	
Acaena pinnatifida Ruiz & Pav. var. californica (Bitter) Jeps.	ROSACEAE		native	
Acalypha californica Benth.	EUPHORBIACEAE		native	
Acamptopappus shockleyi A. Gray	ASTERACEAE	SHOCKLEY'S GOLDENHEAD	native	
Acamptopappus sphaerocephalus (Harv. & A. Gray) A. Gray	ASTERACEAE	RAYLESS GOLDENHEAD	native	
Acamptopappus sphaerocephalus (Harv. & A. Gray) A. Gray var. hirtellus S. F. Blake	ASTERACEAE		native	
Acamptopappus sphaerocephalus (Harv. & A. Gray) A. Gray var. sphaerocephalus	ASTERACEAE		native	
Acanthomintha duttonii (Abrams) Jokerst	LAMIACEAE	SAN MATEO THORNMINT	native	
Acanthomintha ilicifolia (A. Gray) A. Gray	LAMIACEAE	SAN DIEGO THORNMINT	native	
Acanthomintha lanceolata Curran	LAMIACEAE	SANTA CLARA THORNMINT	native	
Acanthomintha obovata Jeps.	LAMIACEAE		native	
Acanthomintha obovata Jeps. subsp. cordata Jokerst	LAMIACEAE	HEART-LEAVED THORNMINT	native	
Acanthomintha obovata Jeps. subsp. obovata	LAMIACEAE	SAN BENITO THORNMINT	native	
Acanthoscyphus parishii (Parry) Small	POLYGONACEAE	FLOWERY PUNCTUREBRACT	native	
Acanthoscyphus parishii (Parry) Small var. abramsii (E. A. McGregor) Reveal	POLYGONACEAE	ABRAMS' OXYTHECA	native	
Acanthoscyphus parishii (Parry) Small var. cienegensis (Ertter) Reveal	POLYGONACEAE	CIENEGA SECA OXYTHECA	native	
Acanthoscyphus parishii (Parry) Small var. goodmaniana (Ertter) Reveal	POLYGONACEAE	CUSHENBURY OXYTHECA	native	
Acanthoscyphus parishii (Parry) Small var. parishii	POLYGONACEAE	PARISH'S OXYTHECA	native	
Acer circinatum Pursh	SAPINDACEAE	VINE MAPLE	native	
Acer glabrum Torr.	SAPINDACEAE	MOUNTAIN MAPLE	native	
Acer glabrum Torr. var. diffusum (Greene) Smiley	SAPINDACEAE		native	
Acer glabrum Torr. var. glabrum	SAPINDACEAE		native	
Acer macrophyllum Pursh	SAPINDACEAE	BIG-LEAF MAPLE	native	
Acer negundo L.	SAPINDACEAE	BOX ELDER	native	
Acer saccharinum L.	SAPINDACEAE	SILVER MAPLE	naturalized	
Achillea millefolium L.	ASTERACEAE		native	
Achlys californica I. Fukuda & H.G. Baker	BERBERIDACEAE		native	
Achlys triphylla (Sm.) DC.	BERBERIDACEAE		native	
Achlys triphylla (Sm.) DC. subsp. triphylla	BERBERIDACEAE		native	
Achyrachaena mollis Schauer	ASTERACEAE		native	
Achyronychia cooperi Torr. & A. Gray	CARYOPHYLLACEAE	FROST-MAT	native	
Acleisanthes longiflora A. Gray	NYCTAGINACEAE	ANGEL TRUMPETS	native	
Acleisanthes nevadensis (Standl.) B. L.Turner	NYCTAGINACEAE	DESERT WING-FRUIT	native	
Acmispon americanus (Nutt.) Rydb.	FABACEAE		native	
Acmispon americanus (Nutt.) Rydb. var. americanus	FABACEAE		native	
Acmispon argophyllus (A. Gray) Brouillet	FABACEAE		native	
Acmispon argophyllus (A. Gray) Brouillet var. adsurgens (Dunkle) Brouillet	FABACEAE	SAN CLEMENTE ISLAND BIRD'S-FOOT TREFOIL	native	
Acmispon argophyllus (A. Gray) Brouillet var. argenteus (Dunkle) Brouillet	FABACEAE		native	
Acmispon argophyllus (A. Gray) Brouillet var. argophyllus	FABACEAE		native	
Acmispon argophyllus (A. Gray) Brouillet var. fremontii (A. Gray) Brouillet	FABACEAE		native	
Acmispon argophyllus (A. Gray) Brouillet var. niveus (Greene) Brouillet	FABACEAE	SANTA CRUZ ISLAND BIRD'S-FOOT TREFOIL	native	
Acmispon argyraeus (Greene) Brouillet	FABACEAE		native	
Acmispon argyraeus (Greene) Brouillet var. argyraeus	FABACEAE		native	
Acmispon argyraeus (Greene) Brouillet var. multicaulis (Ottley) Brouillet	FABACEAE	SCRUB LOTUS	native	
Acmispon argyraeus (Greene) Brouillet var. notitius (Isely) Brouillet	FABACEAE	PROVIDENCE MOUNTAINS LOTUS	native	
Acmispon brachycarpus (Benth.) D.D. Sokoloff	FABACEAE		native	
Acmispon cytisoides (Benth.) Brouillet	FABACEAE		native	
Acmispon dendroideus (Greene) Brouillet	FABACEAE		native	
Acmispon dendroideus (Greene) Brouillet var. dendroideus	FABACEAE	ISLAND BROOM	native	
Acmispon dendroideus (Greene) Brouillet var. traskiae (Eastw. ex Abrams) Brouillet	FABACEAE	SAN CLEMENTE ISLAND LOTUS	native	
Acmispon dendroideus (Greene) Brouillet var. veatchii (Greene) Brouillet	FABACEAE	SAN MIGUEL ISLAND DEERWEED	native	
Acmispon denticulatus (Drew) D.D. Sokoloff	FABACEAE		native	
Acmispon glaber (Vogel) Brouillet	FABACEAE	CALIFORNIA BROOM	native	
Acmispon glaber (Vogel) Brouillet var. brevialatus (Ottley) Brouillet	FABACEAE		native	
Acmispon glaber (Vogel) Brouillet var. glaber	FABACEAE		native	
Acmispon grandiflorus (Benth.) Brouillet	FABACEAE		native	
Acmispon grandiflorus (Benth.) Brouillet var. grandiflorus	FABACEAE		native	
Acmispon grandiflorus (Benth.) Brouillet var. macranthus (Greene) Brouillet	FABACEAE		native	
Acmispon haydonii (Orcutt) Brouillet	FABACEAE	PYGMY LOTUS	native	
Acmispon heermannii (Durand & Hilg.) Brouillet	FABACEAE		native	
Acmispon heermannii (Durand & Hilg.) Brouillet var. heermannii	FABACEAE		native	
Acmispon heermannii (Durand & Hilg.) Brouillet var. orbicularis (A. Gray) Brouillet	FABACEAE		native	
Acmispon junceus (Benth.) Brouillet	FABACEAE		native	
Acmispon junceus (Benth.) Brouillet var. biolettii (Greene) Brouillet	FABACEAE		native	
Acmispon junceus (Benth.) Brouillet var. junceus	FABACEAE		native	
Acmispon maritimus (Torr. & A. Gray) D.D. Sokoloff	FABACEAE		native	
Acmispon maritimus (Torr. & A. Gray) D.D. Sokoloff var. brevivexillus (Ottley) Brouillet	FABACEAE		native	
Acmispon maritimus (Torr. & A. Gray) D.D. Sokoloff var. maritimus	FABACEAE		native	
Acmispon micranthus (Torr. & A. Gray) Brouillet	FABACEAE		native	
Acmispon nevadensis (S. Watson) Brouillet	FABACEAE		native	
Acmispon nevadensis (S. Watson) Brouillet var. davidsonii (Greene) Brouillet	FABACEAE		native	
Acmispon nevadensis (S. Watson) Brouillet var. nevadensis	FABACEAE		native	
Acmispon parviflorus (Benth.) D.D. Sokoloff	FABACEAE		native	
Acmispon procumbens (Greene) Brouillet	FABACEAE		native	
Acmispon procumbens (Greene) Brouillet var. jepsonii (Ottley) Brouillet	FABACEAE		native	
Acmispon procumbens (Greene) Brouillet var. procumbens	FABACEAE		native	
Acmispon prostratus (Torr. & A. Gray) Brouillet	FABACEAE	NUTTALL'S ACMISPON	native	
Acmispon rigidus (Benth.) Brouillet	FABACEAE		native	
Acmispon rubriflorus (H. Sharsm.) D.D. Sokoloff	FABACEAE	RED-FLOWERED BIRD'S-FOOT TREFOIL	native	
Acmispon strigosus (Nutt.) Brouillet	FABACEAE		native	
Acmispon wrangelianus (Fisch. & C. A. Mey.) D. D. Sokoloff	FABACEAE		native	
Aconitum columbianum Nutt.	RANUNCULACEAE		native	
Aconitum columbianum Nutt. subsp. columbianum	RANUNCULACEAE		native	
Aconitum columbianum Nutt. subsp. viviparum (Greene) Brink	RANUNCULACEAE		native	
Aconogonon davisiae (W. H. Brewer ex A. Gray) Soják	POLYGONACEAE		native	
Aconogonon newberryi (Small) Soják	POLYGONACEAE		native	
Aconogonon phytolaccifolium (Meisn. ex Small) Small ex Rydb.	POLYGONACEAE		native	
Acourtia microcephala DC.	ASTERACEAE		native	
Acroptilon repens (L.) DC.	ASTERACEAE	RUSSIAN KNAPWEED	naturalized	
Actaea rubra (Aiton) Willd.	RANUNCULACEAE		native	
Adenocaulon bicolor Hook.	ASTERACEAE	TRAIL PLANT	native	
Adenophyllum cooperi (A. Gray) Strother	ASTERACEAE		native	
Adenophyllum porophylloides (A. Gray) Strother	ASTERACEAE		native	
Adenostoma fasciculatum Hook. & Arn.	ROSACEAE	GREASEWOOD	native	
Adenostoma fasciculatum Hook. & Arn. var. fasciculatum	ROSACEAE		native	
Adenostoma fasciculatum Hook. & Arn. var. obtusifolium S. Watson	ROSACEAE		native	
Adenostoma fasciculatum Hook. & Arn. var. prostratum Dunkle	ROSACEAE		native	
Adenostoma sparsifolium Torr.	ROSACEAE	RIBBON WOOD	native	
Adiantum aleuticum (Rupr.) C. A. Paris	PTERIDACEAE	FIVE-FINGER FERN	native	
Adiantum capillus-veneris L.	PTERIDACEAE	SOUTHERN MAIDENHAIR	native	
Adiantum jordanii Müll. Hal.	PTERIDACEAE	CALIFORNIA MAIDENHAIR	native	
Adolphia californica S. Watson	RHAMNACEAE	CALIFORNIA ADOLPHIA	native	
Adonis aestivalis L.	RANUNCULACEAE	SUMMER PHEASANT'S EYE	naturalized	
Aegilops cylindrica Host	POACEAE	JOINTED GOAT GRASS	naturalized	
Aegilops neglecta Req. ex Bertol.	POACEAE	THREE-AWNED GOAT GRASS	naturalized	
Aegilops triuncialis L.	POACEAE	BARBED GOAT GRASS	naturalized	
Aeonium arboreum (L.) Webb & Berthel.	CRASSULACEAE		naturalized	
Aeonium arboreum (L.) Webb & Berthel. var. arboreum	CRASSULACEAE		naturalized	
Aeonium haworthii Webb & Berthel.	CRASSULACEAE		naturalized	
Aesculus californica (Spach) Nutt.	SAPINDACEAE	CALIFORNIA BUCKEYE	native	
Agastache parvifolia Eastw.	LAMIACEAE		native	
Agastache urticifolia (Benth.) Kuntze	LAMIACEAE		native	
Agave deserti Engelm.	AGAVACEAE		native	
Agave deserti Engelm. var. deserti	AGAVACEAE	DESERT AGAVE	native	
Agave deserti Engelm. var. simplex (Gentry) W. C. Hodgs. & Reveal	AGAVACEAE	SIMPLE DESERT AGAVE	native	
Agave shawii Engelm.	AGAVACEAE		native	
Agave shawii Engelm. var. shawii	AGAVACEAE	SHAW AGAVE	native	
Agave utahensis Engelm.	AGAVACEAE	UTAH AGAVE	native	
Agave utahensis Engelm. var. eborispina (Hester) Breitung	AGAVACEAE	IVORY-SPINED AGAVE	native	
Agave utahensis Engelm. var. nevadensis Engelm. ex Greenm. & Roush	AGAVACEAE	CLARK MOUNTAIN AGAVE	native	
Ageratina adenophora (Spreng.) R. M. King & H. Rob.	ASTERACEAE	CROFTON WEED	naturalized	
Ageratina herbacea (A. Gray) R. M. King & H. Rob.	ASTERACEAE	DESERT AGERATINA	native	
Ageratina occidentalis (Hook.) R. M. King & H. Rob.	ASTERACEAE	WESTERN SNAKEROOT	native	
Ageratina shastensis (D. W. Taylor & Stebbins) R. M. King & H. Rob.	ASTERACEAE	SHASTA AGERATINA	native	
Agoseris apargioides (Less.) Greene	ASTERACEAE		native	
Agoseris apargioides (Less.) Greene var. apargioides	ASTERACEAE		native	
Agoseris apargioides (Less.) Greene var. eastwoodiae (Fedde) Munz	ASTERACEAE		native	
Agoseris apargioides (Less.) Greene var. maritima (E. Sheld.) Cronquist	ASTERACEAE		native	
Agoseris aurantiaca (Hook.) Greene	ASTERACEAE		native	
Agoseris aurantiaca (Hook.) Greene var. aurantiaca	ASTERACEAE		native	
Agoseris glauca (Pursh) Raf.	ASTERACEAE		native	
Agoseris glauca (Pursh) Raf. var. glauca	ASTERACEAE		native	
Agoseris grandiflora (Nutt.) Greene	ASTERACEAE		native	
Agoseris grandiflora (Nutt.) Greene var. grandiflora	ASTERACEAE		native	
Agoseris grandiflora (Nutt.) Greene var. leptophylla G. I. Baird	ASTERACEAE		native	
Agoseris heterophylla (Nutt.) Greene	ASTERACEAE		native	
Agoseris heterophylla (Nutt.) Greene var. cryptopleura Greene	ASTERACEAE		native	
Agoseris heterophylla (Nutt.) Greene var. heterophylla	ASTERACEAE		native	
Agoseris hirsuta (Hook.) Greene	ASTERACEAE		native	
Agoseris monticola Greene	ASTERACEAE		native	
Agoseris parviflora (Nutt.) D. Dietr.	ASTERACEAE		native	
Agoseris retrorsa (Benth.) Greene	ASTERACEAE		native	
Agrimonia gryposepala Wallr.	ROSACEAE	COMMON AGRIMONY	native	
Agrimonia striata Michx.	ROSACEAE	GROOVED AGRIMONY	native	
Agropyron cristatum (L.) Gaertn.	POACEAE		naturalized	
Agropyron cristatum (L.) Gaertn. subsp. pectinatum (M. Bieb.) Tzvelev	POACEAE		naturalized	
Agrostemma githago L.	CARYOPHYLLACEAE		naturalized	
Agrostemma githago L. var. githago	CARYOPHYLLACEAE		naturalized	
Agrostis avenacea J. F. Gmel.	POACEAE	PACIFIC BENT GRASS	naturalized	
Agrostis blasdalei Hitchc.	POACEAE	BLASDALE'S BENT GRASS	native	
Agrostis capillaris L.	POACEAE	COLONIAL BENT	naturalized	
Agrostis densiflora Vasey	POACEAE	CALIFORNIA BENT GRASS	native	
Agrostis elliottiana Schult.	POACEAE	SIERRA BENT GRASS	native	
Agrostis exarata Trin.	POACEAE	SPIKE BENT GRASS	native	
Agrostis gigantea Roth	POACEAE	REDTOP	naturalized	
Agrostis hallii Vasey	POACEAE	HALL'S BENT GRASS	native	
Agrostis hendersonii Hitchc.	POACEAE	HENDERSON'S BENT GRASS	native	
Agrostis hooveri Swallen	POACEAE	HOOVER'S BENT GRASS	native	
Agrostis humilis Vasey	POACEAE	MOUNTAIN BENT GRASS	native	
Agrostis idahoensis Nash	POACEAE	IDAHO REDTOP	native	
Agrostis microphylla Steud.	POACEAE	SMALL-LEAF BENT GRASS	native	
Agrostis oregonensis Vasey	POACEAE	OREGON REDTOP	native	
Agrostis pallens Trin.	POACEAE	DUNE BENT GRASS	native	
Agrostis scabra Willd.	POACEAE	ROUGH BENT GRASS	native	
Agrostis stolonifera L.	POACEAE	CREEPING BENT	naturalized	
Agrostis tandilensis (Kuntze) Parodi	POACEAE	KENNEDY'S BENT GRASS	naturalized	
Agrostis variabilis Rydb.	POACEAE	MOUNTAIN BENT GRASS	native	
Ailanthus altissima (Mill.) Swingle	SIMAROUBACEAE	TREE OF HEAVEN	naturalized	
Aira caryophyllea L.	POACEAE	SILVER HAIR GRASS	naturalized	
Aira elegans Willd. ex Roem. & Schult.	POACEAE	ELEGANT HAIR GRASS	naturalized	
Aira praecox L.	POACEAE	EARLY HAIR GRASS	naturalized	
Albizia julibrissin Durazz.	FABACEAE	MIMOSA	naturalized	
Albizia lophantha (Willd.) Benth.	FABACEAE	PLUME ACACIA	naturalized	
Alcea rosea L.	MALVACEAE	HOLLYHOCK	naturalized	
Alhagi maurorum Medik.	FABACEAE	CAMEL THORN	naturalized	
Aliciella humillima (Brand) J. M. Porter	POLEMONIACEAE	SMALLEST ALICIELLA	native	
Aliciella hutchinsifolia (Rydb.) J. M. Porter	POLEMONIACEAE	DESERT PALE ALICIELLA	native	
Aliciella latifolia (S. Watson) J. M. Porter	POLEMONIACEAE		native	
Aliciella latifolia (S. Watson) J. M. Porter subsp. latifolia	POLEMONIACEAE	BROAD-LEAVED ALICIELLA	native	
Aliciella leptomeria (A. Gray) J. M. Porter	POLEMONIACEAE	SAND ALICIELLA	native	
Aliciella lottiae (A.G. Day) J. M. Porter	POLEMONIACEAE	LOTT'S ALICIELLA	native	
Aliciella micromeria (A. Gray) J. M. Porter	POLEMONIACEAE	DAINTY ALICIELLA	native	
Aliciella monoensis J. M. Porter ined.	POLEMONIACEAE	MONO LAKE ALICIELLA	native	
Aliciella ripleyi (Barneby) J. M. Porter	POLEMONIACEAE	RIPLEY'S ALICIELLA	native	
Aliciella triodon (Eastw.) Brand	POLEMONIACEAE	COYOTE GILIA	native	
Alisma gramineum Lej.	ALISMATACEAE	GRASS ALISMA	native	
Alisma lanceolatum With.	ALISMATACEAE		naturalized	
Alisma triviale Pursh	ALISMATACEAE		native	
Allenrolfea occidentalis (S. Watson) Kuntze	CHENOPODIACEAE		native	
Allionia incarnata L.	NYCTAGINACEAE		native	
Allionia incarnata L. var. incarnata	NYCTAGINACEAE		native	
Allionia incarnata L. var. villosa (Standl.) Munz	NYCTAGINACEAE		native	
Allium abramsii (Ownbey & Aase ex Traub) McNeal	ALLIACEAE		native	
Allium acuminatum Hook.	ALLIACEAE		native	
Allium amplectens Torr.	ALLIACEAE		native	
Allium anceps Kellogg	ALLIACEAE		native	
Allium atrorubens S. Watson	ALLIACEAE		native	
Allium atrorubens S. Watson var. atrorubens	ALLIACEAE	GREAT BASIN ONION	native	
Allium atrorubens S. Watson var. cristatum (S. Watson) McNeal	ALLIACEAE	INYO ONION	native	
Allium bisceptrum S. Watson	ALLIACEAE		native	
Allium bolanderi S. Watson	ALLIACEAE		native	
Allium bolanderi S. Watson var. bolanderi	ALLIACEAE		native	
Allium bolanderi S. Watson var. mirabile (L. F. Hend.) McNeal	ALLIACEAE		native	
Allium burlewii Davidson	ALLIACEAE		native	
Allium campanulatum S. Watson	ALLIACEAE		native	
Allium cratericola Eastw.	ALLIACEAE		native	
Allium crispum Greene	ALLIACEAE		native	
Allium denticulatum (Ownbey & Aase ex Traub) McNeal	ALLIACEAE		native	
Allium diabolense (Ownbey & Aase ex Traub) McNeal	ALLIACEAE		native	
Allium dichlamydeum Greene	ALLIACEAE		native	
Allium falcifolium Hook. & Arn.	ALLIACEAE		native	
Allium fimbriatum S. Watson	ALLIACEAE		native	
Allium fimbriatum S. Watson var. fimbriatum	ALLIACEAE		native	
Allium fimbriatum S. Watson var. mohavense Jeps.	ALLIACEAE		native	
Allium fimbriatum S. Watson var. purdyi (Eastw.) McNeal	ALLIACEAE	PURDY'S ONION	native	
Allium haematochiton S. Watson	ALLIACEAE		native	
Allium hickmanii Eastw.	ALLIACEAE	HICKMAN'S ONION	native	
Allium hoffmanii Ownbey ex Traub	ALLIACEAE	BEEGUM ONION	native	
Allium howellii Eastw.	ALLIACEAE		native	
Allium howellii Eastw. var. clokeyi Ownbey & Aase ex Traub	ALLIACEAE	MOUNT PINOS ONION	native	
Allium howellii Eastw. var. howellii	ALLIACEAE		native	
Allium howellii Eastw. var. sanbenitense (Traub) McNeal & T. D. Jacobsen	ALLIACEAE		native	
Allium hyalinum Curran	ALLIACEAE		native	
Allium jepsonii (Ownbey & Aase ex Traub) S. Denison & McNeal	ALLIACEAE	JEPSON'S ONION	native	
Allium lacunosum S. Watson	ALLIACEAE		native	
Allium lacunosum S. Watson var. davisiae (M. E. Jones) McNeal & Ownbey	ALLIACEAE		native	
Allium lacunosum S. Watson var. kernense McNeal & Ownbey	ALLIACEAE		native	
Allium lacunosum S. Watson var. lacunosum	ALLIACEAE		native	
Allium lacunosum S. Watson var. micranthum Eastw.	ALLIACEAE		native	
Allium lemmonii S. Watson	ALLIACEAE		native	
Allium marvinii Davidson	ALLIACEAE	YUCAIPA ONION	native	
Allium membranaceum Ownbey ex Traub	ALLIACEAE		native	
Allium monticola Davidson	ALLIACEAE		native	
Allium munzii (Ownbey & Aase ex Traub) McNeal	ALLIACEAE	MUNZ'S ONION	native	
Allium neapolitanum Cirillo	ALLIACEAE		naturalized	
Allium nevadense S. Watson	ALLIACEAE	NEVADA ONION	native	
Allium obtusum Lemmon	ALLIACEAE		native	
Allium obtusum Lemmon var. conspicuum Mortola & McNeal	ALLIACEAE		native	
Allium obtusum Lemmon var. obtusum	ALLIACEAE		native	
Allium paniculatum L.	ALLIACEAE		naturalized	
Allium paniculatum L. var. paniculatum	ALLIACEAE		naturalized	
Allium parishii S. Watson	ALLIACEAE	PARISH'S ONION	native	
Allium parryi S. Watson	ALLIACEAE		native	
Allium parvum Kellogg	ALLIACEAE		native	
Allium peninsulare Lemmon ex Greene	ALLIACEAE		native	
Allium peninsulare Lemmon ex Greene var. franciscanum McNeal & Ownbey	ALLIACEAE	FRANCISCAN ONION	native	
Allium peninsulare Lemmon ex Greene var. peninsulare	ALLIACEAE		native	
Allium platycaule S. Watson	ALLIACEAE		native	
Allium praecox Brandegee	ALLIACEAE		native	
Allium punctum L. F. Hend.	ALLIACEAE	DOTTED ONION	native	
Allium sanbornii Alph. Wood	ALLIACEAE		native	
Allium sanbornii Alph. Wood var. congdonii Jeps.	ALLIACEAE	CONGDON'S ONION	native	
Allium sanbornii Alph. Wood var. sanbornii	ALLIACEAE	SANBORN'S ONION	native	
Allium serra McNeal & Ownbey	ALLIACEAE		native	
Allium sharsmithiae (Ownbey & Aase ex Traub) McNeal	ALLIACEAE	SHARSMITH'S ONION	native	
Allium shevockii McNeal	ALLIACEAE	SPANISH NEEDLE ONION	native	
Allium siskiyouense Ownbey ex Traub	ALLIACEAE	SISKIYOU ONION	native	
Allium tolmiei Baker	ALLIACEAE		native	
Allium tolmiei Baker var. tolmiei	ALLIACEAE		native	
Allium tribracteatum Torr.	ALLIACEAE	THREE-BRACTED ONION	native	
Allium triquetrum L.	ALLIACEAE		naturalized	
Allium tuolumnense (Ownbey & Aase ex Traub) S. S. Denison & McNeal	ALLIACEAE	RAWHIDE HILL ONION	native	
Allium unifolium Kellogg	ALLIACEAE		native	
Allium validum S. Watson	ALLIACEAE		native	
Allium vineale L.	ALLIACEAE		naturalized	
Allium yosemitense Eastw.	ALLIACEAE	YOSEMITE ONION	native	
Allophyllum divaricatum (Nutt.) A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Allophyllum gilioides (Benth.) A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Allophyllum gilioides (Benth.) A. D. Grant & V. E. Grant subsp. gilioides	POLEMONIACEAE		native	
Allophyllum gilioides (Benth.) A. D. Grant & V. E. Grant subsp. violaceum (A. Heller) A. G. Day	POLEMONIACEAE		native	
Allophyllum glutinosum (Benth.) A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Allophyllum integrifolium (Brand) A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Allotropa virgata Torr. & A. Gray	ERICACEAE		native	
Almutaster pauciflorus (Nutt.) Á. Löve & D. Löve	ASTERACEAE		native	
Alnus incana (L.) Moench	BETULACEAE		native	
Alnus incana (L.) Moench subsp. tenuifolia (Nutt.) Breitung	BETULACEAE	MOUNTAIN ALDER	native	
Alnus rhombifolia Nutt.	BETULACEAE	WHITE ALDER	native	
Alnus rubra Bong.	BETULACEAE	RED ALDER	native	
Alnus viridis (Chaix) Lam. & DC.	BETULACEAE	GREEN ALDER	native	
Alnus viridis (Chaix) Lam. & DC. subsp. fruticosa (Rupr.) Nyman	BETULACEAE	SIBERIAN ALDER	native	
Alnus viridis (Chaix) Lam. & DC. subsp. sinuata (Regel) Á. Löve & D. Löve	BETULACEAE	SITKA ALDER	native	
Aloe maculata All.	ASPHODELACEAE		naturalized	
Alopecurus aequalis Sobol.	POACEAE	SHORT-AWN FOXTAIL	native	
Alopecurus aequalis Sobol. var. aequalis	POACEAE		native	
Alopecurus aequalis Sobol. var. sonomensis P. Rubtzoff	POACEAE	SONOMA ALOPECURUS	native	
Alopecurus carolinianus Walter	POACEAE		native	
Alopecurus geniculatus L.	POACEAE	WATER FOXTAIL	native	
Alopecurus myosuroides Huds.	POACEAE		naturalized	
Alopecurus pratensis L.	POACEAE	MEADOW FOXTAIL	naturalized	
Alopecurus saccatus Vasey	POACEAE		native	
Aloysia wrightii (A. Gray ex Torr.) Abrams	VERBENACEAE	WRIGHT'S BEEBRUSH	native	
Alternanthera caracasana Kunth	AMARANTHACEAE		naturalized	
Alternanthera philoxeroides (Mart.) Griseb.	AMARANTHACEAE	ALLIGATOR WEED	naturalized	
Alyssum alyssoides (L.) L.	BRASSICACEAE		naturalized	
Alyssum desertorum Stapf	BRASSICACEAE		naturalized	
Alyssum simplex Rudolphi	BRASSICACEAE		naturalized	
Amaranthus albus L.	AMARANTHACEAE	TUMBLEWEED	naturalized	
Amaranthus arenicola I. M. Johnst.	AMARANTHACEAE	SAND AMARANTH	naturalized	
Amaranthus blitoides S. Watson	AMARANTHACEAE	PROCUMBENT PIGWEED	native	
Amaranthus californicus (Moq.) S. Watson	AMARANTHACEAE	CALIFORNIAN AMARANTH	native	
Amaranthus deflexus L.	AMARANTHACEAE		naturalized	
Amaranthus fimbriatus (Torr.) Benth. ex S. Watson	AMARANTHACEAE	FRINGED AMARANTH	native	
Amaranthus hybridus L.	AMARANTHACEAE	GREEN AMARANTH	naturalized	
Amaranthus palmeri S. Watson	AMARANTHACEAE	PALMER'S AMARANTH	native	
Amaranthus powellii S. Watson	AMARANTHACEAE	POWELL'S AMARANTH	native	
Amaranthus retroflexus L.	AMARANTHACEAE	REDROOT PIGWEED	naturalized	
Amaranthus torreyi (A. Gray) Benth. ex S. Watson	AMARANTHACEAE	TORREY'S AMARANTH	native	
Amaranthus tuberculatus (Moq.) J. D. Sauer	AMARANTHACEAE		naturalized	
Amaranthus tuberculatus (Moq.) J. D. Sauer var. rudis (J.D. Sauer) Costea & Tardif	AMARANTHACEAE	COMMON WATERHEMP	naturalized	
Amaranthus watsonii Standl.	AMARANTHACEAE	WATSON'S AMARANTH	native	
Amaryllis belladonna L.	AMARYLLIDACEAE	NAKED LADIES	naturalized	
Amauriopsis dissecta (A. Gray) Rydb.	ASTERACEAE		native	
Amblyopappus pusillus Hook. & Arn.	ASTERACEAE		native	
Ambrosia acanthicarpa Hook.	ASTERACEAE	ANNUAL BUR-SAGE	native	
Ambrosia ambrosioides (Cav.) Payne	ASTERACEAE	BIG BUR-SAGE	native	
Ambrosia artemisiifolia L.	ASTERACEAE	COMMON RAGWEED	naturalized	
Ambrosia chamissonis (Less.) Greene	ASTERACEAE	BEACH BUR-SAGE	native	
Ambrosia chenopodiifolia (Benth.) Payne	ASTERACEAE	SAN DIEGO BUR-SAGE	native	
Ambrosia confertiflora DC.	ASTERACEAE		native	
Ambrosia dumosa (A. Gray) Payne	ASTERACEAE	WHITE BUR-SAGE	native	
Ambrosia eriocentra (A. Gray) Payne	ASTERACEAE	WOOLLY BUR-SAGE	native	
Ambrosia ilicifolia (A. Gray) Payne	ASTERACEAE	HOLLY-LEAVED BUR-SAGE	native	
Ambrosia monogyra (Torr. & A. Gray) Strother & B. G. Baldwin	ASTERACEAE	SINGLEWHORL BURROBRUSH	native	
Ambrosia psilostachya DC.	ASTERACEAE	WESTERN RAGWEED	native	
Ambrosia pumila (Nutt.) A. Gray	ASTERACEAE	SAN DIEGO AMBROSIA	native	
Ambrosia salsola (Torr. & A. Gray) Strother & B. G. Baldwin	ASTERACEAE	CHEESEBUSH	native	
Ambrosia salsola (Torr. & A. Gray) Strother & B. G. Baldwin var. pentalepis (Rydb.) Strother & B. G. Baldwin	ASTERACEAE		native	
Ambrosia salsola (Torr. & A. Gray) Strother & B. G. Baldwin var. salsola	ASTERACEAE		native	
Amelanchier alnifolia (Nutt.) Nutt. ex M. Roem.	ROSACEAE		native	
Amelanchier alnifolia (Nutt.) Nutt. ex M. Roem. var. pumila (Torr. & A. Gray) C. K. Schneid.	ROSACEAE		native	
Amelanchier alnifolia (Nutt.) Nutt. ex M. Roem. var. semiintegrifolia (Hook.) C. L. Hitchc.	ROSACEAE		native	
Amelanchier utahensis Koehne	ROSACEAE	UTAH SERVICE-BERRY	native	
Ammannia coccinea Rottb.	LYTHRACEAE		native	
Ammannia robusta Heer & Regel	LYTHRACEAE		native	
Ammi majus L.	APIACEAE		naturalized	
Ammi visnaga (L.) Lam.	APIACEAE	BISNAGA	naturalized	
Ammophila arenaria (L.) Link	POACEAE	EUROPEAN BEACHGRASS	naturalized	
Ammoselinum giganteum J. M. Coult. & Rose	APIACEAE	DESERT SAND-PARSLEY	native	
Amorpha californica Nutt.	FABACEAE		native	
Amorpha californica Nutt. var. californica	FABACEAE		native	
Amorpha californica Nutt. var. napensis Jeps.	FABACEAE	NAPA FALSE INDIGO	native	
Amorpha fruticosa L.	FABACEAE		native	
Ampelodesmos mauritanicus (Poir.) T. Durand & Schinz	POACEAE		naturalized	
Ampelopsis brevipedunculata (Maxim.) Trautv.	VITACEAE		naturalized	acceptance uncertain
Amphipappus fremontii Torr. & A. Gray	ASTERACEAE		native	
Amphipappus fremontii Torr. & A. Gray var. fremontii	ASTERACEAE		native	
Amphipappus fremontii Torr. & A. Gray var. spinosus (A. Nelson) Ced. Porter	ASTERACEAE		native	
Amphiscirpus nevadensis (S. Watson) Oteng-Yeb.	CYPERACEAE		native	
Amsinckia douglasiana A. DC.	BORAGINACEAE	DOUGLAS' FIDDLENECK	native	
Amsinckia eastwoodiae J. F. Macbr.	BORAGINACEAE	EASTWOOD'S FIDDLENECK	native	
Amsinckia furcata Suksd.	BORAGINACEAE	FORKED FIDDLENECK	native	
Amsinckia grandiflora (A. Gray) Kleeb. ex Greene	BORAGINACEAE	LARGE-FLOWERED FIDDLENECK	native	
Amsinckia intermedia Fisch. & C. A. Mey.	BORAGINACEAE	COMMON FIDDLENECK	native	
Amsinckia lunaris J. F. Macbr.	BORAGINACEAE	BENT-FLOWERED FIDDLENECK	native	
Amsinckia lycopsoides Lehm.	BORAGINACEAE	BUGLOSS-FLOWERED FIDDLENECK	native	
Amsinckia menziesii (Lehm.) A. Nelson & J. F. Macbr.	BORAGINACEAE	SMALL-FLOWERED FIDDLENECK	native	
Amsinckia retrorsa Suksd.	BORAGINACEAE	RIGID FIDDLENECK	native	
Amsinckia spectabilis Fisch. & C. A. Mey.	BORAGINACEAE		native	
Amsinckia spectabilis Fisch. & C. A. Mey. var. microcarpa (Greene) Jeps. & Hoover	BORAGINACEAE	MESA FIDDLENECK	native	
Amsinckia spectabilis Fisch. & C. A. Mey. var. spectabilis	BORAGINACEAE	SEASIDE FIDDLENECK	native	
Amsinckia tessellata A. Gray	BORAGINACEAE		native	
Amsinckia tessellata A. Gray var. gloriosa (Suksd.) Hoover	BORAGINACEAE	CARRIZO FIDDLENECK	native	
Amsinckia tessellata A. Gray var. tessellata	BORAGINACEAE	DESERT FIDDLENECK	native	
Amsinckia vernicosa Hook. & Arn.	BORAGINACEAE	WAXY FIDDLENECK	native	
Amsonia tomentosa Torr. & Frém.	APOCYNACEAE		native	
Anagallis arvensis L.	MYRSINACEAE	SCARLET PIMPERNEL	naturalized	
Anagallis minima (L.) E. H. L. Krause	MYRSINACEAE	CHAFFWEED	native	
Anaphalis margaritacea (L.) Benth.	ASTERACEAE		native	
Anchusa officinalis L.	BORAGINACEAE	COMMON ALKANET	naturalized	
Ancistrocarphus filagineus A. Gray	ASTERACEAE	WOOLLY FISHHOOKS	native	
Ancistrocarphus keilii Morefield	ASTERACEAE	SANTA YNEZ GROUNDSTAR	native	
Andropogon glomeratus (Walter) Britton, Sterns, & Poggenb.	POACEAE		native	
Andropogon glomeratus (Walter) Britton, Sterns, & Poggenb. var. scabriglumis C. S. Campb.	POACEAE	SOUTHWESTERN BUSHY BLUESTEM	native	
Andropogon virginicus L.	POACEAE		naturalized	
Andropogon virginicus L. var. virginicus	POACEAE	BROOMSEDGE BLUESTEM	naturalized	
Androsace elongata L.	PRIMULACEAE		native	
Androsace elongata L. subsp. acuta (Greene) G. T. Robbins	PRIMULACEAE	CALIFORNIA ANDROSACE	native	
Androsace filiformis Retz.	PRIMULACEAE	SLENDER-STEMMED ANDROSACE	native	
Androsace occidentalis Pursh	PRIMULACEAE	WESTERN ROCK-JASMINE	native	
Androsace septentrionalis L.	PRIMULACEAE	PYGMY-FLOWER ROCK-JASMINE	native	
Androstephium breviflorum S. Watson	THEMIDACEAE	SMALL-FLOWERED ANDROSTEPHIUM	native	
Anelsonia eurycarpa (A. Gray) J. F. Macbr. & Payson	BRASSICACEAE		native	
Anemone deltoidea Hook.	RANUNCULACEAE		native	
Anemone drummondii S. Watson	RANUNCULACEAE		native	
Anemone drummondii S. Watson var. drummondii	RANUNCULACEAE		native	
Anemone grayi Behr & Kellogg	RANUNCULACEAE		native	
Anemone lyallii Britton	RANUNCULACEAE		native	
Anemone multifida Poir.	RANUNCULACEAE		native	
Anemone multifida Poir. var. multifida	RANUNCULACEAE		native	
Anemone occidentalis S. Watson	RANUNCULACEAE		native	
Anemone oregana A. Gray	RANUNCULACEAE		native	
Anemone oregana A. Gray var. oregana	RANUNCULACEAE		native	
Anemone tuberosa Rydb.	RANUNCULACEAE		native	
Anemopsis californica (Nutt.) Hook. & Arn.	SAURURACEAE	YERBA MANSA	native	
Anethum graveolens L.	APIACEAE	DILL	naturalized	
Angelica arguta Nutt.	APIACEAE	ANGELICA	native	
Angelica breweri A. Gray	APIACEAE		native	
Angelica californica Jeps.	APIACEAE		native	
Angelica callii Mathias & Constance	APIACEAE	CALL'S ANGELICA	native	
Angelica genuflexa Nutt.	APIACEAE		native	
Angelica hendersonii J. M. Coult. & Rose	APIACEAE		native	
Angelica kingii (S. Watson) J. M. Coult. & Rose	APIACEAE	KING'S ANGELICA	native	
Angelica lineariloba A. Gray	APIACEAE		native	
Angelica lucida L.	APIACEAE	SEA-WATCH	native	
Angelica tomentosa S. Watson	APIACEAE		native	
Anisocarpus madioides Nutt.	ASTERACEAE	WOODLAND TARWEED	native	
Anisocarpus scabridus (Eastw.) B. G. Baldwin	ASTERACEAE	SCABRID ALPINE TARPLANT	native	
Anisocoma acaulis Torr. & A. Gray	ASTERACEAE		native	
Anoda cristata (L.) Schltdl.	MALVACEAE	VIOLETTAS	naturalized	
Antennaria argentea Benth.	ASTERACEAE		native	
Antennaria corymbosa E. E. Nelson	ASTERACEAE		native	
Antennaria dimorpha (Nutt.) Torr. & A. Gray	ASTERACEAE		native	
Antennaria flagellaris (A. Gray) A. Gray	ASTERACEAE	STOLONIFEROUS PUSSY-TOES	native	
Antennaria geyeri A. Gray	ASTERACEAE		native	
Antennaria howellii Greene	ASTERACEAE		native	
Antennaria howellii Greene subsp. howellii	ASTERACEAE		native	
Antennaria luzuloides Torr. & A. Gray	ASTERACEAE		native	
Antennaria luzuloides Torr. & A. Gray subsp. aberrans (E. E. Nelson) R. J. Bayer & Stebbins	ASTERACEAE		native	
Antennaria luzuloides Torr. & A. Gray subsp. luzuloides	ASTERACEAE		native	
Antennaria marginata Greene	ASTERACEAE	WHITE-MARGINED EVERLASTING	native	
Antennaria media Greene	ASTERACEAE		native	
Antennaria microphylla Rydb.	ASTERACEAE		native	
Antennaria pulchella Greene	ASTERACEAE	BEAUTIFUL PUSSY-TOES	native	
Antennaria racemosa Hook.	ASTERACEAE		native	
Antennaria rosea Greene	ASTERACEAE		native	
Antennaria rosea Greene subsp. confinis (Greene) R. J. Bayer	ASTERACEAE		native	
Antennaria rosea Greene subsp. rosea	ASTERACEAE		native	
Antennaria suffrutescens Greene	ASTERACEAE	EVERGREEN EVERLASTING	native	
Antennaria umbrinella Rydb.	ASTERACEAE		native	
Anthemis arvensis L.	ASTERACEAE	CORN CHAMOMILE	naturalized	
Anthemis cotula L.	ASTERACEAE	MAYWEED	naturalized	
Anthoxanthum aristatum Boiss.	POACEAE		naturalized	
Anthoxanthum aristatum Boiss. subsp. aristatum	POACEAE	ANNUAL VERNAL GRASS	naturalized	
Anthoxanthum nitens (Weber) Y. Schouten & Veldkamp subsp. nitens	POACEAE	VANILLA GRASS	native	
Anthoxanthum occidentale (Buckley) Veldkamp	POACEAE	CALIFORNIA SWEET GRASS	native	
Anthoxanthum odoratum L.	POACEAE	SWEET VERNAL GRASS	naturalized	
Anthriscus caucalis M. Bieb.	APIACEAE	BUR-CHERVIL	naturalized	
Antirrhinum cornutum Benth.	PLANTAGINACEAE		native	
Antirrhinum coulterianum Benth. ex A. DC.	PLANTAGINACEAE		native	
Antirrhinum filipes A. Gray	PLANTAGINACEAE		native	
Antirrhinum kelloggii Greene	PLANTAGINACEAE		native	
Antirrhinum kingii S. Watson	PLANTAGINACEAE		native	
Antirrhinum leptaleum A. Gray	PLANTAGINACEAE		native	
Antirrhinum multiflorum Pennell	PLANTAGINACEAE		native	
Antirrhinum nuttallianum Benth. ex A. DC.	PLANTAGINACEAE		native	
Antirrhinum nuttallianum Benth. ex A. DC. subsp. nuttallianum	PLANTAGINACEAE		native	
Antirrhinum nuttallianum Benth. ex A. DC. subsp. subsessile (A. Gray) D. M. Thomps.	PLANTAGINACEAE		native	
Antirrhinum ovatum Eastw.	PLANTAGINACEAE	OVAL-LEAVED SNAPDRAGON	native	
Antirrhinum subcordatum A. Gray	PLANTAGINACEAE	DIMORPHIC SNAPDRAGON	native	
Antirrhinum vexillocalyculatum Kellogg	PLANTAGINACEAE		native	
Antirrhinum vexillocalyculatum Kellogg subsp. breweri (A. Gray) D. M. Thomps.	PLANTAGINACEAE		native	
Antirrhinum vexillocalyculatum Kellogg subsp. intermedium D. M. Thomps.	PLANTAGINACEAE		native	
Antirrhinum vexillocalyculatum Kellogg subsp. vexillocalyculatum	PLANTAGINACEAE		native	
Antirrhinum virga A. Gray	PLANTAGINACEAE	TWIG-LIKE SNAPDRAGON	native	
Anulocaulis annulatus (Coville) Standl.	NYCTAGINACEAE		native	
Apera interrupta (L.) P. Beauv.	POACEAE		naturalized	
Apera spica-venti (L.) P. Beauv.	POACEAE		naturalized	
Aphanes occidentalis (Nutt.) Rydb.	ROSACEAE		native	
Aphanisma blitoides Moq.	CHENOPODIACEAE	APHANISMA	native	
Apiastrum angustifolium Nutt.	APIACEAE		native	
Apium graveolens L.	APIACEAE	CELERY	naturalized	
Apocynum androsaemifolium L.	APOCYNACEAE	BITTER DOGBANE	native	
Apocynum cannabinum L.	APOCYNACEAE	INDIAN HEMP	native	
Aponogeton distachyos L. f.	APONOGETONACEAE	CAPE-PONDWEED	naturalized	
Aptenia cordifolia (L. f.) Schwantes	AIZOACEAE	BABY SUN-ROSE	naturalized	
Aquilegia eximia Van Houtte ex Planch..	RANUNCULACEAE		native	
Aquilegia formosa Fisch. ex DC.	RANUNCULACEAE		native	
Aquilegia pubescens Coville	RANUNCULACEAE		native	
Aquilegia shockleyi Eastw.	RANUNCULACEAE		native	
Arabidopsis thaliana (L.) Heynh.	BRASSICACEAE	THALE CRESS	naturalized	
Arabis blepharophylla Hook. & Arn.	BRASSICACEAE	COAST ROCKCRESS	native	
Arabis eschscholtziana Ledeb.	BRASSICACEAE		native	
Arabis mcdonaldiana Eastw.	BRASSICACEAE	MCDONALD'S ROCKCRESS	native	
Arabis modesta Rollins	BRASSICACEAE	MODEST ROCKCRESS	native	
Arabis oregana Rollins	BRASSICACEAE	OREGON ROCKCRESS	native	
Arabis pycnocarpa M. Hopkins	BRASSICACEAE		native	
Arabis pycnocarpa M. Hopkins var. pycnocarpa	BRASSICACEAE		native	
Aralia californica S. Watson	ARALIACEAE	ELK CLOVER	native	
Araujia sericifera Brot.	APOCYNACEAE		naturalized	
Arbutus menziesii Pursh	ERICACEAE	PACIFIC MADRONE	native	
Arceuthobium americanum Nutt. ex Engelm.	VISCACEAE	LODGEPOLE-PINE DWARF MISTLETOE	native	
Arceuthobium campylopodum Engelm.	VISCACEAE	WESTERN DWARF MISTLETOE	native	
Arceuthobium douglasii Engelm.	VISCACEAE	DOUGLAS-FIR DWARF MISTLETOE	native	
Arctium lappa L.	ASTERACEAE		naturalized	
Arctium minus (Hill) Bernh.	ASTERACEAE		naturalized	
Arctomecon merriamii Coville	PAPAVERACEAE	WHITE BEAR POPPY	native	
Arctostaphylos andersonii A. Gray	ERICACEAE	ANDERSON'S MANZANITA	native	
Arctostaphylos auriculata Eastw.	ERICACEAE	MOUNT DIABLO MANZANITA	native	
Arctostaphylos bakeri Eastw.	ERICACEAE		native	
Arctostaphylos bakeri Eastw. subsp. bakeri	ERICACEAE	BAKER'S MANZANITA	native	
Arctostaphylos bakeri Eastw. subsp. sublaevis P. V. Wells	ERICACEAE	THE CEDARS MANZANITA	native	
Arctostaphylos canescens Eastw.	ERICACEAE		native	
Arctostaphylos canescens Eastw. subsp. canescens	ERICACEAE	HOARY MANZANITA	native	
Arctostaphylos canescens Eastw. subsp. sonomensis (Eastw.) P. V. Wells	ERICACEAE	SONOMA CANESCENT MANZANITA	native	
Arctostaphylos catalinae P. V. Wells	ERICACEAE	SANTA CATALINA ISLAND MANZANITA	native	
Arctostaphylos columbiana Piper	ERICACEAE	COLUMBIA MANZANITA	native	
Arctostaphylos confertiflora Eastw.	ERICACEAE	SANTA ROSA ISLAND MANZANITA	native	
Arctostaphylos crustacea Eastw.	ERICACEAE		native	
Arctostaphylos crustacea Eastw. subsp. crinita (J.E. Adams) V.T. Parker, M.C. Vasey, & J.E. Keeley	ERICACEAE	CRINITE MANZANITA	native	
Arctostaphylos crustacea Eastw. subsp. crustacea	ERICACEAE		native	
Arctostaphylos crustacea Eastw. subsp. eastwoodiana (P.V. Wells) V.T. Parker, M.C. Vasey, & J.E. Keeley	ERICACEAE	EASTWOOD'S BRITTLE-LEAF MANZANITA	native	
Arctostaphylos crustacea Eastw. subsp. insulicola (P.V. Wells) V.T. Parker, M.C. Vasey, & J.E. Keeley	ERICACEAE	ISLAND MANZANITA	native	
Arctostaphylos crustacea Eastw. subsp. rosei (Eastw.) V.T. Parker, M.C. Vasey, & J.E. Keeley	ERICACEAE	ROSE'S MANZANITA	native	
Arctostaphylos crustacea Eastw. subsp. subcordata (Eastw.) V.T. Parker, M.C. Vasey, & J.E. Keeley	ERICACEAE	SANTA CRUZ ISLAND MANZANITA	native	
Arctostaphylos cruzensis Roof	ERICACEAE	ARROYO DE LA CRUZ MANZANITA	native	
Arctostaphylos densiflora Baker	ERICACEAE	VINE HILL MANZANITA	native	
Arctostaphylos edmundsii J. T. Howell	ERICACEAE	LITTLE SUR MANZANITA	native	
Arctostaphylos franciscana Eastw.	ERICACEAE	FRANCISCAN MANZANITA	native	
Arctostaphylos gabilanensis V. T. Parker & M. C. Vasey	ERICACEAE	GABILAN MOUNTAINS MANZANITA	native	
Arctostaphylos glandulosa Eastw.	ERICACEAE		native	
Arctostaphylos glandulosa Eastw. subsp. adamsii (Munz) Munz	ERICACEAE		native	
Arctostaphylos glandulosa Eastw. subsp. crassifolia (Jeps.) P. V. Wells	ERICACEAE	DEL MAR MANZANITA	native	
Arctostaphylos glandulosa Eastw. subsp. cushingiana (Eastw.) J.E. Keeley, M.C. Vasey & V.T. Parker	ERICACEAE	CUSHING MANZANITA	native	
Arctostaphylos glandulosa Eastw. subsp. gabrielensis (P.V. Wells) J.E. Keeley, M.C. Vasey & V.T. Parker	ERICACEAE	SAN GABRIEL MANZANITA	native	
Arctostaphylos glandulosa Eastw. subsp. glandulosa	ERICACEAE		native	
Arctostaphylos glandulosa Eastw. subsp. howellii (Eastw.) P.V. Wells	ERICACEAE		native	
Arctostaphylos glandulosa Eastw. subsp. leucophylla J. E. Keeley, M. C. Vasey & V. T. Parker	ERICACEAE		native	
Arctostaphylos glandulosa Eastw. subsp. mollis (J. E. Adams) P. V. Wells	ERICACEAE		native	
Arctostaphylos glauca Lindl.	ERICACEAE		native	
Arctostaphylos glutinosa B. Schreib.	ERICACEAE	SCHREIBER'S MANZANITA	native	
Arctostaphylos hispidula Howell	ERICACEAE	HOWELL'S MANZANITA	native	
Arctostaphylos hookeri G. Don	ERICACEAE		native	
Arctostaphylos hookeri G. Don subsp. hearstiorum (Hoover & Roof) P. V. Wells	ERICACEAE	HEARSTS' MANZANITA	native	
Arctostaphylos hookeri G. Don subsp. hookeri	ERICACEAE	HOOKER'S MANZANITA	native	
Arctostaphylos hooveri P. V. Wells	ERICACEAE	HOOVER'S MANZANITA	native	
Arctostaphylos imbricata Eastw.	ERICACEAE	SAN BRUNO MOUNTAIN MANZANITA	native	
Arctostaphylos insularis Greene ex Parry	ERICACEAE		native	
Arctostaphylos klamathensis S. W. Edwards, Keeler-Wolf & W. Knight	ERICACEAE	KLAMATH MANZANITA	native	
Arctostaphylos luciana P. V. Wells	ERICACEAE	SANTA LUCIA MANZANITA	native	
Arctostaphylos malloryi (W. Knight & Gankin) P. V. Wells	ERICACEAE	MALLORY'S MANZANITA	native	
Arctostaphylos manzanita Parry	ERICACEAE		native	
Arctostaphylos manzanita Parry subsp. elegans (Jeps.) P. V. Wells	ERICACEAE	KONOCTI MANZANITA	native	
Arctostaphylos manzanita Parry subsp. glaucescens P. V. Wells	ERICACEAE		native	
Arctostaphylos manzanita Parry subsp. laevigata (Eastw.) Munz	ERICACEAE	CONTRA COSTA MANZANITA	native	
Arctostaphylos manzanita Parry subsp. manzanita	ERICACEAE		native	
Arctostaphylos manzanita Parry subsp. roofii (Gankin) P. V. Wells	ERICACEAE		native	
Arctostaphylos manzanita Parry subsp. wieslanderi P. V. Wells	ERICACEAE		native	
Arctostaphylos mewukka Merriam	ERICACEAE		native	
Arctostaphylos mewukka Merriam subsp. mewukka	ERICACEAE		native	
Arctostaphylos mewukka Merriam subsp. truei (W. Knight) P. V. Wells	ERICACEAE	TRUE'S MANZANITA	native	
Arctostaphylos montana Eastw.	ERICACEAE		native	
Arctostaphylos montana Eastw. subsp. montana	ERICACEAE	MOUNT TAMALPAIS MANZANITA	native	
Arctostaphylos montana Eastw. subsp. ravenii (P.V. Wells) V.T. Parker, M.C. Vasey, & J.E. Keeley	ERICACEAE	PRESIDIO MANZANITA	native	
Arctostaphylos montaraensis Roof	ERICACEAE	MONTARA MANZANITA	native	
Arctostaphylos montereyensis Hoover	ERICACEAE	TORO MANZANITA	native	
Arctostaphylos morroensis Wiesl. & B. Schreib.	ERICACEAE	MORRO MANZANITA	native	
Arctostaphylos myrtifolia Parry	ERICACEAE	IONE MANZANITA	native	
Arctostaphylos nevadensis A. Gray	ERICACEAE		native	
Arctostaphylos nevadensis A. Gray subsp. knightii (Gankin & W.R. Hildreth) P.V. Wells	ERICACEAE	KNIGHT'S MANZANITA	native	
Arctostaphylos nevadensis A. Gray subsp. nevadensis	ERICACEAE	PINE-MAT MANZANITA	native	
Arctostaphylos nissenana Merriam	ERICACEAE	NISSENAN MANZANITA	native	
Arctostaphylos nortensis (P. V. Wells) P. V. Wells	ERICACEAE	DEL NORTE MANZANITA	native	
Arctostaphylos nummularia A. Gray	ERICACEAE		native	
Arctostaphylos nummularia A. Gray subsp. mendocinoensis (P.V. Wells) V.T. Parker, M.C. Vasey, & J.E. Keeley	ERICACEAE	PYGMY MANZANITA	native	
Arctostaphylos nummularia A. Gray subsp. nummularia	ERICACEAE		native	
Arctostaphylos obispoensis Eastw.	ERICACEAE	BISHOP MANZANITA	native	
Arctostaphylos ohloneana M. C. Vasey & V. T. Parker	ERICACEAE	OHLONE MANZANITA	native	
Arctostaphylos osoensis P. V. Wells	ERICACEAE	OSO MANZANITA	native	
Arctostaphylos otayensis Wiesl. & B. Schreib.	ERICACEAE	OTAY MANZANITA	native	
Arctostaphylos pacifica Roof	ERICACEAE	PACIFIC MANZANITA	native	
Arctostaphylos pajaroensis (J.E. Adams) J. E. Adams	ERICACEAE	PAJARO MANZANITA	native	
Arctostaphylos pallida Eastw.	ERICACEAE	PALLID MANZANITA	native	
Arctostaphylos parryana Lemmon	ERICACEAE		native	
Arctostaphylos parryana Lemmon subsp. desertica J. E. Keeley, L. M. Boykin & Massihi	ERICACEAE	DESERT MANZANITA	native	
Arctostaphylos parryana Lemmon subsp. parryana	ERICACEAE	PARRY MANZANITA	native	
Arctostaphylos parryana Lemmon subsp. tumescens J. E. Keeley, L. M. Boykin & Massihi	ERICACEAE	INTERIOR MANZANITA	native	
Arctostaphylos patula Greene	ERICACEAE	GREENLEAF MANZANITA	native	
Arctostaphylos pechoensis (Abrams) Dudley ex Eastw.	ERICACEAE	PECHO MANZANITA	native	
Arctostaphylos pilosula Jeps. & Wiesl.	ERICACEAE	SANTA MARGARITA MANZANITA	native	
Arctostaphylos pringlei Parry	ERICACEAE		native	
Arctostaphylos pringlei Parry subsp. drupacea (Parry) P. V. Wells	ERICACEAE		native	
Arctostaphylos pumila Nutt.	ERICACEAE	SANDMAT MANZANITA	native	
Arctostaphylos pungens Kunth	ERICACEAE		native	
Arctostaphylos purissima P. V. Wells	ERICACEAE	LA PURISIMA MANZANITA	native	
Arctostaphylos rainbowensis J. E. Keeley & Massihi	ERICACEAE	RAINBOW MANZANITA	native	
Arctostaphylos refugioensis Gankin	ERICACEAE	REFUGIO MANZANITA	native	
Arctostaphylos regismontana Eastw.	ERICACEAE	KINGS MOUNTAIN MANZANITA	native	
Arctostaphylos rudis Jeps. & Wiesl.	ERICACEAE	SAND MESA MANZANITA	native	
Arctostaphylos sensitiva Jeps.	ERICACEAE		native	
Arctostaphylos silvicola Jeps. & Wiesl.	ERICACEAE	BONNY DOON MANZANITA	native	
Arctostaphylos stanfordiana Parry	ERICACEAE		native	
Arctostaphylos stanfordiana Parry subsp. decumbens (P. V. Wells) P. V. Wells	ERICACEAE	RINCON RIDGE MANZANITA	native	
Arctostaphylos stanfordiana Parry subsp. raichei W. Knight	ERICACEAE	RAICHE'S MANZANITA	native	
Arctostaphylos stanfordiana Parry subsp. stanfordiana	ERICACEAE		native	
Arctostaphylos tomentosa (Pursh) Lindl.	ERICACEAE		native	
Arctostaphylos tomentosa (Pursh) Lindl. subsp. bracteosa (DC.) J. E. Adams	ERICACEAE		native	
Arctostaphylos tomentosa (Pursh) Lindl. subsp. daciticola P. V. Wells	ERICACEAE	DACITE MANZANITA	native	
Arctostaphylos tomentosa (Pursh) Lindl. subsp. hebeclada (DC.) V.T. Parker, M.C. Vasey, & J.E. Keeley	ERICACEAE		native	
Arctostaphylos tomentosa (Pursh) Lindl. subsp. tomentosa	ERICACEAE		native	
Arctostaphylos uva-ursi (L.) Spreng.	ERICACEAE	KINNIKINNICK	native	
Arctostaphylos virgata Eastw.	ERICACEAE	MARIN MANZANITA	native	
Arctostaphylos viridissima (Eastw.) McMinn	ERICACEAE	WHITE-HAIRED MANZANITA	native	
Arctostaphylos viscida Parry	ERICACEAE		native	
Arctostaphylos viscida Parry subsp. mariposa (Dudley) P. V. Wells	ERICACEAE	MARIPOSA MANZANITA	native	
Arctostaphylos viscida Parry subsp. pulchella (Howell) P. V. Wells	ERICACEAE		native	
Arctostaphylos viscida Parry subsp. viscida	ERICACEAE		native	
Arctotheca calendula (L.) Levyns	ASTERACEAE	CAPEWEED	naturalized	
Arctotheca prostrata (Salisb.) Britten	ASTERACEAE	PROSTRATE CAPEWEED	naturalized	
Arctotis venusta Norl.	ASTERACEAE	BLUE-EYED AFRICAN DAISY	naturalized	
Arenaria lanuginosa (Michx.) Rohrb.	CARYOPHYLLACEAE		native	
Arenaria lanuginosa (Michx.) Rohrb. var. saxosa (A. Gray) Zarucchi, R. L. Hartm., & Rabeler	CARYOPHYLLACEAE	SPREADING SANDWORT	native	
Arenaria paludicola B. L. Rob.	CARYOPHYLLACEAE	MARSH SANDWORT	native	
Arenaria serpyllifolia L.	CARYOPHYLLACEAE		naturalized	
Arenaria serpyllifolia L. var. serpyllifolia	CARYOPHYLLACEAE	THYMELEAF SANDWORT	naturalized	
Argemone corymbosa Greene	PAPAVERACEAE		native	
Argemone munita Durand & Hilg.	PAPAVERACEAE	CHICALOTE	native	
Argyranthemum foeniculaceum (Willd.) Sch. Bip.	ASTERACEAE		naturalized	
Argyrochosma jonesii (Maxon) Windham	PTERIDACEAE	JONES' FALSE CLOAK-FERN	native	
Argyrochosma limitanea (Maxon) Windham	PTERIDACEAE		native	
Argyrochosma limitanea (Maxon) Windham subsp. limitanea	PTERIDACEAE	SOUTHWESTERN FALSE CLOAK-FERN	native	
Aristida adscensionis L.	POACEAE	SIXWEEKS THREE-AWN	native	
Aristida californica Thurb.	POACEAE	MOJAVE THREE-AWN	native	
Aristida dichotoma Michx.	POACEAE	CHURCHMOUSE THREE-AWN	naturalized	
Aristida divaricata Humb. & Bonpl. ex Willd.	POACEAE	POVERTY THREE-AWN	native	
Aristida oligantha Michx.	POACEAE	OLDFIELD THREE-AWN	native	
Aristida purpurea Nutt.	POACEAE		native	
Aristida purpurea Nutt. var. fendleriana (Steud.) Vasey	POACEAE	FENDLER THREE-AWN	native	
Aristida purpurea Nutt. var. longiseta (Steud.) Vasey	POACEAE	RED THREE-AWN	native	
Aristida purpurea Nutt. var. nealleyi (Vasey) Allred	POACEAE	NEALLEY THREE-AWN	native	
Aristida purpurea Nutt. var. parishii (Hitchc.) Allred	POACEAE	PARISH THREE-AWN	native	
Aristida purpurea Nutt. var. purpurea	POACEAE	PURPLE THREE-AWN	native	
Aristida purpurea Nutt. var. wrightii (Nash) Allred	POACEAE	WRIGHT THREE-AWN	native	
Aristida ternipes Cav.	POACEAE		native	
Aristida ternipes Cav. var. gentilis (Henrard) Allred	POACEAE	HOOK THREE-AWN	native	
Aristocapsa insignis (Curran) Reveal & Hardham	POLYGONACEAE	INDIAN VALLEY SPINEFLOWER	native	
Aristolochia californica Torr.	ARISTOLOCHIACEAE		native	
Armeria maritima (Mill.) Willd.	PLUMBAGINACEAE		native	
Armeria maritima (Mill.) Willd. subsp. californica (Boiss.) A. E. Porsild	PLUMBAGINACEAE		native	
Armoracia rusticana P. Gaertn., B. Mey. & Scherb.	BRASSICACEAE	HORSE RADISH	naturalized	
Arnica cernua Howell	ASTERACEAE	SERPENTINE ARNICA	native	
Arnica chamissonis Less.	ASTERACEAE	CHAMISSO ARNICA	native	
Arnica cordifolia Hook.	ASTERACEAE	HEARTLEAF ARNICA	native	
Arnica dealbata (A. Gray) B. G. Baldwin	ASTERACEAE	MOCK LEOPARDBANE	native	
Arnica discoidea Benth.	ASTERACEAE	RAYLESS ARNICA	native	
Arnica fulgens Pursh	ASTERACEAE	HILLSIDE ARNICA	native	
Arnica lanceolata Nutt. subsp. prima (Maguire) Strother & S.J. Wolf	ASTERACEAE	CLASPING ARNICA	native	
Arnica latifolia Bong.	ASTERACEAE	BROADLEAF ARNICA	native	
Arnica longifolia D. C. Eaton	ASTERACEAE	SPEARLEAF ARNICA	native	
Arnica mollis Hook.	ASTERACEAE	HAIRY ARNICA	native	
Arnica nevadensis A. Gray	ASTERACEAE	SIERRA ARNICA	native	
Arnica ovata Greene	ASTERACEAE	STICKY LEAF ARNICA	native	
Arnica parryi A. Gray	ASTERACEAE	NODDING ARNICA	native	
Arnica sororia Greene	ASTERACEAE	TWIN ARNICA	native	
Arnica spathulata Greene	ASTERACEAE	KLAMATH ARNICA	native	
Arnica venosa H. M. Hall	ASTERACEAE	SHASTA COUNTY ARNICA	native	
Arnica viscosa A. Gray	ASTERACEAE	MOUNT SHASTA ARNICA	native	
Arrhenatherum elatius (L.) J. Presl & C. Presl	POACEAE	TALL OAT GRASS	naturalized	
Artemisia absinthium L.	ASTERACEAE		naturalized	acceptance uncertain
Artemisia arbuscula Nutt.	ASTERACEAE	LOW SAGEBRUSH	native	
Artemisia arbuscula Nutt. subsp. arbuscula	ASTERACEAE		native	
Artemisia arbuscula Nutt. subsp. longiloba (Osterh.) L. M. Shultz	ASTERACEAE		native	
Artemisia biennis Willd.	ASTERACEAE	BIENNIAL WORMWOOD	naturalized	
Artemisia bigelovii A. Gray	ASTERACEAE	BIGELOW SAGEWORT	native	
Artemisia borealis Pall.	ASTERACEAE		native	
Artemisia borealis Pall. subsp. borealis	ASTERACEAE	BOREAL SAGE	native	
Artemisia californica Less.	ASTERACEAE	CALIFORNIA SAGEBRUSH	native	
Artemisia campestris L. var. scouleriana (Hook.) Cronquist	ASTERACEAE		native	acceptance uncertain
Artemisia cana Pursh	ASTERACEAE		native	
Artemisia cana Pursh subsp. bolanderi (A. Gray) G. H. Ward	ASTERACEAE	SILVER SAGEBRUSH	native	
Artemisia douglasiana Besser	ASTERACEAE	MUGWORT	native	
Artemisia dracunculus L.	ASTERACEAE	TARRAGON	native	
Artemisia ludoviciana Nutt.	ASTERACEAE	SILVER WORMWOOD	native	
Artemisia ludoviciana Nutt. subsp. albula (Wooton) D. D. Keck	ASTERACEAE		native	
Artemisia ludoviciana Nutt. subsp. candicans (Rydb.) D. D. Keck	ASTERACEAE		native	
Artemisia ludoviciana Nutt. subsp. incompta (Nutt.) D. D. Keck	ASTERACEAE		native	
Artemisia ludoviciana Nutt. subsp. ludoviciana	ASTERACEAE		native	
Artemisia michauxiana Besser	ASTERACEAE	LEMON SAGEWORT	native	
Artemisia nesiotica P. H. Raven	ASTERACEAE	ISLAND SAGEBRUSH	native	
Artemisia norvegica Fr.	ASTERACEAE		native	
Artemisia norvegica Fr. subsp. saxatilis (Besser) H. M. Hall & Clem.	ASTERACEAE	ALPINE SAGEWORT	native	
Artemisia nova A. Nelson	ASTERACEAE	BLACK SAGEBRUSH	native	
Artemisia palmeri A. Gray	ASTERACEAE	SAN DIEGO SAGEWORT	native	
Artemisia pycnocephala (Less.) DC.	ASTERACEAE	COASTAL SAGEWORT	native	
Artemisia rothrockii A. Gray	ASTERACEAE	ROTHROCK SAGEBRUSH	native	
Artemisia spiciformis Osterh.	ASTERACEAE	SNOWFIELD SAGEBRUSH	native	
Artemisia spinescens D. C. Eaton	ASTERACEAE	BUDSAGE	native	
Artemisia suksdorfii Piper	ASTERACEAE	COASTAL MUGWORT	native	
Artemisia tridentata Nutt.	ASTERACEAE		native	
Artemisia tridentata Nutt. subsp. parishii (A. Gray) H. M. Hall & Clem.	ASTERACEAE		native	
Artemisia tridentata Nutt. subsp. tridentata	ASTERACEAE	BIG SAGEBRUSH	native	
Artemisia tridentata Nutt. subsp. vaseyana (Rydb.) Beetle	ASTERACEAE	MOUNTAIN SAGEBRUSH	native	
Artemisia tridentata Nutt. subsp. wyomingensis Beetle & A. L. Young	ASTERACEAE	WYOMING SAGEBRUSH	native	
Artemisia tripartita Rydb.	ASTERACEAE		native	acceptance uncertain
Arthrocnemum subterminale (Parish) Standl.	CHENOPODIACEAE		native	
Arum italicum Mill.	ARACEAE	ITALIAN ARUM	naturalized	
Aruncus dioicus (Walter) Fernald	ROSACEAE		native	
Aruncus dioicus (Walter) Fernald var. acuminatus (Rydb.) H. Hara	ROSACEAE		native	
Arundo donax L.	POACEAE	GIANT REED	naturalized	
Asarum caudatum Lindl.	ARISTOLOCHIACEAE		native	
Asarum hartwegii S. Watson	ARISTOLOCHIACEAE		native	
Asarum lemmonii S. Watson	ARISTOLOCHIACEAE		native	
Asarum marmoratum Piper	ARISTOLOCHIACEAE	MARBLED WILD-GINGER	native	
Asclepias albicans S. Watson	APOCYNACEAE	WHITE-STEMMED MILKWEED	native	
Asclepias asperula (Decne.) Woodson	APOCYNACEAE		native	
Asclepias asperula (Decne.) Woodson subsp. asperula	APOCYNACEAE	ANTELOPE-HORNS	native	
Asclepias californica Greene	APOCYNACEAE	CALIFORNIA MILKWEED	native	
Asclepias cordifolia (Benth.) Jeps.	APOCYNACEAE	PURPLE MILKWEED	native	
Asclepias cryptoceras S. Watson	APOCYNACEAE	HUMBOLDT MOUNTAINS MILKWEED	native	
Asclepias eriocarpa Benth.	APOCYNACEAE	KOTOLO	native	
Asclepias erosa Torr.	APOCYNACEAE	DESERT MILKWEED	native	
Asclepias fascicularis Decne.	APOCYNACEAE	NARROW-LEAF MILKWEED	native	
Asclepias nyctaginifolia A. Gray	APOCYNACEAE	MOJAVE MILKWEED	native	
Asclepias solanoana Woodson	APOCYNACEAE	SERPENTINE MILKWEED	native	
Asclepias speciosa Torr.	APOCYNACEAE	SHOWY MILKWEED	native	
Asclepias subulata Decne.	APOCYNACEAE	RUSH MILKWEED	native	
Asclepias vestita Hook. & Arn.	APOCYNACEAE	WOOLLY MILKWEED	native	
Asparagus asparagoides (L.) Druce	ASPARAGACEAE		naturalized	
Asparagus officinalis L.	ASPARAGACEAE		naturalized	
Asparagus officinalis L. subsp. officinalis	ASPARAGACEAE		naturalized	
Asparagus setaceus (Kunth) Jessop	ASPARAGACEAE		naturalized	
Asperugo procumbens L.	BORAGINACEAE		naturalized	
Asphodelus fistulosus L.	ASPHODELACEAE		naturalized	
Aspidotis californica (Hook.) Copel.	PTERIDACEAE	CALIFORNIA LACE FERN	native	
Aspidotis carlotta-halliae (W. H. Wagner & E. F. Gilbert) Lellinger	PTERIDACEAE	CARLOTTA HALL'S LACE FERN	native	
Aspidotis densa (Brack.) Lellinger	PTERIDACEAE	DENSE LACE FERN	native	
Asplenium septentrionale (L.) Hoffm.	ASPLENIACEAE	NORTHERN SPLEENWORT	native	
Asplenium trichomanes L.	ASPLENIACEAE		native	
Asplenium trichomanes L. subsp. trichomanes	ASPLENIACEAE	MAIDENHAIR SPLEENWORT	native	
Asplenium vespertinum Maxon	ASPLENIACEAE	WESTERN SPLEENWORT	native	
Asplenium viride Huds.	ASPLENIACEAE	GREEN SPLEENWORT	native	
Astragalus accidens S. Watson	FABACEAE		native	
Astragalus accidens S. Watson var. hendersonii (S. Watson) M. E. Jones	FABACEAE		native	
Astragalus acutirostris S. Watson	FABACEAE		native	
Astragalus agnicidus Barneby	FABACEAE	HUMBOLDT COUNTY MILKVETCH	native	
Astragalus agrestis Douglas ex G. Don	FABACEAE	FIELD MILKVETCH	native	
Astragalus albens Greene	FABACEAE	CUSHENBURY MILKVETCH	native	
Astragalus allochrous A. Gray	FABACEAE		native	
Astragalus allochrous A. Gray var. playanus (M. E. Jones) Isely	FABACEAE	PLAYA MILKVETCH	native	
Astragalus andersonii A. Gray	FABACEAE		native	
Astragalus anxius Meinke & Kaye	FABACEAE	ASH VALLEY MILKVETCH	native	
Astragalus argophyllus Nutt.	FABACEAE		native	
Astragalus argophyllus Nutt. var. argophyllus	FABACEAE	SILVER-LEAVED MILKVETCH	native	
Astragalus aridus A. Gray	FABACEAE		native	
Astragalus asymmetricus E. Sheld.	FABACEAE		native	
Astragalus atratus S. Watson	FABACEAE		native	
Astragalus atratus S. Watson var. mensanus M. E. Jones	FABACEAE	DARWIN MESA MILKVETCH	native	
Astragalus austiniae Brewer & S. Watson	FABACEAE		native	
Astragalus bernardinus M. E. Jones	FABACEAE		native	
Astragalus bicristatus A. Gray	FABACEAE	CRESTED MILKVETCH	native	
Astragalus bolanderi A. Gray	FABACEAE		native	
Astragalus brauntonii Parish	FABACEAE	BRAUNTON'S MILKVETCH	native	
Astragalus breweri A. Gray	FABACEAE	BREWER'S MILKVETCH	native	
Astragalus californicus (A. Gray) Greene	FABACEAE	KLAMATH MILKVETCH	native	
Astragalus calycosus Torr. ex S. Watson	FABACEAE		native	
Astragalus calycosus Torr. ex S. Watson var. calycosus	FABACEAE	TORREY'S MILKVETCH	native	
Astragalus canadensis L.	FABACEAE		native	
Astragalus canadensis L. var. brevidens (Gand.) Barneby	FABACEAE		native	
Astragalus casei A. Gray	FABACEAE		native	
Astragalus cicer L.	FABACEAE	CHICKPEA MILKVETCH	naturalized	acceptance uncertain
Astragalus cimae M. E. Jones	FABACEAE		native	
Astragalus cimae M. E. Jones var. cimae	FABACEAE	CIMA MILKVETCH	native	
Astragalus cimae M. E. Jones var. sufflatus Barneby	FABACEAE	INFLATED CIMA MILKVETCH	native	
Astragalus claranus Jeps.	FABACEAE	CLARA HUNT'S MILKVETCH	native	
Astragalus clevelandii Greene	FABACEAE	CLEVELAND'S MILKVETCH	native	
Astragalus coccineus Brandegee	FABACEAE	SCARLET MILKVETCH	native	
Astragalus congdonii S. Watson	FABACEAE		native	
Astragalus crotalariae (Benth.) Torr.	FABACEAE	SALTON MILKVETCH	native	
Astragalus curtipes A. Gray	FABACEAE	MORRO MILKVETCH	native	
Astragalus curvicarpus (A. Heller) Macbr.	FABACEAE		native	
Astragalus curvicarpus (A. Heller) Macbr. var. curvicarpus	FABACEAE	SICKLE MILKVETCH	native	
Astragalus deanei (Rydb.) Barneby	FABACEAE	DEAN'S MILKVETCH	native	
Astragalus didymocarpus Hook. & Arn.	FABACEAE	TWO-SEEDED MILKVETCH	native	
Astragalus didymocarpus Hook. & Arn. var. didymocarpus	FABACEAE		native	
Astragalus didymocarpus Hook. & Arn. var. dispermus (A. Gray) Jeps.	FABACEAE		native	
Astragalus didymocarpus Hook. & Arn. var. milesianus (Rydb.) Jeps.	FABACEAE	MILES' MILKVETCH	native	
Astragalus didymocarpus Hook. & Arn. var. obispoensis (Rydb.) Jeps.	FABACEAE		native	
Astragalus douglasii (Torr. & A. Gray) A. Gray	FABACEAE	DOUGLAS MILKVETCH	native	
Astragalus douglasii (Torr. & A. Gray) A. Gray var. douglasii	FABACEAE		native	
Astragalus douglasii (Torr. & A. Gray) A. Gray var. parishii (A. Gray) M. E. Jones	FABACEAE		native	
Astragalus douglasii (Torr. & A. Gray) A. Gray var. perstrictus (Rydb.) Munz & McBurney	FABACEAE	JACUMBA MILKVETCH	native	
Astragalus ertterae Barneby & Shevock	FABACEAE	WALKER PASS MILKVETCH	native	
Astragalus filipes Torr. ex A. Gray	FABACEAE	BASALT MILKVETCH	native	
Astragalus funereus M. E. Jones	FABACEAE	BLACK MILKVETCH	native	
Astragalus gambelianus E. Sheld.	FABACEAE	LITTLE BLUE LOCO	native	
Astragalus geyeri A. Gray	FABACEAE		native	
Astragalus geyeri A. Gray var. geyeri	FABACEAE	GEYER'S MILKVETCH	native	
Astragalus gibbsii Kellogg	FABACEAE	GIBBS' MILKVETCH	native	
Astragalus gilmanii Tidestr.	FABACEAE	GILMAN'S MILKVETCH	native	
Astragalus hornii A. Gray	FABACEAE		native	
Astragalus hornii A. Gray var. hornii	FABACEAE	HORN'S MILKVETCH	native	
Astragalus insularis Kellogg	FABACEAE		native	
Astragalus insularis Kellogg var. harwoodii Munz & McBurney	FABACEAE	HARWOOD'S MILKVETCH	native	
Astragalus inversus M. E. Jones	FABACEAE	SUSANVILLE MILKVETCH	native	
Astragalus inyoensis E. Sheld. ex Coville	FABACEAE	INYO MILKVETCH	native	
Astragalus iodanthus S. Watson	FABACEAE		native	
Astragalus iodanthus S. Watson var. diaphanoides Barneby	FABACEAE	SNAKE MILKVETCH	native	
Astragalus iodanthus S. Watson var. iodanthus	FABACEAE	HUMBOLDT RIVER MILKVETCH	native	
Astragalus jaegerianus Munz	FABACEAE	LANE MOUNTAIN MILKVETCH	native	
Astragalus johannis-howellii Barneby	FABACEAE	LONG VALLEY MILKVETCH	native	
Astragalus kentrophyta A. Gray	FABACEAE		native	
Astragalus kentrophyta A. Gray var. danaus (Barneby) Barneby	FABACEAE	SWEETWATER MOUNTAINS MILKVETCH	native	
Astragalus kentrophyta A. Gray var. elatus S. Watson	FABACEAE	SPINY-LEAVED MILKVETCH	native	
Astragalus kentrophyta A. Gray var. tegetarius (S. Watson) Dorn	FABACEAE		native	
Astragalus kentrophyta A. Gray var. ungulatus M. E. Jones	FABACEAE	SPINY MILKVETCH	native	
Astragalus layneae Greene	FABACEAE	LAYNE MILKVETCH	native	
Astragalus lemmonii A. Gray	FABACEAE	LEMMON'S MILKVETCH	native	
Astragalus lentiformis A. Gray	FABACEAE	LENS-POD MILKVETCH	native	
Astragalus lentiginosus Douglas	FABACEAE	FRECKLED MILKVETCH	native	
Astragalus lentiginosus Douglas var. albifolius M. E. Jones	FABACEAE		native	
Astragalus lentiginosus Douglas var. antonius Barneby	FABACEAE	SAN ANTONIO MILKVETCH	native	
Astragalus lentiginosus Douglas var. borreganus M. E. Jones	FABACEAE	BORREGO MILKVETCH	native	
Astragalus lentiginosus Douglas var. chartaceus M. E. Jones	FABACEAE		native	
Astragalus lentiginosus Douglas var. coachellae Barneby	FABACEAE	COACHELLA VALLEY MILKVETCH	native	
Astragalus lentiginosus Douglas var. floribundus A. Gray	FABACEAE		native	
Astragalus lentiginosus Douglas var. fremontii (A. Gray) S. Watson	FABACEAE	FREMONT'S MILKVETCH	native	
Astragalus lentiginosus Douglas var. idriensis M. E. Jones	FABACEAE		native	
Astragalus lentiginosus Douglas var. ineptus (A. Gray) M. E. Jones	FABACEAE		native	
Astragalus lentiginosus Douglas var. kernensis (Jeps.) Barneby	FABACEAE	KERN PLATEAU MILKVETCH	native	
Astragalus lentiginosus Douglas var. lentiginosus	FABACEAE		native	
Astragalus lentiginosus Douglas var. micans Barneby	FABACEAE	SHINING MILKVETCH	native	
Astragalus lentiginosus Douglas var. nigricalycis M. E. Jones	FABACEAE		native	
Astragalus lentiginosus Douglas var. piscinensis Barneby	FABACEAE	FISH SLOUGH MILKVETCH	native	
Astragalus lentiginosus Douglas var. salinus (Howell) Barneby	FABACEAE		native	
Astragalus lentiginosus Douglas var. semotus Jeps.	FABACEAE		native	
Astragalus lentiginosus Douglas var. sesquimetralis (Rydb.) Barneby	FABACEAE	SODAVILLE MILKVETCH	native	
Astragalus lentiginosus Douglas var. sierrae M. E. Jones	FABACEAE	BIG BEAR VALLEY MILKVETCH	native	
Astragalus lentiginosus Douglas var. variabilis Barneby	FABACEAE		native	
Astragalus leucolobus S. Watson ex M. E. Jones	FABACEAE	BIG BEAR VALLEY WOOLLYPOD	native	
Astragalus macrodon (Hook. & Arn.) A. Gray	FABACEAE	SALINAS MILKVETCH	native	
Astragalus magdalenae Greene	FABACEAE		native	
Astragalus magdalenae Greene var. peirsonii (Munz & J. McBurney) Barneby	FABACEAE	PEIRSON'S MILKVETCH	native	
Astragalus malacus A. Gray	FABACEAE		native	
Astragalus miguelensis Greene	FABACEAE	SAN MIGUEL ISLAND MILKVETCH	native	
Astragalus minthorniae (Rydb.) Jeps.	FABACEAE		native	
Astragalus minthorniae (Rydb.) Jeps. var. villosus Barneby	FABACEAE		native	
Astragalus mohavensis S. Watson	FABACEAE		native	
Astragalus mohavensis S. Watson var. hemigyrus (Clokey) Barneby	FABACEAE	CURVED-POD MILKVETCH	native	
Astragalus mohavensis S. Watson var. mohavensis	FABACEAE		native	
Astragalus monoensis Barneby	FABACEAE	MONO MILKVETCH	native	
Astragalus nevinii A. Gray	FABACEAE	SAN CLEMENTE ISLAND MILKVETCH	native	
Astragalus newberryi A. Gray	FABACEAE		native	
Astragalus newberryi A. Gray var. newberryi	FABACEAE	NEWBERRY'S MILKVETCH	native	
Astragalus nutans M. E. Jones	FABACEAE	PROVIDENCE MOUNTAINS MILKVETCH	native	
Astragalus nuttallianus DC.	FABACEAE	SMALL-FLOWERED MILKVETCH	native	
Astragalus nuttallianus DC. var. cedrosensis M. E. Jones	FABACEAE		native	
Astragalus nuttallianus DC. var. imperfectus (Rydb.) Barneby	FABACEAE		native	
Astragalus nuttallii (Torr. & A. Gray) J. T. Howell	FABACEAE	NUTTALL'S MILKVETCH	native	
Astragalus nuttallii (Torr. & A. Gray) J. T. Howell var. nuttallii	FABACEAE	OCEAN BLUFF MILKVETCH	native	
Astragalus nuttallii (Torr. & A. Gray) J. T. Howell var. virgatus (A. Gray) Barneby	FABACEAE		native	
Astragalus obscurus S. Watson	FABACEAE		native	
Astragalus oocarpus A. Gray	FABACEAE	SAN DIEGO MILKVETCH	native	
Astragalus oophorus S. Watson	FABACEAE		native	
Astragalus oophorus S. Watson var. lavinii Barneby	FABACEAE	LAVIN'S MILKVETCH	native	
Astragalus oophorus S. Watson var. oophorus	FABACEAE	EGG MILKVETCH	native	
Astragalus oxyphysus A. Gray	FABACEAE	STANISLAUS MILKVETCH	native	
Astragalus pachypus Greene	FABACEAE		native	
Astragalus pachypus Greene var. jaegeri Munz & McBurney	FABACEAE	JAEGER'S BUSH MILKVETCH	native	
Astragalus pachypus Greene var. pachypus	FABACEAE	BUSH MILKVETCH	native	
Astragalus palmeri A. Gray	FABACEAE		native	
Astragalus panamintensis E. Sheld.	FABACEAE		native	
Astragalus pauperculus Greene	FABACEAE	DEPAUPERATE MILKVETCH	native	
Astragalus platytropis A. Gray	FABACEAE	BROAD-KEELED MILKVETCH	native	
Astragalus pomonensis M. E. Jones	FABACEAE		native	
Astragalus preussii A. Gray	FABACEAE		native	
Astragalus preussii A. Gray var. laxiflorus A. Gray	FABACEAE	LANCASTER MILKVETCH	native	
Astragalus preussii A. Gray var. preussii	FABACEAE	PREUSS' MILKVETCH	native	
Astragalus pseudiodanthus Barneby	FABACEAE	TONOPAH MILKVETCH	native	
Astragalus pulsiferae A. Gray	FABACEAE		native	
Astragalus pulsiferae A. Gray var. coronensis S. L. Welsh, Ondricek, & G. Clifton	FABACEAE	MODOC PLATEAU MILKVETCH	native	
Astragalus pulsiferae A. Gray var. pulsiferae	FABACEAE	PULSIFER'S MILKVETCH	native	
Astragalus pulsiferae A. Gray var. suksdorfii (Howell) Barneby	FABACEAE	SUKSDORF'S MILKVETCH	native	
Astragalus purshii Douglas	FABACEAE	PURSH'S MILKVETCH	native	
Astragalus purshii Douglas var. lagopinus (Rydb.) Barneby	FABACEAE		native	
Astragalus purshii Douglas var. lectulus (S. Watson) M. E. Jones	FABACEAE		native	
Astragalus purshii Douglas var. purshii	FABACEAE		native	
Astragalus purshii Douglas var. tinctus M. E. Jones	FABACEAE		native	
Astragalus pycnostachyus A. Gray	FABACEAE		native	
Astragalus pycnostachyus A. Gray var. lanosissimus (Rydb.) Munz & McBurney	FABACEAE	VENTURA MARSH MILKVETCH	native	
Astragalus pycnostachyus A. Gray var. pycnostachyus	FABACEAE	COASTAL MARSH MILKVETCH	native	
Astragalus rattanii A. Gray	FABACEAE		native	
Astragalus rattanii A. Gray var. jepsonianus Barneby	FABACEAE	JEPSON'S MILKVETCH	native	
Astragalus rattanii A. Gray var. rattanii	FABACEAE	RATTAN'S MILKVETCH	native	
Astragalus ravenii Barneby	FABACEAE	RAVEN'S MILKVETCH	native	
Astragalus sabulonum A. Gray	FABACEAE		native	
Astragalus sepultipes (Barneby) Barneby	FABACEAE	BISHOP MILKVETCH	native	
Astragalus serenoi (Kuntze) E. Sheld.	FABACEAE		native	
Astragalus serenoi (Kuntze) E. Sheld. var. shockleyi (M. E. Jones) Barneby	FABACEAE	SHOCKLEY'S MILKVETCH	native	
Astragalus shevockii Barneby	FABACEAE	SHEVOCK'S MILKVETCH	native	
Astragalus subvestitus (Jeps.) Barneby	FABACEAE	KERN COUNTY MILKVETCH	native	
Astragalus tener A. Gray	FABACEAE		native	
Astragalus tener A. Gray var. ferrisiae Liston	FABACEAE	FERRIS' MILKVETCH	native	
Astragalus tener A. Gray var. tener	FABACEAE	ALKALI MILKVETCH	native	
Astragalus tener A. Gray var. titi (Eastw.) Barneby	FABACEAE	COASTAL DUNES MILKVETCH	native	
Astragalus tidestromii (Rydb.) Clokey	FABACEAE	TIDESTROM'S MILKVETCH	native	
Astragalus traskiae Eastw.	FABACEAE	TRASK'S MILKVETCH	native	
Astragalus tricarinatus A. Gray	FABACEAE	TRIPLE-RIBBED MILKVETCH	native	
Astragalus trichopodus (Nutt.) A. Gray	FABACEAE		native	
Astragalus trichopodus (Nutt.) A. Gray var. lonchus (M. E. Jones) Barneby	FABACEAE		native	
Astragalus trichopodus (Nutt.) A. Gray var. phoxus (M. E. Jones) Barneby	FABACEAE	ANTISELL MILKVETCH	native	
Astragalus trichopodus (Nutt.) A. Gray var. trichopodus	FABACEAE	SANTA BARBARA MILKVETCH	native	
Astragalus umbraticus E. Sheld.	FABACEAE	BALD MOUNTAIN MILKVETCH	native	
Astragalus webberi A. Gray	FABACEAE	WEBBER'S MILKVETCH	native	
Astragalus whitneyi A. Gray	FABACEAE	BALLOON MILKVETCH	native	
Astragalus whitneyi A. Gray var. confusus Barneby	FABACEAE		native	
Astragalus whitneyi A. Gray var. lenophyllus (Rydb.) Barneby	FABACEAE	WOOLLY-LEAVED MILKVETCH	native	
Astragalus whitneyi A. Gray var. siskiyouensis (Rydb.) Barneby	FABACEAE		native	
Astragalus whitneyi A. Gray var. whitneyi	FABACEAE		native	
Astrolepis cochisensis (Goodd.) D.M. Benham & Windham	PTERIDACEAE	SCALY CLOAK-FERN	native	
Astrolepis cochisensis (Goodd.) D.M. Benham & Windham subsp. cochisensis	PTERIDACEAE		native	
Asyneuma prenanthoides (Durand) McVaugh	CAMPANULACEAE		native	
Athyrium distentifolium Opiz	WOODSIACEAE		native	
Athyrium distentifolium Opiz var. americanum (Butters) Cronquist	WOODSIACEAE		native	
Athyrium filix-femina (L.) Roth	WOODSIACEAE		native	
Athyrium filix-femina (L.) Roth var. cyclosorum Rupr.	WOODSIACEAE		native	
Athysanus pusillus (Hook.) Greene	BRASSICACEAE		native	
Athysanus unilateralis (M. E. Jones) Jeps.	BRASSICACEAE		native	
Atrichoseris platyphylla (A. Gray) A. Gray	ASTERACEAE		native	
Atriplex amnicola Paul G. Wilson	CHENOPODIACEAE	SWAMP SALTBUSH	naturalized	
Atriplex argentea Nutt.	CHENOPODIACEAE	SILVERSCALE	native	
Atriplex argentea Nutt. var. argentea	CHENOPODIACEAE		native	
Atriplex argentea Nutt. var. expansa (S. Watson) S.L. Welsh & Reveal	CHENOPODIACEAE		native	
Atriplex argentea Nutt. var. hillmanii M. E. Jones	CHENOPODIACEAE	HILLMAN'S SILVERSCALE	native	
Atriplex argentea Nutt. var. longitrichoma (Stutz & G.L. Chu & S.C. Sand.) S.L. Welsh	CHENOPODIACEAE	PAHRUMP ORACH	native	
Atriplex canescens (Pursh) Nutt.	CHENOPODIACEAE	FOUR-WING SALTBUSH	native	
Atriplex canescens (Pursh) Nutt. var. canescens	CHENOPODIACEAE		native	
Atriplex canescens (Pursh) Nutt. var. laciniata Parish	CHENOPODIACEAE	CALEB SALTBUSH	native	
Atriplex canescens (Pursh) Nutt. var. linearis (S. Watson) Munz	CHENOPODIACEAE	SLENDERLEAF SALTBUSH	native	
Atriplex canescens (Pursh) Nutt. var. macilenta Jeps.	CHENOPODIACEAE	SALTON SALTBUSH	native	
Atriplex confertifolia (Torr. & Frém.) S. Watson	CHENOPODIACEAE	SHADSCALE	native	
Atriplex cordulata Jeps.	CHENOPODIACEAE	HEARTSCALE	native	
Atriplex cordulata Jeps. var. cordulata	CHENOPODIACEAE		native	
Atriplex cordulata Jeps. var. erecticaulis (Stutz, G. L.Chu, & S. C.Sand.) S. L. Welsh	CHENOPODIACEAE	EARLIMART ORACH	native	
Atriplex coronata S. Watson	CHENOPODIACEAE		native	
Atriplex coronata S. Watson var. coronata	CHENOPODIACEAE	CROWNSCALE	native	
Atriplex coronata S. Watson var. notatior Jeps.	CHENOPODIACEAE	SAN JACINTO VALLEY CROWNSCALE	native	
Atriplex coronata S. Watson var. vallicola (Hoover) S. L.Welsh	CHENOPODIACEAE	LOST HILLS CROWNSCALE	native	
Atriplex coulteri (Moq.) D. Dietr.	CHENOPODIACEAE	COULTER'S SALTBUSH	native	
Atriplex depressa Jeps.	CHENOPODIACEAE	BRITTLESCALE	native	
Atriplex dioica Raf.	CHENOPODIACEAE	THICKLEAF ORACH	native	
Atriplex elegans (Moq.) D. Dietr.	CHENOPODIACEAE	WHEELSCALE	native	
Atriplex elegans (Moq.) D. Dietr. var. elegans	CHENOPODIACEAE		native	
Atriplex elegans (Moq.) D. Dietr. var. fasciculata (S. Watson) M. E. Jones	CHENOPODIACEAE	MECCA ORACH	native	
Atriplex fruticulosa Jeps.	CHENOPODIACEAE	LITTLE OAK ORACH	native	
Atriplex gardneri (Moq.) D. Dietr.	CHENOPODIACEAE		native	
Atriplex gardneri (Moq.) D. Dietr. var. falcata (M. E. Jones) S. L. Welsh	CHENOPODIACEAE	FALCATE SALTBUSH	native	
Atriplex glauca L.	CHENOPODIACEAE		naturalized	
Atriplex gmelinii C. A. Mey. ex Bong.	CHENOPODIACEAE		native	
Atriplex gmelinii C. A. Mey. ex Bong. var. gmelinii	CHENOPODIACEAE	GMELIN'S SALTBUSH	native	
Atriplex hortensis L.	CHENOPODIACEAE	GARDEN ORACH	naturalized	
Atriplex hymenelytra (Torr.) S. Watson	CHENOPODIACEAE	DESERT-HOLLY	native	
Atriplex lentiformis (Torr.) S. Watson	CHENOPODIACEAE	BIG SALTBUSH	native	
Atriplex leucophylla (Moq.) D. Dietr.	CHENOPODIACEAE	BEACH SALTBUSH	native	
Atriplex lindleyi Moq.	CHENOPODIACEAE		naturalized	
Atriplex micrantha Ledeb.	CHENOPODIACEAE	RUSSIAN ATRIPLEX	naturalized	
Atriplex minuscula Standl.	CHENOPODIACEAE	LESSER SALTSCALE	native	
Atriplex nummularia Lindl.	CHENOPODIACEAE		naturalized	
Atriplex pacifica A. Nelson	CHENOPODIACEAE	SOUTH COAST SALTSCALE	native	
Atriplex parishii S. Watson	CHENOPODIACEAE	PARISH'S BRITTLESCALE	native	
Atriplex parryi S. Watson	CHENOPODIACEAE		native	
Atriplex patula L.	CHENOPODIACEAE	SPEAR ORACH	native	
Atriplex persistens Stutz & G. L. Chu	CHENOPODIACEAE	VERNAL POOL SMALLSCALE	native	
Atriplex polycarpa (Torr.) S. Watson	CHENOPODIACEAE	ALLSCALE SALTBUSH	native	
Atriplex prostrata Boucher ex DC.	CHENOPODIACEAE	FAT-HEN	naturalized	
Atriplex pusilla (Torr. ex S. Watson) S. Watson	CHENOPODIACEAE	SMOOTH SALTBUSH	native	
Atriplex rosea L.	CHENOPODIACEAE	TUMBLING ORACH	naturalized	
Atriplex semibaccata R. Br.	CHENOPODIACEAE	AUSTRALIAN SALTBUSH	naturalized	
Atriplex serenana A. Nelson ex Abrams	CHENOPODIACEAE	STINKING ORACH	native	
Atriplex serenana A. Nelson ex Abrams var. davidsonii (Standl.) Munz	CHENOPODIACEAE	DAVIDSON'S SALTSCALE	native	
Atriplex serenana A. Nelson ex Abrams var. serenana	CHENOPODIACEAE		native	
Atriplex spinifera J. F. Macbr.	CHENOPODIACEAE	SPINY SALTBUSH	native	
Atriplex suberecta I. Verd.	CHENOPODIACEAE	SPRAWLING SALTBUSH	naturalized	
Atriplex subtilis Stutz & G. L. Chu	CHENOPODIACEAE	SUBTLE ORACH	native	
Atriplex torreyi (S. Watson) S. Watson	CHENOPODIACEAE		native	
Atriplex torreyi (S. Watson) S. Watson var. torreyi	CHENOPODIACEAE	TORREY'S SALTBUSH	native	
Atriplex truncata (Torr. ex S. Watson) A. Gray	CHENOPODIACEAE	WEDGESCALE	native	
Atriplex tularensis Coville	CHENOPODIACEAE	BAKERSFIELD SMALLSCALE	native	
Atriplex watsonii A. Nelson ex Abrams	CHENOPODIACEAE		native	
Avena barbata Pott ex Link	POACEAE	SLENDER WILD OAT	naturalized	
Avena fatua L.	POACEAE	WILD OAT	naturalized	
Avena sativa L.	POACEAE	CULTIVATED OAT	naturalized	
Avena sterilis L.	POACEAE	ANIMATED OAT	naturalized	
Avicennia marina (Forssk.) Vierh.	ACANTHACEAE		naturalized	
Avicennia marina (Forssk.) Vierh. var. australasica (Walp.) Moldenke	ACANTHACEAE	GRAY MANGROVE	naturalized	
Ayenia compacta Rose	MALVACEAE	CALIFORNIA AYENIA	native	
Azolla filiculoides Lam.	AZOLLACEAE		native	
Azolla microphylla Kaulf.	AZOLLACEAE	MEXICAN MOSQUITO FERN	native	
Baccharis brachyphylla A. Gray	ASTERACEAE		native	
Baccharis glutinosa Pers.	ASTERACEAE	MARSH BACCHARIS	native	
Baccharis malibuensis R. M. Beauch. & Henr.	ASTERACEAE	MALIBU BACCHARIS	native	
Baccharis pilularis DC.	ASTERACEAE	COYOTE BRUSH	native	
Baccharis pilularis DC. subsp. consanguinea (DC.) C. B. Wolf	ASTERACEAE		native	
Baccharis pilularis DC. subsp. pilularis	ASTERACEAE		native	
Baccharis plummerae A. Gray	ASTERACEAE		native	
Baccharis plummerae A. Gray subsp. glabrata Hoover	ASTERACEAE	SAN SIMEON BACCHARIS	native	
Baccharis plummerae A. Gray subsp. plummerae	ASTERACEAE	PLUMMER'S BACCHARIS	native	
Baccharis salicifolia (Ruiz & Pav.) Pers.	ASTERACEAE		native	
Baccharis salicifolia (Ruiz & Pav.) Pers. subsp. salicifolia	ASTERACEAE	MULE FAT	native	
Baccharis salicina Torr. & A. Gray	ASTERACEAE		native	
Baccharis sarothroides A. Gray	ASTERACEAE	BROOM BACCHARIS	native	
Baccharis sergiloides A. Gray	ASTERACEAE	DESERT BACCHARIS	native	
Baccharis vanessae R. M. Beauch.	ASTERACEAE	ENCINITAS BACCHARIS	native	
Bacopa eisenii (Kellogg) Pennell	PLANTAGINACEAE		native	
Bacopa monnieri (L.) Wettst.	PLANTAGINACEAE		naturalized	
Bacopa rotundifolia (Michx.) Wettst.	PLANTAGINACEAE		naturalized	
Bahia neomexicana (A. Gray) A. Gray	ASTERACEAE		native	
Bahiopsis laciniata (A. Gray) E. E. Schilling & Panero	ASTERACEAE	SAN DIEGO VIGUIERA	native	
Bahiopsis parishii (Greene) E. E. Schill. & Panero	ASTERACEAE	PARISH'S GOLDENEYE	native	
Bahiopsis reticulata (S. Watson) E. E. Schill. & Panero	ASTERACEAE	DEATH VALLEY GOLDENEYE	native	
Baileya multiradiata Harv. & A. Gray ex Torr.	ASTERACEAE		native	
Baileya pauciradiata A. Gray	ASTERACEAE		native	
Baileya pleniradiata A. Gray	ASTERACEAE		native	
Balsamorhiza deltoidea Nutt.	ASTERACEAE		native	
Balsamorhiza hirsuta Nutt.	ASTERACEAE		native	
Balsamorhiza hookeri Nutt.	ASTERACEAE		native	
Balsamorhiza macrolepis W. M. Sharp	ASTERACEAE		native	
Balsamorhiza sagittata (Pursh) Nutt.	ASTERACEAE		native	
Balsamorhiza sericea W. A. Weber	ASTERACEAE	SILKY BALSAMROOT	native	
Balsamorhiza serrata A. Nelson & J. F. Macbr.	ASTERACEAE	SERRATED BALSAMROOT	native	
Barbarea orthoceras Ledeb.	BRASSICACEAE		native	
Barbarea verna (Mill.) Asch.	BRASSICACEAE	EARLY WINTER CRESS	naturalized	
Barbarea vulgaris W. T. Aiton	BRASSICACEAE	YELLOW ROCKET	naturalized	
Bassia hyssopifolia (Pall.) Kuntze	CHENOPODIACEAE		naturalized	
Batis maritima L.	BATACEAE	BEACHWORT	native	
Bebbia juncea (Benth.) Greene	ASTERACEAE		native	
Bebbia juncea (Benth.) Greene var. aspera Greene	ASTERACEAE		native	
Beckmannia syzigachne (Steud.) Fernald	POACEAE	AMERICAN SLOUGH GRASS	native	
Bellardia trixago (L.) All.	OROBANCHACEAE	MEDITERRANEAN LINSEED	naturalized	
Bellis perennis L.	ASTERACEAE	ENGLISH DAISY	naturalized	
Benitoa occidentalis (H. M. Hall) D. D. Keck	ASTERACEAE		native	
Bensoniella oregona (Abrams & Bacig.) C. V. Morton	SAXIFRAGACEAE	BENSONIELLA	native	
Berberis aquifolium Pursh	BERBERIDACEAE		native	
Berberis aquifolium Pursh var. aquifolium	BERBERIDACEAE		native	
Berberis aquifolium Pursh var. dictyota (Jeps.) Jeps.	BERBERIDACEAE		native	
Berberis aquifolium Pursh var. repens (Lindl.) Scoggan	BERBERIDACEAE		native	
Berberis darwinii Hook.	BERBERIDACEAE		naturalized	
Berberis fremontii Torr.	BERBERIDACEAE		native	
Berberis haematocarpa Wooton	BERBERIDACEAE		native	
Berberis harrisoniana Kearney & Peebles	BERBERIDACEAE	KOFA MOUNTAIN BARBERRY	native	
Berberis higginsiae Munz	BERBERIDACEAE		native	
Berberis nervosa Pursh	BERBERIDACEAE		native	
Berberis nevinii A. Gray	BERBERIDACEAE	NEVIN'S BARBERRY	native	
Berberis pinnata Lag.	BERBERIDACEAE		native	
Berberis pinnata Lag. subsp. insularis Munz	BERBERIDACEAE	ISLAND BARBERRY	native	
Berberis pinnata Lag. subsp. pinnata	BERBERIDACEAE		native	
Berberis vulgaris L.	BERBERIDACEAE		naturalized	
Bergerocactus emoryi (Engelm.) Britton & Rose	CACTACEAE	GOLDEN-SPINED CEREUS	native	
Bergia texana (Hook.) Seub. ex Walp.	ELATINACEAE		native	
Bernardia incana C. V. Morton	EUPHORBIACEAE		native	
Berteroa incana (L.) DC.	BRASSICACEAE		naturalized	
Berula erecta (Huds.) Coville	APIACEAE		native	
Beta vulgaris L.	CHENOPODIACEAE		naturalized	
Beta vulgaris L. subsp. maritima (L.) Arcang.	CHENOPODIACEAE	SEA BEET	naturalized	
Betula glandulosa Michx.	BETULACEAE	DWARF RESIN BIRCH	native	
Betula occidentalis Hook.	BETULACEAE	WATER BIRCH	native	
Bidens cernua L.	ASTERACEAE	NODDING BUR-MARIGOLD	native	
Bidens frondosa L.	ASTERACEAE	STICKTIGHT	native	
Bidens laevis (L.) Britton, Sterns & Poggenb.	ASTERACEAE	BUR-MARIGOLD	native	
Bidens pilosa L.	ASTERACEAE	COMMON BEGGAR-TICKS	naturalized	
Bidens tripartita L.	ASTERACEAE		naturalized	
Bidens vulgata Greene	ASTERACEAE		naturalized	
Billardiera heterophylla (Lindl.) L.W.Cayzer & Crisp	PITTOSPORACEAE	AUSTRALIAN BLUEBELL	naturalized	
Bistorta bistortoides (Pursh) Small	POLYGONACEAE	WESTERN BISTORT	native	
Bituminaria bituminosa (L.) C. H. Stirt.	FABACEAE	ARABIAN PEA	naturalized	
Blechnum spicant (L.) Roth	BLECHNACEAE	DEER FERN	native	
Blennosperma bakeri Heiser	ASTERACEAE	SONOMA SUNSHINE	native	
Blennosperma nanum (Hook.) S. F. Blake	ASTERACEAE		native	
Blennosperma nanum (Hook.) S. F. Blake var. nanum	ASTERACEAE		native	
Blennosperma nanum (Hook.) S. F. Blake var. robustum J. T. Howell	ASTERACEAE	POINT REYES BLENNOSPERMA	native	
Blepharidachne kingii (S. Watson) Hack.	POACEAE	KING'S EYELASH GRASS	native	
Blepharipappus scaber Hook.	ASTERACEAE		native	
Blepharizonia laxa Greene	ASTERACEAE		native	
Blepharizonia plumosa (Kellogg) Greene	ASTERACEAE	BIG TARPLANT	native	
Bloomeria clevelandii S. Watson	THEMIDACEAE	SAN DIEGO GOLDENSTAR	native	
Bloomeria crocea (Torr.) Coville	THEMIDACEAE	COMMON GOLDENSTAR	native	
Bloomeria crocea (Torr.) Coville var. aurea (Kellogg) J. W. Ingram	THEMIDACEAE		native	
Bloomeria crocea (Torr.) Coville var. crocea	THEMIDACEAE		native	
Bloomeria crocea (Torr.) Coville var. montana (Greene) J. W. Ingram	THEMIDACEAE	MOUNTAIN GOLDENSTAR	native	
Bloomeria humilis Hoover	THEMIDACEAE	DWARF GOLDENSTAR	native	
Boechera acutina (Greene) Windham & Al-Shehbaz	BRASSICACEAE	POINTED ROCKCRESS	native	
Boechera arcuata (Nutt.) Windham & Al-Shehbaz	BRASSICACEAE	ARCHING ROCKCRESS	native	
Boechera bodiensis (Rollins) Al-Shehbaz	BRASSICACEAE	BODIE HILLS ROCKCRESS	native	
Boechera breweri (S. Watson) Al-Shehbaz	BRASSICACEAE		native	
Boechera breweri subsp. breweri (S. Watson) Al-Shehbaz	BRASSICACEAE	BREWER'S ROCKCRESS	native	
Boechera breweri subsp. shastaensis Windham & Al-Shehbaz	BRASSICACEAE	SHASTA ROCKCRESS	native	
Boechera calderi (G.A. Mulligan) Windham & Al-Shehbaz	BRASSICACEAE	CALDER'S ROCKCRESS	native	
Boechera californica (Rollins) Windham & Al-Shehbaz	BRASSICACEAE	CALIFORNIA ROCKCRESS	native	
Boechera cobrensis (M.E. Jones) Dorn	BRASSICACEAE	MASONIC ROCKCRESS	native	
Boechera constancei (Rollins) Al-Shehbaz	BRASSICACEAE	CONSTANCE'S ROCKCRESS	native	
Boechera covillei (Greene) Windham & Al-Shehbaz	BRASSICACEAE	COVILLE'S ROCKCRESS	native	
Boechera davidsonii (Greene) N.H. Holmgren	BRASSICACEAE	DAVIDSON'S ROCKCRESS	native	
Boechera depauperata (A. Nelson & P.B. Kenn.) Windham & Al-Shehbaz	BRASSICACEAE	SOLDIER ROCKCRESS	native	
Boechera dispar (M.E. Jones) Al-Shehbaz	BRASSICACEAE	PINYON ROCKCRESS	native	
Boechera divaricarpa (A. Nelson) Á. Löve & D. Löve	BRASSICACEAE	SPREADINGPOD ROCKCRESS	native	
Boechera elkoensis Windham & Al-Shehbaz	BRASSICACEAE	ELKO ROCKCRESS	native	
Boechera evadens Windham & Al-Shehbaz	BRASSICACEAE	HIDDEN ROCKCRESS	native	
Boechera glaucovalvula (M.E. Jones) Al-Shehbaz	BRASSICACEAE	BLUEPOD ROCKCRESS	native	
Boechera hoffmannii (Munz) Al-Shehbaz	BRASSICACEAE	HOFFMANN'S ROCKCRESS	native	
Boechera howellii (S. Watson) Windham & Al-Shehbaz	BRASSICACEAE	HOWELL'S ROCKCRESS	native	
Boechera inyoensis (Rollins) Al-Shehbaz	BRASSICACEAE	INYO ROCKCRESS	native	
Boechera johnstonii (Munz) Al-Shehbaz	BRASSICACEAE	JOHNSTON'S ROCKCRESS	native	
Boechera koehleri (Howell) Al-Shehbaz	BRASSICACEAE	KOEHLER'S ROCKCRESS	native	
Boechera lemmonii (S. Watson) W.A. Weber	BRASSICACEAE	LEMMON'S ROCKCRESS	native	
Boechera lincolnensis Windham & Al-Shehbaz	BRASSICACEAE	LINCOLN ROCKCRESS	native	
Boechera lyallii (S. Watson) Dorn	BRASSICACEAE	LYALL'S ROCKCRESS	native	
Boechera parishii (S. Watson) Al-Shehbaz	BRASSICACEAE	PARISH'S ROCKCRESS	native	
Boechera pauciflora (Nutt.) Windham & Al-Shehbaz	BRASSICACEAE	HAIRY STEM ROCKCRESS	native	
Boechera paupercula (Greene) Windham & Al-Shehbaz	BRASSICACEAE	SMALL-FLOWERED ROCKCRESS	native	
Boechera peirsonii Windham & Al-Shehbaz	BRASSICACEAE	PEIRSON'S ROCKCRESS	native	
Boechera pendulina (Greene) W.A. Weber	BRASSICACEAE	RABBIT-EAR ROCKCRESS	native	
Boechera pendulocarpa (A. Nelson) Windham & Al-Shehbaz	BRASSICACEAE	DROPSEED ROCKCRESS	native	
Boechera perennans (S. Watson) W.A. Weber	BRASSICACEAE	PERENNIAL ROCKCRESS	native	
Boechera pinetorum (Tidestr.) Windham & Al-Shehbaz	BRASSICACEAE	WOODLAND ROCKCRESS	native	
Boechera pinzliae (Rollins) Al-Shehbaz	BRASSICACEAE	PINZL'S ROCKCRESS	native	
Boechera platysperma (A. Gray) Al-Shehbaz	BRASSICACEAE	PIONEER ROCKCRESS	native	
Boechera pratincola (Greene) Windham & Al-Shehbaz	BRASSICACEAE	MEADOW ROCKCRESS	native	
Boechera puberula (Nutt.) Dorn	BRASSICACEAE	SILVER ROCKCRESS	native	
Boechera pulchra (M.E. Jones ex S. Watson) W.A. Weber	BRASSICACEAE	BEAUTIFUL ROCKCRESS	native	
Boechera pygmaea (Rollins) Al-Shehbaz	BRASSICACEAE	TULARE COUNTY ROCKCRESS	native	
Boechera rectissima (Greene) Al-Shehbaz	BRASSICACEAE	BRISTLY LEAF ROCKCRESS	native	
Boechera repanda (S. Watson) Al-Shehbaz	BRASSICACEAE	YOSEMITE ROCKCRESS	native	
Boechera retrofracta (Graham) Á. Löve & D. Löve	BRASSICACEAE	REFLEXED ROCKCRESS	native	
Boechera rigidissima (Rollins) Al-Shehbaz	BRASSICACEAE	TRINITY MOUNTAIN ROCKCRESS	native	
Boechera rollei (Rollins) Al-Shehbaz	BRASSICACEAE	ROLLE'S ROCKCRESS	native	
Boechera rubicundula (Jeps.) Windham & Al-Shehbaz	BRASSICACEAE	MOUNT DAY ROCKCRESS	native	
Boechera serpenticola Windham & Al-Shehbaz	BRASSICACEAE	SERPENTINE ROCKCRESS	native	
Boechera shevockii Windham & Al-Shehbaz	BRASSICACEAE	SHEVOCK'S ROCKCRESS	native	
Boechera shockleyi (Munz) Dorn	BRASSICACEAE	SHOCKLEY'S ROCKCRESS	native	
Boechera sparsiflora (Nutt.) Dorn	BRASSICACEAE	SICKLEPOD ROCKCRESS	native	
Boechera stricta (Graham) Al-Shehbaz	BRASSICACEAE	DRUMMOND'S ROCKCRESS	native	
Boechera subpinnatifida (S. Watson) Al-Shehbaz	BRASSICACEAE	KLAMATH ROCKCRESS	native	
Boechera suffrutescens (S. Watson) Dorn	BRASSICACEAE	WOODY ROCKCRESS	native	
Boechera tiehmii (Rollins) Al-Shehbaz	BRASSICACEAE	TIEHM'S ROCKCRESS	native	
Boechera tularensis Windham & Al-Shehbaz	BRASSICACEAE	TULARE ROCKCRESS	native	
Boechera ultraalsa Windham & Al-Shehbaz	BRASSICACEAE	SNOW MOUNTAIN ROCKCRESS	native	
Boechera xylopoda Windham & Al-Shehbaz	BRASSICACEAE	BIGFOOT HYBRID ROCKCRESS	native	
Boechera yorkii S. Boyd	BRASSICACEAE	LAST CHANCE ROCKCRESS	native	
Boehmeria cylindrica (L.) Sw.	URTICACEAE		naturalized	
Boerhavia coccinea Mill.	NYCTAGINACEAE	SCARLET SPIDERLING	native	
Boerhavia coulteri (Hook. f.) S. Watson	NYCTAGINACEAE		native	
Boerhavia coulteri (Hook.f.) S. Watson var. palmeri (S.Watson) Spellenb.	NYCTAGINACEAE		native	
Boerhavia diffusa L.	NYCTAGINACEAE		naturalized	
Boerhavia triquetra S. Watson	NYCTAGINACEAE		native	
Boerhavia triquetra S. Watson var. intermedia (M. E. Jones) Spellenb.	NYCTAGINACEAE		native	
Boerhavia wrightii A. Gray	NYCTAGINACEAE		native	
Bolandra californica A. Gray	SAXIFRAGACEAE	SIERRA BOLANDRA	native	
Bolboschoenus fluviatilis (Torr.) Soják	CYPERACEAE	RIVER BULRUSH	native	
Bolboschoenus glaucus (Lam.) S. G. Sm.	CYPERACEAE		naturalized	
Bolboschoenus maritimus (L.) Palla	CYPERACEAE		native	
Bolboschoenus maritimus (L.) Palla subsp. paludosus (A. Nelson) T. Koyama	CYPERACEAE	ALKALI BULRUSH	native	
Bolboschoenus robustus (Pursh) Soják	CYPERACEAE	SEACOAST BULRUSH	native	
Borago officinalis L.	BORAGINACEAE		naturalized	
Bothriochloa barbinodis (Lag.) Herter	POACEAE	CANE BLUESTEM	native	
Bothriochloa laguroides (DC.) Herter	POACEAE		naturalized	
Bothriochloa laguroides (DC.) Herter subsp. torreyana (Steud.) Allred & Gould	POACEAE	SILVER BLUESTEM	naturalized	
Botrychium ascendens W. H. Wagner	OPHIOGLOSSACEAE	UPSWEPT MOONWORT	native	
Botrychium crenulatum W. H. Wagner	OPHIOGLOSSACEAE	SCALLOPED MOONWORT	native	
Botrychium lineare W. H. Wagner	OPHIOGLOSSACEAE	SLENDER MOONWORT	native	
Botrychium lunaria (L.) Sw.	OPHIOGLOSSACEAE	COMMON MOONWORT	native	
Botrychium minganense Vict.	OPHIOGLOSSACEAE	MINGAN MOONWORT	native	
Botrychium montanum W. H. Wagner	OPHIOGLOSSACEAE	WESTERN GOBLIN	native	
Botrychium paradoxum W.H. Wagner	OPHIOGLOSSACEAE	PARADOX MOONWORT	native	
Botrychium pinnatum H. St. John	OPHIOGLOSSACEAE	NORTHWESTERN MOONWORT	native	
Botrychium pumicola Coville ex Underw.	OPHIOGLOSSACEAE	PUMICE MOONWORT	native	
Botrychium simplex E. Hitchc.	OPHIOGLOSSACEAE		native	
Botrychium simplex E. Hitchc. var. compositum (Lasch) Milde	OPHIOGLOSSACEAE	YOSEMITE MOONWORT	native	
Botrychium tunux Stensvold & Farrar	OPHIOGLOSSACEAE	MOOSEWORT	native	
Botrychium yaaxudakeit Stensvold & Farrar	OPHIOGLOSSACEAE	GIANT MOONWORT	native	
Botrypus virginianus (L.) Michx.	OPHIOGLOSSACEAE		native	
Bouteloua aristidoides (Kunth) Griseb.	POACEAE		native	
Bouteloua aristidoides (Kunth) Griseb. var. aristidoides	POACEAE	NEEDLE GRAMA	native	
Bouteloua barbata Lag.	POACEAE		native	
Bouteloua barbata Lag. var. barbata	POACEAE	SIXWEEKS GRAMA	native	
Bouteloua curtipendula (Michx.) Torr.	POACEAE	SIDE-OATS GRAMA	native	
Bouteloua eriopoda (Torr.) Torr.	POACEAE	BLACK GRAMA	native	
Bouteloua gracilis (Kunth) Lag. ex Griffiths	POACEAE	BLUE GRAMA	native	
Bouteloua trifida S. Watson	POACEAE	THREE-AWNED GRAMA	native	
Bowlesia incana Ruiz & Pav.	APIACEAE		native	
Boykinia major A. Gray	SAXIFRAGACEAE		native	
Boykinia occidentalis Torr. & A. Gray	SAXIFRAGACEAE		native	
Boykinia rotundifolia Parry ex A. Gray	SAXIFRAGACEAE		native	
Brachypodium distachyon (L.) P. Beauv.	POACEAE		naturalized	
Brachypodium sylvaticum (Huds.) P. Beauv.	POACEAE		naturalized	
Brandegea bigelovii (S. Watson) Cogn.	CUCURBITACEAE		native	
Brasenia schreberi J. F. Gmel.	CABOMBACEAE		native	
Brassica fruticulosa Cirillo	BRASSICACEAE		naturalized	
Brassica juncea (L.) Czern.	BRASSICACEAE	INDIA MUSTARD	naturalized	
Brassica napus L.	BRASSICACEAE	RAPESEED	naturalized	
Brassica nigra (L.) W. D. J. Koch	BRASSICACEAE	BLACK MUSTARD	naturalized	
Brassica oleracea L.	BRASSICACEAE	CABBAGE	naturalized	
Brassica rapa L.	BRASSICACEAE	FIELD MUSTARD	naturalized	
Brassica tournefortii Gouan	BRASSICACEAE		naturalized	
Brickellia atractyloides A. Gray	ASTERACEAE		native	
Brickellia atractyloides A. Gray var. arguta (B. L. Rob.) Jeps.	ASTERACEAE	PUNGENT BRICKELLBUSH	native	
Brickellia atractyloides A. Gray var. atractyloides	ASTERACEAE	SPEARLEAF BRICKELLBUSH	native	
Brickellia atractyloides A. Gray var. odontolepis (B. L. Robinson) Jeps.	ASTERACEAE		native	
Brickellia californica (Torr. & A. Gray) A. Gray	ASTERACEAE	CALIFORNIA BRICKELLBUSH	native	
Brickellia desertorum Coville	ASTERACEAE		native	
Brickellia frutescens A. Gray	ASTERACEAE		native	
Brickellia grandiflora (Hook.) Nutt.	ASTERACEAE		native	
Brickellia greenei A. Gray	ASTERACEAE		native	
Brickellia incana A. Gray	ASTERACEAE		native	
Brickellia knappiana Drew	ASTERACEAE		native	
Brickellia longifolia S. Watson	ASTERACEAE		native	
Brickellia longifolia S. Watson var. longifolia	ASTERACEAE		native	
Brickellia longifolia S. Watson var. multiflora (Kellogg) Cronquist	ASTERACEAE		native	
Brickellia microphylla (Nutt.) A. Gray	ASTERACEAE		native	
Brickellia microphylla (Nutt.) A. Gray var. microphylla	ASTERACEAE		native	
Brickellia microphylla (Nutt.) A. Gray var. scabra A. Gray	ASTERACEAE		native	
Brickellia nevinii A. Gray	ASTERACEAE		native	
Brickellia oblongifolia Nutt.	ASTERACEAE		native	
Brickellia oblongifolia Nutt. var. linifolia (D. C. Eaton) B. L. Rob.	ASTERACEAE		native	
Briza maxima L.	POACEAE	LARGE QUAKING GRASS	naturalized	
Briza minor L.	POACEAE	SMALL QUAKING GRASS	naturalized	
Brodiaea appendiculata Hoover	THEMIDACEAE		native	
Brodiaea californica Lindl.	THEMIDACEAE	CALIFORNIA BRODIAEA	native	
Brodiaea coronaria (Salisb.) Engl.	THEMIDACEAE	GARLAND BRODIAEA	native	
Brodiaea elegans Hoover	THEMIDACEAE		native	
Brodiaea elegans Hoover subsp. elegans	THEMIDACEAE	HARVEST BRODIAEA	native	
Brodiaea filifolia S. Watson	THEMIDACEAE	THREAD-LEAVED BRODIAEA	native	
Brodiaea insignis (Jeps.) T. F. Niehaus	THEMIDACEAE	KAWEAH BRODIAEA	native	
Brodiaea jolonensis Eastw.	THEMIDACEAE	CHAPARRAL CLUSTER-LILY	native	
Brodiaea kinkiensis T. F. Niehaus	THEMIDACEAE	SAN CLEMENTE ISLAND BRODIAEA	native	
Brodiaea leptandra (Greene) Baker	THEMIDACEAE	NARROW-FLOWERED CALIFORNIA BRODIAEA	native	
Brodiaea matsonii R.E. Preston	THEMIDACEAE		native	
Brodiaea minor (Benth.) S. Watson	THEMIDACEAE	SMALL BRODIAEA	native	
Brodiaea nana Hoover	THEMIDACEAE	DWARF BRODIAEA	native	
Brodiaea orcuttii (Greene) Baker	THEMIDACEAE	ORCUTT'S BRODIAEA	native	
Brodiaea pallida Hoover	THEMIDACEAE	CHINESE CAMP BRODIAEA	native	
Brodiaea rosea Greene	THEMIDACEAE	INDIAN VALLEY BRODIAEA	native	
Brodiaea santarosae T. J. Chester, W. P. Armstr., & Madore	THEMIDACEAE	SANTA ROSA BASALT BRODIAEA	native	
Brodiaea sierrae R. E. Preston	THEMIDACEAE	SIERRA FOOTHILLS BRODIAEA	native	
Brodiaea stellaris S. Watson	THEMIDACEAE	STAR BRODIAEA	native	
Brodiaea terrestris Kellogg	THEMIDACEAE		native	
Brodiaea terrestris Kellogg subsp. kernensis (Hoover) T. F. Niehaus	THEMIDACEAE		native	
Brodiaea terrestris Kellogg subsp. terrestris	THEMIDACEAE		native	
Bromus arenarius Labill.	POACEAE	AUSTRALIAN CHESS	naturalized	
Bromus arizonicus (Shear) Stebbins	POACEAE	ARIZONA BROME	native	
Bromus berteroanus Colla	POACEAE	CHILEAN CHESS	naturalized	
Bromus briziformis Fisch. & C. A. Mey.	POACEAE	RATTLESNAKE CHESS	naturalized	
Bromus carinatus Hook. & Arn.	POACEAE	CALIFORNIA BROME	native	
Bromus carinatus Hook. & Arn. var. carinatus	POACEAE		native	
Bromus carinatus Hook. & Arn. var. marginatus (Nees ex Steud.) Barkworth & Anderton	POACEAE	MOUNTAIN BROME	native	
Bromus caroli-henrici Greuter	POACEAE		naturalized	
Bromus catharticus Vahl	POACEAE		naturalized	
Bromus catharticus Vahl var. catharticus	POACEAE	RESCUE GRASS	naturalized	
Bromus catharticus Vahl var. elatus (E. Desv.) Planchuelo	POACEAE	CHILEAN BROME	naturalized	
Bromus ciliatus L.	POACEAE	FRINGED BROME	native	
Bromus commutatus Schrad.	POACEAE	MEADOW BROME	naturalized	
Bromus diandrus Roth	POACEAE	RIPGUT GRASS	naturalized	
Bromus grandis (Shear) Hitchc.	POACEAE	TALL BROME	native	
Bromus hallii (Hitchc.) Saarela & P.M. Peterson	POACEAE	HALL'S BROME	native	
Bromus hordeaceus L.	POACEAE	SOFT CHESS	naturalized	
Bromus inermis Leyss.	POACEAE	HUNGARIAN BROME	naturalized	
Bromus japonicus Thunb.	POACEAE	JAPANESE BROME	naturalized	
Bromus laevipes Shear	POACEAE	WOODLAND BROME	native	
Bromus madritensis L.	POACEAE		naturalized	
Bromus madritensis L. subsp. madritensis	POACEAE	MADRID BROME	naturalized	
Bromus madritensis L. subsp. rubens (L.) Husn.	POACEAE	RED BROME	naturalized	
Bromus maritimus (Piper) Hitchc.	POACEAE	MARITIME BROME	native	
Bromus orcuttianus Vasey	POACEAE	ORCUTT'S BROME	native	
Bromus polyanthus Scribn. ex Shear	POACEAE	COLORADO BROME	native	
Bromus porteri (J. M. Coult.) Nash	POACEAE	NODDING BROME	native	
Bromus pseudolaevipes Wagnon	POACEAE	WOODLAND BROME	native	
Bromus racemosus L.	POACEAE	SMOOTH BROME	naturalized	
Bromus richardsonii Link	POACEAE	RICHARDSON'S BROME	native	
Bromus secalinus L.	POACEAE	RYE BROME	naturalized	
Bromus sitchensis Trin.	POACEAE	ALASKA BROME	native	
Bromus squarrosus L.	POACEAE	CORN BROME	naturalized	
Bromus sterilis L.	POACEAE	POVERTY BROME	naturalized	
Bromus suksdorfii Vasey	POACEAE	SUKSDORF'S BROME	native	
Bromus tectorum L.	POACEAE	DOWNY CHESS	naturalized	
Bromus vulgaris (Hook.) Shear	POACEAE	COLUMBIA BROME	native	
Buddleja davidii Franch.	SCROPHULARIACEAE	SUMMER LILAC	naturalized	
Buddleja saligna Willd.	SCROPHULARIACEAE	FALSE OLIVE	naturalized	
Buddleja utahensis Coville	SCROPHULARIACEAE	PANAMINT BUTTERFLY BUSH	native	
Bulbostylis capillaris (L.) C. B. Clarke	CYPERACEAE	THREAD-LEAVED BEAKSEED	native	
Bursera microphylla A. Gray	BURSERACEAE	LITTLELEAF ELEPHANT TREE	native	
Cabomba caroliniana A. Gray	CABOMBACEAE		naturalized	
Cacaliopsis nardosmia (A. Gray) A. Gray	ASTERACEAE		native	
Caesalpinia gilliesii (Hook.) D. Dietr.	FABACEAE	BIRD-OF-PARADISE	naturalized	
Caesalpinia spinosa (Molina) Kuntze	FABACEAE	TARA	naturalized	
Cakile edentula (Bigelow) Hook.	BRASSICACEAE		naturalized	
Cakile maritima Scop.	BRASSICACEAE		naturalized	
Calamagrostis bolanderi Thurb.	POACEAE	BOLANDER'S REED GRASS	native	
Calamagrostis breweri Thurb.	POACEAE	SHORT HAIR REED GRASS	native	
Calamagrostis canadensis (Michx.) P. Beauv.	POACEAE		native	
Calamagrostis canadensis (Michx.) P. Beauv. var. canadensis	POACEAE	BLUEJOINT REED GRASS	native	
Calamagrostis canadensis (Michx.) P. Beauv. var. langsdorffii (Link) Inman	POACEAE		native	
Calamagrostis foliosa Kearney	POACEAE	LEAFY REED GRASS	native	
Calamagrostis koelerioides Vasey	POACEAE	DENSE-PINE REED GRASS	native	
Calamagrostis muiriana B. L. Wilson & Sami Gray	POACEAE	MUIR'S REED GRASS	native	
Calamagrostis nutkaensis (J. Presl) Steud.	POACEAE	PACIFIC REED GRASS	native	
Calamagrostis ophitidis (J. T. Howell) Nygren	POACEAE	SERPENTINE REED GRASS	native	
Calamagrostis purpurascens R. Br.	POACEAE	PURPLE REED GRASS	native	
Calamagrostis rubescens Buckley	POACEAE	PINE REED GRASS	native	
Calamagrostis stricta (Timm) Koeler	POACEAE	SLIPSTEM REED GRASS	native	
Calamagrostis stricta (Timm) Koeler subsp. inexpansa (A. Gray) C. W. Greene	POACEAE		native	
Calamagrostis stricta (Timm) Koeler subsp. stricta	POACEAE		native	
Calandrinia breweri S. Watson	MONTIACEAE	BREWER'S CALANDRINIA	native	
Calendula arvensis L.	ASTERACEAE	FIELD-MARIGOLD	naturalized	
Calendula officinalis L.	ASTERACEAE	POT-MARIGOLD	naturalized	
California macrophylla (Hook. & Arn.) J. J. Aldasoro, C. Navarro, P. Vargas, L. Sáez, & C. Aedo	GERANIACEAE	ROUND-LEAVED FILAREE	native	
Calliandra eriophylla Benth.	FABACEAE	PINK FAIRY-DUSTER	native	
Callitriche fassettii Schotsman	PLANTAGINACEAE		native	
Callitriche heterophylla Pursh	PLANTAGINACEAE		native	
Callitriche heterophylla Pursh var. bolanderi (Hegelm.) Fassett	PLANTAGINACEAE		native	
Callitriche heterophylla Pursh var. heterophylla	PLANTAGINACEAE		native	
Callitriche longipedunculata Morong	PLANTAGINACEAE		native	
Callitriche marginata Torr.	PLANTAGINACEAE		native	
Callitriche palustris L.	PLANTAGINACEAE		native	
Callitriche stagnalis Scop.	PLANTAGINACEAE		naturalized	
Callitriche trochlearis Fassett	PLANTAGINACEAE		native	
Callitropsis nootkatensis (D. Don) Florin ex D. P. Little	CUPRESSACEAE	ALASKA CEDAR	native	
Calocedrus decurrens (Torr.) Florin	CUPRESSACEAE		native	
Calochortus albus (Benth.) Douglas ex Benth.	LILIACEAE	FAIRY-LANTERN	native	
Calochortus amabilis Purdy	LILIACEAE	DIOGENES' LANTERN	native	
Calochortus amoenus Greene	LILIACEAE		native	
Calochortus argillosus (Hoover) Zebell & P. L. Fiedl.	LILIACEAE	CLAY MARIPOSA LILY	native	
Calochortus bruneaunis A. Nelson & J. F. Macbr.	LILIACEAE		native	
Calochortus catalinae S. Watson	LILIACEAE	CATALINA MARIPOSA LILY	native	
Calochortus clavatus S. Watson	LILIACEAE		native	
Calochortus clavatus S. Watson var. avius Jeps.	LILIACEAE	PLEASANT VALLEY MARIPOSA LILY	native	
Calochortus clavatus S. Watson var. clavatus	LILIACEAE	CLUB-HAIRED MARIPOSA LILY	native	
Calochortus clavatus S. Watson var. gracilis Ownbey	LILIACEAE	SLENDER MARIPOSA LILY	native	
Calochortus clavatus S. Watson var. pallidus (Hoover) P. L. Fiedl. & Zebell	LILIACEAE		native	
Calochortus clavatus S. Watson var. recurvifolius (Hoover) P. L. Fiedl. & Zebell	LILIACEAE	ARROYO DE LA CRUZ MARIPOSA LILY	native	
Calochortus coeruleus (Kellogg) S. Watson	LILIACEAE	BEAVERTAIL-GRASS	native	
Calochortus concolor (Baker) Purdy	LILIACEAE		native	
Calochortus dunnii Purdy	LILIACEAE	DUNN'S MARIPOSA LILY	native	
Calochortus elegans Pursh	LILIACEAE	CAT'S EAR	native	
Calochortus excavatus Greene	LILIACEAE	INYO COUNTY STAR-TULIP	native	
Calochortus fimbriatus H. P. McDonald	LILIACEAE		native	
Calochortus flexuosus S. Watson	LILIACEAE		native	
Calochortus greenei S. Watson	LILIACEAE	GREENE'S MARIPOSA LILY	native	
Calochortus invenustus Greene	LILIACEAE		native	
Calochortus kennedyi Porter	LILIACEAE		native	
Calochortus kennedyi Porter var. kennedyi	LILIACEAE		native	
Calochortus kennedyi Porter var. munzii Jeps.	LILIACEAE		native	
Calochortus leichtlinii Hook. f.	LILIACEAE		native	
Calochortus longebarbatus S. Watson	LILIACEAE		native	
Calochortus longebarbatus S. Watson var. longebarbatus	LILIACEAE	LONG-HAIRED STAR-TULIP	native	
Calochortus luteus Lindl.	LILIACEAE		native	
Calochortus macrocarpus Douglas	LILIACEAE		native	
Calochortus minimus Ownbey	LILIACEAE		native	
Calochortus monophyllus (Lindl.) Lem.	LILIACEAE	YELLOW STAR-TULIP	native	
Calochortus nudus S. Watson	LILIACEAE		native	
Calochortus obispoensis Lemmon	LILIACEAE	SAN LUIS MARIPOSA LILY	native	
Calochortus palmeri S. Watson	LILIACEAE		native	
Calochortus palmeri S. Watson var. munzii Ownbey	LILIACEAE	SAN JACINTO MARIPOSA LILY	native	
Calochortus palmeri S. Watson var. palmeri	LILIACEAE	PALMER'S MARIPOSA LILY	native	
Calochortus panamintensis (Ownbey) Reveal	LILIACEAE	PANAMINT MARIPOSA LILY	native	
Calochortus persistens Ownbey	LILIACEAE	SISKIYOU MARIPOSA LILY	native	
Calochortus plummerae Greene	LILIACEAE	PLUMMER'S MARIPOSA LILY	native	
Calochortus pulchellus (Benth.) Alph. Wood	LILIACEAE	MOUNT DIABLO FAIRY-LANTERN	native	
Calochortus raichei Farwig & V. Girard	LILIACEAE	THE CEDARS FAIRY-LANTERN	native	
Calochortus simulans (Hoover) Munz	LILIACEAE	LA PANZA MARIPOSA LILY	native	
Calochortus splendens Benth.	LILIACEAE		native	
Calochortus striatus Parish	LILIACEAE	ALKALI MARIPOSA LILY	native	
Calochortus superbus Purdy ex J. T. Howell	LILIACEAE		native	
Calochortus syntrophus Callahan	LILIACEAE	CALLAHAN'S MARIPOSA LILY	native	
Calochortus tiburonensis A. J. Hill	LILIACEAE	TIBURON MARIPOSA LILY	native	
Calochortus tolmiei Hook. & Arn.	LILIACEAE	PUSSY EARS	native	
Calochortus umbellatus Alph. Wood	LILIACEAE	OAKLAND STAR-TULIP	native	
Calochortus uniflorus Hook. & Arn.	LILIACEAE	LARGE-FLOWERED MARIPOSA LILY	native	
Calochortus venustus Douglas ex Benth.	LILIACEAE		native	
Calochortus vestae Purdy	LILIACEAE		native	
Calochortus weedii Alph. Wood	LILIACEAE		native	
Calochortus weedii Alph. Wood var. intermedius Ownbey	LILIACEAE	INTERMEDIATE MARIPOSA LILY	native	
Calochortus weedii Alph. Wood var. weedii	LILIACEAE		native	
Calochortus westonii Eastw.	LILIACEAE	SHIRLEY MEADOWS STAR-TULIP	native	
Caltha leptosepala DC.	RANUNCULACEAE		native	
Caltha palustris L.	RANUNCULACEAE		naturalized	
Calycadenia fremontii A. Gray	ASTERACEAE		native	
Calycadenia hooveri G. D. Carr	ASTERACEAE	HOOVER'S CALYCADENIA	native	
Calycadenia micrantha R. L. Carr & G. D. Carr	ASTERACEAE	SMALL-FLOWERED CALYCADENIA	native	
Calycadenia mollis A. Gray	ASTERACEAE		native	
Calycadenia multiglandulosa DC.	ASTERACEAE		native	
Calycadenia oppositifolia (Greene) Greene	ASTERACEAE	BUTTE COUNTY CALYCADENIA	native	
Calycadenia pauciflora A. Gray	ASTERACEAE		native	
Calycadenia spicata (Greene) Greene	ASTERACEAE		native	
Calycadenia truncata DC.	ASTERACEAE	ROSIN WEED	native	
Calycadenia villosa DC.	ASTERACEAE	DWARF CALYCADENIA	native	
Calycanthus occidentalis Hook. & Arn.	CALYCANTHACEAE	SPICEBUSH	native	
Calycoseris parryi A. Gray	ASTERACEAE	YELLOW TACK-STEM	native	
Calycoseris wrightii A. Gray	ASTERACEAE	WHITE TACK-STEM	native	
Calypso bulbosa (L.) Oakes	ORCHIDACEAE		native	
Calypso bulbosa (L.) Oakes var. occidentalis (Holz.) B. Boivin	ORCHIDACEAE		native	
Calyptridium monandrum Nutt.	MONTIACEAE		native	
Calyptridium monospermum Greene	MONTIACEAE		native	
Calyptridium parryi A. Gray	MONTIACEAE		native	
Calyptridium parryi A. Gray var. arizonicum J. T. Howell	MONTIACEAE		native	
Calyptridium parryi A. Gray var. hesseae J. H. Thomas	MONTIACEAE	SANTA CRUZ MOUNTAINS PUSSYPAWS	native	
Calyptridium parryi A. Gray var. nevadense J. T. Howell	MONTIACEAE		native	
Calyptridium parryi A. Gray var. parryi	MONTIACEAE		native	
Calyptridium pulchellum (Eastw.) Hoover	MONTIACEAE	MARIPOSA PUSSYPAWS	native	
Calyptridium pygmaeum Parish ex Rydb.	MONTIACEAE	PYGMY PUSSYPAWS	native	
Calyptridium quadripetalum S. Watson	MONTIACEAE	FOUR-PETALED PUSSYPAWS	native	
Calyptridium roseum S. Watson	MONTIACEAE	ROSY CALYPTRIDIUM	native	
Calyptridium umbellatum (Torr.) Greene	MONTIACEAE		native	
Calystegia atriplicifolia Hallier f.	CONVOLVULACEAE		native	
Calystegia atriplicifolia Hallier f. subsp. buttensis Brummitt	CONVOLVULACEAE	BUTTE COUNTY MORNING-GLORY	native	
Calystegia collina (Greene) Brummitt	CONVOLVULACEAE		native	
Calystegia collina (Greene) Brummitt subsp. collina	CONVOLVULACEAE		native	
Calystegia collina (Greene) Brummitt subsp. oxyphylla Brummitt	CONVOLVULACEAE	MOUNT SAINT HELENA MORNING-GLORY	native	
Calystegia collina (Greene) Brummitt subsp. tridactylosa (Eastw.) Brummitt	CONVOLVULACEAE	THREE-FINGERED MORNING-GLORY	native	
Calystegia collina (Greene) Brummitt subsp. venusta Brummitt	CONVOLVULACEAE	SOUTH COAST RANGE MORNING-GLORY	native	
Calystegia longipes (S. Watson) Brummitt	CONVOLVULACEAE		native	
Calystegia macrostegia (Greene) Brummitt	CONVOLVULACEAE		native	
Calystegia macrostegia (Greene) Brummitt subsp. amplissima Brummitt	CONVOLVULACEAE	ISLAND MORNING-GLORY	native	
Calystegia macrostegia (Greene) Brummitt subsp. arida (Greene) Brummitt	CONVOLVULACEAE		native	
Calystegia macrostegia (Greene) Brummitt subsp. cyclostegia (House) Brummitt	CONVOLVULACEAE		native	
Calystegia macrostegia (Greene) Brummitt subsp. intermedia (Abrams) Brummitt	CONVOLVULACEAE		native	
Calystegia macrostegia (Greene) Brummitt subsp. macrostegia	CONVOLVULACEAE		native	
Calystegia macrostegia (Greene) Brummitt subsp. tenuifolia (Abrams) Brummitt	CONVOLVULACEAE		native	
Calystegia malacophylla (Greene) Munz	CONVOLVULACEAE		native	
Calystegia malacophylla (Greene) Munz subsp. malacophylla	CONVOLVULACEAE		native	
Calystegia malacophylla (Greene) Munz subsp. pedicellata (Jeps.) Munz	CONVOLVULACEAE		native	
Calystegia occidentalis (A. Gray) Brummitt	CONVOLVULACEAE		native	
Calystegia occidentalis (A. Gray) Brummitt subsp. fulcrata (A. Gray) Brummitt	CONVOLVULACEAE		native	
Calystegia occidentalis (A. Gray) Brummitt subsp. occidentalis	CONVOLVULACEAE		native	
Calystegia peirsonii (Abrams) Brummitt	CONVOLVULACEAE	PEIRSON'S MORNING-GLORY	native	
Calystegia purpurata (Greene) Brummitt	CONVOLVULACEAE		native	
Calystegia purpurata (Greene) Brummitt subsp. purpurata	CONVOLVULACEAE		native	
Calystegia purpurata (Greene) Brummitt subsp. saxicola (Eastw.) Brummitt	CONVOLVULACEAE	COASTAL BLUFF MORNING-GLORY	native	
Calystegia sepium (L.) R. Br.	CONVOLVULACEAE	HEDGE BINDWEED	native	
Calystegia sepium (L.) R. Br. subsp. binghamiae (Greene) Brummitt	CONVOLVULACEAE	SANTA BARBARA MORNING-GLORY	native	
Calystegia sepium (L.) R. Br. subsp. limnophila (Greene) Brummitt	CONVOLVULACEAE		native	
Calystegia silvatica (Kit.) Griseb.	CONVOLVULACEAE		naturalized	
Calystegia silvatica (Kit.) Griseb. subsp. disjuncta Brummitt	CONVOLVULACEAE	LARGE BINDWEED	naturalized	
Calystegia soldanella (L.) R. Br.	CONVOLVULACEAE		native	
Calystegia stebbinsii Brummitt	CONVOLVULACEAE	STEBBINS' MORNING-GLORY	native	
Calystegia subacaulis Hook. & Arn.	CONVOLVULACEAE		native	
Calystegia subacaulis Hook. & Arn. subsp. episcopalis Brummitt	CONVOLVULACEAE	CAMBRIA MORNING-GLORY	native	
Calystegia subacaulis Hook. & Arn. subsp. subacaulis	CONVOLVULACEAE		native	
Camassia leichtlinii (Baker) S. Watson	AGAVACEAE		native	
Camassia leichtlinii (Baker) S. Watson subsp. suksdorfii (Greenm.) Gould	AGAVACEAE		native	
Camassia quamash (Pursh) Greene	AGAVACEAE		native	
Camassia quamash (Pursh) Greene subsp. breviflora Gould	AGAVACEAE		native	
Camelina microcarpa Andrz. ex DC.	BRASSICACEAE		naturalized	
Camissonia benitensis P. H. Raven	ONAGRACEAE	SAN BENITO EVENING-PRIMROSE	native	
Camissonia campestris (Greene) P. H. Raven	ONAGRACEAE		native	
Camissonia campestris (Greene) P. H. Raven subsp. campestris	ONAGRACEAE		native	
Camissonia campestris (Greene) P. H. Raven subsp. obispoensis P. H. Raven	ONAGRACEAE		native	
Camissonia contorta (Douglas) Kearney	ONAGRACEAE		native	
Camissonia integrifolia P. H. Raven	ONAGRACEAE	KERN RIVER EVENING-PRIMROSE	native	
Camissonia kernensis (Munz) P. H. Raven	ONAGRACEAE		native	
Camissonia kernensis (Munz) P. H. Raven subsp. gilmanii (Munz) P. H. Raven	ONAGRACEAE		native	
Camissonia kernensis (Munz) P. H. Raven subsp. kernensis	ONAGRACEAE	KERN COUNTY EVENING-PRIMROSE	native	
Camissonia lacustris P. H. Raven	ONAGRACEAE		native	
Camissonia parvula (Nutt. ex Torr. & A. Gray) P. H. Raven	ONAGRACEAE		native	
Camissonia pubens (S. Watson) P. H. Raven	ONAGRACEAE		native	
Camissonia pusilla P. H. Raven	ONAGRACEAE		native	
Camissonia sierrae P. H. Raven	ONAGRACEAE		native	
Camissonia sierrae P. H. Raven subsp. alticola P. H. Raven	ONAGRACEAE	MONO HOT SPRINGS EVENING-PRIMROSE	native	
Camissonia sierrae P. H. Raven subsp. sierrae	ONAGRACEAE	YOSEMITE EVENING-PRIMROSE	native	
Camissonia strigulosa (Fisch. & C. A. Mey.) P. H. Raven	ONAGRACEAE		native	
Camissoniopsis bistorta (Torr. & A. Gray) W.L. Wagner & Hoch	ONAGRACEAE	CALIFORNIA SUN CUP	native	
Camissoniopsis cheiranthifolia (Spreng.) W.L. Wagner & Hoch	ONAGRACEAE	BEACH EVENING-PRIMROSE	native	
Camissoniopsis cheiranthifolia (Spreng.) W.L. Wagner & Hoch subsp. cheiranthifolia	ONAGRACEAE		native	
Camissoniopsis cheiranthifolia (Spreng.) W.L. Wagner & Hoch subsp. suffruticosa (S. Watson) W.L. Wagner & Hoch	ONAGRACEAE		native	
Camissoniopsis confusa (P.H. Raven) W.L. Wagner & Hoch	ONAGRACEAE		native	
Camissoniopsis guadalupensis (S. Watson) W.L. Wagner & Hoch	ONAGRACEAE		native	
Camissoniopsis guadalupensis (S. Watson) W.L. Wagner & Hoch subsp. clementina (P.H. Raven) W.L. Wagner & Hoch	ONAGRACEAE	SAN CLEMENTE ISLAND EVENING-PRIMROSE	native	
Camissoniopsis hardhamiae (P.H. Raven) W.L. Wagner & Hoch	ONAGRACEAE	HARDHAM'S EVENING-PRIMROSE	native	
Camissoniopsis hirtella (Greene) W.L. Wagner & Hoch	ONAGRACEAE		native	
Camissoniopsis ignota (Jeps.) W.L. Wagner & Hoch	ONAGRACEAE		native	
Camissoniopsis intermedia (P.H. Raven) W.L. Wagner & Hoch	ONAGRACEAE		native	
Camissoniopsis lewisii (P.H. Raven) W.L. Wagner & Hoch	ONAGRACEAE	LEWIS' EVENING-PRIMROSE	native	
Camissoniopsis luciae (P.H. Raven) W.L. Wagner & Hoch	ONAGRACEAE		native	
Camissoniopsis micrantha (Hornem. ex Spreng.) W.L. Wagner & Hoch	ONAGRACEAE		native	
Camissoniopsis pallida (Abrams) W.L. Wagner & Hoch	ONAGRACEAE		native	
Camissoniopsis pallida (Abrams) W.L. Wagner & Hoch subsp. hallii (Davidson) W.L. Wagner & Hoch	ONAGRACEAE		native	
Camissoniopsis pallida (Abrams) W.L. Wagner & Hoch subsp. pallida	ONAGRACEAE		native	
Camissoniopsis robusta (P.H. Raven) W.L. Wagner & Hoch	ONAGRACEAE		native	
Campanula angustiflora Eastw.	CAMPANULACEAE		native	
Campanula californica (Kellogg) A. Heller	CAMPANULACEAE	SWAMP HAREBELL	native	
Campanula exigua Rattan	CAMPANULACEAE	CHAPARRAL HAREBELL	native	
Campanula griffinii Morin	CAMPANULACEAE		native	
Campanula rotundifolia L.	CAMPANULACEAE		native	
Campanula scabrella Engelm.	CAMPANULACEAE	ROUGH HAREBELL	native	
Campanula scouleri A. DC.	CAMPANULACEAE	SCOULER'S HAREBELL	native	
Campanula sharsmithiae Morin	CAMPANULACEAE	SHARSMITH'S HAREBELL	native	
Campanula shetleri Heckard	CAMPANULACEAE	CASTLE CRAGS HAREBELL	native	
Campanula wilkinsiana Greene	CAMPANULACEAE	WILKINS' HAREBELL	native	
Canbya candida Parry ex A. Gray	PAPAVERACEAE	WHITE PYGMY-POPPY	native	
Cannabis sativa L.	CANNABACEAE	MARIJUANA	naturalized	
Capsella bursa-pastoris (L.) Medik.	BRASSICACEAE		naturalized	
Cardamine angulata Hook.	BRASSICACEAE		native	
Cardamine bellidifolia L.	BRASSICACEAE		native	
Cardamine breweri S. Watson	BRASSICACEAE		native	
Cardamine californica (Nutt.) Greene	BRASSICACEAE	TOOTH WORT	native	
Cardamine cordifolia A. Gray	BRASSICACEAE		native	
Cardamine hirsuta L.	BRASSICACEAE		naturalized	
Cardamine nuttallii Greene	BRASSICACEAE		native	
Cardamine occidentalis (S. Watson) Howell	BRASSICACEAE		native	
Cardamine oligosperma Nutt.	BRASSICACEAE		native	
Cardamine pachystigma (S. Watson) Rollins	BRASSICACEAE		native	
Cardamine pensylvanica Muhl. ex Willd.	BRASSICACEAE		native	
Cardionema ramosissimum (Weinm.) A. Nelson & J. F. Macbr.	CARYOPHYLLACEAE		native	
Carduus acanthoides L.	ASTERACEAE		naturalized	
Carduus acanthoides L. subsp. acanthoides	ASTERACEAE	PLUMELESS THISTLE	naturalized	
Carduus nutans L.	ASTERACEAE	MUSK THISTLE	naturalized	
Carduus pycnocephalus L.	ASTERACEAE		naturalized	
Carduus pycnocephalus L. subsp. pycnocephalus	ASTERACEAE	ITALIAN THISTLE	naturalized	
Carduus tenuiflorus Curtis	ASTERACEAE		naturalized	
Carex abrupta Mack.	CYPERACEAE	ABRUPT-BEAKED SEDGE	native	
Carex albonigra Mack.	CYPERACEAE	BLACK-AND-WHITE SEDGE	native	
Carex alma L. H. Bailey	CYPERACEAE	STURDY SEDGE	native	
Carex amplifolia Boott	CYPERACEAE	BIG-LEAF SEDGE	native	
Carex angustata Boott	CYPERACEAE	NARROW-LEAVED SEDGE	native	
Carex aquatilis Wahlenb.	CYPERACEAE		native	
Carex aquatilis Wahlenb. var. aquatilis	CYPERACEAE	WATER SEDGE	native	
Carex aquatilis Wahlenb. var. dives (Holm) Kük.	CYPERACEAE	SITKA SEDGE	native	
Carex arcta Boott	CYPERACEAE	NORTHERN CLUSTERED SEDGE	native	
Carex atherodes Spreng.	CYPERACEAE	WHEAT SEDGE	native	
Carex athrostachya Olney	CYPERACEAE	LONG-BRACTED SEDGE	native	
Carex aurea Nutt.	CYPERACEAE	GOLDEN SEDGE	native	
Carex barbarae Dewey	CYPERACEAE	SANTA BARBARA SEDGE	native	
Carex bolanderi Olney	CYPERACEAE	BOLANDER'S SEDGE	native	
Carex brainerdii Mack.	CYPERACEAE	BRAINERD'S SEDGE	native	
Carex brevicaulis Mack.	CYPERACEAE	SHORT-STEMMED SEDGE	native	
Carex breweri Boott	CYPERACEAE	BREWER'S SEDGE	native	
Carex buxbaumii Wahlenb.	CYPERACEAE	BUXBAUM'S SEDGE	native	
Carex californica L. H. Bailey	CYPERACEAE	CALIFORNIA SEDGE	native	
Carex canescens L.	CYPERACEAE		native	
Carex canescens L. subsp. canescens	CYPERACEAE	SILVERY SEDGE	native	
Carex capitata L.	CYPERACEAE	CAPITATE SEDGE	native	
Carex comosa Boott	CYPERACEAE	BRISTLY SEDGE	native	
Carex concinnoides Mack.	CYPERACEAE	NORTHWESTERN SEDGE	native	
Carex congdonii L. H. Bailey	CYPERACEAE	CONGDON'S SEDGE	native	
Carex cusickii Mack. ex Piper & Beattie	CYPERACEAE	CUSICK'S SEDGE	native	
Carex davyi Mack.	CYPERACEAE	DAVY'S SEDGE	native	
Carex deflexa Hornem.	CYPERACEAE		native	
Carex deflexa Hornem. var. boottii L. H. Bailey	CYPERACEAE	MOUNTAIN MAT SEDGE	native	
Carex densa (L. H. Bailey) L. H. Bailey	CYPERACEAE	DENSE SEDGE	native	
Carex diandra Schrank	CYPERACEAE	LESSER TUSSOCK SEDGE	native	
Carex disperma Dewey	CYPERACEAE	TWO-SEEDED SEDGE	native	
Carex divulsa Stokes	CYPERACEAE		naturalized	
Carex divulsa Stokes subsp. divulsa	CYPERACEAE	GRAY SEDGE	naturalized	
Carex douglasii Boott	CYPERACEAE	DOUGLAS' SEDGE	native	
Carex duriuscula C. A. Mey.	CYPERACEAE	SPIKELETRUSH SEDGE	native	
Carex echinata Murray	CYPERACEAE		native	
Carex echinata Murray subsp. echinata	CYPERACEAE	STAR SEDGE	native	
Carex echinata Murray subsp. phyllomanica (W. Boott) Reznicek	CYPERACEAE	COASTAL STAR SEDGE	native	
Carex exsiccata L. H. Bailey	CYPERACEAE	WESTERN INFLATED SEDGE	native	
Carex feta L. H. Bailey	CYPERACEAE	GREEN-SHEATHED SEDGE	native	
Carex filifolia Nutt.	CYPERACEAE		native	
Carex filifolia Nutt. var. erostrata Kük.	CYPERACEAE	SAGEBRUSH SEDGE	native	
Carex filifolia Nutt. var. filifolia	CYPERACEAE	THREAD-LEAVED SEDGE	native	
Carex fissuricola Mack.	CYPERACEAE	CLEFT SEDGE	native	
Carex fracta Mack.	CYPERACEAE	FRAGILE-SHEATHED SEDGE	native	
Carex geyeri Boott	CYPERACEAE	GEYER'S SEDGE	native	
Carex globosa Boott	CYPERACEAE	ROUND-FRUITED SEDGE	native	
Carex gracilior Mack.	CYPERACEAE	SLENDER SEDGE	native	
Carex gynodynama Olney	CYPERACEAE	WONDER-WOMAN SEDGE	native	
Carex halliana L. H. Bailey	CYPERACEAE	OREGON SEDGE	native	
Carex harfordii Mack.	CYPERACEAE	MONTEREY SEDGE	native	
Carex hassei L. H. Bailey	CYPERACEAE	HASSE'S SEDGE	native	
Carex haydeniana Olney	CYPERACEAE	HAYDEN'S SEDGE	native	
Carex helleri Mack.	CYPERACEAE	HELLER'S SEDGE	native	
Carex hendersonii L. H. Bailey	CYPERACEAE	HENDERSON'S SEDGE	native	
Carex heteroneura W. Boott	CYPERACEAE	SMOOTH-FRUITED SEDGE	native	
Carex hirtissima W. Boott	CYPERACEAE	FUZZY SEDGE	native	
Carex hoodii Boott	CYPERACEAE	HOOD'S SEDGE	native	
Carex hystericina Muhl. ex Willd.	CYPERACEAE	PORCUPINE SEDGE	native	
Carex idahoa L. H. Bailey	CYPERACEAE	IDAHO SEDGE	native	
Carex illota L. H. Bailey	CYPERACEAE	SHEEP SEDGE	native	
Carex incurviformis Mack.	CYPERACEAE	INCURVED SEDGE	native	
Carex infirminervia Naczi	CYPERACEAE	WEAKLY VEINED SEDGE	native	
Carex inops L. H. Bailey	CYPERACEAE		native	
Carex inops L. H. Bailey subsp. inops	CYPERACEAE	LONG-RHIZOMED SEDGE	native	
Carex integra Mack.	CYPERACEAE	SMOOTH-BEAKED SEDGE	native	
Carex interior L. H. Bailey	CYPERACEAE	INLAND SEDGE	native	
Carex inversa R. Br.	CYPERACEAE	KNOB SEDGE	naturalized	
Carex jonesii L. H. Bailey	CYPERACEAE	JONES' SEDGE	native	
Carex klamathensis B.L. Wilson & Janeway	CYPERACEAE	KLAMATH SEDGE	native	
Carex laeviculmis Meinsh.	CYPERACEAE	SMOOTH-STEMMED SEDGE	native	
Carex lasiocarpa Ehrh.	CYPERACEAE	WOOLLY-FRUITED SEDGE	native	
Carex lemmonii W. Boott	CYPERACEAE	LEMMON'S SEDGE	native	
Carex lenticularis Michx.	CYPERACEAE		native	
Carex lenticularis Michx. var. impressa (L. H. Bailey) L. A. Standl.	CYPERACEAE	TARN SEDGE	native	
Carex lenticularis Michx. var. limnophila (Holm) Cronquist	CYPERACEAE	LAGOON SEDGE	native	
Carex lenticularis Michx. var. lipocarpa (Holm) L. A. Standl.	CYPERACEAE	LAKESHORE SEDGE	native	
Carex leporina L.	CYPERACEAE	OVAL SEDGE	native	
Carex leporinella Mack.	CYPERACEAE	BOG HARE SEDGE	native	
Carex leptalea Wahlenb.	CYPERACEAE	BRISTLE-STALKED SEDGE	native	
Carex leptopoda Mack.	CYPERACEAE	SLENDER-FOOTED SEDGE	native	
Carex limosa L.	CYPERACEAE	MUD SEDGE	native	
Carex longii Mack.	CYPERACEAE	GREEN-AND-WHITE SEDGE	naturalized	
Carex luzulifolia W. Boott	CYPERACEAE	LITTLE-LEAVED SEDGE	native	
Carex luzulina Olney	CYPERACEAE	WOODRUSH SEDGE	native	
Carex lyngbyei Hornem.	CYPERACEAE	LYNGBYE'S SEDGE	native	
Carex mariposana L. H. Bailey ex Mack.	CYPERACEAE	MARIPOSA SEDGE	native	
Carex mendocinensis Olney ex W. Boott	CYPERACEAE	MENDOCINO SEDGE	native	
Carex mertensii J. D. Prescott ex Bong.	CYPERACEAE	MERTENS' SEDGE	native	
Carex microptera Mack.	CYPERACEAE	SMALL-WINGED SEDGE	native	
Carex multicaulis L. H. Bailey	CYPERACEAE	STICK SEDGE	native	
Carex multicostata Mack.	CYPERACEAE	MANY-RIBBED SEDGE	native	
Carex nebrascensis Dewey	CYPERACEAE	NEBRASKA SEDGE	native	
Carex nervina L. H. Bailey	CYPERACEAE	SIERRA SEDGE	native	
Carex neurophora Mack.	CYPERACEAE	ALPINE NERVED SEDGE	native	
Carex nigricans C. A. Mey.	CYPERACEAE	BLACK ALPINE SEDGE	native	
Carex nudata W. Boott	CYPERACEAE	TORRENT SEDGE	native	
Carex obispoensis Stacey	CYPERACEAE	SAN LUIS OBISPO SEDGE	native	
Carex obnupta L. H. Bailey	CYPERACEAE	SLOUGH SEDGE	native	
Carex occidentalis L. H. Bailey	CYPERACEAE	WESTERN SEDGE	native	
Carex pachystachya Cham. ex Steud.	CYPERACEAE	STARRY BROOMSEDGE	native	
Carex pansa L. H. Bailey	CYPERACEAE	SANDDUNE SEDGE	native	
Carex pellita Muhl. ex Willd.	CYPERACEAE	WOOLLY SEDGE	native	
Carex pendula Huds.	CYPERACEAE	PENDULOUS SEDGE	naturalized	
Carex petasata Dewey	CYPERACEAE	LIDDON'S SEDGE	native	
Carex phaeocephala Piper	CYPERACEAE	ALPINE HARE SEDGE	native	
Carex praeceptorum Mack.	CYPERACEAE	TEACHER SEDGE	native	
Carex praegracilis W. Boott	CYPERACEAE	FREEWAY SEDGE	native	
Carex praticola Rydb.	CYPERACEAE	NORTHERN MEADOW SEDGE	native	
Carex preslii Steud.	CYPERACEAE	PRESL'S SEDGE	native	
Carex proposita Mack.	CYPERACEAE	POTATO CHIP SEDGE	native	
Carex raynoldsii Dewey	CYPERACEAE	RAYNOLD'S SEDGE	native	
Carex rossii Boott	CYPERACEAE	ROSS' SEDGE	native	
Carex saliniformis Mack.	CYPERACEAE	DECEIVING SEDGE	native	
Carex sartwelliana Olney	CYPERACEAE	YOSEMITE SEDGE	native	
Carex scabriuscula Mack.	CYPERACEAE	SISKIYOU SEDGE	native	
Carex schottii Dewey	CYPERACEAE	SCHOTT'S SEDGE	native	
Carex scirpoidea Michx.	CYPERACEAE		native	
Carex scirpoidea Michx. subsp. pseudoscirpoidea (Rydb.) D. A. Dunlop	CYPERACEAE	WESTERN SINGLE-SPIKED SEDGE	native	
Carex scoparia Schkuhr ex Willd.	CYPERACEAE		native	
Carex scoparia Schkuhr ex Willd. var. scoparia	CYPERACEAE	POINTED BROOMSEDGE	native	
Carex scopulorum Holm	CYPERACEAE		native	
Carex scopulorum Holm var. bracteosa (L. H. Bailey) F. J. Herm.	CYPERACEAE	MOUNTAIN SEDGE	native	
Carex senta Boott	CYPERACEAE	WESTERN ROUGH SEDGE	native	
Carex serpenticola Zika	CYPERACEAE	SERPENTINE SEDGE	native	
Carex serratodens W. Boott	CYPERACEAE	SAW-TOOTHED SEDGE	native	
Carex sheldonii Mack.	CYPERACEAE	SHELDON'S SEDGE	native	
Carex simulata Mack.	CYPERACEAE	ANALOG SEDGE	native	
Carex specifica L. H. Bailey	CYPERACEAE	NARROW-FRUITED SEDGE	native	
Carex spectabilis Dewey	CYPERACEAE	SHOWY SEDGE	native	
Carex spissa L. H. Bailey	CYPERACEAE	SAN DIEGO SEDGE	native	
Carex stevenii (Holm) Kalela	CYPERACEAE	STEVEN'S SEDGE	native	
Carex stipata Muhl. ex Willd.	CYPERACEAE		native	
Carex stipata Muhl. ex Willd. var. stipata	CYPERACEAE	AWL-FRUITED SEDGE	native	
Carex straminiformis L. H. Bailey	CYPERACEAE	MOUNT SHASTA SEDGE	native	
Carex subbracteata Mack.	CYPERACEAE	SMALL-BRACTED SEDGE	native	
Carex subfusca W. Boott	CYPERACEAE	PALE BROOMSEDGE	native	
Carex subnigricans Stacey	CYPERACEAE	DARK MOUNTAIN SEDGE	native	
Carex tahoensis Smiley	CYPERACEAE	TAHOE SEDGE	native	
Carex texensis (Torr. ex L. H. Bailey) L. H. Bailey	CYPERACEAE	TEXAS SEDGE	naturalized	
Carex tiogana D. W. Taylor & J. D. Mastrog.	CYPERACEAE	TIOGA PASS SEDGE	native	
Carex tompkinsii J. T. Howell	CYPERACEAE	TOMPKINS' SEDGE	native	
Carex triquetra Boott	CYPERACEAE	TRIGONOUS SEDGE	native	
Carex tumulicola Mack.	CYPERACEAE	FOOTHILL SEDGE	native	
Carex unilateralis Mack.	CYPERACEAE	ONE-SIDED SEDGE	native	
Carex utriculata Boott	CYPERACEAE	SOUTHERN BEAKED SEDGE	native	
Carex vallicola Dewey	CYPERACEAE	WESTERN VALLEY SEDGE	native	
Carex vernacula L. H. Bailey	CYPERACEAE	FOETID SEDGE	native	
Carex vesicaria L.	CYPERACEAE	INFLATED SEDGE	native	
Carex viridula Michx.	CYPERACEAE		native	
Carex viridula Michx. subsp. viridula	CYPERACEAE	GREEN YELLOW SEDGE	native	
Carex vulpinoidea Michx.	CYPERACEAE	BROWN FOX SEDGE	naturalized	
Carex whitneyi Olney	CYPERACEAE	WHITNEY'S SEDGE	native	
Carlowrightia arizonica A. Gray	ACANTHACEAE	ARIZONA WRIGHTWORT	native	
Carlquistia muirii (A. Gray) B. G. Baldwin	ASTERACEAE	MUIR'S TARPLANT	native	
Carnegiea gigantea (Engelm.) Britton & Rose	CACTACEAE		native	
Carpenteria californica Torr.	HYDRANGEACEAE	TREE-ANEMONE	native	
Carpobrotus chilensis (Molina) N. E. Br.	AIZOACEAE	SEA FIG	naturalized	
Carpobrotus edulis (L.) N. E. Br.	AIZOACEAE	FREEWAY ICEPLANT	naturalized	
Carsonia sparsifolia (S. Watson) Greene	CLEOMACEAE		native	
Carthamus creticus L.	ASTERACEAE	SMOOTH DISTAFF THISTLE	naturalized	
Carthamus lanatus L.	ASTERACEAE	WOOLLY DISTAFF THISTLE	naturalized	
Carya illinoinensis (Wangenh.) K. Koch	JUGLANDACEAE	PECAN	naturalized	
Cascadia nuttallii (Small) A.M. Johnson	SAXIFRAGACEAE		native	
Cassiope mertensiana (Bong.) G. Don	ERICACEAE	WHITE HEATHER	native	
Castela emoryi (A. Gray) Moran & Felger	SIMAROUBACEAE	EMORY'S CRUCIFIXION-THORN	native	
Castilleja affinis Hook. & Arn.	OROBANCHACEAE		native	
Castilleja affinis Hook. & Arn. subsp. affinis	OROBANCHACEAE		native	
Castilleja affinis Hook. & Arn. subsp. litoralis (Pennell) T. I. Chuang & Heckard	OROBANCHACEAE	OREGON COAST PAINTBRUSH	native	
Castilleja affinis Hook. & Arn. subsp. neglecta (E. M. Zeile) T. I. Chuang & Heckard	OROBANCHACEAE	TIBURON PAINTBRUSH	native	
Castilleja ambigua Hook. & Arn.	OROBANCHACEAE	JOHNNY-NIP	native	
Castilleja ambigua Hook. & Arn. subsp. ambigua	OROBANCHACEAE		native	
Castilleja ambigua Hook. & Arn. subsp. humboldtiensis (D. D. Keck) T. I. Chuang & Heckard	OROBANCHACEAE	HUMBOLDT BAY OWL'S-CLOVER	native	
Castilleja ambigua Hook. & Arn. subsp. insalutata (Jeps.) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja ambigua Hook. & Arn. var. meadii J.M. Egger & J.A. Ruygt	OROBANCHACEAE		native	acceptance uncertain
Castilleja applegatei Fernald	OROBANCHACEAE		native	
Castilleja applegatei Fernald subsp. disticha (Eastw.) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja applegatei Fernald subsp. martinii (Abrams) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja applegatei Fernald subsp. pallida (Eastw.) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja applegatei Fernald subsp. pinetorum (Fernald) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja arachnoidea Greenm.	OROBANCHACEAE		native	
Castilleja attenuata (A. Gray) T. I. Chuang & Heckard	OROBANCHACEAE	VALLEY TASSELS	native	
Castilleja brevilobata Piper	OROBANCHACEAE	SHORT-LOBED PAINTBRUSH	native	
Castilleja brevistyla (Hoover) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja campestris (Benth.) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja campestris (Benth.) T. I. Chuang & Heckard subsp. campestris	OROBANCHACEAE		native	
Castilleja campestris (Benth.) T. I. Chuang & Heckard subsp. succulenta (Hoover) T. I. Chuang & Heckard	OROBANCHACEAE	SUCCULENT OWL'S-CLOVER	native	
Castilleja chromosa A. Nelson	OROBANCHACEAE	DESERT PAINTBRUSH	native	
Castilleja cinerea A. Gray	OROBANCHACEAE	ASH-GRAY PAINTBRUSH	native	
Castilleja densiflora (Benth.) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja densiflora (Benth.) T. I. Chuang & Heckard subsp. densiflora	OROBANCHACEAE		native	
Castilleja densiflora (Benth.) T. I. Chuang & Heckard subsp. gracilis (Benth.) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja densiflora (Benth.) T. I. Chuang & Heckard subsp. obispoensis (D. D. Keck) T. I. Chuang & Heckard	OROBANCHACEAE	SAN LUIS OBISPO OWL'S-CLOVER	native	
Castilleja exserta (A. Heller) T. I. Chuang & Heckard	OROBANCHACEAE	PURPLE OWL'S-CLOVER	native	
Castilleja exserta (A. Heller) T. I. Chuang & Heckard subsp. exserta	OROBANCHACEAE		native	
Castilleja exserta (A. Heller) T. I. Chuang & Heckard subsp. latifolia (S. Watson) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja exserta (A. Heller) T. I. Chuang & Heckard subsp. venusta (A. Heller) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja foliolosa Hook. & Arn.	OROBANCHACEAE	WOOLLY PAINTBRUSH	native	
Castilleja gleasoni Elmer	OROBANCHACEAE	MOUNT GLEASON PAINTBRUSH	native	
Castilleja grisea Dunkle	OROBANCHACEAE	SAN CLEMENTE ISLAND PAINTBRUSH	native	
Castilleja hololeuca Greene	OROBANCHACEAE	ISLAND PAINTBRUSH	native	
Castilleja lacera (Benth.) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja lasiorhyncha (A. Gray) T. I. Chuang & Heckard	OROBANCHACEAE	SAN BERNARDINO MOUNTAINS OWL'S-CLOVER	native	
Castilleja latifolia Hook. & Arn.	OROBANCHACEAE	MONTEREY COAST PAINTBRUSH	native	
Castilleja lemmonii A. Gray	OROBANCHACEAE		native	
Castilleja linariifolia Benth.	OROBANCHACEAE		native	
Castilleja lineariloba (Benth.) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja mendocinensis (Eastw.) Pennell	OROBANCHACEAE	MENDOCINO COAST PAINTBRUSH	native	
Castilleja miniata Douglas ex Hook.	OROBANCHACEAE		native	
Castilleja miniata Douglas ex Hook. subsp. elata (Piper) Munz	OROBANCHACEAE	SISKIYOU PAINTBRUSH	native	
Castilleja miniata Douglas ex Hook. subsp. miniata	OROBANCHACEAE		native	
Castilleja minor (A. Gray) A. Gray	OROBANCHACEAE		native	
Castilleja minor (A. Gray) A. Gray subsp. minor	OROBANCHACEAE		native	
Castilleja minor (A. Gray) A. Gray subsp. spiralis (Jeps.) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja mollis Pennell	OROBANCHACEAE	SOFT-LEAVED PAINTBRUSH	native	
Castilleja montigena Heckard	OROBANCHACEAE	HECKARD'S PAINTBRUSH	native	
Castilleja nana Eastw.	OROBANCHACEAE		native	
Castilleja peirsonii Eastw.	OROBANCHACEAE		native	
Castilleja pilosa (S. Watson) Rydb.	OROBANCHACEAE		native	
Castilleja plagiotoma A. Gray	OROBANCHACEAE	MOJAVE PAINTBRUSH	native	
Castilleja praeterita Heckard & Bacig.	OROBANCHACEAE		native	
Castilleja pruinosa Fernald	OROBANCHACEAE		native	
Castilleja rubicundula (Jeps.) T. I. Chuang & Heckard	OROBANCHACEAE	CREAM SACS	native	
Castilleja rubicundula (Jeps.) T. I. Chuang & Heckard subsp. lithospermoides (Benth.) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja rubicundula (Jeps.) T. I. Chuang & Heckard subsp. rubicundula	OROBANCHACEAE	PINK CREAMSACS	native	
Castilleja schizotricha Greenm.	OROBANCHACEAE	SPLIT-HAIR PAINTBRUSH	native	
Castilleja subinclusa Greene	OROBANCHACEAE		native	
Castilleja subinclusa Greene subsp. franciscana (Pennell) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja subinclusa Greene subsp. subinclusa	OROBANCHACEAE		native	
Castilleja tenuis (A. Heller) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Castilleja wightii Elmer	OROBANCHACEAE		native	
Catalpa bignonioides Walter	BIGNONIACEAE		naturalized	
Catalpa speciosa (Warder) Warder ex Engelm.	BIGNONIACEAE		naturalized	
Caulanthus amplexicaulis S. Watson	BRASSICACEAE		native	
Caulanthus anceps Payson	BRASSICACEAE		native	
Caulanthus californicus (S. Watson) Payson	BRASSICACEAE	CALIFORNIA JEWELFLOWER	native	
Caulanthus cooperi (S. Watson) Payson	BRASSICACEAE		native	
Caulanthus coulteri S. Watson	BRASSICACEAE		native	
Caulanthus coulteri S. Watson var. coulteri	BRASSICACEAE		native	
Caulanthus crassicaulis (Torr.) S. Watson	BRASSICACEAE	THICK-STEM WILD CABBAGE	native	
Caulanthus flavescens (Hook.) Payson	BRASSICACEAE		native	
Caulanthus glaucus S. Watson	BRASSICACEAE		native	
Caulanthus hallii Payson	BRASSICACEAE		native	
Caulanthus heterophyllus (Nutt.) Payson	BRASSICACEAE		native	
Caulanthus inflatus S. Watson	BRASSICACEAE	DESERT CANDLE	native	
Caulanthus lasiophyllus (Hook. & Arn.) Payson	BRASSICACEAE	CALIFORNIA MUSTARD	native	
Caulanthus lemmonii S. Watson	BRASSICACEAE	LEMMON'S JEWELFLOWER	native	
Caulanthus major (M. E. Jones) Payson	BRASSICACEAE		native	
Caulanthus pilosus S. Watson	BRASSICACEAE	CHOCOLATE DROPS	native	
Caulanthus simulans Payson	BRASSICACEAE	PAYSON'S JEWELFLOWER	native	
Ceanothus arboreus Greene	RHAMNACEAE	FELTLEAF CEANOTHUS	native	
Ceanothus arcuatus McMinn	RHAMNACEAE	ARCHING CEANOTHUS	native	
Ceanothus confusus J. T. Howell	RHAMNACEAE	RINCON RIDGE CEANOTHUS	native	
Ceanothus cordulatus Kellogg	RHAMNACEAE	MOUNTAIN WHITETHORN	native	
Ceanothus crassifolius Torr.	RHAMNACEAE	HOARYLEAF CEANOTHUS	native	
Ceanothus crassifolius Torr. var. crassifolius	RHAMNACEAE		native	
Ceanothus crassifolius Torr. var. planus Abrams	RHAMNACEAE		native	
Ceanothus cuneatus Nutt.	RHAMNACEAE		native	
Ceanothus cuneatus Nutt. var. cuneatus	RHAMNACEAE	BUCKBRUSH	native	
Ceanothus cuneatus Nutt. var. fascicularis (McMinn) Hoover	RHAMNACEAE	LOMPOC CEANOTHUS	native	
Ceanothus cuneatus Nutt. var. ramulosus Greene	RHAMNACEAE		native	
Ceanothus cyaneus Eastw.	RHAMNACEAE	LAKESIDE CEANOTHUS	native	
Ceanothus dentatus Torr. & A. Gray	RHAMNACEAE		native	
Ceanothus divergens Parry	RHAMNACEAE	CALISTOGA CEANOTHUS	native	
Ceanothus diversifolius Kellogg	RHAMNACEAE	PINE MAT	native	
Ceanothus ferrisiae McMinn	RHAMNACEAE	COYOTE CEANOTHUS	native	
Ceanothus foliosus Parry	RHAMNACEAE		native	
Ceanothus foliosus Parry var. foliosus	RHAMNACEAE	WAVYLEAF CEANOTHUS	native	
Ceanothus foliosus Parry var. medius McMinn	RHAMNACEAE	LA CUESTA CEANOTHUS	native	
Ceanothus foliosus Parry var. vineatus McMinn	RHAMNACEAE	VINE HILL CEANOTHUS	native	
Ceanothus fresnensis Abrams	RHAMNACEAE	FRESNO CEANOTHUS	native	
Ceanothus gloriosus J. T. Howell	RHAMNACEAE		native	
Ceanothus gloriosus J. T. Howell var. exaltatus J. T. Howell	RHAMNACEAE	GLORY BRUSH	native	
Ceanothus gloriosus J. T. Howell var. gloriosus	RHAMNACEAE	POINT REYES CEANOTHUS	native	
Ceanothus gloriosus J. T. Howell var. porrectus J. T. Howell	RHAMNACEAE	MOUNT VISION CEANOTHUS	native	
Ceanothus hearstiorum Hoover & Roof	RHAMNACEAE	HEARSTS' CEANOTHUS	native	
Ceanothus impressus Trel.	RHAMNACEAE		native	
Ceanothus impressus Trel. var. impressus	RHAMNACEAE		native	
Ceanothus impressus Trel. var. nipomensis McMinn	RHAMNACEAE		native	
Ceanothus incanus Torr. & A. Gray	RHAMNACEAE	COAST WHITETHORN	native	
Ceanothus integerrimus Hook. & Arn.	RHAMNACEAE	DEER BRUSH	native	
Ceanothus integerrimus Hook. & Arn. var. integerrimus	RHAMNACEAE		native	
Ceanothus integerrimus Hook. & Arn. var. macrothyrsus (Torr.) G. T. Benson	RHAMNACEAE		native	
Ceanothus jepsonii Greene	RHAMNACEAE	MUSK BRUSH	native	
Ceanothus lemmonii Parry	RHAMNACEAE		native	
Ceanothus leucodermis Greene	RHAMNACEAE	CHAPARRAL WHITETHORN	native	
Ceanothus maritimus Hoover	RHAMNACEAE	MARITIME CEANOTHUS	native	
Ceanothus masonii McMinn	RHAMNACEAE	MASON'S CEANOTHUS	native	
Ceanothus megacarpus Nutt.	RHAMNACEAE		native	
Ceanothus megacarpus Nutt. var. insularis (Eastw.) Munz	RHAMNACEAE	ISLAND CEANOTHUS	native	
Ceanothus megacarpus Nutt. var. megacarpus	RHAMNACEAE	BIGPOD CEANOTHUS	native	
Ceanothus oliganthus Nutt.	RHAMNACEAE		native	
Ceanothus oliganthus Nutt. var. oliganthus	RHAMNACEAE		native	
Ceanothus oliganthus Nutt. var. orcuttii (Parry) Jeps.	RHAMNACEAE		native	
Ceanothus oliganthus Nutt. var. sorediatus (Hook. & Arn.) Hoover	RHAMNACEAE	JIM BRUSH	native	
Ceanothus ophiochilus S. Boyd, T. S. Ross, & Arnseth	RHAMNACEAE	VAIL LAKE CEANOTHUS	native	
Ceanothus otayensis McMinn	RHAMNACEAE	OTAY MOUNTAIN CEANOTHUS	native	
Ceanothus palmeri Trel.	RHAMNACEAE	PALMER CEANOTHUS	native	
Ceanothus papillosus Torr. & A. Gray	RHAMNACEAE	WARTLEAF CEANOTHUS	native	
Ceanothus papillosus Torr. & A. Gray var. papillosus	RHAMNACEAE		native	
Ceanothus parryi Trel.	RHAMNACEAE		native	
Ceanothus parvifolius (S. Watson) Trel.	RHAMNACEAE		native	
Ceanothus perplexans Trel.	RHAMNACEAE		native	
Ceanothus pinetorum Coville	RHAMNACEAE	KERN CEANOTHUS	native	
Ceanothus prostratus Benth.	RHAMNACEAE		native	
Ceanothus prostratus Benth. var. occidentalis McMinn	RHAMNACEAE		native	
Ceanothus prostratus Benth. var. prostratus	RHAMNACEAE	MAHALA MAT	native	
Ceanothus pumilus Greene	RHAMNACEAE	SISKIYOU MAT	native	
Ceanothus purpureus Jeps.	RHAMNACEAE	HOLLY-LEAVED CEANOTHUS	native	
Ceanothus rigidus Nutt.	RHAMNACEAE		native	
Ceanothus roderickii W. Knight	RHAMNACEAE	PINE HILL CEANOTHUS	native	
Ceanothus sanguineus Pursh	RHAMNACEAE	REDSTEM CEANOTHUS	native	
Ceanothus sonomensis J. T. Howell	RHAMNACEAE	SONOMA CEANOTHUS	native	
Ceanothus spinosus Nutt.	RHAMNACEAE	GREENBARK CEANOTHUS	native	
Ceanothus thyrsiflorus Eschsch.	RHAMNACEAE		native	
Ceanothus thyrsiflorus Eschsch. var. griseus Trel.	RHAMNACEAE	CARMEL CEANOTHUS	native	
Ceanothus thyrsiflorus Eschsch. var. thyrsiflorus	RHAMNACEAE	BLUE BLOSSOM	native	
Ceanothus tomentosus Parry	RHAMNACEAE		native	
Ceanothus velutinus Douglas	RHAMNACEAE		native	
Ceanothus verrucosus Nutt.	RHAMNACEAE	WART-STEMMED CEANOTHUS	native	
Ceanothus vestitus Greene	RHAMNACEAE	MOJAVE CEANOTHUS	native	
Cedronella canariensis (L.) Willd. ex Webb & Berthel.	LAMIACEAE		naturalized	acceptance uncertain
Celtis australis L.	CANNABACEAE	NETTLE-TREE	naturalized	
Celtis reticulata Torr.	CANNABACEAE	NETLEAF HACKBERRY	native	
Celtis sinensis Pers.	CANNABACEAE	CHINESE HACKBERRY	naturalized	
Cenchrus echinatus L.	POACEAE	SOUTHERN SANDBUR	naturalized	
Cenchrus incertus M. A. Curtis	POACEAE	COMMON SANDBUR	naturalized	
Cenchrus longispinus (Hack.) Fernald	POACEAE	MAT SANDBUR	naturalized	
Centaurea benedicta (L.) L.	ASTERACEAE	BLESSED THISTLE	naturalized	
Centaurea biebersteinii DC.	ASTERACEAE		naturalized	acceptance uncertain
Centaurea calcitrapa L.	ASTERACEAE	PURPLE STAR-THISTLE	naturalized	
Centaurea cineraria L.	ASTERACEAE	DUSTY MILLER	naturalized	
Centaurea cyanus L.	ASTERACEAE	CORNFLOWER	naturalized	
Centaurea diffusa Lam.	ASTERACEAE	DIFFUSE KNAPWEED	naturalized	
Centaurea diluta Aiton	ASTERACEAE	NORTH AFRICAN KNAPWEED	naturalized	
Centaurea iberica Spreng.	ASTERACEAE	IBERIAN STAR-THISTLE	naturalized	
Centaurea jacea L.	ASTERACEAE		naturalized	
Centaurea jacea L. nothosubsp. pratensis (W.D.J. Koch) Čelak.	ASTERACEAE		naturalized	
Centaurea jacea L. subsp. jacea	ASTERACEAE	BROWN KNAPWEED	naturalized	
Centaurea jacea L. subsp. nigra (L.) Bonnier & Layens	ASTERACEAE	BLACK KNAPWEED	naturalized	
Centaurea melitensis L.	ASTERACEAE	TOCALOTE	naturalized	
Centaurea pouzinii DC.	ASTERACEAE	POUZIN'S STAR-THISTLE	naturalized	
Centaurea solstitialis L.	ASTERACEAE	YELLOW STAR-THISTLE	naturalized	
Centaurea stoebe L.	ASTERACEAE		naturalized	
Centaurea stoebe L. subsp. micranthos (Gugler) Hayek	ASTERACEAE	SPOTTED KNAPWEED	naturalized	
Centaurea sulphurea Willd.	ASTERACEAE	SICILIAN STAR-THISTLE	naturalized	
Centaurea virgata Lam.	ASTERACEAE		naturalized	
Centaurea virgata Lam. subsp. squarrosa (Boiss.) Gugler.	ASTERACEAE		naturalized	
Centaurium erythraea Rafn	GENTIANACEAE	EUROPEAN CENTAURY	naturalized	
Centaurium tenuiflorum (Hoffmanns. & Link) Janch.	GENTIANACEAE	SLENDER CENTAURY	naturalized	
Centranthus ruber (L.) DC.	VALERIANACEAE	RED VALERIAN	naturalized	
Centromadia fitchii (A. Gray) Greene	ASTERACEAE		native	
Centromadia parryi (Greene) Greene	ASTERACEAE		native	
Centromadia parryi (Greene) Greene subsp. australis (D. D. Keck) B. G. Baldwin	ASTERACEAE	SOUTHERN TARPLANT	native	
Centromadia parryi (Greene) Greene subsp. congdonii (B. L. Rob. & Greenm.) B. G. Baldwin	ASTERACEAE	CONGDON'S TARPLANT	native	
Centromadia parryi (Greene) Greene subsp. parryi	ASTERACEAE	PAPPOSE TARPLANT	native	
Centromadia parryi (Greene) Greene subsp. rudis (Greene) B. G. Baldwin	ASTERACEAE	PARRY'S ROUGH TARPLANT	native	
Centromadia pungens (Hook. & Arn.) Greene	ASTERACEAE		native	
Centromadia pungens (Hook. & Arn.) Greene subsp. laevis (D. D. Keck) B. G. Baldwin	ASTERACEAE	SMOOTH TARPLANT	native	
Centromadia pungens (Hook. & Arn.) Greene subsp. pungens	ASTERACEAE	COMMON SPIKEWEED	native	
Centrostegia thurberi A. Gray	POLYGONACEAE	RED TRIANGLES	native	
Cephalanthera austiniae (A. Gray) A. Heller	ORCHIDACEAE	PHANTOM ORCHID	native	
Cephalanthus occidentalis L.	RUBIACEAE	CALIFORNIA BUTTON WILLOW	native	
Cerastium arvense L.	CARYOPHYLLACEAE		native	
Cerastium arvense L. subsp. strictum Gaudin	CARYOPHYLLACEAE	FIELD MOUSE-EAR CHICKWEED	native	
Cerastium beeringianum Cham. & Schltdl.	CARYOPHYLLACEAE	BERING MOUSE-EAR CHICKWEED	native	
Cerastium dichotomum L.	CARYOPHYLLACEAE	FORKED MOUSE-EAR CHICKWEED	naturalized	
Cerastium diffusum Pers.	CARYOPHYLLACEAE	DARK GREEN MOUSE-EAR CHICKWEED	naturalized	
Cerastium fontanum Baumg.	CARYOPHYLLACEAE		naturalized	
Cerastium fontanum Baumg. subsp. vulgare (Hartm.) Greuter & Burdet	CARYOPHYLLACEAE	COMMON MOUSE-EAR CHICKWEED	naturalized	
Cerastium glomeratum Thuill.	CARYOPHYLLACEAE	STICKY MOUSE-EAR CHICKWEED	naturalized	
Cerastium viride A. Heller	CARYOPHYLLACEAE	WESTERN FIELD MOUSE-EAR CHICKWEED	native	
Ceratonia siliqua L.	FABACEAE		naturalized	
Ceratophyllum demersum L.	CERATOPHYLLACEAE		native	
Cercis occidentalis Torr. ex A. Gray	FABACEAE	WESTERN REDBUD	native	
Cercocarpus betuloides Nutt.	ROSACEAE		native	
Cercocarpus betuloides Nutt. var. betuloides	ROSACEAE	BIRCH-LEAF MOUNTAIN-MAHOGANY	native	
Cercocarpus betuloides Nutt. var. blancheae (C. K. Schneid.) Little	ROSACEAE	ISLAND MOUNTAIN-MAHOGANY	native	
Cercocarpus betuloides Nutt. var. macrourus (Rydb.) Jeps.	ROSACEAE		native	
Cercocarpus ledifolius Nutt.	ROSACEAE	CURL-LEAF MOUNTAIN-MAHOGANY	native	
Cercocarpus ledifolius Nutt. var. intermontanus N. H. Holmgren	ROSACEAE		native	
Cercocarpus ledifolius Nutt. var. intricatus (S. Watson) M.E. Jones	ROSACEAE		native	
Cercocarpus ledifolius Nutt. var. ledifolius	ROSACEAE		native	
Cercocarpus minutiflorus Abrams	ROSACEAE		native	
Cercocarpus traskiae Eastw.	ROSACEAE	CATALINA ISLAND MOUNTAIN-MAHOGANY	native	
Cestrum nocturnum L.	SOLANACEAE		naturalized	
Chaenactis alpigena Sharsm.	ASTERACEAE	SHARSMITH PINCUSHION	native	
Chaenactis artemisiifolia (Harv. & A. Gray) A. Gray	ASTERACEAE	WHITE PINCUSHION	native	
Chaenactis carphoclinia A. Gray	ASTERACEAE	PEBBLE PINCUSHION	native	
Chaenactis carphoclinia A. Gray var. carphoclinia	ASTERACEAE		native	
Chaenactis carphoclinia A. Gray var. peirsonii (Jeps.) Munz	ASTERACEAE	PEIRSON'S PINCUSHION	native	
Chaenactis douglasii (Hook.) Hook. & Arn.	ASTERACEAE		native	
Chaenactis douglasii (Hook.) Hook. & Arn. var. alpina A. Gray	ASTERACEAE	ALPINE DUSTY-MAIDENS	native	
Chaenactis douglasii (Hook.) Hook. & Arn. var. douglasii	ASTERACEAE	DUSTY-MAIDENS	native	
Chaenactis fremontii A. Gray	ASTERACEAE	FREMONT PINCUSHION	native	
Chaenactis glabriuscula DC.	ASTERACEAE	YELLOW PINCUSHION	native	
Chaenactis glabriuscula DC. var. glabriuscula	ASTERACEAE		native	
Chaenactis glabriuscula DC. var. heterocarpha (Torr. & A. Gray) H. M. Hall	ASTERACEAE	INNER COAST RANGE PINCUSHION	native	
Chaenactis glabriuscula DC. var. lanosa (DC.) H. M. Hall	ASTERACEAE	SAND BUTTONS	native	
Chaenactis glabriuscula DC. var. megacephala A. Gray	ASTERACEAE		native	
Chaenactis glabriuscula DC. var. orcuttiana (Greene) H. M. Hall	ASTERACEAE	ORCUTT'S PINCUSHION	native	
Chaenactis macrantha D. C. Eaton	ASTERACEAE	MOJAVE PINCUSHION	native	
Chaenactis nevadensis (Kellogg) A. Gray	ASTERACEAE	SIERRA PINCUSHION	native	
Chaenactis parishii A. Gray	ASTERACEAE	PARISH'S CHAENACTIS	native	
Chaenactis santolinoides Greene	ASTERACEAE	SANTOLINA PINCUSHION	native	
Chaenactis stevioides Hook. & Arn.	ASTERACEAE	DESERT PINCUSHION	native	
Chaenactis suffrutescens A. Gray	ASTERACEAE	SHASTA CHAENACTIS	native	
Chaenactis xantiana A. Gray	ASTERACEAE	FLESHY PINCUSHION	native	
Chaetadelpha wheeleri A. Gray ex S. Watson	ASTERACEAE	WHEELER'S DUNE-BROOM	native	
Chaetopappa ericoides (Torr.) G. L. Nesom	ASTERACEAE	ROSE-HEATH	native	
Chamaebatia australis (Brandegee) Abrams	ROSACEAE	SOUTHERN MOUNTAIN MISERY	native	
Chamaebatia foliolosa Benth.	ROSACEAE	MOUNTAIN MISERY	native	
Chamaebatiaria millefolium (Torr.) Maxim.	ROSACEAE		native	
Chamaecyparis lawsoniana (A. Murray bis) Parl.	CUPRESSACEAE	LAWSON CYPRESS	native	
Chamaecytisus proliferus (L. f.) Link	FABACEAE		naturalized	
Chamaemelum fuscatum (Brot.) Vasc.	ASTERACEAE	CHAMOMILE	naturalized	
Chamaesaracha coronopus (Dunal) A. Gray	SOLANACEAE		native	
Chamaesaracha nana (A. Gray) A. Gray	SOLANACEAE		native	
Chamerion angustifolium (L.) Holub	ONAGRACEAE		native	
Chamerion angustifolium (L.) Holub subsp. circumvagum (Mosquin) Hoch	ONAGRACEAE	FIREWEED	native	
Chamerion latifolium (L.) Holub	ONAGRACEAE		native	
Chasmanthe floribunda (Salisb.) N. E. Br.	IRIDACEAE		naturalized	
Cheilanthes clevelandii D. C. Eaton	PTERIDACEAE	CLEVELAND'S LIP FERN	native	
Cheilanthes cooperae D. C. Eaton	PTERIDACEAE	COOPER'S LIP FERN	native	
Cheilanthes covillei Maxon	PTERIDACEAE	COVILLE'S LIP FERN	native	
Cheilanthes feei T. Moore	PTERIDACEAE	SLENDER LIP FERN	native	
Cheilanthes gracillima D. C. Eaton	PTERIDACEAE	LACE LIP FERN	native	
Cheilanthes intertexta (Maxon) Maxon	PTERIDACEAE	COASTAL LIP FERN	native	
Cheilanthes newberryi (D. C. Eaton) Domin	PTERIDACEAE	NEWBERRY'S LIP FERN	native	
Cheilanthes parryi (D. C. Eaton) Domin	PTERIDACEAE	PARRY'S LIP FERN	native	
Cheilanthes viscida Davenp.	PTERIDACEAE	VISCID LACE FERN	native	
Cheilanthes wootonii Maxon	PTERIDACEAE	WOOTON'S LIP FERN	native	
Chenopodium album L.	CHENOPODIACEAE	LAMB'S QUARTERS	naturalized	
Chenopodium atrovirens Rydb.	CHENOPODIACEAE		native	
Chenopodium berlandieri Moq.	CHENOPODIACEAE	PITSEED GOOSEFOOT	native	
Chenopodium berlandieri Moq. var. sinuatum (Murr) Wahl	CHENOPODIACEAE		native	
Chenopodium berlandieri Moq. var. zschackei (Murr) Murr ex Graebn.	CHENOPODIACEAE		native	
Chenopodium californicum (S. Watson) S. Watson	CHENOPODIACEAE	CALIFORNIA GOOSEFOOT	native	
Chenopodium capitatum (L.) Ambrosi	CHENOPODIACEAE	STRAWBERRY-BLITE	native	
Chenopodium capitatum (L.) Ambrosi var. capitatum	CHENOPODIACEAE		naturalized	
Chenopodium capitatum (L.) Ambrosi var. parvicapitatum S. L. Welsh	CHENOPODIACEAE		native	
Chenopodium chenopodioides (L.) Aellen	CHENOPODIACEAE		naturalized	
Chenopodium desiccatum A. Nelson	CHENOPODIACEAE		native	
Chenopodium foliosum (Moench) Asch.	CHENOPODIACEAE		naturalized	
Chenopodium fremontii S. Watson	CHENOPODIACEAE		native	
Chenopodium glaucum L.	CHENOPODIACEAE		native	
Chenopodium glaucum L. var. salinum (Standl.) B. Boivin	CHENOPODIACEAE		native	
Chenopodium hians Standl.	CHENOPODIACEAE		native	
Chenopodium incanum (S. Watson) A. Heller	CHENOPODIACEAE		native	
Chenopodium incanum (S. Watson) A. Heller var. occidentale D. J. Crawford	CHENOPODIACEAE		native	
Chenopodium leptophyllum (Moq.) Nutt. ex S. Watson	CHENOPODIACEAE		native	
Chenopodium littoreum Benet-Pierce & M.G. Simpson	CHENOPODIACEAE		native	
Chenopodium macrospermum Hook. f.	CHENOPODIACEAE		naturalized	
Chenopodium missouriense Aellen	CHENOPODIACEAE		naturalized	
Chenopodium murale L.	CHENOPODIACEAE		naturalized	
Chenopodium nevadense Standl.	CHENOPODIACEAE		native	
Chenopodium pratericola Rydb.	CHENOPODIACEAE		native	
Chenopodium rubrum L.	CHENOPODIACEAE	RED PIGWEED	native	
Chenopodium rubrum L. var. humile (Hook.) S. Watson	CHENOPODIACEAE		native	
Chenopodium rubrum L. var. rubrum	CHENOPODIACEAE		native	
Chenopodium simplex (Torr.) Raf.	CHENOPODIACEAE	LARGE-SEEDED GOOSEFOOT	native	
Chenopodium strictum Roth	CHENOPODIACEAE		naturalized	
Chenopodium strictum Roth var. glaucophyllum (Aellen) Wahl	CHENOPODIACEAE		naturalized	
Chenopodium vulvaria L.	CHENOPODIACEAE		naturalized	
Chenopodium watsonii A. Nelson	CHENOPODIACEAE		native	
Chilopsis linearis (Cav.) Sweet	BIGNONIACEAE		native	
Chilopsis linearis (Cav.) Sweet subsp. arcuata (Fosberg) Henrickson	BIGNONIACEAE		native	
Chimaphila menziesii (R. Br. ex D. Don) Spreng.	ERICACEAE	LITTLE PRINCE'S PINE	native	
Chimaphila umbellata (L.) W. P. C. Barton	ERICACEAE	PRINCE'S PINE	native	
Chloracantha spinosa (Benth.) G. L. Nesom	ASTERACEAE		native	
Chloracantha spinosa (Benth.) G. L. Nesom var. spinosa	ASTERACEAE		native	
Chloris gayana Kunth	POACEAE	RHODES GRASS	naturalized	
Chloris truncata R. Br.	POACEAE	BLACK WINDMILL GRASS	naturalized	
Chloris verticillata Nutt.	POACEAE	WINDMILL GRASS	naturalized	
Chloris virgata Sw.	POACEAE	FEATHER FINGER GRASS	naturalized	
Chlorogalum angustifolium Kellogg	AGAVACEAE		native	
Chlorogalum grandiflorum Hoover	AGAVACEAE	RED HILLS SOAPROOT	native	
Chlorogalum parviflorum S. Watson	AGAVACEAE		native	
Chlorogalum pomeridianum (DC.) Kunth	AGAVACEAE		native	
Chlorogalum pomeridianum (DC.) Kunth var. divaricatum (Lindl.) Hoover	AGAVACEAE		native	
Chlorogalum pomeridianum (DC.) Kunth var. minus Hoover	AGAVACEAE	DWARF SOAPROOT	native	
Chlorogalum pomeridianum (DC.) Kunth var. pomeridianum	AGAVACEAE		native	
Chlorogalum purpureum Brandegee	AGAVACEAE		native	
Chlorogalum purpureum Brandegee var. purpureum	AGAVACEAE	SANTA LUCIA PURPLE AMOLE	native	
Chlorogalum purpureum Brandegee var. reductum Hoover	AGAVACEAE	CAMATTA CANYON AMOLE	native	
Chloropyron maritimum (Nutt. ex Benth.) A. Heller	OROBANCHACEAE		native	
Chloropyron maritimum (Nutt. ex Benth.) A. Heller subsp. canescens (A. Gray) Tank & J.M. Egger	OROBANCHACEAE		native	
Chloropyron maritimum (Nutt. ex Benth.) A. Heller subsp. maritimum	OROBANCHACEAE	SALT MARSH BIRD'S-BEAK	native	
Chloropyron maritimum (Nutt. ex Benth.) A. Heller subsp. palustre (Behr) Tank & J.M. Egger	OROBANCHACEAE	POINT REYES SALTY BIRD'S-BEAK	native	
Chloropyron molle (A. Gray) A. Heller	OROBANCHACEAE		native	
Chloropyron molle (A. Gray) A. Heller subsp. hispidum (Pennell) Tank & J.M. Egger	OROBANCHACEAE	HISPID SALTY BIRD'S-BEAK	native	
Chloropyron molle (A. Gray) A. Heller subsp. molle	OROBANCHACEAE	SOFT SALTY BIRD'S-BEAK	native	
Chloropyron palmatum (Ferris) Tank & J.M. Egger	OROBANCHACEAE	PALMATE SALTY BIRD'S-BEAK	native	
Chloropyron tecopense (Munz & J.C. Roos) Tank & J.M. Egger	OROBANCHACEAE	TECOPA SALTY BIRD'S-BEAK	native	
Chondrilla juncea L.	ASTERACEAE	SKELETON WEED	naturalized	
Chorispora tenella (Pall.) DC.	BRASSICACEAE		naturalized	
Chorizanthe angustifolia Nutt.	POLYGONACEAE	NARROW-LEAF SPINEFLOWER	native	
Chorizanthe biloba Goodman	POLYGONACEAE		native	
Chorizanthe biloba Goodman var. biloba	POLYGONACEAE	TWO-LOBE SPINEFLOWER	native	
Chorizanthe biloba Goodman var. immemora Reveal & Hardham	POLYGONACEAE	HERNANDEZ SPINEFLOWER	native	
Chorizanthe blakleyi Hardham	POLYGONACEAE	BLAKLEY'S SPINEFLOWER	native	
Chorizanthe brevicornu Torr.	POLYGONACEAE		native	
Chorizanthe brevicornu Torr. var. brevicornu	POLYGONACEAE	BRITTLE SPINEFLOWER	native	
Chorizanthe brevicornu Torr. var. spathulata (Rydb.) C. L. Hitchc.	POLYGONACEAE	GREAT BASIN BRITTLE SPINEFLOWER	native	
Chorizanthe breweri S. Watson	POLYGONACEAE	BREWER'S SPINEFLOWER	native	
Chorizanthe clevelandii Parry	POLYGONACEAE	CLEVELAND'S SPINEFLOWER	native	
Chorizanthe corrugata (Torr.) Torr. & A. Gray	POLYGONACEAE	WRINKLED SPINEFLOWER	native	
Chorizanthe cuspidata S. Watson	POLYGONACEAE		native	
Chorizanthe cuspidata S. Watson var. cuspidata	POLYGONACEAE	SAN FRANCISCO BAY SPINEFLOWER	native	
Chorizanthe cuspidata S. Watson var. villosa (Eastw.) Munz	POLYGONACEAE	WOOLLY-HEADED SPINEFLOWER	native	
Chorizanthe diffusa Benth.	POLYGONACEAE	DIFFUSE SPINEFLOWER	native	
Chorizanthe douglasii Benth.	POLYGONACEAE	DOUGLAS' SPINEFLOWER	native	
Chorizanthe fimbriata Nutt.	POLYGONACEAE		native	
Chorizanthe fimbriata Nutt. var. fimbriata	POLYGONACEAE	FRINGED SPINEFLOWER	native	
Chorizanthe fimbriata Nutt. var. laciniata (Torr.) Jeps.	POLYGONACEAE	LACINIATE SPINEFLOWER	native	
Chorizanthe howellii Goodman	POLYGONACEAE	HOWELL'S SPINEFLOWER	native	
Chorizanthe leptotheca Goodman	POLYGONACEAE	PENINSULAR SPINEFLOWER	native	
Chorizanthe membranacea Benth.	POLYGONACEAE	PINK SPINEFLOWER	native	
Chorizanthe obovata Goodman	POLYGONACEAE	SPOON-SEPAL SPINEFLOWER	native	
Chorizanthe orcuttiana Parry	POLYGONACEAE	ORCUTT'S SPINEFLOWER	native	
Chorizanthe palmeri S. Watson	POLYGONACEAE	PALMER'S SPINEFLOWER	native	
Chorizanthe parryi S. Watson	POLYGONACEAE		native	
Chorizanthe parryi S. Watson var. fernandina (S. Watson) Jeps.	POLYGONACEAE	SAN FERNANDO VALLEY SPINEFLOWER	native	
Chorizanthe parryi S. Watson var. parryi	POLYGONACEAE	PARRY'S SPINEFLOWER	native	
Chorizanthe polygonoides Torr. & A. Gray	POLYGONACEAE		native	
Chorizanthe polygonoides Torr. & A. Gray var. longispina (Goodman) Munz	POLYGONACEAE	LONG-SPINED SPINEFLOWER	native	
Chorizanthe polygonoides Torr. & A. Gray var. polygonoides	POLYGONACEAE	KNOTWEED SPINEFLOWER	native	
Chorizanthe procumbens Nutt.	POLYGONACEAE	PROSTRATE SPINEFLOWER	native	
Chorizanthe pungens Benth.	POLYGONACEAE		native	
Chorizanthe pungens Benth. var. hartwegiana Reveal & Hardham	POLYGONACEAE	BEN LOMOND SPINEFLOWER	native	
Chorizanthe pungens Benth. var. pungens	POLYGONACEAE	MONTEREY SPINEFLOWER	native	
Chorizanthe rectispina Goodman	POLYGONACEAE	STRAIGHT-AWNED SPINEFLOWER	native	
Chorizanthe rigida (Torr.) Torr. & A. Gray	POLYGONACEAE	DEVIL'S SPINEFLOWER	native	
Chorizanthe robusta Parry	POLYGONACEAE		native	
Chorizanthe robusta Parry var. hartwegii (Benth.) Reveal & Rand. Morgan	POLYGONACEAE	SCOTTS VALLEY SPINEFLOWER	native	
Chorizanthe robusta Parry var. robusta	POLYGONACEAE	ROBUST SPINEFLOWER	native	
Chorizanthe spinosa S. Watson	POLYGONACEAE	MOJAVE SPINEFLOWER	native	
Chorizanthe staticoides Benth.	POLYGONACEAE	TURKISH RUGGING	native	
Chorizanthe stellulata Benth.	POLYGONACEAE	STARLITE SPINEFLOWER	native	
Chorizanthe uniaristata Torr. & A. Gray	POLYGONACEAE	ONE-AWN SPINEFLOWER	native	
Chorizanthe valida S. Watson	POLYGONACEAE	SONOMA SPINEFLOWER	native	
Chorizanthe ventricosa Goodman	POLYGONACEAE	POTBELLIED SPINEFLOWER	native	
Chorizanthe watsonii Torr. & A. Gray	POLYGONACEAE	WATSON'S SPINEFLOWER	native	
Chorizanthe wheeleri S. Watson	POLYGONACEAE	WHEELER'S SPINEFLOWER	native	
Chorizanthe xanti S. Watson	POLYGONACEAE		native	
Chorizanthe xanti S. Watson var. leucotheca Goodman	POLYGONACEAE	WHITE-BRACTED SPINEFLOWER	native	
Chorizanthe xanti S. Watson var. xanti	POLYGONACEAE	PINYON SPINEFLOWER	native	
Chrysanthemoides monilifera (L.) Norl.	ASTERACEAE		naturalized	
Chrysanthemoides monilifera (L.) Norl. subsp. monilifera	ASTERACEAE	BITOU BUSH	naturalized	
Chrysolepis chrysophylla (Hook.) Hjelmq.	FAGACEAE	GIANT CHINQUAPIN	native	
Chrysolepis chrysophylla (Hook.) Hjelmq. var. chrysophylla	FAGACEAE		native	
Chrysolepis chrysophylla (Hook.) Hjelmq. var. minor (Benth.) Munz	FAGACEAE		native	
Chrysolepis sempervirens (Kellogg) Hjelmq.	FAGACEAE	BUSH CHINQUAPIN	native	
Chrysosplenium glechomifolium Nutt.	SAXIFRAGACEAE		native	
Chrysothamnus depressus Nutt.	ASTERACEAE		native	
Chrysothamnus greenei (A. Gray) Greene	ASTERACEAE	GREENE'S RABBITBRUSH	native	
Chrysothamnus humilis Greene	ASTERACEAE		native	
Chrysothamnus viscidiflorus (Hook.) Nutt.	ASTERACEAE	YELLOW RABBITBRUSH	native	
Chrysothamnus viscidiflorus (Hook.) Nutt. subsp. axillaris (D. D. Keck) L. C. Anderson	ASTERACEAE		native	
Chrysothamnus viscidiflorus (Hook.) Nutt. subsp. lanceolatus (Nutt.) H. M. Hall & Clem.	ASTERACEAE		native	
Chrysothamnus viscidiflorus (Hook.) Nutt. subsp. puberulus (D.C. Eaton) H. M. Hall & Clem.	ASTERACEAE		native	
Chrysothamnus viscidiflorus (Hook.) Nutt. subsp. viscidiflorus	ASTERACEAE		native	
Chylismia arenaria A. Nelson	ONAGRACEAE		native	
Chylismia brevipes (A. Gray) Small	ONAGRACEAE		native	
Chylismia brevipes (A. Gray) Small subsp. arizonica (P.H. Raven) W.L. Wagner & Hoch	ONAGRACEAE		native	
Chylismia brevipes (A. Gray) Small subsp. brevipes	ONAGRACEAE		native	
Chylismia brevipes (A. Gray) Small subsp. pallidula (Munz) W.L. Wagner & Hoch	ONAGRACEAE		native	
Chylismia cardiophylla (Torr.) Small	ONAGRACEAE		native	
Chylismia cardiophylla (Torr.) Small subsp. cardiophylla	ONAGRACEAE		native	
Chylismia cardiophylla (Torr.) Small subsp. robusta (P.H. Raven) W.L. Wagner & Hoch	ONAGRACEAE		native	
Chylismia claviformis (Torr. & Frém.) A. Heller	ONAGRACEAE		native	
Chylismia claviformis (Torr. & Frém.) A. Heller subsp. aurantiaca (Munz) W.L. Wagner & Hoch	ONAGRACEAE		native	
Chylismia claviformis (Torr. & Frém.) A. Heller subsp. claviformis	ONAGRACEAE		native	
Chylismia claviformis (Torr. & Frém.) A. Heller subsp. funerea (P.H. Raven) W.L. Wagner & Hoch	ONAGRACEAE		native	
Chylismia claviformis (Torr. & Frém.) A. Heller subsp. integrior (P.H. Raven) W.L. Wagner & Hoch	ONAGRACEAE		native	
Chylismia claviformis (Torr. & Frém.) A. Heller subsp. lancifolia (A. Heller) W.L. Wagner & Hoch	ONAGRACEAE		native	
Chylismia claviformis (Torr. & Frém.) A. Heller subsp. peirsonii (Munz) W.L. Wagner & Hoch	ONAGRACEAE		native	
Chylismia claviformis (Torr. & Frém.) A. Heller subsp. subsp. cruciformis (Kellogg) W.L. Wagner & Hoch	ONAGRACEAE		native	
Chylismia claviformis (Torr. & Frém.) A. Heller subsp. yumae (P.H. Raven) W.L. Wagner & Hoch	ONAGRACEAE		native	
Chylismia heterochroma (S. Watson) Small	ONAGRACEAE	SHOCKLEY'S EVENING-PRIMROSE	native	
Chylismia munzii (P.H. Raven) W.L. Wagner & Hoch	ONAGRACEAE		native	
Chylismia walkeri A. Nelson	ONAGRACEAE		native	
Chylismia walkeri A. Nelson subsp. tortilis (Jeps.) W.L. Wagner & Hoch	ONAGRACEAE		native	
Chylismiella pterosperma (S. Watson) W.L. Wagner & Hoch	ONAGRACEAE		native	
Cicendia quadrangularis (Lam.) Griseb.	GENTIANACEAE	TIMWORT	native	
Cichorium intybus L.	ASTERACEAE		naturalized	
Cicuta douglasii (DC.) J. M. Coult. & Rose	APIACEAE		native	
Cicuta maculata L.	APIACEAE		native	
Cicuta maculata L. var. angustifolia Hook.	APIACEAE		native	
Cicuta maculata L. var. bolanderi (S. Watson) G. A. Mulligan	APIACEAE	BOLANDER'S WATER-HEMLOCK	native	
Cinna bolanderi Scribn.	POACEAE	BOLANDER'S WOODREED	native	
Cinna latifolia (Trevir. ex Göpp.) Griseb.	POACEAE	SLENDER WOODREED	native	
Cinnamomum camphora (L.) J. Presl	LAURACEAE	CAMPHOR TREE	naturalized	
Circaea alpina L.	ONAGRACEAE		native	
Circaea alpina L. subsp. pacifica (Asch. & Magnus) P. H. Raven	ONAGRACEAE		native	
Cirsium andersonii (A. Gray) Petr.	ASTERACEAE		native	
Cirsium andrewsii (A. Gray) Jeps.	ASTERACEAE	FRANCISCAN THISTLE	native	
Cirsium arizonicum (A. Gray) Petr.	ASTERACEAE		native	
Cirsium arizonicum (A. Gray) Petr. var. arizonicum	ASTERACEAE	ARIZONA THISTLE	native	
Cirsium arizonicum (A. Gray) Petr. var. tenuisectum D. J. Keil	ASTERACEAE	DESERT MOUNTAIN THISTLE	native	
Cirsium arvense (L.) Scop.	ASTERACEAE	CANADA THISTLE	naturalized	
Cirsium brevistylum Cronquist	ASTERACEAE		native	
Cirsium canescens Nutt.	ASTERACEAE	PRAIRIE THISTLE	naturalized	
Cirsium ciliolatum (L. F. Hend.) J. T. Howell	ASTERACEAE	ASHLAND THISTLE	native	
Cirsium crassicaule (Greene) Jeps.	ASTERACEAE	SLOUGH THISTLE	native	
Cirsium cymosum (Greene) J. T. Howell	ASTERACEAE		native	
Cirsium cymosum (Greene) J. T. Howell var. canovirens (Rydb.) D.J. Keil	ASTERACEAE	GRAY-GREEN THISTLE	native	
Cirsium cymosum (Greene) J. T. Howell var. cymosum	ASTERACEAE	PEREGRINE THISTLE	native	
Cirsium douglasii DC.	ASTERACEAE	SWAMP THISTLE	native	
Cirsium douglasii DC. var. breweri (A. Gray) D. J. Keil & C. E. Turner	ASTERACEAE		native	
Cirsium douglasii DC. var. douglasii	ASTERACEAE		native	
Cirsium fontinale (Greene) Jeps.	ASTERACEAE	FOUNTAIN THISTLE	native	
Cirsium fontinale (Greene) Jeps. var. campylon (H. Sharsm.) D. J. Keil & C. E. Turner	ASTERACEAE	MOUNT HAMILTON FOUNTAIN THISTLE	native	
Cirsium fontinale (Greene) Jeps. var. fontinale	ASTERACEAE	CRYSTAL SPRINGS FOUNTAIN THISTLE	native	
Cirsium fontinale (Greene) Jeps. var. obispoense J. T. Howell	ASTERACEAE	SAN LUIS OBISPO FOUNTAIN THISTLE	native	
Cirsium hydrophilum (Greene) Jeps.	ASTERACEAE		native	
Cirsium hydrophilum (Greene) Jeps. var. hydrophilum	ASTERACEAE	SUISUN THISTLE	native	
Cirsium hydrophilum (Greene) Jeps. var. vaseyi (A. Gray) J. T. Howell	ASTERACEAE	MOUNT TAMALPAIS THISTLE	native	
Cirsium inamoenum (Greene) D. J. Keil	ASTERACEAE		native	
Cirsium inamoenum (Greene) D. J. Keil var. inamoenum	ASTERACEAE	GREENE'S THISTLE	native	
Cirsium mohavense (Greene) Petr.	ASTERACEAE	MOJAVE THISTLE	native	
Cirsium neomexicanum A. Gray	ASTERACEAE	DESERT THISTLE	native	
Cirsium occidentale (Nutt.) Jeps.	ASTERACEAE		native	
Cirsium occidentale (Nutt.) Jeps. var. californicum (A. Gray) D. J. Keil & C. E. Turner	ASTERACEAE	CALIFORNIA THISTLE	native	
Cirsium occidentale (Nutt.) Jeps. var. candidissimum (Greene) J. F. Macbr.	ASTERACEAE	SNOWY THISTLE	native	
Cirsium occidentale (Nutt.) Jeps. var. compactum Hoover	ASTERACEAE	COMPACT COBWEBBY THISTLE	native	
Cirsium occidentale (Nutt.) Jeps. var. coulteri Harv. & A. Gray) Jeps.	ASTERACEAE	COULTER'S THISTLE	native	
Cirsium occidentale (Nutt.) Jeps. var. lucianum D. J. Keil	ASTERACEAE	CUESTA RIDGE THISTLE	native	
Cirsium occidentale (Nutt.) Jeps. var. occidentale	ASTERACEAE	COBWEBBY THISTLE	native	
Cirsium occidentale (Nutt.) Jeps. var. venustum (Greene) Jeps.	ASTERACEAE	VENUS THISTLE	native	
Cirsium ochrocentrum A. Gray	ASTERACEAE		naturalized	
Cirsium ochrocentrum A. Gray var. ochrocentrum	ASTERACEAE	YELLOWSPINE THISTLE	naturalized	
Cirsium quercetorum (A. Gray) Jeps.	ASTERACEAE	BROWNIE THISTLE	native	
Cirsium remotifolium (Hook.) DC.	ASTERACEAE		native	
Cirsium remotifolium (Hook.) DC. var. odontolepis Petr.	ASTERACEAE	PACIFIC FRINGED THISTLE	native	
Cirsium remotifolium (Hook.) DC. var. remotifolium	ASTERACEAE	REMOTE-LEAVED THISTLE	native	
Cirsium remotifolium (Hook.) DC. var. rivulare Jeps.	ASTERACEAE	KLAMATH THISTLE	native	
Cirsium rhothophilum S. F. Blake	ASTERACEAE	SURF THISTLE	native	
Cirsium scariosum Nutt.	ASTERACEAE	MEADOW THISTLE	native	
Cirsium scariosum Nutt. var. americanum (A. Gray) D.J. Keil	ASTERACEAE	DINNERPLATE THISTLE	native	
Cirsium scariosum Nutt. var. citrinum (Petr.) D.J. Keil	ASTERACEAE	SOUTHERN MEADOW THISTLE	native	
Cirsium scariosum Nutt. var. congdonii (R. J. Moore & Frankton) D. J. Keil	ASTERACEAE	ROSETTE THISTLE	native	
Cirsium scariosum Nutt. var. loncholepis (Petr.) D.J. Keil	ASTERACEAE	LA GRACIOSA THISTLE	native	
Cirsium scariosum Nutt. var. robustum D. J. Keil	ASTERACEAE	SHASTA VALLEY THISTLE	native	
Cirsium scariosum Nutt. var. scariosum	ASTERACEAE	ELK THISTLE	native	
Cirsium undulatum (Nutt.) Spreng.	ASTERACEAE	WAVYLEAF THISTLE	native	
Cirsium vulgare (Savi) Ten.	ASTERACEAE	BULL THISTLE	naturalized	
Cistanthe ambigua (S. Watson) Carolin ex Hershk.	MONTIACEAE	DESERT CISTANTHE	native	
Cistanthe maritima (Nutt.) Hershk.	MONTIACEAE	SEASIDE CISTANTHE	native	
Cistus incanus L.	CISTACEAE		naturalized	
Cistus ladanifer L.	CISTACEAE	GUM CISTUS	naturalized	
Cistus monspeliensis L.	CISTACEAE		naturalized	
Cistus salviifolius L.	CISTACEAE		naturalized	
Citrullus lanatus (Thunb.) Matsum. & Nakai	CUCURBITACEAE		naturalized	
Citrullus lanatus (Thunb.) Matsum. & Nakai var. citroides (L. H. Bailey) Mansf.	CUCURBITACEAE	WILD WATERMELON	naturalized	
Cladium californicum (S. Watson) O'Neill	CYPERACEAE	CALIFORNIA SAWGRASS	native	
Clarkia affinis H. Lewis & M. Lewis	ONAGRACEAE		native	
Clarkia amoena (Lehm.) A. Nelson & J. F. Macbr.	ONAGRACEAE	FAREWELL-TO-SPRING	native	
Clarkia amoena (Lehm.) A. Nelson & J. F. Macbr. subsp. amoena	ONAGRACEAE		native	
Clarkia amoena (Lehm.) A. Nelson & J. F. Macbr. subsp. huntiana (Jeps.) H. Lewis & M. Lewis	ONAGRACEAE		native	
Clarkia amoena (Lehm.) A. Nelson & J. F. Macbr. subsp. whitneyi (A. Gray) H. Lewis & M. Lewis	ONAGRACEAE	WHITNEY'S FAREWELL-TO-SPRING	native	
Clarkia arcuata (Kellogg) A. Nelson & J. F. Macbr.	ONAGRACEAE		native	
Clarkia australis E. Small	ONAGRACEAE	SMALL'S SOUTHERN CLARKIA	native	
Clarkia biloba (Durand) A. Nelson & J. F. Macbr.	ONAGRACEAE		native	
Clarkia biloba (Durand) A. Nelson & J. F. Macbr. subsp. australis H. Lewis & M. Lewis	ONAGRACEAE	MARIPOSA CLARKIA	native	
Clarkia biloba (Durand) A. Nelson & J. F. Macbr. subsp. biloba	ONAGRACEAE		native	
Clarkia biloba (Durand) A. Nelson & J. F. Macbr. subsp. brandegeeae (Jeps.) H. Lewis & M. Lewis	ONAGRACEAE	BRANDEGEE'S CLARKIA	native	
Clarkia borealis E. Small	ONAGRACEAE		native	
Clarkia borealis E. Small subsp. arida E. Small	ONAGRACEAE	SHASTA CLARKIA	native	
Clarkia borealis E. Small subsp. borealis	ONAGRACEAE	NORTHERN CLARKIA	native	
Clarkia bottae (Spach) H. Lewis & M. Lewis	ONAGRACEAE	PUNCHBOWL GODETIA	native	
Clarkia breweri (A. Gray) Greene	ONAGRACEAE	BREWER'S CLARKIA	native	
Clarkia concinna (Fisch. & C. A. Mey.) Greene	ONAGRACEAE	RED RIBBONS	native	
Clarkia concinna (Fisch. & C. A. Mey.) Greene subsp. automixa R. N. Bowman	ONAGRACEAE	SANTA CLARA RED RIBBONS	native	
Clarkia concinna (Fisch. & C. A. Mey.) Greene subsp. concinna	ONAGRACEAE		native	
Clarkia concinna (Fisch. & C. A. Mey.) Greene subsp. raichei G. A. Allen, V. S. Ford, & Gottlieb	ONAGRACEAE	RAICHE'S RED RIBBONS	native	
Clarkia cylindrica (Jeps.) H. Lewis & M. Lewis	ONAGRACEAE		native	
Clarkia cylindrica (Jeps.) H. Lewis & M. Lewis subsp. clavicarpa W. S. Davis	ONAGRACEAE		native	
Clarkia cylindrica (Jeps.) H. Lewis & M. Lewis subsp. cylindrica	ONAGRACEAE		native	
Clarkia davyi (Jeps.) H. Lewis & M. Lewis	ONAGRACEAE		native	
Clarkia delicata (Abrams) A. Nelson & J. F. Macbr.	ONAGRACEAE	DELICATE CLARKIA	native	
Clarkia dudleyana (Abrams) J. F. Macbr.	ONAGRACEAE		native	
Clarkia epilobioides (Nutt. ex Torr. & A. Gray) A. Nelson & J. F. Macbr.	ONAGRACEAE		native	
Clarkia exilis H. Lewis & Vasek	ONAGRACEAE	SLENDER CLARKIA	native	
Clarkia franciscana H. Lewis & P. H. Raven	ONAGRACEAE	PRESIDIO CLARKIA	native	
Clarkia gracilis (Piper) A. Nelson & J. F. Macbr.	ONAGRACEAE		native	
Clarkia gracilis (Piper) A. Nelson & J. F. Macbr. subsp. albicaulis (Jeps.) H. Lewis & M. Lewis	ONAGRACEAE	WHITE-STEMMED CLARKIA	native	
Clarkia gracilis (Piper) A. Nelson & J. F. Macbr. subsp. gracilis	ONAGRACEAE		native	
Clarkia gracilis (Piper) A. Nelson & J. F. Macbr. subsp. sonomensis (C. L. Hitchc.) H. Lewis & M. Lewis	ONAGRACEAE		native	
Clarkia gracilis (Piper) A. Nelson & J. F. Macbr. subsp. tracyi (Jeps.) Abdel-Hameed & R. Snow	ONAGRACEAE	TRACY'S CLARKIA	native	
Clarkia heterandra (Torr.) H. Lewis & P. H. Raven	ONAGRACEAE		native	
Clarkia imbricata H. Lewis & M. Lewis	ONAGRACEAE	VINE HILL CLARKIA	native	
Clarkia jolonensis D. R. Parn.	ONAGRACEAE	JOLON CLARKIA	native	
Clarkia lassenensis (Eastw.) H. Lewis & M. Lewis	ONAGRACEAE		native	
Clarkia lewisii P. H. Raven & D. R. Parn.	ONAGRACEAE	LEWIS' CLARKIA	native	
Clarkia lingulata H. Lewis & M. Lewis	ONAGRACEAE	MERCED CLARKIA	native	
Clarkia mildrediae (A. Heller) H. Lewis & M. Lewis	ONAGRACEAE		native	
Clarkia mildrediae (A. Heller) H. Lewis & M. Lewis subsp. lutescens Gottlieb & Janeway	ONAGRACEAE	GOLDEN-ANTHERED CLARKIA	native	
Clarkia mildrediae (A. Heller) H. Lewis & M. Lewis subsp. mildrediae	ONAGRACEAE	MILDRED'S CLARKIA	native	
Clarkia modesta Jeps.	ONAGRACEAE		native	
Clarkia mosquinii E. Small	ONAGRACEAE	MOSQUIN'S CLARKIA	native	
Clarkia prostrata H. Lewis & M. Lewis	ONAGRACEAE		native	
Clarkia purpurea (Curtis) A. Nelson & J. F. Macbr.	ONAGRACEAE		native	
Clarkia purpurea (Curtis) A. Nelson & J. F. Macbr. subsp. purpurea	ONAGRACEAE		native	
Clarkia purpurea (Curtis) A. Nelson & J. F. Macbr. subsp. quadrivulnera (Douglas ex Lindl.) H. Lewis & M. Lewis	ONAGRACEAE	FOUR-SPOT	native	
Clarkia purpurea (Curtis) A. Nelson & J. F. Macbr. subsp. viminea (Douglas ex Hook.) H. Lewis & M. Lewis	ONAGRACEAE		native	
Clarkia rhomboidea Douglas	ONAGRACEAE		native	
Clarkia rostrata W. S. Davis	ONAGRACEAE	BEAKED CLARKIA	native	
Clarkia rubicunda (Lindl.) H. Lewis & M. Lewis	ONAGRACEAE		native	
Clarkia similis H. Lewis & W. R. Ernst	ONAGRACEAE		native	
Clarkia speciosa H. Lewis & M. Lewis	ONAGRACEAE		native	
Clarkia speciosa H. Lewis & M. Lewis subsp. immaculata H. Lewis & M. Lewis	ONAGRACEAE	PISMO CLARKIA	native	
Clarkia speciosa H. Lewis & M. Lewis subsp. nitens (H. Lewis & M. Lewis) H. Lewis & P. H. Raven	ONAGRACEAE		native	
Clarkia speciosa H. Lewis & M. Lewis subsp. polyantha H. Lewis & M. Lewis	ONAGRACEAE		native	
Clarkia speciosa H. Lewis & M. Lewis subsp. speciosa	ONAGRACEAE		native	
Clarkia springvillensis Vasek	ONAGRACEAE	SPRINGVILLE CLARKIA	native	
Clarkia stellata Mosquin	ONAGRACEAE		native	
Clarkia tembloriensis Vasek	ONAGRACEAE		native	
Clarkia tembloriensis Vasek subsp. calientensis (Vasek) K. E. Hols.	ONAGRACEAE	VASEK'S CLARKIA	native	
Clarkia tembloriensis Vasek subsp. tembloriensis	ONAGRACEAE		native	
Clarkia unguiculata Lindl.	ONAGRACEAE		native	
Clarkia virgata Greene	ONAGRACEAE	SIERRA CLARKIA	native	
Clarkia williamsonii (Durand & Hilg.) H. Lewis & M. Lewis	ONAGRACEAE		native	
Clarkia xantiana A. Gray	ONAGRACEAE		native	
Clarkia xantiana A. Gray subsp. parviflora (Eastw.) H. Lewis & P. H. Raven	ONAGRACEAE	KERN CANYON CLARKIA	native	
Clarkia xantiana A. Gray subsp. xantiana	ONAGRACEAE		native	
Claytonia cordifolia S. Watson	MONTIACEAE		native	
Claytonia exigua Torr. & A. Gray	MONTIACEAE		native	
Claytonia exigua Torr. & A. Gray subsp. exigua	MONTIACEAE		native	
Claytonia exigua Torr. & A. Gray subsp. glauca (Torr. & A. Gray) John M. Mill. & K. L. Chambers	MONTIACEAE		native	
Claytonia gypsophiloides Fisch. & C. A. Mey.	MONTIACEAE		native	
Claytonia lanceolata Pursh	MONTIACEAE	WESTERN SPRING BEAUTY	native	
Claytonia megarhiza (A. Gray) S. Watson	MONTIACEAE	FELL-FIELDS CLAYTONIA	native	
Claytonia nevadensis S. Watson	MONTIACEAE		native	
Claytonia palustris Swanson & Kelley	MONTIACEAE	MARSH CLAYTONIA	native	
Claytonia parviflora Hook.	MONTIACEAE		native	
Claytonia parviflora Hook. subsp. grandiflora John M. Mill. & K. L. Chambers	MONTIACEAE	STREAMBANK SPRING BEAUTY	native	
Claytonia parviflora Hook. subsp. parviflora	MONTIACEAE		native	
Claytonia parviflora Hook. subsp. utahensis (Rydb.) John M. Mill. & K. L. Chambers	MONTIACEAE		native	
Claytonia parviflora Hook. subsp. viridis (Davidson) John M. Mill. & K. L. Chambers	MONTIACEAE		native	
Claytonia perfoliata Donn ex Willd.	MONTIACEAE	MINER'S LETTUCE	native	
Claytonia perfoliata Donn ex Willd. subsp. intermontana John M. Mill. & K. L. Chambers	MONTIACEAE		native	
Claytonia perfoliata Donn ex Willd. subsp. mexicana (Rydb.) John M. Mill. & K. L. Chambers	MONTIACEAE		native	
Claytonia perfoliata Donn ex Willd. subsp. perfoliata	MONTIACEAE		native	
Claytonia rubra (Howell) Tidestr.	MONTIACEAE		native	
Claytonia rubra (Howell) Tidestr. subsp. depressa (A. Gray) John M. Mill. & K. L. Chambers	MONTIACEAE		native	
Claytonia rubra (Howell) Tidestr. subsp. rubra	MONTIACEAE		native	
Claytonia saxosa Brandegee	MONTIACEAE		native	
Claytonia sibirica L.	MONTIACEAE	CANDY FLOWER	native	
Claytonia umbellata S. Watson	MONTIACEAE	GREAT BASIN CLAYTONIA	native	
Claytonia washingtoniana (Suksd.) Suksd.	MONTIACEAE		native	
Clematis lasiantha Nutt.	RANUNCULACEAE	PIPESTEM CLEMATIS	native	
Clematis ligusticifolia Nutt.	RANUNCULACEAE	WESTERN VIRGIN'S BOWER	native	
Clematis pauciflora Nutt.	RANUNCULACEAE	FEW-FLOWERED CLEMATIS	native	
Cleomella brevipes S. Watson	CLEOMACEAE	SHORT-PEDICELLED CLEOMELLA	native	
Cleomella hillmanii A. Nelson	CLEOMACEAE		native	
Cleomella hillmanii A. Nelson var. hillmanii	CLEOMACEAE	HILLMAN'S CLEOMELLA	native	
Cleomella obtusifolia Torr. & Frém.	CLEOMACEAE	MOJAVE STINKWEED	native	
Cleomella parviflora A. Gray	CLEOMACEAE		native	
Cleomella plocasperma S. Watson	CLEOMACEAE		native	
Clinopodium chandleri (Brandegee) P. D. Cantino & Wagstaff	LAMIACEAE	SAN MIGUEL SAVORY	native	
Clinopodium douglasii (Benth.) Kuntze	LAMIACEAE	YERBA BUENA	native	
Clinopodium mimuloides (Benth.) Kuntze	LAMIACEAE	MONKEY-FLOWER SAVORY	native	
Clintonia andrewsiana Torr.	LILIACEAE		native	
Clintonia uniflora (Menzies ex Schult. & Schult. f.) Kunth	LILIACEAE		native	
Cneoridium dumosum (Nutt. ex Torr. & A. Gray) Baill.	RUTACEAE	BUSHRUE	native	
Cochlearia groenlandica L.	BRASSICACEAE	GREENLAND COCHLEARIA	native	
Coincya monensis (L.) Greuter & Burdet	BRASSICACEAE		naturalized	
Coincya monensis (L.) Greuter & Burdet subsp. recurvata (All.) Leadlay	BRASSICACEAE	STAR MUSTARD	naturalized	
Coleogyne ramosissima Torr.	ROSACEAE		native	
Collinsia antonina Hardham	PLANTAGINACEAE	SAN ANTONIO COLLINSIA	native	
Collinsia bartsiifolia Benth.	PLANTAGINACEAE		native	
Collinsia bartsiifolia Benth. var. bartsiifolia	PLANTAGINACEAE		native	
Collinsia bartsiifolia Benth. var. davidsonii (Parish) Newsom	PLANTAGINACEAE		native	
Collinsia bartsiifolia Benth. var. stricta (Greene) Newsom	PLANTAGINACEAE		native	
Collinsia callosa Parish	PLANTAGINACEAE		native	
Collinsia childii A. Gray	PLANTAGINACEAE		native	
Collinsia concolor Greene	PLANTAGINACEAE		native	
Collinsia corymbosa Herder	PLANTAGINACEAE	ROUND-HEADED CHINESE-HOUSES	native	
Collinsia grandiflora Lindl.	PLANTAGINACEAE		native	
Collinsia greenei A. Gray	PLANTAGINACEAE		native	
Collinsia heterophylla Buist ex Graham	PLANTAGINACEAE		native	
Collinsia heterophylla Buist ex Graham var. austromontana (Newsom) Munz	PLANTAGINACEAE	DOWNY CHINESE-HOUSES	native	
Collinsia heterophylla Buist ex Graham var. heterophylla	PLANTAGINACEAE	CHINESE-HOUSES	native	
Collinsia linearis A. Gray	PLANTAGINACEAE		native	
Collinsia multicolor Lindl. & Paxton	PLANTAGINACEAE	SAN FRANCISCO COLLINSIA	native	
Collinsia parryi A. Gray	PLANTAGINACEAE		native	
Collinsia parviflora Lindl.	PLANTAGINACEAE	BLUE-EYED MARY	native	
Collinsia rattanii A. Gray	PLANTAGINACEAE		native	
Collinsia sparsiflora Fisch. & C. A. Mey.	PLANTAGINACEAE		native	
Collinsia sparsiflora Fisch. & C. A. Mey. var. collina (Jeps.) Newsom	PLANTAGINACEAE		native	
Collinsia sparsiflora Fisch. & C. A. Mey. var. sparsiflora	PLANTAGINACEAE		native	
Collinsia tinctoria Benth.	PLANTAGINACEAE		native	
Collinsia torreyi A. Gray	PLANTAGINACEAE		native	
Collinsia torreyi A. Gray var. brevicarinata Newsom	PLANTAGINACEAE		native	
Collinsia torreyi A. Gray var. latifolia Newsom	PLANTAGINACEAE		native	
Collinsia torreyi A. Gray var. torreyi	PLANTAGINACEAE		native	
Collinsia torreyi A. Gray var. wrightii (S. Watson) I. M. Johnst.	PLANTAGINACEAE		native	
Collomia diversifolia Greene	POLEMONIACEAE	SERPENTINE COLLOMIA	native	
Collomia grandiflora Douglas ex Lindl.	POLEMONIACEAE	LARGE-FLOWERED COLLOMIA	native	
Collomia heterophylla Hook.	POLEMONIACEAE	VARIABLE-LEAF COLLOMIA	native	
Collomia larsenii (A. Gray) Payson	POLEMONIACEAE	TALUS COLLOMIA	native	
Collomia linearis Nutt.	POLEMONIACEAE	NARROW-LEAF MOUNTAIN TRUMPET	native	
Collomia rawsoniana Greene	POLEMONIACEAE	RAWSON'S FLAMING-TRUMPET	native	
Collomia tenella A. Gray	POLEMONIACEAE	SLENDER COLLOMIA	native	
Collomia tinctoria Kellogg	POLEMONIACEAE	STAINING COLLOMIA	native	
Collomia tracyi H. Mason	POLEMONIACEAE	TRACY'S COLLOMIA	native	
Colubrina californica I. M. Johnst.	RHAMNACEAE	LAS ANIMAS COLUBRINA	native	
Colutea arborescens L.	FABACEAE		naturalized	
Comandra umbellata (L.) Nutt.	COMANDRACEAE		native	
Comandra umbellata (L.) Nutt. subsp. californica (Eastw. ex Rydb.) Piehl	COMANDRACEAE		native	
Comarostaphylis diversifolia (Parry) Greene	ERICACEAE		native	
Comarostaphylis diversifolia (Parry) Greene subsp. diversifolia	ERICACEAE	SUMMER HOLLY	native	
Comarostaphylis diversifolia (Parry) Greene subsp. planifolia (Jeps.) G. D. Wallace	ERICACEAE		native	
Comarum palustre L.	ROSACEAE	MARSH CINQUEFOIL	native	
Comastoma tenellum (Rottb.) Toyok.	GENTIANACEAE	SAMILAND GENTIAN	native	
Commelina benghalensis L.	COMMELINACEAE	TROPICAL SPIDERWORT	naturalized	
Condalia globosa I. M. Johnst.	RHAMNACEAE		native	
Condalia globosa I. M. Johnst. var. pubescens I. M. Johnst.	RHAMNACEAE	SPINY ABROJO	native	
Condea emoryi (Torr.) Harley & J.F.B. Pastore	LAMIACEAE		native	
Conicosia pugioniformis (L.) N. E. Br.	AIZOACEAE	NARROWLEAF ICEPLANT	naturalized	
Conioselinum pacificum (S. Watson) J. M. Coult. & Rose	APIACEAE		native	
Conium maculatum L.	APIACEAE		naturalized	
Conringia orientalis (L.) Dumort.	BRASSICACEAE		naturalized	
Consolida ajacis (L.) Schur	RANUNCULACEAE		naturalized	
Constancea nevinii (A. Gray) B. G. Baldwin	ASTERACEAE	NEVIN'S WOOLLY SUNFLOWER	native	
Convolvulus arvensis L.	CONVOLVULACEAE	ORCHARD MORNING-GLORY	naturalized	
Convolvulus simulans L. M. Perry	CONVOLVULACEAE	SMALL-FLOWERED MORNING-GLORY	native	
Coptis laciniata A. Gray	RANUNCULACEAE	OREGON GOLDTHREAD	native	
Corallorhiza maculata (Raf.) Raf.	ORCHIDACEAE	SPOTTED CORALROOT	native	
Corallorhiza maculata (Raf.) Raf. var. maculata	ORCHIDACEAE		native	
Corallorhiza maculata (Raf.) Raf. var. occidentalis (Lindl.) Ames	ORCHIDACEAE		native	
Corallorhiza mertensiana Bong.	ORCHIDACEAE	WESTERN CORALROOT	native	
Corallorhiza striata Lindl.	ORCHIDACEAE	STRIPED CORALROOT	native	
Corallorhiza trifida Châum;tel.	ORCHIDACEAE	NORTHERN CORALROOT	native	
Cordylanthus capitatus Nutt. ex Benth.	OROBANCHACEAE	YAKIMA BIRD'S-BEAK	native	
Cordylanthus eremicus (Coville & C. V. Morton) Munz	OROBANCHACEAE		native	
Cordylanthus eremicus (Coville & C. V. Morton) Munz subsp. eremicus	OROBANCHACEAE	DESERT BIRD'S-BEAK	native	
Cordylanthus eremicus (Coville & C. V. Morton) Munz subsp. kernensis T. I. Chuang & Heckard	OROBANCHACEAE	KERN PLATEAU BIRD'S-BEAK	native	
Cordylanthus kingii S. Watson	OROBANCHACEAE		native	
Cordylanthus kingii S. Watson subsp. helleri (Ferris) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Cordylanthus nevinii A. Gray	OROBANCHACEAE		native	
Cordylanthus nidularius J. T. Howell	OROBANCHACEAE	MOUNT DIABLO BIRD'S-BEAK	native	
Cordylanthus parviflorus (Ferris) Wiggins	OROBANCHACEAE	SMALL-FLOWERED BIRD'S-BEAK	native	
Cordylanthus pilosus A. Gray	OROBANCHACEAE		native	
Cordylanthus pilosus A. Gray subsp. hansenii (Ferris) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Cordylanthus pilosus A. Gray subsp. pilosus	OROBANCHACEAE		native	
Cordylanthus pilosus A. Gray subsp. trifidus (B. L. Rob. & Greenm.) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Cordylanthus pringlei A. Gray	OROBANCHACEAE		native	
Cordylanthus ramosus Nutt. ex Benth.	OROBANCHACEAE		native	
Cordylanthus rigidus (Benth.) Jeps.	OROBANCHACEAE		native	
Cordylanthus rigidus (Benth.) Jeps. subsp. brevibracteatus (A. Gray) Munz	OROBANCHACEAE	SHORT-BRACTED BIRD'S-BEAK	native	
Cordylanthus rigidus (Benth.) Jeps. subsp. littoralis (Ferris) T. I. Chuang & Heckard	OROBANCHACEAE	SEASIDE BIRD'S-BEAK	native	
Cordylanthus rigidus (Benth.) Jeps. subsp. rigidus	OROBANCHACEAE		native	
Cordylanthus rigidus (Benth.) Jeps. subsp. setigerus T. I. Chuang & Heckard	OROBANCHACEAE		native	
Cordylanthus tenuis A. Gray	OROBANCHACEAE		native	
Cordylanthus tenuis A. Gray subsp. barbatus T. I. Chuang & Heckard	OROBANCHACEAE	FRESNO COUNTY BIRD'S-BEAK	native	
Cordylanthus tenuis A. Gray subsp. brunneus (Jeps.) Munz	OROBANCHACEAE	SERPENTINE BIRD'S-BEAK	native	
Cordylanthus tenuis A. Gray subsp. capillaris (Pennell) T. I. Chuang & Heckard	OROBANCHACEAE	PENNELL'S BIRD'S-BEAK	native	
Cordylanthus tenuis A. Gray subsp. pallescens (Pennell) T. I. Chuang & Heckard	OROBANCHACEAE	PALLID BIRD'S-BEAK	native	
Cordylanthus tenuis A. Gray subsp. tenuis	OROBANCHACEAE		native	
Cordylanthus tenuis A. Gray subsp. viscidus (Howell) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Cordyline australis (G. Forst.) Endl.	LAXMANNIACEAE	NEW ZEALAND CABBAGE TREE	naturalized	
Coreopsis lanceolata L.	ASTERACEAE	GARDEN COREOPSIS	naturalized	
Coreopsis tinctoria Nutt.	ASTERACEAE	CALLIOPSIS	naturalized	
Corethrogyne filaginifolia (Hook. & Arn.) Nutt.	ASTERACEAE		native	
Coriandrum sativum L.	APIACEAE	CILANTRO	naturalized	
Corispermum americanum (Nutt.) Nutt.	CHENOPODIACEAE		native	
Corispermum americanum (Nutt.) Nutt. var. americanum	CHENOPODIACEAE	AMERICAN BUGSEED	native	
Cornus canadensis L.	CORNACEAE	BUNCHBERRY	native	
Cornus glabrata Benth.	CORNACEAE		native	
Cornus nuttallii Audubon	CORNACEAE	MOUNTAIN DOGWOOD	native	
Cornus sericea L.	CORNACEAE	AMERICAN DOGWOOD	native	
Cornus sericea L. subsp. occidentalis (Torr. & A. Gray) Fosberg	CORNACEAE		native	
Cornus sericea L. subsp. sericea	CORNACEAE		native	
Cornus sessilis Torr.	CORNACEAE		native	
Coronilla varia L.	FABACEAE	CROWN VETCH	naturalized	
Cortaderia jubata (Lemoine) Stapf	POACEAE		naturalized	
Cortaderia selloana (Schult. & Schult. f.) Asch. & Graebn.	POACEAE	PAMPAS GRASS	naturalized	
Corydalis aurea Willd.	PAPAVERACEAE	GOLDEN CORYDALIS	native	
Corydalis caseana A. Gray	PAPAVERACEAE		native	
Corydalis caseana A. Gray subsp. caseana	PAPAVERACEAE	FITWEED	native	
Corylus cornuta Marshall	BETULACEAE		native	
Corylus cornuta Marshall subsp. californica (A. DC.) E. Murray	BETULACEAE	CALIFORNIA HAZEL	native	
Coryphantha alversonii (J. M. Coult.) Orcutt	CACTACEAE	FOXTAIL CACTUS	native	
Coryphantha chlorantha (Engelm.) Britton & Rose	CACTACEAE	DESERT PINCUSHION	native	
Coryphantha vivipara (Nutt.) Britton & Rose	CACTACEAE		native	
Coryphantha vivipara (Nutt.) Britton & Rose var. rosea (Clokey) L. D. Benson	CACTACEAE	VIVIPAROUS FOXTAIL CACTUS	native	
Cosmos bipinnatus Cav.	ASTERACEAE	GARDEN COSMOS	naturalized	
Cotoneaster franchetii Bois	ROSACEAE	FRANCHET'S COTONEASTER	naturalized	
Cotoneaster frigidus Wall. ex Lindl.	ROSACEAE	TREE COTONEASTER	naturalized	
Cotoneaster hodjingensis G. Klotz	ROSACEAE	EARTHQUAKE COTONEASTER	naturalized	
Cotoneaster horizontalis Decne.	ROSACEAE	HERRINGBONE COTONEASTER	naturalized	
Cotoneaster integrifolius (Roxb.) G. Klotz	ROSACEAE	ENTIRE-LEAVED COTONEASTER	naturalized	
Cotoneaster lacteus W. W. Sm.	ROSACEAE	LATE COTONEASTER	naturalized	
Cotoneaster pannosus Franch.	ROSACEAE	SILVERLEAF COTONEASTER	naturalized	
Cotoneaster simonsii Baker	ROSACEAE	HIMALAYAN COTONEASTER	naturalized	
Cotula australis (Sieber ex Spreng.) Hook. f.	ASTERACEAE	AUSTRALIAN COTULA	naturalized	
Cotula coronopifolia L.	ASTERACEAE	BRASS-BUTTONS	naturalized	
Cotyledon orbiculata L.	CRASSULACEAE		naturalized	
Cotyledon orbiculata L. var. oblonga (Haw.) DC.	CRASSULACEAE		naturalized	
Crassula aquatica (L.) Schönl.	CRASSULACEAE		native	
Crassula colligata Toelken	CRASSULACEAE		naturalized	
Crassula colligata Toelken subsp. lamprosperma Toelken	CRASSULACEAE		naturalized	
Crassula connata (Ruiz & Pav.) A. Berger	CRASSULACEAE	PYGMY-WEED	native	
Crassula solieri (Gay) F. Meigen	CRASSULACEAE		native	
Crassula tetragona L.	CRASSULACEAE	CHINESE PINE-TREE	naturalized	
Crassula tillaea Lest.-Garl.	CRASSULACEAE		naturalized	
Crataegus castlegarensis J. B. Phipps & O'Kennon	ROSACEAE		native	
Crataegus douglasii Lindl.	ROSACEAE		native	
Crataegus gaylussacia A. Heller	ROSACEAE		native	
Crataegus monogyna Jacq.	ROSACEAE		naturalized	
Crepis acuminata Nutt.	ASTERACEAE		native	
Crepis bakeri Greene	ASTERACEAE		native	
Crepis bakeri Greene subsp. bakeri	ASTERACEAE		native	
Crepis bakeri Greene subsp. cusickii (Eastw.) Babc. & Stebbins	ASTERACEAE		native	
Crepis bakeri Greene subsp. idahoensis Babc. & Stebbins	ASTERACEAE		native	
Crepis capillaris (L.) Wallr.	ASTERACEAE		naturalized	
Crepis intermedia A. Gray	ASTERACEAE		native	
Crepis modocensis Greene	ASTERACEAE		native	
Crepis modocensis Greene subsp. modocensis	ASTERACEAE		native	
Crepis modocensis Greene subsp. subacaulis (Kellogg) Babc. & Stebbins	ASTERACEAE		native	
Crepis monticola Coville	ASTERACEAE		native	
Crepis nana Richardson	ASTERACEAE		native	
Crepis occidentalis Nutt.	ASTERACEAE		native	
Crepis occidentalis Nutt. subsp. conjuncta Babc. & Stebbins	ASTERACEAE		native	
Crepis occidentalis Nutt. subsp. costata (A. Gray) Babc. & Stebbins	ASTERACEAE		native	
Crepis occidentalis Nutt. subsp. occidentalis	ASTERACEAE		native	
Crepis occidentalis Nutt. subsp. pumila (Rydb.) Babc. & Stebbins	ASTERACEAE		native	
Crepis pleurocarpa A. Gray	ASTERACEAE		native	
Crepis runcinata (E. James) Torr. & A. Gray	ASTERACEAE		native	
Crepis runcinata (E. James) Torr. & A. Gray subsp. andersonii (A. Gray) Babc. & Stebbins	ASTERACEAE		native	
Crepis runcinata (E. James) Torr. & A. Gray subsp. hallii Babc. & Stebbins	ASTERACEAE	HALL'S MEADOW HAWKSBEARD	native	
Crepis setosa Haller f.	ASTERACEAE		naturalized	
Crepis tectorum L.	ASTERACEAE		naturalized	
Crepis vesicaria L.	ASTERACEAE		naturalized	
Crepis vesicaria L. subsp. taraxacifolia (Thuill.) Thell.	ASTERACEAE		naturalized	
Cressa truxillensis Kunth	CONVOLVULACEAE	ALKALI WEED	native	
Crocanthemum aldersonii (Greene) Janch.	CISTACEAE		native	
Crocanthemum greenei (B.L. Rob.) Sorrie	CISTACEAE		native	
Crocanthemum scoparium (Nutt.) Millsp.	CISTACEAE		native	
Crocanthemum scoparium (Nutt.) Millsp. var. scoparium	CISTACEAE		native	
Crocanthemum scoparium (Nutt.) Millsp. var. vulgare (Jeps.) Sorrie	CISTACEAE		native	
Crocanthemum suffrutescens (B. Schreib.) Sorrie	CISTACEAE		native	
Crocidium multicaule Hook.	ASTERACEAE		native	
Crocosmia X crocosmiiflora (Lemoine) N. E. Br.	IRIDACEAE		naturalized	
Crossosoma bigelovii S. Watson	CROSSOSOMATACEAE		native	
Crossosoma californicum Nutt.	CROSSOSOMATACEAE	CATALINA CROSSOSOMA	native	
Croton californicus Müll. Arg.	EUPHORBIACEAE		native	
Croton setiger Hook.	EUPHORBIACEAE	TURKEY-MULLEIN	native	
Croton wigginsii L. C. Wheeler	EUPHORBIACEAE	WIGGINS' CROTON	native	
Crucianella angustifolia L.	RUBIACEAE		naturalized	
Crupina vulgaris Pers. ex Cass.	ASTERACEAE	BEARDED CREEPER	naturalized	
Crypsis alopecuroides (Piller & Mitterp.) Schrad.	POACEAE	FOXTAIL PRICKLE GRASS	naturalized	
Crypsis schoenoides (L.) Lam.	POACEAE	SWAMP PRICKLE GRASS	naturalized	
Crypsis vaginiflora (Forssk.) Opiz	POACEAE	MODEST PRICKLE GRASS	naturalized	
Cryptantha affinis (A. Gray) Greene	BORAGINACEAE	SIDE-GROOVED CRYPTANTHA	native	
Cryptantha ambigua (A. Gray) Greene	BORAGINACEAE	WILKES' CRYPTANTHA	native	
Cryptantha angustifolia (Torr.) Greene	BORAGINACEAE	NARROW-LEAVED CRYPTANTHA	native	
Cryptantha barbigera (A. Gray) Greene	BORAGINACEAE		native	
Cryptantha barbigera (A. Gray) Greene var. barbigera	BORAGINACEAE	BEARDED CRYPTANTHA	native	
Cryptantha barbigera (A. Gray) Greene var. fergusoniae J.F. Macbr.	BORAGINACEAE	PALM SPRINGS CRYPTANTHA	native	
Cryptantha celosioides (Eastw.) Payson	BORAGINACEAE	COCKS-COMB CAT'S-EYE	native	
Cryptantha cinerea (Greene) Cronquist	BORAGINACEAE		native	
Cryptantha cinerea (Greene) Cronquist var. abortiva (Greene) Cronquist	BORAGINACEAE	BOW-NUT CRYPTANTHA	native	
Cryptantha circumscissa (Hook. & Arn.) I. M. Johnst.	BORAGINACEAE		native	
Cryptantha circumscissa (Hook. & Arn.) I. M. Johnst. var. circumscissa	BORAGINACEAE	CUSHION CRYPTANTHA	native	
Cryptantha circumscissa (Hook. & Arn.) I. M. Johnst. var. rosulata J. T. Howell	BORAGINACEAE	ROSETTE CUSHION CRYPTANTHA	native	
Cryptantha clevelandii Greene	BORAGINACEAE		native	
Cryptantha clevelandii Greene var. clevelandii	BORAGINACEAE	CLEVELAND'S CRYPTANTHA	native	
Cryptantha clevelandii Greene var. florosa I. M. Johnst.	BORAGINACEAE	COASTAL CRYPTANTHA	native	
Cryptantha clokeyi I. M. Johnst.	BORAGINACEAE	CLOKEY'S CRYPTANTHA	native	
Cryptantha confertiflora (Greene) Payson	BORAGINACEAE	YELLOW-FLOWERED CRYPTANTHA	native	
Cryptantha corollata (I. M. Johnst.) I. M. Johnst.	BORAGINACEAE	COAST RANGE CRYPTANTHA	native	
Cryptantha costata Brandegee	BORAGINACEAE	RIBBED CRYPTANTHA	native	
Cryptantha crinita Greene	BORAGINACEAE	SILKY CRYPTANTHA	native	
Cryptantha crymophila I. M. Johnst.	BORAGINACEAE	SUBALPINE CRYPTANTHA	native	
Cryptantha decipiens (M. E. Jones) A. Heller	BORAGINACEAE	GRAVEL CRYPTANTHA	native	
Cryptantha dissita I. M. Johnst.	BORAGINACEAE	LAKE CRYPTANTHA	native	
Cryptantha dumetorum (A. Gray) Greene	BORAGINACEAE	SCRAMBLING CRYPTANTHA	native	
Cryptantha echinella Greene	BORAGINACEAE	HEDGEHOG CRYPTANTHA	native	
Cryptantha excavata Brandegee	BORAGINACEAE	DEEP-SCARRED CRYPTANTHA	native	
Cryptantha fendleri (A. Gray) Greene	BORAGINACEAE	SANDDUNE CRYPTANTHA	native	
Cryptantha flaccida (Lehm.) Greene	BORAGINACEAE	PALE CRYPTANTHA	native	
Cryptantha flavoculata (A. Nelson) Payson	BORAGINACEAE	YELLOW-EYED CRYPTANTHA	native	
Cryptantha ganderi I. M. Johnst.	BORAGINACEAE	GANDER'S CRYPTANTHA	native	
Cryptantha glomeriflora Greene	BORAGINACEAE	CLUSTERED-FLOWER CRYPTANTHA	native	
Cryptantha gracilis Osterh.	BORAGINACEAE	SLENDER CRYPTANTHA	native	
Cryptantha hispidula Brand	BORAGINACEAE	NAPA CRYPTANTHA	native	
Cryptantha hoffmannii I. M. Johnst.	BORAGINACEAE	WHITE MOUNTAINS CRYPTANTHA	native	
Cryptantha holoptera (A. Gray) J. F. Macbr.	BORAGINACEAE	WINGED CRYPTANTHA	native	
Cryptantha hooveri I. M. Johnst.	BORAGINACEAE	HOOVER'S CRYPTANTHA	native	
Cryptantha humilis (A. Gray) Payson	BORAGINACEAE	LOW CRYPTANTHA	native	
Cryptantha inaequata I. M. Johnst.	BORAGINACEAE	PANAMINT CRYPTANTHA	native	
Cryptantha incana Greene	BORAGINACEAE	TULARE CRYPTANTHA	native	
Cryptantha intermedia (A. Gray) Greene	BORAGINACEAE		native	
Cryptantha intermedia (A. Gray) Greene var. hendersonii (A. Nelson) Jeps. & Hoover	BORAGINACEAE	HENDERSON'S CRYPTANTHA	native	
Cryptantha intermedia (A. Gray) Greene var. intermedia	BORAGINACEAE		native	
Cryptantha leiocarpa (Fisch. & C. A. Mey.) Greene	BORAGINACEAE	BEACH CRYPTANTHA	native	
Cryptantha mariposae I. M. Johnst.	BORAGINACEAE	MARIPOSA CRYPTANTHA	native	
Cryptantha maritima (Greene) Greene	BORAGINACEAE	GUADALUPE CRYPTANTHA	native	
Cryptantha micrantha (Torr.) I. M. Johnst.	BORAGINACEAE		native	
Cryptantha micrantha (Torr.) I. M. Johnst. var. lepida (A. Gray) I. M. Johnst.	BORAGINACEAE	MOUNTAIN RED-ROOT CRYPTANTHA	native	
Cryptantha micrantha (Torr.) I. M. Johnst. var. micrantha	BORAGINACEAE	RED-ROOT CRYPTANTHA	native	
Cryptantha micromeres (A. Gray) Greene	BORAGINACEAE	MINUTE-FLOWERED CRYPTANTHA	native	
Cryptantha microstachys (A. Gray) Greene	BORAGINACEAE	TEJON CRYPTANTHA	native	
Cryptantha milobakeri I. M. Johnst.	BORAGINACEAE	MILO BAKER'S CRYPTANTHA	native	
Cryptantha mohavensis (Greene) Greene	BORAGINACEAE	MOJAVE CRYPTANTHA	native	
Cryptantha muricata (Hook. & Arn.) A. Nelson & J. F. Macbr.	BORAGINACEAE		native	
Cryptantha muricata (Hook. & Arn.) A. Nelson & J. F. Macbr. var. denticulata (Greene) I. M. Johnst.	BORAGINACEAE	PRICKLY-NUT CRYPTANTHA	native	
Cryptantha muricata (Hook. & Arn.) A. Nelson & J. F. Macbr. var. jonesii (A. Gray) I. M. Johnst.	BORAGINACEAE	JONES' CRYPTANTHA	native	
Cryptantha muricata (Hook. & Arn.) A. Nelson & J. F. Macbr. var. muricata	BORAGINACEAE	SHOWY PRICKLY-NUT CRYPTANTHA	native	
Cryptantha nemaclada Greene	BORAGINACEAE	COLUSA CRYPTANTHA	native	
Cryptantha nevadensis A. Nelson & P. B. Kenn.	BORAGINACEAE		native	
Cryptantha nevadensis A. Nelson & P. B. Kenn. var. nevadensis	BORAGINACEAE	NEVADA CRYPTANTHA	native	
Cryptantha nevadensis A. Nelson & P. B. Kenn. var. rigida I. M. Johnst.	BORAGINACEAE	RIGID CRYPTANTHA	native	
Cryptantha nubigena (Greene) Payson	BORAGINACEAE	SIERRA CRYPTANTHA	native	
Cryptantha oxygona (A. Gray) Greene	BORAGINACEAE	SHARP-NUT CRYPTANTHA	native	
Cryptantha pterocarya (Torr.) Greene	BORAGINACEAE		native	
Cryptantha pterocarya (Torr.) Greene var. cycloptera (Greene) J. F. Macbr.	BORAGINACEAE	TUCSON CRYPTANTHA	native	
Cryptantha pterocarya (Torr.) Greene var. pterocarya	BORAGINACEAE	WINGED-NUT CRYPTANTHA	native	
Cryptantha pterocarya (Torr.) Greene var. purpusii Jeps.	BORAGINACEAE	PURPUS' CRYPTANTHA	native	
Cryptantha racemosa (S. Watson ex A. Gray) Greene	BORAGINACEAE	SHRUBBY CRYPTANTHA	native	
Cryptantha rattanii Greene	BORAGINACEAE	RATTAN'S CRYPTANTHA	native	
Cryptantha recurvata Coville	BORAGINACEAE	CURVED-NUT CRYPTANTHA	native	
Cryptantha roosiorum Munz	BORAGINACEAE	BRISTLECONE CRYPTANTHA	native	
Cryptantha rostellata (Greene) Greene	BORAGINACEAE	RED-STEMMED CRYPTANTHA	native	
Cryptantha schoolcraftii Tiehm	BORAGINACEAE	SCHOOLCRAFT'S CRYPTANTHA	native	
Cryptantha scoparia A. Nelson	BORAGINACEAE	GRAY CRYPTANTHA	native	
Cryptantha similis K. Mathew & P. H. Raven	BORAGINACEAE	DOME CRYPTANTHA	native	
Cryptantha simulans Greene	BORAGINACEAE	PINE CRYPTANTHA	native	
Cryptantha sparsiflora (Greene) Greene	BORAGINACEAE	FEW-FLOWERED CRYPTANTHA	native	
Cryptantha spithamaea I. M. Johnst.	BORAGINACEAE		native	
Cryptantha subretusa I. M. Johnst.	BORAGINACEAE	CRATER LAKE CRYPTANTHA	native	
Cryptantha torreyana (A. Gray) Greene	BORAGINACEAE		native	
Cryptantha torreyana (A. Gray) Greene var. pumila (A. Heller) I.M. Johnst.	BORAGINACEAE	DWARF CRYPTANTHA	native	
Cryptantha torreyana (A. Gray) Greene var. torreyana	BORAGINACEAE	TORREY'S CRYPTANTHA	native	
Cryptantha traskiae I. M. Johnst.	BORAGINACEAE	TRASK'S CRYPTANTHA	native	
Cryptantha tumulosa (Payson) Payson	BORAGINACEAE	NEW YORK MOUNTAINS CRYPTANTHA	native	
Cryptantha utahensis (A. Gray) Greene	BORAGINACEAE	SCENTED CRYPTANTHA	native	
Cryptantha virginensis (M. E. Jones) Payson	BORAGINACEAE	VIRGIN RIVER CRYPTANTHA	native	
Cryptantha watsonii (A. Gray) Greene	BORAGINACEAE	WATSON'S CRYPTANTHA	native	
Cryptantha wigginsii I. M. Johnston	BORAGINACEAE		native	acceptance uncertain
Cryptogramma acrostichoides R. Br.	PTERIDACEAE	AMERICAN PARSLEY FERN	native	
Cryptogramma cascadensis E. R. Alverson	PTERIDACEAE	CASCADE PARSLEY FERN	native	
Cucumis melo L.	CUCURBITACEAE		naturalized	
Cucumis melo L. var. dudaim (L.) Naudin	CUCURBITACEAE	DUDAIM MELON	naturalized	
Cucumis myriocarpus Naudin	CUCURBITACEAE	PADDY MELON	naturalized	
Cucurbita digitata A. Gray	CUCURBITACEAE	FINGER-LEAVED GOURD	native	
Cucurbita foetidissima Kunth	CUCURBITACEAE	CALABAZILLA	native	
Cucurbita palmata S. Watson	CUCURBITACEAE	COYOTE MELON	native	
Cucurbita pepo L.	CUCURBITACEAE		naturalized	acceptance uncertain
Cucurbita pepo L. var. pepo	CUCURBITACEAE	FIELD PUMPKIN	naturalized	acceptance uncertain
Cuniculotinus gramineus (H. M. Hall) Urbatsch, R. P. Roberts, & Neubig	ASTERACEAE		native	
Cupaniopsis anacardioides (A. Rich) Radlk.	SAPINDACEAE		naturalized	acceptance uncertain
Cuscuta approximata Bab.	CONVOLVULACEAE	ALFALFA DODDER	naturalized	
Cuscuta brachycalyx (Yunck.) Yunck.	CONVOLVULACEAE		native	
Cuscuta californica Hook. & Arn.	CONVOLVULACEAE	CHAPARRAL DODDER	native	
Cuscuta californica Hook. & Arn. var. apiculata Engelm.	CONVOLVULACEAE		native	
Cuscuta californica Hook. & Arn. var. californica	CONVOLVULACEAE		native	
Cuscuta californica Hook. & Arn. var. papillosa Yunck.	CONVOLVULACEAE		native	
Cuscuta campestris Yunck.	CONVOLVULACEAE	FIELD DODDER	native	
Cuscuta cephalanthi Engelm.	CONVOLVULACEAE	BUTTONBUSH DODDER	native	
Cuscuta denticulata Engelm.	CONVOLVULACEAE	SMALL-TOOTH DODDER	native	
Cuscuta howelliana P. Rubtzoff	CONVOLVULACEAE	BOGGS LAKE DODDER	native	
Cuscuta indecora Choisy	CONVOLVULACEAE		native	
Cuscuta indecora Choisy var. indecora	CONVOLVULACEAE	LARGE-SEEDED DODDER	native	
Cuscuta jepsonii Yunck.	CONVOLVULACEAE		native	
Cuscuta nevadensis I. M. Johnst.	CONVOLVULACEAE		native	
Cuscuta occidentalis Millsp.	CONVOLVULACEAE		native	
Cuscuta pacifica Costea & M. Wright	CONVOLVULACEAE	GOLDENTHREAD	native	
Cuscuta pacifica Costea & M. Wright var. pacifica	CONVOLVULACEAE		native	
Cuscuta pacifica Costea & M. Wright var. papillata (Yunck.) Costea & M. Wright	CONVOLVULACEAE		native	
Cuscuta salina Engelm.	CONVOLVULACEAE	SALT DODDER	native	
Cuscuta subinclusa Durand & Hilg.	CONVOLVULACEAE		native	
Cuscuta suksdorfii Yunck.	CONVOLVULACEAE	MOUNTAIN DODDER	native	
Cusickiella douglasii (A. Gray) Rollins	BRASSICACEAE		native	
Cusickiella quadricostata (Rollins) Rollins	BRASSICACEAE	BODIE HILLS CUSICKIELLA	native	
Cycladenia humilis Benth.	APOCYNACEAE		native	
Cycladenia humilis Benth. var. humilis	APOCYNACEAE		native	
Cycladenia humilis Benth. var. jonesii (Eastw.) S. L. Welsh & N. D. Atwood	APOCYNACEAE		native	
Cycladenia humilis Benth. var. venusta (Eastw.) Munz	APOCYNACEAE		native	
Cycloloma atriplicifolium (Spreng.) J. M. Coult.	CHENOPODIACEAE		naturalized	
Cyclospermum leptophyllum (Pers.) Sprague ex Britton & P. Wilson	APIACEAE		naturalized	
Cydonia oblonga Mill.	ROSACEAE		naturalized	acceptance uncertain
Cylindropuntia X fosbergii (C. B. Wolf) Rebman, M. A. Baker & Pinkava	CACTACEAE	PINK TEDDY-BEAR CHOLLA	native	
Cylindropuntia acanthocarpa (Engelm. & J. M. Bigelow) F. M. Knuth	CACTACEAE		native	
Cylindropuntia acanthocarpa (Engelm. & J. M. Bigelow) F. M. Knuth var. coloradensis (L. D. Benson) Pinkava	CACTACEAE	BUCKHORN CHOLLA	native	
Cylindropuntia bigelovii (Engelm.) F. M. Knuth	CACTACEAE	TEDDY-BEAR CHOLLA	native	
Cylindropuntia californica (Torr. & A. Gray) F. M. Knuth	CACTACEAE		native	
Cylindropuntia californica (Torr. & A. Gray) F. M. Knuth var. californica	CACTACEAE	SNAKE CHOLLA	native	
Cylindropuntia californica (Torr. & A. Gray) F. M. Knuth var. parkeri (J.M. Coult.) Pinkava	CACTACEAE	VALLEY CHOLLA	native	
Cylindropuntia echinocarpa (Engelm. & J. M. Bigelow) F. M. Knuth	CACTACEAE	GOLDEN CHOLLA	native	
Cylindropuntia ganderi (C. B. Wolf) Rebman & Pinkava	CACTACEAE	GANDER'S CHOLLA	native	
Cylindropuntia munzii (C. B. Wolf) Backeb.	CACTACEAE	MUNZ'S CHOLLA	native	
Cylindropuntia prolifera (Engelm.) F. M. Knuth	CACTACEAE	COAST CHOLLA	native	
Cylindropuntia ramosissima (Engelm.) F. M. Knuth	CACTACEAE	PENCIL CACTUS	native	
Cylindropuntia wolfii (L. D. Benson) M. A. Baker	CACTACEAE	WOLF'S CHOLLA	native	
Cymbalaria muralis P. Gaertn., B. Mey., & Scherb.	PLANTAGINACEAE	KENILWORTH IVY	naturalized	
Cymopterus aboriginum M. E. Jones	APIACEAE		native	
Cymopterus cinerarius A. Gray	APIACEAE		native	
Cymopterus deserticola Brandegee	APIACEAE	DESERT CYMOPTERUS	native	
Cymopterus gilmanii C. V. Morton	APIACEAE	GILMAN'S CYMOPTERUS	native	
Cymopterus globosus (S. Watson) S. Watson	APIACEAE	GLOBOSE CYMOPTERUS	native	
Cymopterus multinervatus (J. M. Coult. & Rose) Tidestr.	APIACEAE	PURPLE-NERVE CYMOPTERUS	native	
Cymopterus panamintensis J. M. Coult. & Rose	APIACEAE		native	
Cymopterus panamintensis J. M. Coult. & Rose var. acutifolius (J. M. Coult. & Rose) Munz	APIACEAE		native	
Cymopterus panamintensis J. M. Coult. & Rose var. panamintensis	APIACEAE		native	
Cymopterus purpurascens (A. Gray) M. E. Jones	APIACEAE		native	
Cymopterus ripleyi Barneby	APIACEAE	RIPLEY'S CYMOPTERUS	native	
Cymopterus terebinthinus (Hook.) Torr. & A. Gray	APIACEAE		native	
Cymopterus terebinthinus (Hook.) Torr. & A. Gray var. californicus (J. M. Coult. & Rose) Jeps.	APIACEAE		native	
Cymopterus terebinthinus (Hook.) Torr. & A. Gray var. petraeus (M. E. Jones) Goodrich	APIACEAE		native	
Cynara cardunculus L.	ASTERACEAE		naturalized	
Cynara cardunculus L. subsp. cardunculus	ASTERACEAE	ARTICHOKE	naturalized	
Cynara cardunculus L. subsp. flavescens Wiklund	ASTERACEAE		naturalized	
Cynodon dactylon (L.) Pers.	POACEAE	BERMUDA GRASS	naturalized	
Cynoglossum grande Lehm.	BORAGINACEAE	GRAND HOUND'S TONGUE	native	
Cynoglossum occidentale A. Gray	BORAGINACEAE	WESTERN HOUND'S TONGUE	native	
Cynoglossum officinale L.	BORAGINACEAE	COMMON HOUND'S TONGUE	naturalized	
Cynosurus cristatus L.	POACEAE	CRESTED DOGTAIL GRASS	naturalized	
Cynosurus echinatus L.	POACEAE	BRISTLY DOGTAIL GRASS	naturalized	
Cyperus acuminatus Torr. & Hook.	CYPERACEAE		native	
Cyperus bipartitus Torr.	CYPERACEAE		native	
Cyperus difformis L.	CYPERACEAE		naturalized	
Cyperus eragrostis Lam.	CYPERACEAE		native	
Cyperus erythrorhizos Muhl.	CYPERACEAE		native	
Cyperus esculentus L.	CYPERACEAE		native	
Cyperus esculentus L. var. leptostachyus Boeck.	CYPERACEAE		native	
Cyperus flavescens L.	CYPERACEAE		naturalized	
Cyperus flavicomus Michx.	CYPERACEAE		naturalized	
Cyperus fuscus L.	CYPERACEAE		naturalized	
Cyperus involucratus Rottb.	CYPERACEAE		naturalized	
Cyperus iria L.	CYPERACEAE		naturalized	
Cyperus laevigatus L.	CYPERACEAE		native	
Cyperus niger Ruiz & Pav.	CYPERACEAE		native	
Cyperus odoratus L.	CYPERACEAE		native	
Cyperus parishii Britton	CYPERACEAE		native	
Cyperus prolifer Lam.	CYPERACEAE		naturalized	acceptance uncertain
Cyperus rotundus L.	CYPERACEAE	PURPLE NUTSEDGE	naturalized	
Cyperus squarrosus L.	CYPERACEAE		native	
Cyperus strigosus L.	CYPERACEAE	FALSE NUTSEDGE	native	
Cypripedium californicum A. Gray	ORCHIDACEAE	CALIFORNIA LADY'S-SLIPPER	native	
Cypripedium fasciculatum Kellogg	ORCHIDACEAE	CLUSTERED LADY'S-SLIPPER	native	
Cypripedium montanum Douglas ex Lindl.	ORCHIDACEAE	MOUNTAIN LADY'S-SLIPPER	native	
Cypripedium parviflorum Salisb.	ORCHIDACEAE		native	
Cypripedium parviflorum Salisb. var. makasin (Farw.) Sheviak	ORCHIDACEAE	NORTHERN SMALL YELLOW LADY'S-SLIPPER	native	
Cypselea humifusa Turpin	AIZOACEAE		naturalized	
Cyrtomium falcatum (L. f.) C. Presl	DRYOPTERIDACEAE		naturalized	
Cystopteris fragilis (L.) Bernh.	WOODSIACEAE		native	
Cytisus multiflorus (L'Hér.) Sweet	FABACEAE	PORTUGUESE BROOM	naturalized	
Cytisus proliferus L. f.	FABACEAE	TREE LUCERNE	naturalized	
Cytisus scoparius (L.) Link	FABACEAE	SCOTCH BROOM	naturalized	
Cytisus striatus (Hill) Rothm.	FABACEAE		naturalized	
Dactylis glomerata L.	POACEAE		naturalized	
Dactyloctenium aegyptium (L.) Willd.	POACEAE	DURBAN CROWFOOT	naturalized	
Dalea mollis Benth.	FABACEAE		native	
Dalea mollissima (Rydb.) Munz	FABACEAE		native	
Dalea ornata (Hook.) Eaton & J. Wright	FABACEAE	ORNATE DALEA	native	
Dalea searlsiae (A. Gray) Barneby	FABACEAE		native	
Damasonium californicum Torr. ex Benth.	ALISMATACEAE		native	
Danthonia californica Bol.	POACEAE	CALIFORNIA OAT GRASS	native	
Danthonia intermedia Vasey	POACEAE		native	
Danthonia intermedia Vasey subsp. intermedia	POACEAE	INTERMEDIATE OAT GRASS	native	
Danthonia unispicata (Thurb.) Munro ex Vasey	POACEAE	ONE-SPIKE OAT GRASS	native	
Darlingtonia californica Torr.	SARRACENIACEAE		native	
Darmera peltata (Torr. ex Benth.) Voss	SAXIFRAGACEAE		native	
Dasiphora fruticosa (L.) Rydb.	ROSACEAE	SHRUBBY CINQUEFOIL	native	
Dasyochloa pulchella (Kunth) Willd. ex Rydb.	POACEAE		native	
Datisca glomerata (C. Presl) Baill.	DATISCACEAE	DURANGO ROOT	native	
Datura discolor Bernh.	SOLANACEAE		native	
Datura ferox L.	SOLANACEAE		naturalized	
Datura stramonium L.	SOLANACEAE		naturalized	
Datura wrightii Regel	SOLANACEAE		native	
Daucus carota L.	APIACEAE	QUEEN ANNE'S LACE	naturalized	
Daucus pusillus Michx.	APIACEAE		native	
Dedeckera eurekensis Reveal & J. T. Howell	POLYGONACEAE	JULY GOLD	native	
Deinandra arida (D. D. Keck) B. G. Baldwin	ASTERACEAE	RED ROCK TARPLANT	native	
Deinandra bacigalupii B. G. Baldwin	ASTERACEAE	LIVERMORE TARPLANT	native	
Deinandra clementina (Brandegee) B. G. Baldwin	ASTERACEAE	ISLAND TARPLANT	native	
Deinandra conjugens (D. D. Keck) B. G. Baldwin	ASTERACEAE	OTAY TARPLANT	native	
Deinandra corymbosa (DC.) B. G. Baldwin	ASTERACEAE		native	
Deinandra corymbosa (DC.) B. G. Baldwin subsp. corymbosa	ASTERACEAE		native	
Deinandra corymbosa (DC.) B. G. Baldwin subsp. macrocephala (Nutt.) B. G. Baldwin	ASTERACEAE		native	
Deinandra fasciculata (DC.) Greene	ASTERACEAE		native	
Deinandra floribunda (A. Gray) Davidson & Moxley	ASTERACEAE	TECATE TARPLANT	native	
Deinandra halliana (D. D. Keck) B. G. Baldwin	ASTERACEAE	HALL'S TARPLANT	native	
Deinandra increscens (H. M. Hall ex D. D. Keck) B. G. Baldwin	ASTERACEAE		native	
Deinandra increscens (H. M. Hall ex D. D. Keck) B. G. Baldwin subsp. increscens	ASTERACEAE		native	
Deinandra increscens (H. M. Hall ex D. D. Keck) B. G. Baldwin subsp. villosa (Tanowitz) B. G. Baldwin	ASTERACEAE	GAVIOTA TARPLANT	native	
Deinandra kelloggii (Greene) Greene	ASTERACEAE		native	
Deinandra lobbii (Greene) Greene	ASTERACEAE		native	
Deinandra minthornii (Jeps.) B. G. Baldwin	ASTERACEAE	SANTA SUSANA TARPLANT	native	
Deinandra mohavensis (D. D. Keck) B. G. Baldwin	ASTERACEAE	MOJAVE TARPLANT	native	
Deinandra pallida (D. D. Keck) B. G. Baldwin	ASTERACEAE		native	
Deinandra paniculata (A. Gray) Davidson & Moxley	ASTERACEAE	PANICULATE TARPLANT	native	
Deinandra pentactis (D. D. Keck) B. G. Baldwin	ASTERACEAE		native	
Delairea odorata Lem.	ASTERACEAE		naturalized	
Delosperma litorale (Kensit) L. Bolus	AIZOACEAE		naturalized	
Delphinium andersonii A. Gray	RANUNCULACEAE	ANDERSON'S LARKSPUR	native	
Delphinium antoninum Eastw.	RANUNCULACEAE	ANTHONY PEAK LARKSPUR	native	
Delphinium bakeri Ewan	RANUNCULACEAE	BAKER'S LARKSPUR	native	
Delphinium californicum Torr. & A. Gray	RANUNCULACEAE		native	
Delphinium californicum Torr. & A. Gray subsp. californicum	RANUNCULACEAE	CALIFORNIA LARKSPUR	native	
Delphinium californicum Torr. & A. Gray subsp. interius (Eastw.) Ewan	RANUNCULACEAE	HOSPITAL CANYON LARKSPUR	native	
Delphinium cardinale Hook.	RANUNCULACEAE	SCARLET LARKSPUR	native	
Delphinium decorum Fisch. & C. A. Mey.	RANUNCULACEAE		native	
Delphinium decorum Fisch. & C. A. Mey. subsp. decorum	RANUNCULACEAE	COAST LARKSPUR	native	
Delphinium decorum Fisch. & C. A. Mey. subsp. tracyi Ewan	RANUNCULACEAE	TRACY'S LARKSPUR	native	
Delphinium depauperatum Nutt.	RANUNCULACEAE	MOUNTAIN LARKSPUR	native	
Delphinium glaucum S. Watson	RANUNCULACEAE	TALL LARKSPUR	native	
Delphinium gracilentum Greene	RANUNCULACEAE	GREENE'S LARKSPUR	native	
Delphinium gypsophilum Ewan	RANUNCULACEAE	GYPSUM-LOVING LARKSPUR	native	
Delphinium hansenii (Greene) Greene	RANUNCULACEAE		native	
Delphinium hansenii (Greene) Greene subsp. ewanianum M. J. Warnock	RANUNCULACEAE	EWAN'S LARKSPUR	native	
Delphinium hansenii (Greene) Greene subsp. hansenii	RANUNCULACEAE	HANSEN'S LARKSPUR	native	
Delphinium hansenii (Greene) Greene subsp. kernense (Davidson) Ewan	RANUNCULACEAE	KERN COUNTY LARKSPUR	native	
Delphinium hesperium A. Gray	RANUNCULACEAE		native	
Delphinium hesperium A. Gray subsp. cuyamacae (Abrams) H. Lewis & Epling	RANUNCULACEAE	CUYAMACA LARKSPUR	native	
Delphinium hesperium A. Gray subsp. hesperium	RANUNCULACEAE	WESTERN LARKSPUR	native	
Delphinium hesperium A. Gray subsp. pallescens (Ewan) H. Lewis & Epling	RANUNCULACEAE	PALE-FLOWERED WESTERN LARKSPUR	native	
Delphinium hutchinsoniae Ewan	RANUNCULACEAE	HUTCHINSON'S LARKSPUR	native	
Delphinium inopinum (Jeps.) H. Lewis & Epling	RANUNCULACEAE	UNEXPECTED LARKSPUR	native	
Delphinium luteum A. Heller	RANUNCULACEAE	GOLDEN LARKSPUR	native	
Delphinium nudicaule Torr. & A. Gray	RANUNCULACEAE	ORANGE LARKSPUR	native	
Delphinium nuttallianum Pritz.	RANUNCULACEAE	SONNE'S LARKSPUR	native	
Delphinium parishii A. Gray	RANUNCULACEAE		native	
Delphinium parishii A. Gray subsp. pallidum (Munz) M. J. Warnock	RANUNCULACEAE	PALE-FLOWERED PARISH'S LARKSPUR	native	
Delphinium parishii A. Gray subsp. parishii	RANUNCULACEAE	MOJAVE LARKSPUR	native	
Delphinium parishii A. Gray subsp. subglobosum (Wiggins) H. Lewis & Epling	RANUNCULACEAE	COLORADO DESERT LARKSPUR	native	
Delphinium parryi A. Gray	RANUNCULACEAE		native	
Delphinium parryi A. Gray subsp. blochmaniae (Greene) H. Lewis & Epling	RANUNCULACEAE	DUNE LARKSPUR	native	
Delphinium parryi A. Gray subsp. eastwoodiae Ewan	RANUNCULACEAE	EASTWOOD'S LARKSPUR	native	
Delphinium parryi A. Gray subsp. maritimum (Davidson) M. J. Warnock	RANUNCULACEAE	MARITIME LARKSPUR	native	
Delphinium parryi A. Gray subsp. parryi	RANUNCULACEAE	PARRY'S LARKSPUR	native	
Delphinium parryi A. Gray subsp. purpureum (H. Lewis & Epling) M. J. Warnock	RANUNCULACEAE	MOUNT PINOS LARKSPUR	native	
Delphinium patens Benth.	RANUNCULACEAE	ZIGZAG LARKSPUR	native	
Delphinium patens Benth. subsp. hepaticoideum Ewan	RANUNCULACEAE		native	
Delphinium patens Benth. subsp. montanum (Munz) Ewan	RANUNCULACEAE		native	
Delphinium patens Benth. subsp. patens	RANUNCULACEAE		native	
Delphinium polycladon Eastw.	RANUNCULACEAE	HIGH MOUNTAIN LARKSPUR	native	
Delphinium purpusii Brandegee	RANUNCULACEAE	ROSE-FLOWERED LARKSPUR	native	
Delphinium recurvatum Greene	RANUNCULACEAE	RECURVED LARKSPUR	native	
Delphinium scaposum Greene	RANUNCULACEAE	BARE-STEM LARKSPUR	native	
Delphinium stachydeum (A. Gray) Tidestr.	RANUNCULACEAE	SPIKED LARKSPUR	native	
Delphinium trolliifolium A. Gray	RANUNCULACEAE	POISON LARKSPUR	native	
Delphinium uliginosum Curran	RANUNCULACEAE	SWAMP LARKSPUR	native	
Delphinium umbraculorum H. Lewis & Epling	RANUNCULACEAE	UMBRELLA LARKSPUR	native	
Delphinium variegatum Torr. & A. Gray	RANUNCULACEAE	ROYAL LARKSPUR	native	
Delphinium variegatum Torr. & A. Gray subsp. kinkiense (Munz) M. J. Warnock	RANUNCULACEAE	SAN CLEMENTE ISLAND LARKSPUR	native	
Delphinium variegatum Torr. & A. Gray subsp. thornei Munz	RANUNCULACEAE	THORNE'S ROYAL LARKSPUR	native	
Delphinium variegatum Torr. & A. Gray subsp. variegatum	RANUNCULACEAE		native	
Dendromecon harfordii Kellogg	PAPAVERACEAE	CHANNEL ISLAND TREE POPPY	native	
Dendromecon rigida Benth.	PAPAVERACEAE	BUSH POPPY	native	
Deschampsia cespitosa (L.) P. Beauv.	POACEAE	TUFTED HAIR GRASS	native	
Deschampsia cespitosa (L.) P. Beauv. subsp. beringensis (Hultén) W. E. Lawr.	POACEAE		native	
Deschampsia cespitosa (L.) P. Beauv. subsp. cespitosa	POACEAE		native	
Deschampsia cespitosa (L.) P. Beauv. subsp. holciformis (J. Presl) W. E. Lawr.	POACEAE		native	
Deschampsia danthonioides (Trin.) Munro	POACEAE	ANNUAL HAIR GRASS	native	
Deschampsia elongata (Hook.) Munro	POACEAE	SLENDER HAIR GRASS	native	
Descurainia adenophora (Wooton & Standl.) O.E. Schulz	BRASSICACEAE		native	
Descurainia californica (A. Gray) O. E. Schulz	BRASSICACEAE		native	
Descurainia incana (Fisch. & C. A. Mey.) Dorn	BRASSICACEAE		native	
Descurainia incisa (Engelm.) Britton	BRASSICACEAE		native	
Descurainia incisa (Engelm.) Britton subsp. incisa	BRASSICACEAE		native	
Descurainia longipedicellata (E. Fourn.) O.E. Schulz	BRASSICACEAE		native	
Descurainia nelsonii (Rydb.) Al-Shehbaz & Goodson	BRASSICACEAE		native	
Descurainia paradisa (A. Nelson & P. B. Kenn.) O. E. Schulz	BRASSICACEAE		native	
Descurainia pinnata (Walter) Britton	BRASSICACEAE		native	
Descurainia pinnata (Walter) Britton subsp. brachycarpa (Richardson) Detling	BRASSICACEAE		native	
Descurainia pinnata (Walter) Britton subsp. glabra (Wooton & Standl.) Detling	BRASSICACEAE		native	
Descurainia pinnata (Walter) Britton subsp. ochroleuca (Wooten) Detling	BRASSICACEAE		native	
Descurainia sophia (L.) Webb ex Prantl	BRASSICACEAE		naturalized	
Desmazeria rigida (L.) Tutin	POACEAE		naturalized	
Dianthus armeria L.	CARYOPHYLLACEAE		naturalized	
Dianthus armeria L. subsp. armeria	CARYOPHYLLACEAE	DEPTFORD PINK	naturalized	
Dianthus barbatus L.	CARYOPHYLLACEAE		naturalized	
Dianthus barbatus L. subsp. barbatus	CARYOPHYLLACEAE	SWEET-WILLIAM	naturalized	
Dianthus deltoides L.	CARYOPHYLLACEAE		naturalized	
Dianthus deltoides L. subsp. deltoides	CARYOPHYLLACEAE	MEADOW PINK	naturalized	
Dicentra formosa (Haw.) Walp.	PAPAVERACEAE	PACIFIC BLEEDING HEART	native	
Dicentra nevadensis Eastw.	PAPAVERACEAE	TULARE COUNTY BLEEDING HEART	native	
Dicentra pauciflora S. Watson	PAPAVERACEAE		native	
Dicentra uniflora Kellogg	PAPAVERACEAE	STEER'S HEAD	native	
Dichelostemma capitatum (Benth.) Alph. Wood	THEMIDACEAE	BLUE DICKS	native	
Dichelostemma capitatum (Benth.) Alph. Wood subsp. capitatum	THEMIDACEAE		native	
Dichelostemma capitatum (Benth.) Alph. Wood subsp. pauciflorum (Torr.) Keator	THEMIDACEAE		native	
Dichelostemma congestum (Sm.) Kunth	THEMIDACEAE	FORK-TOOTHED OOKOW	native	
Dichelostemma ida-maia (Alph. Wood) Greene	THEMIDACEAE	FIRECRACKER FLOWER	native	
Dichelostemma multiflorum (Benth.) A. Heller	THEMIDACEAE	WILD HYACINTH	native	
Dichelostemma volubile (Kellogg) A. Heller	THEMIDACEAE	SNAKE LILY	native	
Dichondra donelliana Tharp & M. C. Johnst.	CONVOLVULACEAE		native	
Dichondra micrantha Urb.	CONVOLVULACEAE		naturalized	
Dichondra occidentalis House	CONVOLVULACEAE	WESTERN DICHONDRA	native	
Dicoria canescens A. Gray	ASTERACEAE		native	
Dicranostegia orcuttiana (A. Gray) Pennell	OROBANCHACEAE	BAJA BIRD'S-BEAK	native	
Dieteria asteroides Torr.	ASTERACEAE		native	
Dieteria asteroides Torr. var. asteroides	ASTERACEAE		native	
Dieteria asteroides Torr. var. lagunensis (D. D. Keck) D. R. Morgan & R. L. Hartm.	ASTERACEAE	MOUNT LAGUNA ASTER	native	
Dieteria canescens (Pursh) Nutt.	ASTERACEAE	HOARY-ASTER	native	
Dieteria canescens (Pursh) Nutt. var. canescens	ASTERACEAE		native	
Dieteria canescens (Pursh) Nutt. var. incana (Lindl.) D. R. Morgan & R. L. Hartm.	ASTERACEAE		native	
Dieteria canescens (Pursh) Nutt. var. leucanthemifolia (Greene) D. R. Morgan & R. L. Hartm.	ASTERACEAE		native	
Dieteria canescens (Pursh) Nutt. var. shastensis (A. Gray) D. R. Morgan & R. L. Hartm.	ASTERACEAE		native	
Dieteria canescens (Pursh) Nutt. var. ziegleri (Munz) D. R. Morgan & R. L. Hartm.	ASTERACEAE	ZIEGLER'S ASTER	native	
Digitalis purpurea L.	PLANTAGINACEAE		naturalized	
Digitaria californica (Benth.) Henrard	POACEAE		native	
Digitaria californica (Benth.) Henrard var. californica	POACEAE	ARIZONA COTTONTOP	native	
Digitaria ciliaris (Retz.) Koel.	POACEAE		naturalized	
Digitaria ciliaris (Retz.) Koel. var. ciliaris	POACEAE	SOUTHERN CRAB GRASS	naturalized	
Digitaria ischaemum (Schreb.) Muhl.	POACEAE	SMOOTH CRAB GRASS	naturalized	
Digitaria sanguinalis (L.) Scop.	POACEAE	HAIRY CRAB GRASS	naturalized	
Dimeresia howellii A. Gray	ASTERACEAE	DOUBLET	native	
Dimorphotheca ecklonis DC.	ASTERACEAE	BLUE & WHITE DAISYBUSH	naturalized	
Dimorphotheca fruticosa (L.) DC.	ASTERACEAE	TRAILING AFRICAN DAISY	naturalized	
Dimorphotheca sinuata DC.	ASTERACEAE	NAMAQUALAND DAISY	naturalized	
Diospyros virginiana L.	EBENACEAE		naturalized	
Diospyros virginiana L. var. virginiana	EBENACEAE		naturalized	
Diplotaxis muralis (L.) DC.	BRASSICACEAE		naturalized	
Diplotaxis tenuifolia (L.) DC.	BRASSICACEAE		naturalized	
Dipsacus fullonum L.	DIPSACACEAE	WILD TEASEL	naturalized	
Dipsacus sativus (L.) Honck.	DIPSACACEAE	FULLER'S TEASEL	naturalized	
Dirca occidentalis A. Gray	THYMELAEACEAE	WESTERN LEATHERWOOD	native	
Dissanthelium californicum (Nutt.) Benth.	POACEAE	CALIFORNIA DISSANTHELIUM	native	
Distichlis littoralis (Engelm.) H.L. Bell & Columbus	POACEAE	SHORE GRASS	native	
Distichlis spicata (L.) Greene	POACEAE	SALT GRASS	native	
Ditaxis claryana (Jeps.) Webster	EUPHORBIACEAE	GLANDULAR DITAXIS	native	
Ditaxis lanceolata (Benth.) Pax & K. Hoffm.	EUPHORBIACEAE		native	
Ditaxis neomexicana (Müll. Arg.) A. Heller	EUPHORBIACEAE		native	
Ditaxis serrata (Torr.) A. Heller	EUPHORBIACEAE		native	
Ditaxis serrata (Torr.) A. Heller var. californica (Brandegee) V. W. Steinm. & Felger	EUPHORBIACEAE	CALIFORNIA DITAXIS	native	
Ditaxis serrata (Torr.) A. Heller var. serrata	EUPHORBIACEAE		native	
Dithyrea californica Harv.	BRASSICACEAE		native	
Dithyrea maritima (Davidson) Davidson	BRASSICACEAE	BEACH SPECTACLEPOD	native	
Dittrichia graveolens (L.) Greuter	ASTERACEAE	STINKWORT	naturalized	
Dodecahema leptoceras (A. Gray) Reveal & Hardham	POLYGONACEAE	SLENDER-HORNED SPINEFLOWER	native	
Dodecatheon alpinum (A. Gray) Greene	PRIMULACEAE	ALPINE SHOOTING STAR	native	
Dodecatheon clevelandii Greene	PRIMULACEAE		native	
Dodecatheon clevelandii Greene subsp. clevelandii	PRIMULACEAE		native	
Dodecatheon clevelandii Greene subsp. insulare H. J. Thomps.	PRIMULACEAE		native	
Dodecatheon clevelandii Greene subsp. patulum (Kuntze) H. J. Thomps.	PRIMULACEAE		native	
Dodecatheon clevelandii Greene subsp. sanctarum (Greene) Abrams	PRIMULACEAE		native	
Dodecatheon conjugens Greene	PRIMULACEAE		native	
Dodecatheon hendersonii A. Gray	PRIMULACEAE	SAILOR CAPS	native	
Dodecatheon jeffreyi Van Houtte	PRIMULACEAE	SIERRA SHOOTING STAR	native	
Dodecatheon pulchellum (Raf.) Merr.	PRIMULACEAE	BEAUTIFUL SHOOTING STAR	native	
Dodecatheon redolens (H. M. Hall) H. J. Thomps.	PRIMULACEAE		native	
Dodecatheon subalpinum Eastw.	PRIMULACEAE		native	
Dopatrium junceum (Roxb.) Buch.-Ham. ex Benth.	PLANTAGINACEAE		naturalized	
Downingia bacigalupii Weiler	CAMPANULACEAE		native	
Downingia bella Hoover	CAMPANULACEAE		native	
Downingia bicornuta A. Gray	CAMPANULACEAE		native	
Downingia bicornuta A. Gray var. bicornuta	CAMPANULACEAE		native	
Downingia bicornuta A. Gray var. picta Hoover	CAMPANULACEAE		native	
Downingia concolor Greene	CAMPANULACEAE		native	
Downingia concolor Greene var. brevior McVaugh	CAMPANULACEAE	CUYAMACA LAKE DOWNINGIA	native	
Downingia concolor Greene var. concolor	CAMPANULACEAE		native	
Downingia cuspidata (Greene) Rattan	CAMPANULACEAE		native	
Downingia elegans (Douglas ex Lindl.) Torr.	CAMPANULACEAE		native	
Downingia insignis Greene	CAMPANULACEAE		native	
Downingia laeta (Greene) Greene	CAMPANULACEAE	GREAT BASIN DOWNINGIA	native	
Downingia montana Greene	CAMPANULACEAE		native	
Downingia ornatissima Greene	CAMPANULACEAE		native	
Downingia ornatissima Greene var. eximia (Hoover) McVaugh	CAMPANULACEAE		native	
Downingia ornatissima Greene var. ornatissima	CAMPANULACEAE		native	
Downingia pulchella (Lindl.) Torr.	CAMPANULACEAE		native	
Downingia pulcherrima M. Peck	CAMPANULACEAE		native	
Downingia pusilla (G. Don ex A. DC.) Torr.	CAMPANULACEAE	DWARF DOWNINGIA	native	
Downingia willamettensis M. Peck	CAMPANULACEAE		native	
Draba albertina Greene	BRASSICACEAE		native	
Draba asterophora Payson	BRASSICACEAE		native	
Draba aureola S. Watson	BRASSICACEAE	GOLDEN ALPINE DRABA	native	
Draba breweri S. Watson	BRASSICACEAE		native	
Draba californica (Jeps.) Rollins & R. A. Price	BRASSICACEAE	CALIFORNIA DRABA	native	
Draba cana Rydb.	BRASSICACEAE	CANESCENT DRABA	native	
Draba carnosula O. E. Schulz	BRASSICACEAE	MOUNT EDDY DRABA	native	
Draba corrugata S. Watson	BRASSICACEAE		native	
Draba cruciata Payson	BRASSICACEAE	MINERAL KING DRABA	native	
Draba cuneifolia Torr. & A. Gray	BRASSICACEAE		native	
Draba densifolia Nutt.	BRASSICACEAE		native	
Draba howellii S. Watson	BRASSICACEAE	HOWELL'S DRABA	native	
Draba incrassata (Rollins) Rollins & R. A. Price	BRASSICACEAE	SWEETWATER MOUNTAINS DRABA	native	
Draba lemmonii S. Watson	BRASSICACEAE		native	
Draba lonchocarpa Rydb.	BRASSICACEAE	SPEAR-FRUITED DRABA	native	
Draba longisquamosa O. E. Schulz	BRASSICACEAE		native	
Draba monoensis Rollins & R. A. Price	BRASSICACEAE	WHITE MOUNTAINS DRABA	native	
Draba novolympica Payson & H. St. John	BRASSICACEAE		native	
Draba oligosperma Hook.	BRASSICACEAE		native	
Draba praealta Greene	BRASSICACEAE	TALL DRABA	native	
Draba pterosperma Payson	BRASSICACEAE	WINGED-SEED DRABA	native	
Draba saxosa Davidson	BRASSICACEAE	SOUTHERN CALIFORNIA ROCK DRABA	native	
Draba sharsmithii Rollins & R. A. Price	BRASSICACEAE	MOUNT WHITNEY DRABA	native	
Draba sierrae Sharsm.	BRASSICACEAE	SIERRA DRABA	native	
Draba subumbellata Rollins & R. A. Price	BRASSICACEAE	MOUND DRABA	native	
Draba verna L.	BRASSICACEAE		native	
Draperia systyla (A. Gray) Torr. ex A. Gray	BORAGINACEAE		native	
Drosanthemum floribundum (Haw.) Schwantes	AIZOACEAE		naturalized	
Drosera anglica Huds.	DROSERACEAE	ENGLISH SUNDEW	native	
Drosera rotundifolia L.	DROSERACEAE	ROUND-LEAVED SUNDEW	native	
Drymocallis cuneifolia Rydb.	ROSACEAE		native	
Drymocallis cuneifolia Rydb. var. cuneifolia	ROSACEAE	WEDGELEAF WOODBEAUTY	native	
Drymocallis cuneifolia Rydb. var. ewanii (D.D. Keck) Ertter	ROSACEAE	EWAN'S WOODBEAUTY	native	
Drymocallis glandulosa (Lindl.) Rydb.	ROSACEAE		native	
Drymocallis glandulosa (Lindl.) Rydb. var. glandulosa	ROSACEAE		native	
Drymocallis glandulosa (Lindl.) Rydb. var. reflexa (Greene) Ertter	ROSACEAE		native	
Drymocallis glandulosa (Lindl.) Rydb. var. viscida (Parish) Ertter	ROSACEAE		native	
Drymocallis glandulosa (Lindl.) Rydb. var. wrangelliana (Fisch. & Avé-Lall.) Ertter	ROSACEAE		native	
Drymocallis hansenii (Greene) Rydb.	ROSACEAE	YOSEMITE WOODBEAUTY	native	
Drymocallis lactea (Greene) Rydb.	ROSACEAE		native	
Drymocallis lactea (Greene) Rydb. var. austiniae (Jeps.) Ertter	ROSACEAE	AUSTIN'S WOODBEAUTY	native	
Drymocallis lactea (Greene) Rydb. var. lactea	ROSACEAE	SIERRAN WOODBEAUTY	native	
Drymocallis pseudorupestris (Rydb.) Rydb.	ROSACEAE		native	
Drymocallis pseudorupestris (Rydb.) Rydb. var. crumiana D.D. Keck ex Ertter	ROSACEAE	CRUM'S WOODBEAUTY	native	
Drymocallis pseudorupestris (Rydb.) Rydb. var. saxicola Ertter	ROSACEAE	CLIFF WOODBEAUTY	native	
Drymocallis rhomboidea (Rydb.) Rydb.	ROSACEAE		native	
Dryopteris arguta (Kaulf.) Maxon	DRYOPTERIDACEAE		native	
Dryopteris expansa (C. Presl) Fraser-Jenk. & Jermy	DRYOPTERIDACEAE		native	
Dryopteris filix-mas (L.) Schott	DRYOPTERIDACEAE	MALE FERN	native	
Duchesnea indica (Andrews) Focke	ROSACEAE		naturalized	
Duchesnea indica (Andrews) Focke var. indica	ROSACEAE	MOCK-STRAWBERRY	naturalized	
Dudleya abramsii Rose	CRASSULACEAE		native	
Dudleya abramsii Rose subsp. abramsii	CRASSULACEAE		native	
Dudleya abramsii Rose subsp. affinis K. M. Nakai	CRASSULACEAE	SAN BERNARDINO MOUNTAINS DUDLEYA	native	
Dudleya abramsii Rose subsp. bettinae (Hoover) Bartel	CRASSULACEAE	BETTY'S DUDLEYA	native	
Dudleya abramsii Rose subsp. calcicola (Bartel & Shevock) K. M. Nakai	CRASSULACEAE	LIMESTONE DUDLEYA	native	
Dudleya abramsii Rose subsp. murina (Eastw.) Moran	CRASSULACEAE	MOUSE-GRAY DUDLEYA	native	
Dudleya abramsii Rose subsp. setchellii (Jeps.) Morin	CRASSULACEAE	SANTA CLARA VALLEY DUDLEYA	native	
Dudleya arizonica Rose	CRASSULACEAE		native	
Dudleya attenuata (S. Watson) Moran	CRASSULACEAE		native	
Dudleya attenuata (S. Watson) Moran subsp. attenuata	CRASSULACEAE		native	
Dudleya blochmaniae (Eastw.) Moran	CRASSULACEAE		native	
Dudleya blochmaniae (Eastw.) Moran subsp. blochmaniae	CRASSULACEAE	BLOCHMAN'S DUDLEYA	native	
Dudleya blochmaniae (Eastw.) Moran subsp. insularis (Moran) Moran	CRASSULACEAE	SANTA ROSA ISLAND DUDLEYA	native	
Dudleya brevifolia (Moran) Moran	CRASSULACEAE	SHORTLEAVED DUDLEYA	native	
Dudleya caespitosa (Haw.) Britton & Rose	CRASSULACEAE		native	
Dudleya candelabrum Rose	CRASSULACEAE	CANDLEHOLDER DUDLEYA	native	
Dudleya cymosa (Lem.) Britton & Rose	CRASSULACEAE		native	
Dudleya cymosa (Lem.) Britton & Rose subsp. agourensis K. M. Nakai	CRASSULACEAE	AGOURA HILLS DUDLEYA	native	
Dudleya cymosa (Lem.) Britton & Rose subsp. costatifolia Bartel & Shevock	CRASSULACEAE	PIERPOINT SPRINGS DUDLEYA	native	
Dudleya cymosa (Lem.) Britton & Rose subsp. crebrifolia K. M. Nakai & Verity	CRASSULACEAE	SAN GABRIEL RIVER DUDLEYA	native	
Dudleya cymosa (Lem.) Britton & Rose subsp. cymosa	CRASSULACEAE		native	
Dudleya cymosa (Lem.) Britton & Rose subsp. marcescens Moran	CRASSULACEAE	MARCESCENT DUDLEYA	native	
Dudleya cymosa (Lem.) Britton & Rose subsp. ovatifolia (Britton) Moran	CRASSULACEAE	SANTA MONICA DUDLEYA	native	
Dudleya cymosa (Lem.) Britton & Rose subsp. paniculata (Jeps.) K. M. Nakai	CRASSULACEAE		native	
Dudleya cymosa (Lem.) Britton & Rose subsp. pumila (Rose) K. M. Nakai	CRASSULACEAE		native	
Dudleya densiflora (Rose) Moran	CRASSULACEAE	SAN GABRIEL MOUNTAINS DUDLEYA	native	
Dudleya edulis (Nutt.) Moran	CRASSULACEAE		native	
Dudleya farinosa (Lindl.) Britton & Rose	CRASSULACEAE	BLUFF LETTUCE	native	
Dudleya gnoma S. W. McCabe	CRASSULACEAE	MUNCHKIN DUDLEYA	native	
Dudleya greenei Rose	CRASSULACEAE	GREENE'S DUDLEYA	native	
Dudleya lanceolata (Nutt.) Britton & Rose	CRASSULACEAE	LANCE-LEAVED DUDLEYA	native	
Dudleya multicaulis (Rose) Moran	CRASSULACEAE	MANY-STEMMED DUDLEYA	native	
Dudleya nesiotica (Moran) Moran	CRASSULACEAE	SANTA CRUZ ISLAND DUDLEYA	native	
Dudleya palmeri (S. Watson) Britton & Rose	CRASSULACEAE	PALMER'S DUDLEYA	native	
Dudleya parva Rose & Davidson	CRASSULACEAE	CONEJO DUDLEYA	native	
Dudleya pulverulenta (Nutt.) Britton & Rose	CRASSULACEAE	CHALK DUDLEYA	native	
Dudleya saxosa (M. E. Jones) Britton & Rose	CRASSULACEAE		native	
Dudleya saxosa (M. E. Jones) Britton & Rose subsp. aloides (Rose) Moran	CRASSULACEAE		native	
Dudleya saxosa (M. E. Jones) Britton & Rose subsp. saxosa	CRASSULACEAE	PANAMINT DUDLEYA	native	
Dudleya stolonifera Moran	CRASSULACEAE	LAGUNA BEACH DUDLEYA	native	
Dudleya traskiae (Rose) Moran	CRASSULACEAE	SANTA BARBARA ISLAND DUDLEYA	native	
Dudleya variegata (S. Watson) Moran	CRASSULACEAE	VARIEGATED DUDLEYA	native	
Dudleya verityi K. M. Nakai	CRASSULACEAE	VERITY'S DUDLEYA	native	
Dudleya virens (Rose) Moran	CRASSULACEAE		native	
Dudleya virens (Rose) Moran subsp. hassei (Rose) Moran	CRASSULACEAE		native	
Dudleya virens (Rose) Moran subsp. insularis (Rose) Moran	CRASSULACEAE	ISLAND GREEN DUDLEYA	native	
Dudleya virens (Rose) Moran subsp. virens	CRASSULACEAE	BRIGHT GREEN DUDLEYA	native	
Dudleya viscida (S. Watson) Moran	CRASSULACEAE	STICKY DUDLEYA	native	
Dulichium arundinaceum (L.) Britton	CYPERACEAE		native	
Dulichium arundinaceum (L.) Britton var. arundinaceum	CYPERACEAE	THREE-WAY SEDGE	native	
Dysphania ambrosioides (L.) Mosyakin & Clemants	CHENOPODIACEAE	MEXICAN TEA	naturalized	
Dysphania anthelmintica (L.) Mosyakin & Clemants	CHENOPODIACEAE	WORMSEED	naturalized	
Dysphania botrys (L.) Mosyakin & Clemants	CHENOPODIACEAE	JERUSALEM OAK	naturalized	
Dysphania chilensis (Schrad.) Mosyakin & Clemants	CHENOPODIACEAE		naturalized	
Dysphania multifida (L.) Mosyakin & Clemants	CHENOPODIACEAE		naturalized	
Dysphania pumilio (R. Br.) Mosyakin & Clemants	CHENOPODIACEAE		naturalized	
Dyssodia tenuiloba (DC.) B. L. Rob. var. tenuiloba	ASTERACEAE		naturalized	acceptance uncertain
Eastwoodia elegans Brandegee	ASTERACEAE		native	
Eatonella nivea (D.C. Eaton) A. Gray	ASTERACEAE		native	
Echinocactus polycephalus Engelm. & J. M. Bigelow	CACTACEAE		native	
Echinocactus polycephalus Engelm. & J. M. Bigelow var. polycephalus	CACTACEAE		native	
Echinocereus engelmannii (Parry ex Engelm.) Lem.	CACTACEAE		native	
Echinocereus mojavensis Engelm. & J. M. Bigelow	CACTACEAE		native	
Echinochloa colona (L.) Link	POACEAE		naturalized	
Echinochloa crus-galli (L.) P. Beauv.	POACEAE		naturalized	
Echinochloa crus-pavonis (Kunth) Schult.	POACEAE		naturalized	
Echinochloa crus-pavonis (Kunth) Schult. var. crus-pavonis	POACEAE		naturalized	
Echinochloa muricata (P. Beauv.) Fernald	POACEAE		native	
Echinochloa muricata (P. Beauv.) Fernald var. microstachya Wiegand	POACEAE		native	
Echinochloa oryzoides (Ard.) Fritsch	POACEAE		naturalized	
Echinodorus berteroi (Spreng.) Fassett	ALISMATACEAE		native	
Echium candicans L. f.	BORAGINACEAE	PRIDE OF MADEIRA	naturalized	
Echium pininana Webb & Berthel.	BORAGINACEAE	TOWER OF JEWELS	naturalized	
Echium plantagineum L.	BORAGINACEAE	SALVATION JANE	naturalized	
Eclipta prostrata (L.) L.	ASTERACEAE	FALSE DAISY	native	
Egeria densa Planch.	HYDROCHARITACEAE		naturalized	
Ehrendorferia chrysantha (Hook. & Arn.) Rylander	PAPAVERACEAE	GOLDEN EARDROPS	native	
Ehrendorferia ochroleuca (Engelm.) Fukuhara	PAPAVERACEAE	WHITE EARDROPS	native	
Ehrharta calycina Sm.	POACEAE	PERENNIAL VELDT GRASS	naturalized	
Ehrharta erecta Lam.	POACEAE	PANIC VELDT GRASS	naturalized	
Ehrharta longiflora Sm.	POACEAE	ANNUAL VELDT GRASS	naturalized	
Eichhornia crassipes (Mart.) Solms	PONTEDERIACEAE		naturalized	
Elaeagnus angustifolia L.	ELAEAGNACEAE	RUSSIAN OLIVE	naturalized	
Elatine ambigua Wight	ELATINACEAE		naturalized	
Elatine brachysperma A. Gray	ELATINACEAE		native	
Elatine californica A. Gray	ELATINACEAE		native	
Elatine chilensis Gay	ELATINACEAE		native	
Elatine heterandra H. Mason	ELATINACEAE		native	
Elatine rubella Rydb.	ELATINACEAE		native	
Eleocharis acicularis (L.) Roem. & Schult.	CYPERACEAE	NEEDLE SPIKERUSH	native	
Eleocharis acicularis (L.) Roem. & Schult. var. acicularis	CYPERACEAE		native	
Eleocharis acicularis (L.) Roem. & Schult. var. gracilescens Svenson	CYPERACEAE		native	
Eleocharis acicularis (L.) Roem. & Schult. var. occidentalis Svenson	CYPERACEAE		native	
Eleocharis atropurpurea (Retz.) J. Presl & C. Presl	CYPERACEAE		native	
Eleocharis bella (Piper) Svenson	CYPERACEAE		native	
Eleocharis bernardina (Munz & I. M. Johnst.) Munz & I. M. Johnst.	CYPERACEAE		native	
Eleocharis bolanderi A. Gray	CYPERACEAE		native	
Eleocharis coloradoensis (Britton) Gilly	CYPERACEAE		native	
Eleocharis decumbens C. B. Clarke	CYPERACEAE		native	
Eleocharis engelmannii Steud.	CYPERACEAE		native	
Eleocharis engelmannii Steud. var. detonsa A. Gray	CYPERACEAE		native	
Eleocharis engelmannii Steud. var. engelmannii	CYPERACEAE		native	
Eleocharis flavescens (Poir.) Urb.	CYPERACEAE		native	
Eleocharis flavescens (Poir.) Urb. var. flavescens	CYPERACEAE		native	
Eleocharis geniculata (L.) Roem. & Schult.	CYPERACEAE		native	
Eleocharis macrostachya Britton	CYPERACEAE		native	
Eleocharis montevidensis Kunth	CYPERACEAE		native	
Eleocharis obtusa (Willd.) Schult.	CYPERACEAE		native	
Eleocharis ovata (Roth) Roem. & Schult.	CYPERACEAE		native	
Eleocharis pachycarpa E. Desv.	CYPERACEAE		naturalized	
Eleocharis palustris (L.) Roem. & Schult.	CYPERACEAE		native	
Eleocharis parishii Britton	CYPERACEAE		native	
Eleocharis parvula (Roem. & Schult.) Link ex Bluff, Nees & Schauer	CYPERACEAE	SMALL SPIKERUSH	native	
Eleocharis quadrangulata (Michx.) Roem. & Schult.	CYPERACEAE	SQUARESTEM SPIKERUSH	naturalized	
Eleocharis quinqueflora (Hartmann) O. Schwarz	CYPERACEAE		native	
Eleocharis radicans (Poir.) Kunth	CYPERACEAE		native	
Eleocharis rostellata (Torr.) Torr.	CYPERACEAE		native	
Eleocharis suksdorfiana Beauverd	CYPERACEAE		native	
Eleocharis torticulmis S. G. Sm.	CYPERACEAE	CALIFORNIA TWISTED SPIKERUSH	native	
Eleusine coracana (L.) Gaertn.	POACEAE		naturalized	
Eleusine coracana (L.) Gaertn. subsp. africana (Kenn.-O'Byrne) Hilu & de Wet	POACEAE	AFRICAN FINGER MILLET	naturalized	
Eleusine indica (L.) Gaertn.	POACEAE	INDIA GOOSE GRASS	naturalized	
Eleusine tristachya (Lam.) Lam.	POACEAE	THREE-SPIKED GOOSE GRASS	naturalized	
Elodea bifoliata H. St. John	HYDROCHARITACEAE	TWO-LEAF WATERWEED	native	
Elodea canadensis Michx.	HYDROCHARITACEAE	COMMON WATERWEED	native	
Elodea nuttallii (Planch.) H. St. John	HYDROCHARITACEAE	NUTTALL'S WATERWEED	native	
Elymus californicus (Bol. ex Thurb.) Gould	POACEAE	CALIFORNIA BOTTLE-BRUSH GRASS	native	
Elymus caput-medusae L.	POACEAE	MEDUSA HEAD	naturalized	
Elymus cinereus Scribn. & Merr.	POACEAE	GREAT BASIN WILD-RYE	native	
Elymus condensatus J. Presl	POACEAE	GIANT WILD-RYE	native	
Elymus elymoides (Raf.) Swezey	POACEAE	SQUIRRELTAIL	native	
Elymus elymoides (Raf.) Swezey var. brevifolius (J. G. Sm.) Dorn	POACEAE		native	
Elymus elymoides (Raf.) Swezey var. californicus (J.G. Sm.) J.P. Sm.	POACEAE		native	
Elymus elymoides (Raf.) Swezey var. elymoides	POACEAE		native	
Elymus farctus (Viv.) Runemark ex Melderis	POACEAE		naturalized	
Elymus farctus (Viv.) Runemark ex Melderis subsp. boreo-atlanticus (Simonet & Guin.) Melderis	POACEAE		naturalized	
Elymus glaucus Buckley	POACEAE	WESTERN WILD-RYE	native	
Elymus glaucus Buckley subsp. glaucus	POACEAE		native	
Elymus glaucus Buckley subsp. virescens (Piper) Gould	POACEAE		native	
Elymus hispidus (Opiz) Melderis	POACEAE		naturalized	
Elymus lanceolatus (Scribn. & J. G. Sm.) Gould	POACEAE		native	
Elymus lanceolatus (Scribn. & J. G. Sm.) Gould subsp. lanceolatus	POACEAE	THICK-SPIKE WHEAT GRASS	native	
Elymus mollis Trin. subsp. mollis	POACEAE	SEA LYME GRASS	native	
Elymus multisetus (J. G. Sm.) Burtt Davy	POACEAE	BIG SQUIRRELTAIL	native	
Elymus pacificus Gould	POACEAE	PACIFIC WILD-RYE	native	
Elymus ponticus	POACEAE	TALL WHEAT GRASS	naturalized	
Elymus repens (L.) Gould	POACEAE	QUACK GRASS	naturalized	
Elymus salina M. E. Jones	POACEAE	SALINA PASS WILD-RYE	native	
Elymus scribneri (Vasey) M. E. Jones	POACEAE	SCRIBNER'S WHEAT GRASS	native	
Elymus sierrae Gould	POACEAE		native	
Elymus smithii (Rydb.) Gould	POACEAE	WESTERN WHEAT GRASS	native	
Elymus spicatus (Pursh) Gould	POACEAE	BLUE BUNCH WHEAT GRASS	native	
Elymus stebbinsii Gould	POACEAE	STEBBINS' WHEAT GRASS	native	
Elymus trachycaulus (Link) Shinners	POACEAE		native	
Elymus trachycaulus (Link) Shinners subsp. trachycaulus	POACEAE	SLENDER WHEAT GRASS	native	
Elymus triticoides Buckley	POACEAE	BEARDLESS WILD RYE	native	
Emex australis Steinh.	POLYGONACEAE	SOUTHERN THREE-CORNERED JACK	naturalized	
Emex spinosa (L.) Campd.	POLYGONACEAE	DEVIL'S THORN	naturalized	
Emmenanthe penduliflora Benth.	BORAGINACEAE	WHISPERING BELLS	native	
Emmenanthe penduliflora Benth. var. penduliflora	BORAGINACEAE		native	
Emmenanthe penduliflora Benth. var. rosea Brand	BORAGINACEAE		native	
Empetrum nigrum L.	ERICACEAE	BLACK CROWBERRY	native	
Encelia actoni Elmer	ASTERACEAE		native	
Encelia californica Nutt.	ASTERACEAE		native	
Encelia farinosa A. Gray ex Torr.	ASTERACEAE	BRITTLEBUSH	native	
Encelia frutescens (A. Gray) A. Gray	ASTERACEAE		native	
Encelia virginensis A. Nelson	ASTERACEAE		native	
Enceliopsis covillei (A. Nelson) S. F. Blake	ASTERACEAE	PANAMINT DAISY	native	
Enceliopsis nudicaulis (A. Gray) A. Nelson	ASTERACEAE	NAKED-STEMMED DAISY	native	
Enemion occidentale (Hook. & Arn.) J. R. Drumm. & Hutch.	RANUNCULACEAE	WESTERN RUE-ANEMONE	native	
Enemion stipitatum (A. Gray) J. R. Drumm. & Hutch.	RANUNCULACEAE	SISKIYOU RUE-ANEMONE	native	
Enneapogon desvauxii P. Beauv.	POACEAE	NINE-AWNED PAPPUS GRASS	native	
Ephedra aspera Engelm. ex S. Watson	EPHEDRACEAE	BOUNDARY EPHEDRA	native	
Ephedra californica S. Watson	EPHEDRACEAE	DESERT TEA	native	
Ephedra foeminea Forssk.	EPHEDRACEAE		naturalized	
Ephedra funerea Coville & C. V. Morton	EPHEDRACEAE	DEATH VALLEY EPHEDRA	native	
Ephedra nevadensis S. Watson	EPHEDRACEAE	NEVADA EPHEDRA	native	
Ephedra trifurca Torr. ex S. Watson	EPHEDRACEAE	LONGLEAF EPHEDRA	native	
Ephedra viridis Coville	EPHEDRACEAE	GREEN EPHEDRA	native	
Epilobium anagallidifolium Lam.	ONAGRACEAE		native	
Epilobium brachycarpum C. Presl	ONAGRACEAE		native	
Epilobium campestre (Jeps.) Hoch & W.L. Wagner	ONAGRACEAE		native	
Epilobium canum (Greene) P. H. Raven	ONAGRACEAE	ZAUSCHNERIA	native	
Epilobium canum (Greene) P. H. Raven subsp. canum	ONAGRACEAE		native	
Epilobium canum (Greene) P. H. Raven subsp. garrettii (A. Nelson) P. H. Raven	ONAGRACEAE		native	
Epilobium canum (Greene) P. H. Raven subsp. latifolium (Hook.) P. H. Raven	ONAGRACEAE		native	
Epilobium ciliatum Raf.	ONAGRACEAE		native	
Epilobium ciliatum Raf. subsp. ciliatum	ONAGRACEAE		native	
Epilobium ciliatum Raf. subsp. glandulosum (Lehm.) Hoch & P. H. Raven	ONAGRACEAE		native	
Epilobium ciliatum Raf. subsp. watsonii (Barbey) Hoch & P. H. Raven	ONAGRACEAE		native	
Epilobium clavatum Trel.	ONAGRACEAE		native	
Epilobium cleistogamum (Curran) Hoch & P. H. Raven	ONAGRACEAE		native	
Epilobium densiflorum (Lindl.) Hoch & P. H. Raven	ONAGRACEAE		native	
Epilobium foliosum (Torr. & A. Gray) Suksd.	ONAGRACEAE		native	
Epilobium glaberrimum Barbey	ONAGRACEAE		native	
Epilobium glaberrimum Barbey subsp. fastigiatum (Nutt.) Hoch & P. H. Raven	ONAGRACEAE		native	
Epilobium glaberrimum Barbey subsp. glaberrimum	ONAGRACEAE		native	
Epilobium hallianum Hausskn.	ONAGRACEAE		native	
Epilobium hornemannii Rchb.	ONAGRACEAE		native	
Epilobium hornemannii Rchb. subsp. hornemannii	ONAGRACEAE		native	
Epilobium howellii Hoch	ONAGRACEAE	SUBALPINE FIREWEED	native	
Epilobium lactiflorum Hausskn.	ONAGRACEAE		native	
Epilobium leptophyllum Raf.	ONAGRACEAE		naturalized	
Epilobium luteum Pursh	ONAGRACEAE	YELLOW WILLOWHERB	native	
Epilobium minutum Lindl.	ONAGRACEAE		native	
Epilobium nivium Brandegee	ONAGRACEAE	SNOW MOUNTAIN WILLOWHERB	native	
Epilobium obcordatum A. Gray	ONAGRACEAE		native	
Epilobium oreganum Greene	ONAGRACEAE	OREGON FIREWEED	native	
Epilobium oregonense Hausskn.	ONAGRACEAE		native	
Epilobium pallidum (Eastw.) Hoch & P. H. Raven	ONAGRACEAE		native	
Epilobium palustre L.	ONAGRACEAE	MARSH WILLOWHERB	native	
Epilobium rigidum Hausskn.	ONAGRACEAE	SISKIYOU MOUNTAINS WILLOWHERB	native	
Epilobium saximontanum Hausskn.	ONAGRACEAE		native	
Epilobium septentrionale (D. D. Keck) R. N. Bowman & Hoch	ONAGRACEAE	HUMBOLDT COUNTY FUCHSIA	native	
Epilobium siskiyouense (Munz) Hoch & P. H. Raven	ONAGRACEAE	SISKIYOU FIREWEED	native	
Epilobium torreyi (S. Watson) Hoch & P. H. Raven	ONAGRACEAE		native	
Epipactis gigantea Douglas	ORCHIDACEAE	STREAM ORCHID	native	
Epipactis helleborine (L.) Crantz	ORCHIDACEAE	BROAD-LEAVED HELLEBORINE	naturalized	
Equisetum arvense L.	EQUISETACEAE	COMMON HORSETAIL	native	
Equisetum hyemale L.	EQUISETACEAE		native	
Equisetum hyemale L. subsp. affine (Engelm.) Calder & Roy L. Taylor	EQUISETACEAE	COMMON SCOURING RUSH	native	
Equisetum laevigatum A. Braun	EQUISETACEAE	SMOOTH SCOURING RUSH	native	
Equisetum palustre L.	EQUISETACEAE	MARSH HORSETAIL	native	
Equisetum telmateia Ehrh.	EQUISETACEAE		native	
Equisetum telmateia Ehrh. subsp. braunii (J. Milde) Hauke	EQUISETACEAE	GIANT HORSETAIL	native	
Eragrostis barrelieri Daveau	POACEAE	MEDITERRANEAN LOVE GRASS	naturalized	
Eragrostis cilianensis (All.) Vignolo ex Janch.	POACEAE	STINK GRASS	naturalized	
Eragrostis curvula (Schrad.) Nees	POACEAE	WEEPING LOVE GRASS	naturalized	
Eragrostis hypnoides (Lam.) Britton, Sterns & Poggenb.	POACEAE	CREEPING LOVE GRASS	native	
Eragrostis lehmanniana Nees	POACEAE	LEHMANN'S LOVE GRASS	naturalized	
Eragrostis lutescens Scribn.	POACEAE	SIX-WEEKS LOVE GRASS	native	
Eragrostis mexicana (Hornem.) Link	POACEAE		native	
Eragrostis mexicana (Hornem.) Link subsp. mexicana	POACEAE	MEXICAN LOVE GRASS	native	
Eragrostis mexicana (Hornem.) Link subsp. virescens (J. Presl) S. D. Koch & Sánchez Vega	POACEAE	CHILEAN LOVE GRASS	native	
Eragrostis minor Host	POACEAE	LITTLE LOVE GRASS	naturalized	
Eragrostis pectinacea (Michx.) Nees	POACEAE		native	
Eragrostis pectinacea (Michx.) Nees var. miserrima (E. Fourn.) Reeder	POACEAE	GULF LOVE GRASS	native	
Eragrostis pectinacea (Michx.) Nees var. pectinacea	POACEAE	CAROLINA LOVE GRASS	native	
Eragrostis pilosa (L.) P. Beauv.	POACEAE		naturalized	
Eragrostis pilosa (L.) P. Beauv. var. pilosa	POACEAE		naturalized	
Eremalche exilis (A. Gray) Greene	MALVACEAE	WHITE MALLOW	native	
Eremalche parryi (Greene) Greene	MALVACEAE		native	
Eremalche parryi (Greene) Greene subsp. kernensis (C. B. Wolf) D. M. Bates	MALVACEAE	KERN MALLOW	native	
Eremalche parryi (Greene) Greene subsp. parryi	MALVACEAE	PARRY'S MALLOW	native	
Eremalche rotundifolia (A. Gray) Greene	MALVACEAE	DESERT FIVESPOT	native	
Eremogone aculeata (S. Watson) Ikonn.	CARYOPHYLLACEAE	PRICKLY SANDWORT	native	
Eremogone cliftonii Rabeler & R. L. Hartm.	CARYOPHYLLACEAE	CLIFTON'S SANDWORT	native	
Eremogone congesta (Nutt.) Ikonn.	CARYOPHYLLACEAE	BALLHEAD SANDWORT	native	
Eremogone congesta (Nutt.) Ikonn. var. charlestonensis (Maguire) R. L. Hartm. & Rabeler	CARYOPHYLLACEAE	CHARLESTON SANDWORT	native	
Eremogone congesta (Nutt.) Ikonn. var. congesta	CARYOPHYLLACEAE		native	
Eremogone congesta (Nutt.) Ikonn. var. crassula (Maguire) R. L. Hartm. & Rabeler	CARYOPHYLLACEAE		native	
Eremogone congesta (Nutt.) Ikonn. var. simulans (Maguire) R. L. Hartm. & Rabeler	CARYOPHYLLACEAE		native	
Eremogone congesta (Nutt.) Ikonn. var. subcongesta (S. Watson) R. L. Hartm. & Rabeler	CARYOPHYLLACEAE		native	
Eremogone congesta (Nutt.) Ikonn. var. suffrutescens (A. Gray) R. L. Hartm. & Rabeler	CARYOPHYLLACEAE	SUFFRUTESCENT SANDWORT	native	
Eremogone ferrisiae (Abrams) R. L. Hartm. & Rabeler	CARYOPHYLLACEAE	FERRIS' SANDWORT	native	
Eremogone kingii (S. Watson) Ikonn.	CARYOPHYLLACEAE		native	
Eremogone kingii (S. Watson) Ikonn. var. glabrescens (S. Watson) Dorn	CARYOPHYLLACEAE	KING'S SANDWORT	native	
Eremogone macradenia (S. Watson) Ikonn.	CARYOPHYLLACEAE	DESERT SANDWORT	native	
Eremogone macradenia (S. Watson) Ikonn. var. arcuifolia (Maguire) R. L. Hartm. & Rabeler	CARYOPHYLLACEAE		native	
Eremogone macradenia (S. Watson) Ikonn. var. macradenia	CARYOPHYLLACEAE		native	
Eremogone ursina (B.L. Rob.) Ikonn.	CARYOPHYLLACEAE	BIG BEAR VALLEY SANDWORT	native	
Eremothera boothii (Douglas) W.L. Wagner & Hoch	ONAGRACEAE		native	
Eremothera boothii (Douglas) W.L. Wagner & Hoch subsp. alyssoides (Hook. & Arn.) W.L. Wagner & Hoch	ONAGRACEAE	PINE CREEK EVENING-PRIMROSE	native	
Eremothera boothii (Douglas) W.L. Wagner & Hoch subsp. boothii	ONAGRACEAE	BOOTH'S EVENING-PRIMROSE	native	
Eremothera boothii (Douglas) W.L. Wagner & Hoch subsp. condensata (Munz) W.L. Wagner & Hoch	ONAGRACEAE		native	
Eremothera boothii (Douglas) W.L. Wagner & Hoch subsp. decorticans (Hook. & Arn.) W.L. Wagner & Hoch	ONAGRACEAE	SHREDDING EVENING-PRIMROSE	native	
Eremothera boothii (Douglas) W.L. Wagner & Hoch subsp. desertorum (Munz) W.L. Wagner & Hoch	ONAGRACEAE		native	
Eremothera boothii (Douglas) W.L. Wagner & Hoch subsp. intermedia (Munz) W.L. Wagner & Hoch	ONAGRACEAE	BOOTH'S HAIRY EVENING-PRIMROSE	native	
Eremothera chamaenerioides (A. Gray) W.L. Wagner & Hoch	ONAGRACEAE		native	
Eremothera minor (A. Nelson) W.L. Wagner & Hoch	ONAGRACEAE	NELSON'S EVENING-PRIMROSE	native	
Eremothera refracta (S. Watson) W.L. Wagner & Hoch	ONAGRACEAE		native	
Eriastrum abramsii (Elmer) H. Mason	POLEMONIACEAE		native	
Eriastrum brandegeeae H. Mason	POLEMONIACEAE	BRANDEGEE'S ERIASTRUM	native	
Eriastrum densifolium (Benth.) H. Mason	POLEMONIACEAE		native	
Eriastrum densifolium (Benth.) H. Mason subsp. austromontanum (T. T. Craig) H. Mason	POLEMONIACEAE		native	
Eriastrum densifolium (Benth.) H. Mason subsp. densifolium	POLEMONIACEAE		native	
Eriastrum densifolium (Benth.) H. Mason subsp. elongatum (Benth.) H. Mason	POLEMONIACEAE		native	
Eriastrum densifolium (Benth.) H. Mason subsp. mohavense (T. T. Craig) H. Mason	POLEMONIACEAE		native	
Eriastrum densifolium (Benth.) H. Mason subsp. sanctorum (Milliken) H. Mason	POLEMONIACEAE	SANTA ANA RIVER WOOLLYSTAR	native	
Eriastrum diffusum (A. Gray) H. Mason	POLEMONIACEAE		native	
Eriastrum eremicum (Jeps.) H. Mason	POLEMONIACEAE		native	
Eriastrum eremicum (Jeps.) H. Mason subsp. eremicum	POLEMONIACEAE		native	
Eriastrum filifolium (Nutt.) Wooton & Standl.	POLEMONIACEAE		native	
Eriastrum harwoodii (T.T. Craig) D. Gowen	POLEMONIACEAE		native	
Eriastrum hooveri (Jeps.) H. Mason	POLEMONIACEAE	HOOVER'S ERIASTRUM	native	
Eriastrum luteum (Benth.) H. Mason	POLEMONIACEAE	YELLOW-FLOWERED ERIASTRUM	native	
Eriastrum pluriflorum (A. Heller) H. Mason	POLEMONIACEAE		native	
Eriastrum pluriflorum (A. Heller) H. Mason subsp. pluriflorum	POLEMONIACEAE	MANY-FLOWERED ERIASTRUM	native	
Eriastrum pluriflorum (A. Heller) H. Mason subsp. sherman-hoytiae (T. T. Craig) H. Mason	POLEMONIACEAE		native	
Eriastrum sapphirinum (Eastw.) H. Mason	POLEMONIACEAE		native	
Eriastrum sapphirinum (Eastw.) H. Mason subsp. dasyanthum (Brand) H. Mason	POLEMONIACEAE		native	
Eriastrum sapphirinum (Eastw.) H. Mason subsp. sapphirinum	POLEMONIACEAE		native	
Eriastrum signatum D. Gowen	POLEMONIACEAE		native	
Eriastrum sparsiflorum (Eastw.) H. Mason	POLEMONIACEAE		native	
Eriastrum sparsiflorum (Eastw.) H. Mason subsp. harwoodii (T. T. Craig) H. K. Harrison	POLEMONIACEAE		native	
Eriastrum virgatum (Benth.) H. Mason	POLEMONIACEAE	VIRGATE ERIASTRUM	native	
Eriastrum wilcoxii (A. Nelson) H. Mason	POLEMONIACEAE		native	
Erica lusitanica Rudolphi	ERICACEAE		naturalized	
Ericameria albida (M. E. Jones ex A. Gray) L. C. Anderson	ASTERACEAE	WHITE-FLOWERED RABBITBRUSH	native	
Ericameria arborescens (A. Gray) Greene	ASTERACEAE	GOLDEN-FLEECE	native	
Ericameria bloomeri (A. Gray) J. F. Macbr.	ASTERACEAE	BLOOMER'S GOLDENBUSH	native	
Ericameria brachylepis (A. Gray) H. M. Hall	ASTERACEAE	BOUNDARY GOLDENBUSH	native	
Ericameria cooperi (A. Gray) H. M. Hall	ASTERACEAE		native	
Ericameria cooperi (A. Gray) H. M. Hall var. cooperi	ASTERACEAE	COOPER'S GOLDENBUSH	native	
Ericameria cuneata (A. Gray) McClatchie	ASTERACEAE	WEDGELEAF GOLDENBUSH	native	
Ericameria cuneata (A. Gray) McClatchie var. cuneata	ASTERACEAE	CLIFF GOLDENBUSH	native	
Ericameria cuneata (A. Gray) McClatchie var. macrocephala Urbatsch	ASTERACEAE	LAGUNA MOUNTAINS GOLDENBUSH	native	
Ericameria cuneata (A. Gray) McClatchie var. spathulata (A. Gray) H. M. Hall	ASTERACEAE		native	
Ericameria discoidea (Nutt.) G. L. Nesom	ASTERACEAE	WHITESTEM GOLDENBUSH	native	
Ericameria ericoides (Less.) Nutt. ex Jeps.	ASTERACEAE	CALIFORNIA GOLDENBUSH	native	
Ericameria fasciculata (Eastw.) J. F. Macbr.	ASTERACEAE	EASTWOOD'S GOLDENBUSH	native	
Ericameria gilmanii (S. F. Blake) G. L. Nesom	ASTERACEAE	GILMAN'S GOLDENBUSH	native	
Ericameria greenei (A. Gray) G. L. Nesom	ASTERACEAE	GREENE'S GOLDENBUSH	native	
Ericameria laricifolia (A. Gray) Shinners	ASTERACEAE	TURPENTINE-BRUSH	native	
Ericameria linearifolia (DC.) Urbatsch & Wussow	ASTERACEAE	INTERIOR GOLDENBUSH	native	
Ericameria nana Nutt.	ASTERACEAE	DWARF GOLDENBUSH	native	
Ericameria nauseosa (Pall.) G. L. Nesom & G. I. Baird	ASTERACEAE	RUBBER RABBITBRUSH	native	
Ericameria nauseosa (Pall.) G. L. Nesom & G. I. Baird var. bernardina (H. M. Hall) G. L. Nesom & G. I. Baird	ASTERACEAE	BERNARDINA RABBITBRUSH	native	
Ericameria nauseosa (Pall.) G. L. Nesom & G. I. Baird var. ceruminosa (Durand & Hilg.) G. L. Nesom & G. I. Baird	ASTERACEAE	DESERT RABBITBRUSH	native	
Ericameria nauseosa (Pall.) G. L. Nesom & G. I. Baird var. hololeuca (A. Gray) G. L. Nesom & G. I. Baird	ASTERACEAE	WHITE RABBITBRUSH	native	
Ericameria nauseosa (Pall.) G. L. Nesom & G. I. Baird var. leiosperma (A. Gray) G. L. Nesom & G. I. Baird	ASTERACEAE	SMOOTH-FRUIT RABBITBRUSH	native	
Ericameria nauseosa (Pall.) G. L. Nesom & G. I. Baird var. mohavensis (Greene) G. L. Nesom & G. I. Baird	ASTERACEAE	MOJAVE RABBITBRUSH	native	
Ericameria nauseosa (Pall.) G. L. Nesom & G. I. Baird var. oreophila (A. Nelson) G. L. Nesom & G. I. Baird	ASTERACEAE	GREAT BASIN RABBITBRUSH	native	
Ericameria nauseosa (Pall.) G. L. Nesom & G. I. Baird var. speciosa (Nutt.) G. L. Nesom & G. I. Baird	ASTERACEAE	SHOWY RABBITBRUSH	native	
Ericameria nauseosa (Pall.) G. L. Nesom & G. I. Baird var. washoensis (L. C. Anderson) G. L. Nesom & G. I. Baird	ASTERACEAE	WASHOE RABBITBRUSH	native	
Ericameria ophitidis (J. T. Howell) G. L. Nesom	ASTERACEAE	SERPENTINE GOLDENBUSH	native	
Ericameria palmeri (A. Gray) H. M. Hall	ASTERACEAE		native	
Ericameria palmeri (A. Gray) H. M. Hall var. pachylepis (H. M. Hall) G. L. Nesom	ASTERACEAE	THICKBRACTED GOLDENBUSH	native	
Ericameria palmeri (A. Gray) H. M. Hall var. palmeri	ASTERACEAE	PALMER'S GOLDENBUSH	native	
Ericameria paniculata (A. Gray) Rydb.	ASTERACEAE	BLACK-BANDED RABBITBRUSH	native	
Ericameria parishii (Greene) H. M. Hall	ASTERACEAE		native	
Ericameria parishii (Greene) H. M. Hall var. parishii	ASTERACEAE	PARISH'S GOLDENBUSH	native	
Ericameria parryi (A. Gray) G. L. Nesom & G. I. Baird	ASTERACEAE	PARRY'S GOLDENBUSH	native	
Ericameria parryi (A. Gray) G. L. Nesom & G. I. Baird var. aspera (Greene) G. L. Nesom & G. I. Baird	ASTERACEAE	ROUGH RABBITBRUSH	native	
Ericameria parryi (A. Gray) G. L. Nesom & G. I. Baird var. imula (H. M. Hall & Clem.) G. L. Nesom & G. I. Baird	ASTERACEAE	LOW RABBITBRUSH	native	
Ericameria parryi (A. Gray) G. L. Nesom & G. I. Baird var. latior (H. M. Hall & Clem.) G. L. Nesom & G. I. Baird	ASTERACEAE	WIDELEAF RABBITBRUSH	native	
Ericameria parryi (A. Gray) G. L. Nesom & G. I. Baird var. monocephala (A. Nelson & P. B. Kenn.) G. L. Nesom & G. I. Baird	ASTERACEAE	ONE-HEADED RABBITBRUSH	native	
Ericameria parryi (A. Gray) G. L. Nesom & G. I. Baird var. nevadensis (A. Gray) G. L. Nesom & G. I. Baird	ASTERACEAE	NEVADA RABBITBRUSH	native	
Ericameria parryi (A. Gray) G. L. Nesom & G. I. Baird var. vulcanica (Greene) G. L. Nesom & G. I. Baird	ASTERACEAE	VULCAN RABBITBRUSH	native	
Ericameria pinifolia (A. Gray) H. M. Hall	ASTERACEAE	PINE-BUSH	native	
Ericameria suffruticosa (Nutt.) Nesom	ASTERACEAE	SINGLEHEAD GOLDENBUSH	native	
Ericameria teretifolia (Durand & Hilg.) Jeps.	ASTERACEAE	ROUND-LEAF RABBITBRUSH	native	
Erigeron aequifolius H. M. Hall	ASTERACEAE	HALL'S DAISY	native	
Erigeron algidus Jeps.	ASTERACEAE	SIERRA FLEABANE	native	
Erigeron aliceae Howell	ASTERACEAE	ALICE EASTWOOD'S FLEABANE	native	
Erigeron annuus (L.) Pers.	ASTERACEAE	ANNUAL FLEABANE	naturalized	
Erigeron aphanactis (A. Gray) Greene	ASTERACEAE	RAYLESS SHAGGY FLEABANE	native	
Erigeron aphanactis (A. Gray) Greene var. aphanactis	ASTERACEAE		native	
Erigeron aphanactis (A. Gray) Greene var. congestus (Greene) Cronquist	ASTERACEAE		native	
Erigeron argentatus A. Gray	ASTERACEAE	SILVER FLEABANE	native	
Erigeron barbellulatus Greene	ASTERACEAE	SHINING FLEABANE	native	
Erigeron biolettii Greene	ASTERACEAE	STREAMSIDE DAISY	native	
Erigeron blochmaniae Greene	ASTERACEAE	BLOCHMAN'S LEAFY DAISY	native	
Erigeron bloomeri A. Gray	ASTERACEAE	BLOOMER'S FLEABANE	native	
Erigeron bloomeri A. Gray var. bloomeri	ASTERACEAE		native	
Erigeron bloomeri A. Gray var. nudatus (A. Gray) Cronquist	ASTERACEAE	WALDO DAISY	native	
Erigeron bonariensis L.	ASTERACEAE	FLAX-LEAVED HORSEWEED	naturalized	
Erigeron breweri A. Gray	ASTERACEAE	BREWER'S FLEABANE	native	
Erigeron breweri A. Gray var. bisanctus G. L. Nesom	ASTERACEAE		native	
Erigeron breweri A. Gray var. breweri	ASTERACEAE		native	
Erigeron breweri A. Gray var. covillei (Greene) G. L. Nesom	ASTERACEAE		native	
Erigeron breweri A. Gray var. jacinteus (H. M. Hall) Cronquist	ASTERACEAE	SAN JACINTO MOUNTAINS DAISY	native	
Erigeron breweri A. Gray var. porphyreticus (M. E. Jones) Cronquist	ASTERACEAE		native	
Erigeron calvus Coville	ASTERACEAE	BALD DAISY	native	
Erigeron canadensis L.	ASTERACEAE	HORSEWEED	native	
Erigeron cervinus Greene	ASTERACEAE	SISKIYOU DAISY	native	
Erigeron chrysopsidis A. Gray	ASTERACEAE		native	
Erigeron chrysopsidis A. Gray var. austiniae (Greene) G. L. Nesom	ASTERACEAE	DWARF YELLOW FLEABANE	native	
Erigeron clokeyi Cronquist	ASTERACEAE		native	
Erigeron clokeyi Cronquist var. pinzliae G. L. Nesom	ASTERACEAE	PINZL'S FLEABANE	native	
Erigeron compactus S. F. Blake	ASTERACEAE	COMPACT DAISY	native	
Erigeron compositus Pursh	ASTERACEAE	CUT-LEAF FLEABANE	native	
Erigeron concinnus (Hook. & Arn.) Torr. & A. Gray	ASTERACEAE		native	
Erigeron concinnus (Hook. & Arn.) Torr. & A. Gray var. concinnus	ASTERACEAE	NAVAJO FLEABANE	native	
Erigeron coulteri Porter	ASTERACEAE	COULTER'S FLEABANE	native	
Erigeron divergens Torr. & A. Gray	ASTERACEAE	SPREADING FLEABANE	native	
Erigeron eatonii A. Gray	ASTERACEAE	EATON'S FLEABANE	native	
Erigeron eatonii A. Gray var. nevadincola (S. F. Blake) G. L. Nesom	ASTERACEAE	NEVADA DAISY	native	
Erigeron eatonii A. Gray var. plantagineus (Greene) Cronquist	ASTERACEAE		native	
Erigeron eatonii A. Gray var. sonnei (Greene) G. L. Nesom	ASTERACEAE		native	
Erigeron elegantulus Greene	ASTERACEAE	VOLCANIC DAISY	native	
Erigeron elmeri (Greene) Greene	ASTERACEAE	ELMER'S FLEABANE	native	
Erigeron filifolius Nutt.	ASTERACEAE	THREAD-LEAF FLEABANE	native	
Erigeron flagellaris A. Gray	ASTERACEAE	TRAILING FLEABANE	native	
Erigeron foliosus Nutt.	ASTERACEAE	LEAFY FLEABANE	native	
Erigeron foliosus Nutt. var. confinis (Howell) Jeps.	ASTERACEAE		native	
Erigeron foliosus Nutt. var. foliosus	ASTERACEAE		native	
Erigeron foliosus Nutt. var. franciscensis G. L. Nesom	ASTERACEAE		native	
Erigeron foliosus Nutt. var. hartwegii (Greene) Jeps.	ASTERACEAE		native	
Erigeron foliosus Nutt. var. mendocinus (Greene) G. L. Nesom	ASTERACEAE		native	
Erigeron glacialis (Nutt.) A. Nelson	ASTERACEAE	SUBALPINE FLEABANE	native	
Erigeron glacialis (Nutt.) A. Nelson var. glacialis	ASTERACEAE		native	
Erigeron glacialis (Nutt.) A. Nelson var. hirsutus (Cronquist) G. L. Nesom	ASTERACEAE		native	
Erigeron glaucus Ker Gawl.	ASTERACEAE	SEASIDE DAISY	native	
Erigeron greenei G. L. Nesom	ASTERACEAE	GREENE'S NARROW-LEAVED DAISY	native	
Erigeron inornatus (A. Gray) A. Gray	ASTERACEAE	WESTERN RAYLESS FLEABANE	native	
Erigeron inornatus (A. Gray) A. Gray var. calidipetris G. L. Nesom	ASTERACEAE	HOT ROCK DAISY	native	
Erigeron inornatus (A. Gray) A. Gray var. inornatus	ASTERACEAE		native	
Erigeron inornatus (A. Gray) A. Gray var. keilii G. L. Nesom	ASTERACEAE	KEIL'S DAISY	native	
Erigeron karvinskianus DC.	ASTERACEAE	SANTA BARBARA DAISY	naturalized	
Erigeron klamathensis (G. L. Nesom) G. L. Nesom	ASTERACEAE	KLAMATH FLEABANE	native	
Erigeron lassenianus Greene	ASTERACEAE	LASSEN FLEABANE	native	
Erigeron lassenianus Greene var. deficiens Cronquist	ASTERACEAE		native	
Erigeron lassenianus Greene var. lassenianus	ASTERACEAE		native	
Erigeron linearis (Hook.) Piper	ASTERACEAE	DESERT YELLOW FLEABANE	native	
Erigeron lobatus A. Nelson	ASTERACEAE		native	
Erigeron lonchophyllus Hook.	ASTERACEAE	SHORT-RAYED FLEABANE	native	
Erigeron maniopotamicus G. L. Nesom & T. W. Nelson	ASTERACEAE	MAD RIVER FLEABANE DAISY	native	
Erigeron mariposanus Congdon	ASTERACEAE	MARIPOSA DAISY	native	
Erigeron miser A. Gray	ASTERACEAE	STARVED DAISY	native	
Erigeron multiceps Greene	ASTERACEAE	KERN RIVER DAISY	native	
Erigeron nivalis Nutt.	ASTERACEAE	SNOW FLEABANE DAISY	native	
Erigeron oxyphyllus Greene	ASTERACEAE	WAND-LIKE FLEABANE DAISY	native	
Erigeron parishii A. Gray	ASTERACEAE	PARISH'S DAISY	native	
Erigeron petrophilus Greene	ASTERACEAE	ROCK-LOVING FLEABANE	native	
Erigeron petrophilus Greene var. petrophilus	ASTERACEAE		native	
Erigeron petrophilus Greene var. sierrensis G. L. Nesom	ASTERACEAE	NORTHERN SIERRA DAISY	native	
Erigeron petrophilus Greene var. viscidulus (A. Gray) G. L. Nesom	ASTERACEAE	KLAMATH ROCK DAISY	native	
Erigeron philadelphicus L.	ASTERACEAE		native	
Erigeron philadelphicus L. var. philadelphicus	ASTERACEAE	PHILADELPHIA FLEABANE	native	
Erigeron pumilus Nutt.	ASTERACEAE		native	
Erigeron pumilus Nutt. var. intermedius (Cronquist) S. L. Welsh	ASTERACEAE	SHAGGY FLEABANE	native	
Erigeron pygmaeus (A. Gray) Greene	ASTERACEAE	PYGMY FLEABANE	native	
Erigeron reductus (Cronquist) G. L. Nesom	ASTERACEAE	LITTLE RAYLESS FLEABANE	native	
Erigeron reductus (Cronquist) G. L. Nesom var. angustatus (A. Gray) G. L. Nesom	ASTERACEAE		native	
Erigeron reductus (Cronquist) G. L. Nesom var. reductus	ASTERACEAE	CALIFORNIA RAYLESS DAISY	native	
Erigeron robustior (Cronquist) G. L. Nesom	ASTERACEAE	ROBUST DAISY	native	
Erigeron sanctarum S. Watson	ASTERACEAE	SAINTS' DAISY	native	
Erigeron serpentinus G. L. Nesom	ASTERACEAE	SERPENTINE DAISY	native	
Erigeron strigosus Willd.	ASTERACEAE		naturalized	
Erigeron strigosus Willd. var. strigosus	ASTERACEAE	PRAIRIE FLEABANE	naturalized	
Erigeron sumatrensis Retz.	ASTERACEAE	TROPICAL HORSEWEED	naturalized	
Erigeron supplex A. Gray	ASTERACEAE	SUPPLE DAISY	native	
Erigeron tener (A. Gray) A. Gray	ASTERACEAE	THIN DAISY	native	
Erigeron uncialis S. F. Blake	ASTERACEAE		native	
Erigeron uncialis S. F. Blake var. uncialis	ASTERACEAE	LIMESTONE DAISY	native	
Erigeron utahensis A. Gray	ASTERACEAE	UTAH DAISY	native	
Erigeron vagus Payson	ASTERACEAE	RAMBLING FLEABANE	native	
Eriochloa acuminata (C. Presl) Hitchc. var. acuminata	POACEAE	SUMMER GRASS	native	
Eriochloa acuminata (J. Presl) Kunth	POACEAE		native	
Eriochloa aristata Vasey	POACEAE		naturalized	
Eriochloa aristata Vasey var. aristata	POACEAE	AWNED CUP GRASS	naturalized	
Eriochloa contracta Hitchc.	POACEAE	PRAIRIE CUP GRASS	naturalized	
Eriodictyon altissimum P. V. Wells	BORAGINACEAE	INDIAN KNOB MOUNTAINBALM	native	
Eriodictyon angustifolium Nutt.	BORAGINACEAE	NARROW-LEAVED YERBA SANTA	native	
Eriodictyon californicum (Hook. & Arn.) Torr.	BORAGINACEAE	CALIFORNIA YERBA SANTA	native	
Eriodictyon capitatum Eastw.	BORAGINACEAE	LOMPOC YERBA SANTA	native	
Eriodictyon crassifolium Benth.	BORAGINACEAE		native	
Eriodictyon crassifolium Benth. var. crassifolium	BORAGINACEAE	THICK-LEAVED YERBA SANTA	native	
Eriodictyon crassifolium Benth. var. nigrescens Brand	BORAGINACEAE	BICOLORED YERBA SANTA	native	
Eriodictyon lobbii (A. Gray) Greene	BORAGINACEAE	MATTED YERBA SANTA	native	
Eriodictyon parryi (A. Gray) Greene	BORAGINACEAE	POODLE-DOG BUSH	native	
Eriodictyon tomentosum Benth.	BORAGINACEAE	WOOLLY YERBA SANTA	native	
Eriodictyon traskiae Eastw.	BORAGINACEAE		native	
Eriodictyon traskiae Eastw. subsp. smithii Munz	BORAGINACEAE	SMITH'S YERBA SANTA	native	
Eriodictyon traskiae Eastw. subsp. traskiae	BORAGINACEAE	TRASK'S YERBA SANTA	native	
Eriodictyon trichocalyx A. Heller	BORAGINACEAE		native	
Eriodictyon trichocalyx A. Heller var. lanatum (Brand) Jeps.	BORAGINACEAE	SAN DIEGO YERBA SANTA	native	
Eriodictyon trichocalyx A. Heller var. trichocalyx	BORAGINACEAE	HAIRY YERBA SANTA	native	
Eriogonum alexanderae (Reveal) Grady & Reveal	POLYGONACEAE		native	acceptance uncertain
Eriogonum alpinum Engelm.	POLYGONACEAE	TRINITY BUCKWHEAT	native	
Eriogonum ampullaceum J. T. Howell	POLYGONACEAE	MONO WILD BUCKWHEAT	native	
Eriogonum angulosum Benth.	POLYGONACEAE	ANGLE-STEM WILD BUCKWHEAT	native	
Eriogonum apiculatum S. Watson	POLYGONACEAE	SAN JACINTO WILD BUCKWHEAT	native	
Eriogonum apiculatum S. Watson var. apiculatum	POLYGONACEAE		native	
Eriogonum apricum J. T. Howell	POLYGONACEAE		native	
Eriogonum apricum J. T. Howell var. apricum	POLYGONACEAE	IONE BUCKWHEAT	native	
Eriogonum apricum J. T. Howell var. prostratum Myatt	POLYGONACEAE	IRISH HILL BUCKWHEAT	native	
Eriogonum arborescens Greene	POLYGONACEAE	SANTA CRUZ ISLAND WILD BUCKWHEAT	native	
Eriogonum argillosum J. T. Howell	POLYGONACEAE	CLAY BUCKWHEAT	native	
Eriogonum baileyi S. Watson	POLYGONACEAE		native	
Eriogonum baileyi S. Watson var. baileyi	POLYGONACEAE	BAILEY'S WILD BUCKWHEAT	native	
Eriogonum baileyi S. Watson var. praebens (Gand.) Reveal	POLYGONACEAE	BAILEY'S WOOLLY BUCKWHEAT	native	
Eriogonum bifurcatum Reveal	POLYGONACEAE	FORKED BUCKWHEAT	native	
Eriogonum brachyanthum Coville	POLYGONACEAE	SHORT-FLOWER WILD BUCKWHEAT	native	
Eriogonum brachypodum Torr. & A. Gray	POLYGONACEAE	PARRY'S WILD BUCKWHEAT	native	
Eriogonum breedlovei (J. T. Howell) Reveal	POLYGONACEAE		native	
Eriogonum breedlovei (J. T. Howell) Reveal var. breedlovei	POLYGONACEAE	BREEDLOVE'S BUCKWHEAT	native	
Eriogonum breedlovei (J. T. Howell) Reveal var. shevockii J. T. Howell	POLYGONACEAE	THE NEEDLES BUCKWHEAT	native	
Eriogonum butterworthianum J. T. Howell	POLYGONACEAE	BUTTERWORTH'S BUCKWHEAT	native	
Eriogonum caespitosum Nutt.	POLYGONACEAE	MATTED WILD BUCKWHEAT	native	
Eriogonum callistum Reveal	POLYGONACEAE	TEHACHAPI BUCKWHEAT	native	
Eriogonum cedrorum Reveal & Raiche	POLYGONACEAE	THE CEDARS BUCKWHEAT	native	
Eriogonum cernuum Nutt.	POLYGONACEAE	NODDING WILD BUCKWHEAT	native	
Eriogonum cinereum Benth.	POLYGONACEAE	COASTAL WILD BUCKWHEAT	native	
Eriogonum cithariforme S. Watson	POLYGONACEAE		native	
Eriogonum cithariforme S. Watson var. agninum (Greene) Reveal	POLYGONACEAE	SANTA YNEZ WILD BUCKWHEAT	native	
Eriogonum cithariforme S. Watson var. cithariforme	POLYGONACEAE	CITHARA WILD BUCKWHEAT	native	
Eriogonum clavatum Small	POLYGONACEAE	HOOVER'S DESERT TRUMPET	native	
Eriogonum collinum S. Stokes ex M. E. Jones	POLYGONACEAE	HILL BUCKWHEAT	native	
Eriogonum compositum Douglas ex Benth.	POLYGONACEAE		native	
Eriogonum compositum Douglas ex Benth. var. compositum	POLYGONACEAE	ARROW-LEAF WILD BUCKWHEAT	native	
Eriogonum congdonii (S. Stokes) Reveal	POLYGONACEAE	CONGDON'S BUCKWHEAT	native	
Eriogonum contiguum (Reveal) Reveal	POLYGONACEAE	REVEAL'S BUCKWHEAT	native	
Eriogonum covilleanum Eastw.	POLYGONACEAE	COVILLE'S WILD BUCKWHEAT	native	
Eriogonum crocatum Davidson	POLYGONACEAE	CONEJO BUCKWHEAT	native	
Eriogonum crosbyae Reveal	POLYGONACEAE		native	
Eriogonum dasyanthemum Torr. & A. Gray	POLYGONACEAE	CHAPARRAL WILD BUCKWHEAT	native	
Eriogonum davidsonii Greene ex J. A. Clark	POLYGONACEAE	DAVIDSON'S WILD BUCKWHEAT	native	
Eriogonum deflexum Torr.	POLYGONACEAE	SKELETON WEED	native	
Eriogonum deflexum Torr. var. baratum (Elmer) Reveal	POLYGONACEAE	TALL SKELETON WEED	native	
Eriogonum deflexum Torr. var. deflexum	POLYGONACEAE	FLAT-TOPPED SKELETON WEED	native	
Eriogonum deflexum Torr. var. nevadense Reveal	POLYGONACEAE	NEVADA SKELETON WEED	native	
Eriogonum deserticola S. Watson	POLYGONACEAE	COLORADO DESERT WILD BUCKWHEAT	native	
Eriogonum diclinum Reveal	POLYGONACEAE	JAYNES CANYON BUCKWHEAT	native	
Eriogonum douglasii Benth.	POLYGONACEAE		native	
Eriogonum douglasii Benth. var. meridionale Reveal	POLYGONACEAE	SOUTHERN WILD BUCKWHEAT	native	
Eriogonum eastwoodianum J. T. Howell	POLYGONACEAE	EASTWOOD'S BUCKWHEAT	native	
Eriogonum elatum Douglas ex Benth.	POLYGONACEAE		native	
Eriogonum elatum Douglas ex Benth. var. elatum	POLYGONACEAE	TALL WILD BUCKWHEAT	native	
Eriogonum elatum Douglas ex Benth. var. villosum Jeps.	POLYGONACEAE	TALL WOOLLY WILD BUCKWHEAT	native	
Eriogonum elegans Greene	POLYGONACEAE	ELEGANT WILD BUCKWHEAT	native	
Eriogonum elongatum Benth.	POLYGONACEAE		native	
Eriogonum elongatum Benth. var. elongatum	POLYGONACEAE	LONG-STEM WILD BUCKWHEAT	native	
Eriogonum eremicola J. T. Howell & Reveal	POLYGONACEAE	WILDROSE CANYON BUCKWHEAT	native	
Eriogonum esmeraldense S. Watson	POLYGONACEAE		native	
Eriogonum esmeraldense S. Watson var. esmeraldense	POLYGONACEAE	ESMERALDA WILD BUCKWHEAT	native	
Eriogonum evanidum Reveal	POLYGONACEAE	VANISHING WILD BUCKWHEAT	native	
Eriogonum exaltatum M. E. Jones	POLYGONACEAE	LADDER WILD BUCKWHEAT	native	
Eriogonum fasciculatum Benth.	POLYGONACEAE	CALIFORNIA BUCKWHEAT	native	
Eriogonum fasciculatum Benth. var. fasciculatum	POLYGONACEAE	COASTAL CALIFORNIA BUCKWHEAT	native	
Eriogonum fasciculatum Benth. var. flavoviride Munz & I. M. Johnst.	POLYGONACEAE	SONORAN DESERT CALIFORNIA BUCKWHEAT	native	
Eriogonum fasciculatum Benth. var. foliolosum (Nutt.) S. Stokes ex Abrams	POLYGONACEAE	LEAFY CALIFORNIA BUCKWHEAT	native	
Eriogonum fasciculatum Benth. var. polifolium (Benth.) Torr. & A. Gray	POLYGONACEAE	MOJAVE DESERT CALIFORNIA BUCKWHEAT	native	
Eriogonum giganteum S. Watson	POLYGONACEAE	ST. CATHERINE'S-LACE	native	
Eriogonum giganteum S. Watson var. compactum Dunkle	POLYGONACEAE	SANTA BARBARA ISLAND BUCKWHEAT	native	
Eriogonum giganteum S. Watson var. formosum K. Brandegee	POLYGONACEAE	SAN CLEMENTE ISLAND BUCKWHEAT	native	
Eriogonum giganteum S. Watson var. giganteum	POLYGONACEAE	SANTA CATALINA ISLAND BUCKWHEAT	native	
Eriogonum gilmanii S. Stokes	POLYGONACEAE	GILMAN'S BUCKWHEAT	native	
Eriogonum glandulosum (Nutt.) Nutt. ex Benth.	POLYGONACEAE	GLANDULAR WILD BUCKWHEAT	native	
Eriogonum gossypinum Curran	POLYGONACEAE	COTTONY BUCKWHEAT	native	
Eriogonum gracile Benth.	POLYGONACEAE		native	
Eriogonum gracile Benth. var. gracile	POLYGONACEAE	SLENDER WOOLLY WILD BUCKWHEAT	native	
Eriogonum gracile Benth. var. incultum Reveal	POLYGONACEAE	PALOMAR MOUNTAIN WILD BUCKWHEAT	native	
Eriogonum gracilipes S. Watson	POLYGONACEAE	WHITE MOUNTAINS WILD BUCKWHEAT	native	
Eriogonum gracillimum S. Watson	POLYGONACEAE	ROSE-AND-WHITE WILD BUCKWHEAT	native	
Eriogonum grande Greene	POLYGONACEAE		native	
Eriogonum grande Greene var. grande	POLYGONACEAE	ISLAND BUCKWHEAT	native	
Eriogonum grande Greene var. rubescens (Greene) Munz	POLYGONACEAE	RED-FLOWERED BUCKWHEAT	native	
Eriogonum grande Greene var. timorum Reveal	POLYGONACEAE	SAN NICOLAS ISLAND BUCKWHEAT	native	
Eriogonum heermannii Durand & Hilg.	POLYGONACEAE		native	
Eriogonum heermannii Durand & Hilg. var. argense (M. E. Jones) Munz	POLYGONACEAE	HEERMANN'S ROUGH WILD BUCKWHEAT	native	
Eriogonum heermannii Durand & Hilg. var. floccosum Munz	POLYGONACEAE	CLARK MOUNTAIN BUCKWHEAT	native	
Eriogonum heermannii Durand & Hilg. var. heermannii	POLYGONACEAE	HEERMANN'S WILD BUCKWHEAT	native	
Eriogonum heermannii Durand & Hilg. var. humilius (S. Stokes) Reveal	POLYGONACEAE	HEERMANN'S GREAT BASIN WILD BUCKWHEAT	native	
Eriogonum heermannii Durand & Hilg. var. occidentale S. Stokes	POLYGONACEAE	WESTERN HEERMANN'S BUCKWHEAT	native	
Eriogonum heermannii Durand & Hilg. var. sulcatum (S. Watson) Munz & Reveal	POLYGONACEAE	HEERMANN'S GROOVED WILD BUCKWHEAT	native	
Eriogonum heracleoides Nutt.	POLYGONACEAE		native	
Eriogonum heracleoides Nutt. var. heracleoides	POLYGONACEAE	PARSNIP-FLOWERED BUCKWHEAT	native	
Eriogonum hirtellum J. T. Howell & Bacig.	POLYGONACEAE	KLAMATH MOUNTAIN BUCKWHEAT	native	
Eriogonum hirtiflorum A. Gray ex S. Watson	POLYGONACEAE	HAIRY-FLOWER WILD BUCKWHEAT	native	
Eriogonum hoffmannii S. Stokes	POLYGONACEAE		native	
Eriogonum hoffmannii S. Stokes var. hoffmannii	POLYGONACEAE	HOFFMANN'S BUCKWHEAT	native	
Eriogonum hoffmannii S. Stokes var. robustius S. Stokes	POLYGONACEAE	ROBUST HOFFMANN'S BUCKWHEAT	native	
Eriogonum hookeri S. Watson	POLYGONACEAE	HOOKER'S WILD BUCKWHEAT	native	
Eriogonum incanum Torr. & A. Gray	POLYGONACEAE	FROSTED WILD BUCKWHEAT	native	
Eriogonum inerme (S. Watson) Jeps.	POLYGONACEAE		native	
Eriogonum inerme (S. Watson) Jeps. var. hispidulum Goodman	POLYGONACEAE	GOODMAN'S UNARMED WILD BUCKWHEAT	native	
Eriogonum inerme (S. Watson) Jeps. var. inerme	POLYGONACEAE	UNARMED WILD BUCKWHEAT	native	
Eriogonum inflatum Torr. & Frém.	POLYGONACEAE	DESERT TRUMPET	native	
Eriogonum intrafractum Coville & C. V. Morton	POLYGONACEAE	JOINTED BUCKWHEAT	native	
Eriogonum kelloggii A. Gray	POLYGONACEAE	KELLOGG'S BUCKWHEAT	native	
Eriogonum kennedyi Porter ex S. Watson	POLYGONACEAE		native	
Eriogonum kennedyi Porter ex S. Watson var. alpigenum (Munz & I. M. Johnst.) Munz & I. M. Johnst.	POLYGONACEAE	SOUTHERN ALPINE BUCKWHEAT	native	
Eriogonum kennedyi Porter ex S. Watson var. austromontanum Munz & I. M. Johnst.	POLYGONACEAE	SOUTHERN MOUNTAIN BUCKWHEAT	native	
Eriogonum kennedyi Porter ex S. Watson var. kennedyi	POLYGONACEAE	KENNEDY'S WILD BUCKWHEAT	native	
Eriogonum kennedyi Porter ex S. Watson var. pinicola Reveal	POLYGONACEAE	KERN BUCKWHEAT	native	
Eriogonum kennedyi Porter ex S. Watson var. purpusii (Brandegee) Reveal	POLYGONACEAE	PURPUS' WILD BUCKWHEAT	native	
Eriogonum latens Jeps.	POLYGONACEAE	INYO WILD BUCKWHEAT	native	
Eriogonum latifolium Sm.	POLYGONACEAE	SEASIDE WILD BUCKWHEAT	native	
Eriogonum libertini Reveal	POLYGONACEAE	DUBAKELLA MOUNTAIN BUCKWHEAT	native	
Eriogonum lobbii Torr. & A. Gray	POLYGONACEAE	LOBB'S WILD BUCKWHEAT	native	
Eriogonum luteolum Greene	POLYGONACEAE		native	
Eriogonum luteolum Greene var. caninum (Greene) Reveal	POLYGONACEAE	TIBURON BUCKWHEAT	native	
Eriogonum luteolum Greene var. luteolum	POLYGONACEAE	GOLDEN-CARPET WILD BUCKWHEAT	native	
Eriogonum luteolum Greene var. pedunculatum (S. Stokes) Reveal	POLYGONACEAE	MOKELUMNE HILL WILD BUCKWHEAT	native	
Eriogonum luteolum Greene var. saltuarium Reveal	POLYGONACEAE	JACK'S WILD BUCKWHEAT	native	
Eriogonum maculatum A. Heller	POLYGONACEAE	SPOTTED WILD BUCKWHEAT	native	
Eriogonum marifolium Torr. & A. Gray	POLYGONACEAE		native	
Eriogonum marifolium Torr. & A. Gray var. cupulatum (S. Stokes) Reveal	POLYGONACEAE	MCCLOUD WILD BUCKWHEAT	native	
Eriogonum marifolium Torr. & A. Gray var. marifolium	POLYGONACEAE	MARUM-LEAF WILD BUCKWHEAT	native	
Eriogonum mensicola S. Stokes	POLYGONACEAE	PINYON MESA BUCKWHEAT	native	
Eriogonum microthecum Nutt.	POLYGONACEAE		native	
Eriogonum microthecum Nutt. var. alpinum Reveal	POLYGONACEAE	NORTHERN LIMESTONE BUCKWHEAT	native	
Eriogonum microthecum Nutt. var. ambiguum (M. E. Jones) Reveal	POLYGONACEAE	YELLOW-FLOWERED WILD BUCKWHEAT	native	
Eriogonum microthecum Nutt. var. corymbosoides Reveal	POLYGONACEAE	SAN BERNARDINO WILD BUCKWHEAT	native	
Eriogonum microthecum Nutt. var. johnstonii Reveal	POLYGONACEAE	JOHNSTON'S BUCKWHEAT	native	
Eriogonum microthecum Nutt. var. lacus-ursi Reveal & A. Sanders	POLYGONACEAE	BEAR LAKE BUCKWHEAT	native	
Eriogonum microthecum Nutt. var. lapidicola Reveal	POLYGONACEAE	INYO MOUNTAINS BUCKWHEAT	native	
Eriogonum microthecum Nutt. var. laxiflorum Hook.	POLYGONACEAE	GREAT BASIN WILD BUCKWHEAT	native	
Eriogonum microthecum Nutt. var. panamintense S. Stokes	POLYGONACEAE	PANAMINT MOUNTAINS BUCKWHEAT	native	
Eriogonum microthecum Nutt. var. schoolcraftii Reveal	POLYGONACEAE	SCHOOLCRAFT'S WILD BUCKWHEAT	native	
Eriogonum microthecum Nutt. var. simpsonii (Benth.) Reveal	POLYGONACEAE	SIMPSON'S WILD BUCKWHEAT	native	
Eriogonum mohavense S. Watson	POLYGONACEAE	WESTERN MOJAVE WILD BUCKWHEAT	native	
Eriogonum molestum S. Watson	POLYGONACEAE	PINELAND WILD BUCKWHEAT	native	
Eriogonum nervulosum (S. Stokes) Reveal	POLYGONACEAE	SNOW MOUNTAIN BUCKWHEAT	native	
Eriogonum nidularium Coville	POLYGONACEAE	BIRDNEST WILD BUCKWHEAT	native	
Eriogonum nortonii Greene	POLYGONACEAE	PINNACLES BUCKWHEAT	native	
Eriogonum nudum Douglas ex Benth.	POLYGONACEAE		native	
Eriogonum nudum Douglas ex Benth. var. auriculatum (Benth.) J. P. Tracy ex Jeps.	POLYGONACEAE	EAR-SHAPED WILD BUCKWHEAT	native	
Eriogonum nudum Douglas ex Benth. var. decurrens (S. Stokes) M. L. Bowerman	POLYGONACEAE	BEN LOMOND BUCKWHEAT	native	
Eriogonum nudum Douglas ex Benth. var. deductum (Greene) Jeps.	POLYGONACEAE	REDUCED WILD BUCKWHEAT	native	
Eriogonum nudum Douglas ex Benth. var. indictum (Jeps.) Reveal	POLYGONACEAE	PROTRUDING BUCKWHEAT	native	
Eriogonum nudum Douglas ex Benth. var. murinum Reveal	POLYGONACEAE	MOUSE BUCKWHEAT	native	
Eriogonum nudum Douglas ex Benth. var. nudum	POLYGONACEAE	NAKED WILD BUCKWHEAT	native	
Eriogonum nudum Douglas ex Benth. var. oblongifolium S. Watson	POLYGONACEAE	HARFORD'S WILD BUCKWHEAT	native	
Eriogonum nudum Douglas ex Benth. var. paralinum Reveal	POLYGONACEAE	DEL NORTE BUCKWHEAT	native	
Eriogonum nudum Douglas ex Benth. var. pauciflorum S. Watson	POLYGONACEAE	LITTLE-FLOWER WILD BUCKWHEAT	native	
Eriogonum nudum Douglas ex Benth. var. psychicola Reveal [see Correspondence 3]	POLYGONACEAE	ANTIOCH DUNES BUCKWHEAT	native	
Eriogonum nudum Douglas ex Benth. var. pubiflorum Benth.	POLYGONACEAE	FREMONT'S WILD BUCKWHEAT	native	
Eriogonum nudum Douglas ex Benth. var. regirivum Reveal & J. C. Stebbins	POLYGONACEAE	KINGS RIVER BUCKWHEAT	native	
Eriogonum nudum Douglas ex Benth. var. scapigerum (Eastw.) Jeps.	POLYGONACEAE	SIERRAN CREST WILD BUCKWHEAT	native	
Eriogonum nudum Douglas ex Benth. var. westonii (S. Stokes) J. T. Howell	POLYGONACEAE	WESTON'S WILD BUCKWHEAT	native	
Eriogonum nummulare M. E. Jones	POLYGONACEAE	MONEY WILD BUCKWHEAT	native	
Eriogonum nutans Torr. & A. Gray	POLYGONACEAE		native	
Eriogonum nutans Torr. & A. Gray var. nutans	POLYGONACEAE	DUGWAY WILD BUCKWHEAT	native	
Eriogonum ochrocephalum S. Watson	POLYGONACEAE		native	
Eriogonum ochrocephalum S. Watson var. ochrocephalum	POLYGONACEAE	OCHRE-FLOWERED BUCKWHEAT	native	
Eriogonum ordii S. Watson	POLYGONACEAE	FORT MOHAVE WILD BUCKWHEAT	native	
Eriogonum ovalifolium Nutt.	POLYGONACEAE		native	
Eriogonum ovalifolium Nutt. var. caelestinum Reveal	POLYGONACEAE	HEAVENLY WILD BUCKWHEAT	native	
Eriogonum ovalifolium Nutt. var. depressum Blank.	POLYGONACEAE	DEPRESSED WILD BUCKWHEAT	native	
Eriogonum ovalifolium Nutt. var. eximium (Tidestr.) J. T. Howell	POLYGONACEAE	BROWN-MARGINED BUCKWHEAT	native	
Eriogonum ovalifolium Nutt. var. monarchense D. A. York	POLYGONACEAE	MONARCH BUCKWHEAT	native	
Eriogonum ovalifolium Nutt. var. nivale (Canby ex Coville) M. E. Jones	POLYGONACEAE	SIERRAN CUSHION WILD BUCKWHEAT	native	
Eriogonum ovalifolium Nutt. var. ovalifolium	POLYGONACEAE	CUSHION WILD BUCKWHEAT	native	
Eriogonum ovalifolium Nutt. var. purpureum (Nutt.) Durand	POLYGONACEAE	PURPLE CUSHION WILD BUCKWHEAT	native	
Eriogonum ovalifolium Nutt. var. vineum (Small) A. Nelson	POLYGONACEAE	CUSHENBURY BUCKWHEAT	native	
Eriogonum palmerianum Reveal	POLYGONACEAE	PALMER'S WILD BUCKWHEAT	native	
Eriogonum panamintense C. V. Morton	POLYGONACEAE	PANAMINT MOUNTAIN WILD BUCKWHEAT	native	
Eriogonum parishii S. Watson	POLYGONACEAE	PARISH'S WILD BUCKWHEAT	native	
Eriogonum parvifolium Sm.	POLYGONACEAE	SEACLIFF WILD BUCKWHEAT	native	
Eriogonum pendulum S. Watson	POLYGONACEAE	WALDO WILD BUCKWHEAT	native	
Eriogonum plumatella Durand & Hilg.	POLYGONACEAE	YUCCA WILD BUCKWHEAT	native	
Eriogonum polypodum Small	POLYGONACEAE	TULARE COUNTY BUCKWHEAT	native	
Eriogonum prattenianum Durand	POLYGONACEAE		native	
Eriogonum prattenianum Durand var. avium Reveal & Shevock	POLYGONACEAE	KETTLE DOME BUCKWHEAT	native	
Eriogonum prattenianum Durand var. prattenianum	POLYGONACEAE	PROSTRATE BUCKWHEAT	native	
Eriogonum prociduum Reveal	POLYGONACEAE		native	
Eriogonum pusillum Torr. & A. Gray	POLYGONACEAE	YELLOW TURBANS	native	
Eriogonum pyrolifolium Hook.	POLYGONACEAE		native	
Eriogonum pyrolifolium Hook. var. coryphaeum Torr. & A. Gray	POLYGONACEAE	HAIRY SHASTA WILD BUCKWHEAT	native	
Eriogonum pyrolifolium Hook. var. pyrolifolium	POLYGONACEAE	PYROLA-LEAVED BUCKWHEAT	native	
Eriogonum reniforme Torr. & Frém.	POLYGONACEAE	KIDNEY-LEAF WILD BUCKWHEAT	native	
Eriogonum rixfordii S. Stokes	POLYGONACEAE	PAGODA WILD BUCKWHEAT	native	
Eriogonum rosense A. Nelson & P. B. Kenn.	POLYGONACEAE		native	
Eriogonum rosense A. Nelson & P. B. Kenn. var. rosense	POLYGONACEAE	MOUNT ROSE WILD BUCKWHEAT	native	
Eriogonum roseum Durand & Hilg.	POLYGONACEAE	WAND WILD BUCKWHEAT	native	
Eriogonum rupinum Reveal	POLYGONACEAE	WYMAN CREEK WILD BUCKWHEAT	native	
Eriogonum saxatile S. Watson	POLYGONACEAE	HOARY WILD BUCKWHEAT	native	
Eriogonum shockleyi S. Watson	POLYGONACEAE		native	
Eriogonum shockleyi S. Watson var. shockleyi	POLYGONACEAE	SHOCKLEY'S BUCKWHEAT	native	
Eriogonum siskiyouense Small	POLYGONACEAE	SISKIYOU BUCKWHEAT	native	
Eriogonum spectabile B. L. Corbin, Reveal, & R. Barron	POLYGONACEAE	BARRON'S BUCKWHEAT	native	
Eriogonum spergulinum A. Gray	POLYGONACEAE		native	
Eriogonum spergulinum A. Gray var. pratense (S. Stokes) J. T. Howell	POLYGONACEAE	MOUNTAIN MEADOW WILD BUCKWHEAT	native	
Eriogonum spergulinum A. Gray var. reddingianum (M. E. Jones) J. T. Howell	POLYGONACEAE	REDDING'S WILD BUCKWHEAT	native	
Eriogonum spergulinum A. Gray var. spergulinum	POLYGONACEAE	SPURRY WILD BUCKWHEAT	native	
Eriogonum sphaerocephalum Douglas ex Benth.	POLYGONACEAE		native	
Eriogonum sphaerocephalum Douglas ex Benth. var. halimioides (Gand.) S. Stokes	POLYGONACEAE	HALIMIUM WILD BUCKWHEAT	native	
Eriogonum sphaerocephalum Douglas ex Benth. var. sphaerocephalum	POLYGONACEAE	ROCK WILD BUCKWHEAT	native	
Eriogonum strictum Benth.	POLYGONACEAE		native	
Eriogonum strictum Benth. var. anserinum (Greene) S. Stokes	POLYGONACEAE	GOOSE LAKE WILD BUCKWHEAT	native	
Eriogonum strictum Benth. var. greenei (A. Gray) Reveal	POLYGONACEAE	GREENE'S BUCKWHEAT	native	
Eriogonum strictum Benth. var. proliferum (Torr. & A. Gray) C. L. Hitchc.	POLYGONACEAE	PROLIFEROUS WILD BUCKWHEAT	native	
Eriogonum temblorense J. T. Howell & Twisselm.	POLYGONACEAE	TEMBLOR BUCKWHEAT	native	
Eriogonum ternatum Howell	POLYGONACEAE	TERNATE BUCKWHEAT	native	
Eriogonum thomasii Torr.	POLYGONACEAE	THOMAS' WILD BUCKWHEAT	native	
Eriogonum thornei (Reveal & Henr.) L. M. Shultz	POLYGONACEAE	THORNE'S BUCKWHEAT	native	
Eriogonum thurberi Torr.	POLYGONACEAE	THURBER'S WILD BUCKWHEAT	native	
Eriogonum trichopes Torr.	POLYGONACEAE	LITTLE DESERT TRUMPET	native	
Eriogonum tripodum Greene	POLYGONACEAE	TRIPOD BUCKWHEAT	native	
Eriogonum truncatum Torr. & A. Gray	POLYGONACEAE	MOUNT DIABLO BUCKWHEAT	native	
Eriogonum twisselmannii (J. T. Howell) Reveal	POLYGONACEAE	TWISSELMANN'S BUCKWHEAT	native	
Eriogonum umbellatum Torr.	POLYGONACEAE	SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. ahartii Reveal	POLYGONACEAE	AHART'S BUCKWHEAT	native	
Eriogonum umbellatum Torr. var. argus Reveal	POLYGONACEAE	ONE-EYED SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. bahiiforme (Torr. & A. Gray) Jeps.	POLYGONACEAE	BAY BUCKWHEAT	native	
Eriogonum umbellatum Torr. var. canifolium Reveal	POLYGONACEAE	SHERMAN PASS SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. chlorothamnus Reveal	POLYGONACEAE	SHERWIN GRADE SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. covillei (Small) Munz & Reveal	POLYGONACEAE	COVILLE'S SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. dichrocephalum Gand.	POLYGONACEAE	BICOLOR SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. dumosum (Greene) Reveal	POLYGONACEAE	AMERICAN VALLEY SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. furcosum Reveal	POLYGONACEAE	SIERRA NEVADA SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. glaberrimum (Gand.) Reveal	POLYGONACEAE	WARNER MOUNTAINS BUCKWHEAT	native	
Eriogonum umbellatum Torr. var. goodmanii Reveal	POLYGONACEAE	GOODMAN'S SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. humistratum Reveal	POLYGONACEAE	MOUNT EDDY BUCKWHEAT	native	
Eriogonum umbellatum Torr. var. juniporinum Reveal	POLYGONACEAE	JUNIPER SULPHUR-FLOWERED BUCKWHEAT	native	
Eriogonum umbellatum Torr. var. lautum Reveal	POLYGONACEAE	SCOTT VALLEY BUCKWHEAT	native	
Eriogonum umbellatum Torr. var. minus I. M. Johnst.	POLYGONACEAE	ALPINE SULPHUR-FLOWERED BUCKWHEAT	native	
Eriogonum umbellatum Torr. var. modocense (Greene) S. Stokes	POLYGONACEAE	MODOC SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. munzii Reveal	POLYGONACEAE	MUNZ'S SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. nelsoniorum Reveal	POLYGONACEAE	NELSONS' SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. nevadense Gand.	POLYGONACEAE	NEVADA SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. smallianum (A. Heller) S. Stokes	POLYGONACEAE	SMALL'S SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. speciosum (Drew) S. Stokes	POLYGONACEAE	BEAUTIFUL SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. subaridum S. Stokes	POLYGONACEAE	FERRIS' SULPHUR FLOWER	native	
Eriogonum umbellatum Torr. var. torreyanum (A. Gray) M. E. Jones	POLYGONACEAE	DONNER PASS BUCKWHEAT	native	
Eriogonum umbellatum Torr. var. versicolor S. Stokes	POLYGONACEAE	PANAMINT SULPHUR FLOWER	native	
Eriogonum ursinum S. Watson	POLYGONACEAE		native	
Eriogonum ursinum S. Watson var. erubescens Reveal & J. Knorr	POLYGONACEAE	BLUSHING WILD BUCKWHEAT	native	
Eriogonum ursinum S. Watson var. ursinum	POLYGONACEAE	BEAR VALLEY WILD BUCKWHEAT	native	
Eriogonum vestitum J. T. Howell	POLYGONACEAE	IDRIA BUCKWHEAT	native	
Eriogonum vimineum Douglas ex Benth.	POLYGONACEAE	WICKER-STEM WILD BUCKWHEAT	native	
Eriogonum viridescens A. Heller	POLYGONACEAE	TWO-TOOTHED WILD BUCKWHEAT	native	
Eriogonum wrightii Torr. ex Benth.	POLYGONACEAE	BASTARD-SAGE	native	
Eriogonum wrightii Torr. ex Benth. var. membranaceum S. Stokes ex Jeps.	POLYGONACEAE	RINGED-STEM BASTARD-SAGE	native	
Eriogonum wrightii Torr. ex Benth. var. nodosum (Small) Reveal	POLYGONACEAE	KNOT-STEM BASTARD-SAGE	native	
Eriogonum wrightii Torr. ex Benth. var. olanchense (J. T. Howell) Reveal	POLYGONACEAE	OLANCHA PEAK BUCKWHEAT	native	
Eriogonum wrightii Torr. ex Benth. var. subscaposum S. Watson	POLYGONACEAE	SHORT-STEMMED BASTARD-SAGE	native	
Eriogonum wrightii Torr. ex Benth. var. trachygonum (Torr. ex Benth.) Jeps.	POLYGONACEAE	ROUGH-NODE BASTARD-SAGE	native	
Eriogonum wrightii Torr. ex Benth. var. wrightii	POLYGONACEAE	WRIGHT'S BASTARD-SAGE	native	
Erioneuron pilosum (Buckley) Nash	POACEAE	HAIRY ERIONEURON	native	
Eriophorum crinigerum (A. Gray) Beetle	CYPERACEAE		native	
Eriophorum gracile W. D. J. Koch ex Roth	CYPERACEAE	SLENDER COTTONGRASS	native	
Eriophyllum ambiguum (A. Gray) A. Gray	ASTERACEAE		native	
Eriophyllum ambiguum (A. Gray) A. Gray var. ambiguum	ASTERACEAE	BEAUTIFUL WOOLLY SUNFLOWER	native	
Eriophyllum ambiguum (A. Gray) A. Gray var. paleaceum (Brandegee) Ferris	ASTERACEAE		native	
Eriophyllum confertiflorum (DC.) A. Gray	ASTERACEAE	YELLOW-YARROW	native	
Eriophyllum confertiflorum (DC.) A. Gray var. confertiflorum	ASTERACEAE		native	
Eriophyllum confertiflorum (DC.) A. Gray var. tanacetiflorum (Greene) Jeps.	ASTERACEAE	TANSY-FLOWERED WOOLLY SUNFLOWER	native	
Eriophyllum congdonii Brandegee	ASTERACEAE	CONGDON'S WOOLLY SUNFLOWER	native	
Eriophyllum jepsonii Greene	ASTERACEAE	JEPSON'S WOOLLY SUNFLOWER	native	
Eriophyllum lanatum (Pursh) J. Forbes	ASTERACEAE	COMMON WOOLLY SUNFLOWER	native	
Eriophyllum lanatum (Pursh) J. Forbes var. achilleoides (DC.) Jeps.	ASTERACEAE		native	
Eriophyllum lanatum (Pursh) J. Forbes var. arachnoideum (Fisch. & Avé-Lall.) Jeps.	ASTERACEAE		native	
Eriophyllum lanatum (Pursh) J. Forbes var. croceum (Greene) Jeps.	ASTERACEAE		native	
Eriophyllum lanatum (Pursh) J. Forbes var. grandiflorum (A. Gray) Jeps.	ASTERACEAE		native	
Eriophyllum lanatum (Pursh) J. Forbes var. hallii Constance	ASTERACEAE	FORT TEJON WOOLLY SUNFLOWER	native	
Eriophyllum lanatum (Pursh) J. Forbes var. integrifolium (Hook.) Smiley	ASTERACEAE	OREGON SUNSHINE	native	
Eriophyllum lanatum (Pursh) J. Forbes var. lanceolatum (Howell) Jeps.	ASTERACEAE		native	
Eriophyllum lanatum (Pursh) J. Forbes var. obovatum (Greene) H. M. Hall	ASTERACEAE	SOUTHERN SIERRA WOOLLY SUNFLOWER	native	
Eriophyllum lanosum (A. Gray) A. Gray	ASTERACEAE		native	
Eriophyllum latilobum Rydb.	ASTERACEAE	SAN MATEO WOOLLY SUNFLOWER	native	
Eriophyllum mohavense (I. M. Johnst.) Jeps.	ASTERACEAE	BARSTOW WOOLLY SUNFLOWER	native	
Eriophyllum multicaule (DC.) A. Gray	ASTERACEAE	MANY-STEM WOOLLY SUNFLOWER	native	
Eriophyllum nubigenum Greene ex A. Gray	ASTERACEAE	YOSEMITE WOOLLY SUNFLOWER	native	
Eriophyllum pringlei A. Gray	ASTERACEAE	PRINGLE'S WOOLLY SUNFLOWER	native	
Eriophyllum staechadifolium Lag.	ASTERACEAE	SEASIDE WOOLLY SUNFLOWER	native	
Eriophyllum wallacei (A. Gray) A. Gray	ASTERACEAE	WALLACE'S WOOLLY DAISY	native	
Erodium botrys (Cav.) Bertol.	GERANIACEAE		naturalized	
Erodium brachycarpum (Godr.) Thell.	GERANIACEAE		naturalized	
Erodium cicutarium (L.) L'Hér. ex Aiton	GERANIACEAE	REDSTEM FILAREE	naturalized	
Erodium malacoides (L.) L'Hér. ex Aiton	GERANIACEAE		naturalized	
Erodium moschatum (L.) L'Hér. ex Aiton	GERANIACEAE	GREENSTEM FILAREE	naturalized	
Erodium texanum A. Gray	GERANIACEAE	TEXAS FILAREE	native	
Eruca vesicaria (L.) Cav.	BRASSICACEAE		naturalized	
Eruca vesicaria (L.) Cav. subsp. sativa (Mill.) Thell.	BRASSICACEAE		naturalized	
Eryngium alismifolium Greene	APIACEAE	ALISMA-LEAVED BUTTON-CELERY	native	
Eryngium aristulatum Jeps.	APIACEAE		native	
Eryngium aristulatum Jeps. var. aristulatum	APIACEAE		native	
Eryngium aristulatum Jeps. var. hooveri M. Y. Sheikh	APIACEAE	HOOVER'S BUTTON-CELERY	native	
Eryngium aristulatum Jeps. var. parishii (J. M. Coult. & Rose) Mathias & Constance	APIACEAE	SAN DIEGO BUTTON-CELERY	native	
Eryngium armatum (S. Watson) J. M. Coult. & Rose	APIACEAE	COASTAL BUTTON-CELERY	native	
Eryngium articulatum Hook.	APIACEAE	BEETHISTLE	native	
Eryngium castrense Jeps.	APIACEAE	GREAT VALLEY COYOTE-THISTLE	native	
Eryngium constancei M. Y. Sheikh	APIACEAE	LOCH LOMOND BUTTON-CELERY	native	
Eryngium jepsonii J. M. Coult. & Rose	APIACEAE		native	
Eryngium mathiasiae M. Y. Sheikh	APIACEAE	MATHIAS' BUTTON-CELERY	native	
Eryngium pendletonense K. L. Marsden & M. G. Simpson	APIACEAE	PENDLETON BUTTON-CELERY	native	
Eryngium pinnatisectum Jeps.	APIACEAE	TUOLUMNE BUTTON-CELERY	native	
Eryngium racemosum Jeps.	APIACEAE	DELTA BUTTON-CELERY	native	
Eryngium spinosepalum Mathias	APIACEAE	SPINY-SEPALED BUTTON-CELERY	native	
Eryngium vaseyi J. M. Coult. & Rose	APIACEAE	COYOTE-THISTLE	native	
Eryngium vaseyi var. vallicola (Jeps.) Munz	APIACEAE		native	
Eryngium vaseyi var. vaseyi	APIACEAE		native	
Erysimum ammophilum A. Heller	BRASSICACEAE	SAND-LOVING WALLFLOWER	native	
Erysimum capitatum (Hook.) Greene	BRASSICACEAE	WESTERN WALLFLOWER	native	
Erysimum capitatum (Hook.) Greene var. capitatum	BRASSICACEAE		native	
Erysimum capitatum (Hook.) Greene var. purshii (Durand) Rollins	BRASSICACEAE		native	
Erysimum cheiranthoides L.	BRASSICACEAE	WORMSEED MUSTARD	naturalized	
Erysimum cheiri (L.) Crantz	BRASSICACEAE		naturalized	
Erysimum concinnum Eastw.	BRASSICACEAE		native	
Erysimum franciscanum Rossbach	BRASSICACEAE	SAN FRANCISCO WALLFLOWER	native	
Erysimum insulare Greene	BRASSICACEAE	ISLAND WALLFLOWER	native	
Erysimum menziesii (Hook.) Wettst.	BRASSICACEAE	MENZIES' WALLFLOWER	native	
Erysimum perenne (Coville) Abrams	BRASSICACEAE		native	
Erysimum repandum L.	BRASSICACEAE		naturalized	
Erysimum suffrutescens (Abrams) Rossbach	BRASSICACEAE	SUFFRUTESCENT WALLFLOWER	native	
Erysimum teretifolium Eastw.	BRASSICACEAE	SANTA CRUZ WALLFLOWER	native	
Erythronium californicum Purdy	LILIACEAE		native	
Erythronium citrinum S. Watson	LILIACEAE		native	
Erythronium citrinum S. Watson var. citrinum	LILIACEAE	LEMON-COLORED FAWN LILY	native	
Erythronium citrinum S. Watson var. roderickii Shevock & G. A. Allen	LILIACEAE	SCOTT MOUNTAINS FAWN LILY	native	
Erythronium grandiflorum Pursh	LILIACEAE		native	
Erythronium helenae Applegate	LILIACEAE	ST. HELENA FAWN LILY	native	
Erythronium hendersonii S. Watson	LILIACEAE	HENDERSON'S FAWN LILY	native	
Erythronium klamathense Applegate	LILIACEAE	KLAMATH FAWN LILY	native	
Erythronium multiscapideum (Kellogg) A. Nelson & P. B. Kenn.	LILIACEAE		native	
Erythronium oregonum Applegate	LILIACEAE	GIANT FAWN LILY	native	
Erythronium pluriflorum Shevock, Bartel & G. A. Allen	LILIACEAE	SHUTEYE PEAK FAWN LILY	native	
Erythronium purpurascens S. Watson	LILIACEAE		native	
Erythronium pusaterii (Munz & J. T. Howell) Shevock, Bartel & G. A. Allen	LILIACEAE	KAWEAH FAWN LILY	native	
Erythronium revolutum Sm.	LILIACEAE	COAST FAWN LILY	native	
Erythronium taylorii Shevock & G. A. Allen	LILIACEAE	PILOT RIDGE FAWN LILY	native	
Erythronium tuolumnense Applegate	LILIACEAE	TUOLUMNE FAWN LILY	native	
Eschscholzia caespitosa Benth.	PAPAVERACEAE		native	
Eschscholzia californica Cham.	PAPAVERACEAE	CALIFORNIA POPPY	native	
Eschscholzia glyptosperma Greene	PAPAVERACEAE		native	
Eschscholzia hypecoides Benth.	PAPAVERACEAE	SAN BENITO POPPY	native	
Eschscholzia lemmonii Greene	PAPAVERACEAE		native	
Eschscholzia lemmonii Greene subsp. kernensis (Munz) C. Clark	PAPAVERACEAE	TEJON POPPY	native	
Eschscholzia lemmonii Greene subsp. lemmonii	PAPAVERACEAE		native	
Eschscholzia lobbii Greene	PAPAVERACEAE	FRYING PANS	native	
Eschscholzia minutiflora S. Watson	PAPAVERACEAE		native	
Eschscholzia parishii Greene	PAPAVERACEAE		native	
Eschscholzia ramosa (Greene) Greene	PAPAVERACEAE	ISLAND POPPY	native	
Eschscholzia rhombipetala Greene	PAPAVERACEAE	DIAMOND-PETALED CALIFORNIA POPPY	native	
Eucalyptus camaldulensis Dehnh.	MYRTACEAE	RIVER RED GUM	naturalized	
Eucalyptus citriodora Hook.	MYRTACEAE	LEMON-SCENTED GUM	naturalized	
Eucalyptus cladocalyx F. Muell.	MYRTACEAE	SUGAR GUM	naturalized	
Eucalyptus conferruminata D. J. Carr & S. G. M. Carr	MYRTACEAE	BUSHY YATE	naturalized	
Eucalyptus globulus Labill.	MYRTACEAE	BLUE GUM	naturalized	
Eucalyptus polyanthemos Schauer	MYRTACEAE	RED BOX	naturalized	
Eucalyptus pulchella Desf.	MYRTACEAE	WHITE PEPPERMINT	naturalized	
Eucalyptus sideroxylon A. Cunn. ex Woolls	MYRTACEAE	RED IRON BARK	naturalized	
Eucalyptus tereticornis Sm.	MYRTACEAE	FOREST RED GUM	naturalized	
Eucalyptus viminalis Labill.	MYRTACEAE	RIBBON GUM	naturalized	
Eucephalus breweri (A. Gray) G. L. Nesom	ASTERACEAE		native	
Eucephalus engelmannii (D. C. Eaton) Greene	ASTERACEAE		native	
Eucephalus glabratus (Greene) Greene	ASTERACEAE	SISKIYOU ASTER	native	
Eucephalus ledophyllus (A. Gray) Greene	ASTERACEAE		native	
Eucephalus ledophyllus (A. Gray) Greene var. covillei (Greene) G.L. Nesom	ASTERACEAE		native	
Eucephalus tomentellus (Greene) Greene	ASTERACEAE	BRICKELLBUSH ASTER	native	
Eucephalus vialis Bradshaw	ASTERACEAE	WAYSIDE ASTER	native	
Euchiton gymnocephalus (DC.) Holub	ASTERACEAE	CREEPING CUDWEED	naturalized	
Euchiton involucratus (G. Forst.) Holub	ASTERACEAE	STAR COTTONLEAF	naturalized	
Euchiton sphaericus (Willd.) Holub	ASTERACEAE	GLOBE COTTONLEAF	naturalized	
Euclidium syriacum (L.) W. T. Aiton	BRASSICACEAE		naturalized	
Eucnide rupestris (Baill.) H. J. Thomps. & W. R. Ernst	LOASACEAE	ANNUAL ROCK-NETTLE	native	
Eucnide urens (A. Gray) Parry	LOASACEAE		native	
Eucrypta chrysanthemifolia (Benth.) Greene	BORAGINACEAE		native	
Eucrypta chrysanthemifolia (Benth.) Greene var. bipinnatifida (Torr.) Constance	BORAGINACEAE		native	
Eucrypta chrysanthemifolia (Benth.) Greene var. chrysanthemifolia	BORAGINACEAE		native	
Eucrypta micrantha (Torr.) A. Heller	BORAGINACEAE		native	
Eulobus californicus Torr. & A. Gray	ONAGRACEAE		native	
Euonymus occidentalis Nutt. ex Torr.	CELASTRACEAE	WESTERN BURNING BUSH	native	
Euonymus occidentalis Nutt. ex Torr. var. occidentalis	CELASTRACEAE		native	
Euonymus occidentalis Nutt. ex Torr. var. parishii (Trel.) Jeps.	CELASTRACEAE		native	
Euphorbia abramsiana L. C. Wheeler	EUPHORBIACEAE		native	
Euphorbia albomarginata Torr. & A. Gray	EUPHORBIACEAE		native	
Euphorbia arizonica Engelm.	EUPHORBIACEAE		native	
Euphorbia crenulata Engelm.	EUPHORBIACEAE	CHINESE CAPS	native	
Euphorbia dendroides L.	EUPHORBIACEAE		naturalized	
Euphorbia eriantha Benth.	EUPHORBIACEAE	BEETLE SPURGE	native	
Euphorbia exigua L.	EUPHORBIACEAE		naturalized	acceptance uncertain
Euphorbia exstipulata Engelm.	EUPHORBIACEAE		native	
Euphorbia exstipulata Engelm. var. exstipulata	EUPHORBIACEAE	CLARK MOUNTAIN SPURGE	native	
Euphorbia fendleri Torr. & A. Gray	EUPHORBIACEAE		native	
Euphorbia glyptosperma Engelm.	EUPHORBIACEAE		native	
Euphorbia helioscopia L.	EUPHORBIACEAE	WARTWEED	naturalized	
Euphorbia hooveri L. C. Wheeler	EUPHORBIACEAE		native	
Euphorbia jaegeri V.W. Steinm. & J. André	EUPHORBIACEAE		native	
Euphorbia lathyris L.	EUPHORBIACEAE	CAPER SPURGE	naturalized	
Euphorbia lurida Englem.	EUPHORBIACEAE		native	
Euphorbia maculata L.	EUPHORBIACEAE		naturalized	
Euphorbia melanadenia Torr.	EUPHORBIACEAE		native	
Euphorbia micromera Boiss.	EUPHORBIACEAE		native	
Euphorbia misera Benth.	EUPHORBIACEAE	CLIFF SPURGE	native	
Euphorbia nutans Lag.	EUPHORBIACEAE		naturalized	
Euphorbia oblongata Griseb.	EUPHORBIACEAE		naturalized	
Euphorbia ocellata Durand & Hilg.	EUPHORBIACEAE		native	
Euphorbia ocellata Durand & Hilg. subsp. arenicola (Parish) Oudejans	EUPHORBIACEAE		native	
Euphorbia ocellata Durand & Hilg. subsp. ocellata	EUPHORBIACEAE		native	
Euphorbia ocellata Durand & Hilg. subsp. rattanii (S. Watson) Oudejans	EUPHORBIACEAE		native	
Euphorbia parishii Greene	EUPHORBIACEAE		native	
Euphorbia parryi Engelm.	EUPHORBIACEAE		native	
Euphorbia pediculifera Engelm.	EUPHORBIACEAE		native	
Euphorbia peplus L.	EUPHORBIACEAE	PETTY SPURGE	naturalized	
Euphorbia platysperma Engelm.	EUPHORBIACEAE		native	
Euphorbia polycarpa Benth.	EUPHORBIACEAE		native	
Euphorbia prostrata Aiton	EUPHORBIACEAE		naturalized	
Euphorbia revoluta Engelm.	EUPHORBIACEAE		native	
Euphorbia schizoloba Engelm. in A. Gray	EUPHORBIACEAE	MOJAVE SPURGE	native	
Euphorbia serpens Kunth	EUPHORBIACEAE		naturalized	
Euphorbia serpyllifolia Pers.	EUPHORBIACEAE		native	
Euphorbia serpyllifolia Pers. subsp. hirtula (S. Watson) Oudejans	EUPHORBIACEAE		native	
Euphorbia serpyllifolia Pers. subsp. serpyllifolia	EUPHORBIACEAE		native	
Euphorbia setiloba Engelm.	EUPHORBIACEAE		native	
Euphorbia spathulata Lam.	EUPHORBIACEAE		native	
Euphorbia terracina L.	EUPHORBIACEAE	GERALDTON CARNATION WEED	naturalized	
Euphorbia vallis-mortae (Millsp.) J.T. Howell	EUPHORBIACEAE		native	
Euphorbia virgata Waldst. & Kit.	EUPHORBIACEAE	LEAFY SPURGE	naturalized	
Euphrosyne acerosa (Nutt.) Panero	ASTERACEAE	COPPERWORT	native	
Euphrosyne nevadensis (M.E. Jones) Panero	ASTERACEAE	NEVADA WORMWOOD	native	
Eurybia integrifolia (Nutt.) G. L. Nesom	ASTERACEAE		native	
Eurybia merita (A. Nelson) G. L. Nesom	ASTERACEAE	SUBALPINE ASTER	native	
Eurybia radulina (A. Gray) G. L. Nesom	ASTERACEAE		native	
Eustoma exaltatum (L.) Salisb. ex G. Don	GENTIANACEAE		native	
Eustoma exaltatum (L.) Salisb. ex G. Don subsp. exaltatum	GENTIANACEAE		native	
Euthamia occidentalis Nutt.	ASTERACEAE	WESTERN GOLDENROD	native	
Extriplex californica (Moq.) E.H. Zacharias	CHENOPODIACEAE		native	
Extriplex joaquinana (A. Nelson) E.H. Zacharias	CHENOPODIACEAE		native	
Fagonia laevis Standl.	ZYGOPHYLLACEAE		native	
Fagonia pachyacantha Rydb.	ZYGOPHYLLACEAE		native	
Fallopia baldschuanica (Regel) Holub	POLYGONACEAE	BUKHARA FLEECEFLOWER	naturalized	
Fallopia convolvulus (L.) A. Löve	POLYGONACEAE	BLACK BINDWEED	naturalized	
Fallopia japonica (Houtt.) Ronse Decr.	POLYGONACEAE	JAPANESE KNOTWEED	naturalized	
Fallopia sachalinensis (F. Schmidt Petrop.) Ronse Decr.	POLYGONACEAE	GIANT KNOTWEED	naturalized	
Fallugia paradoxa (D. Don) Endl. ex Torr.	ROSACEAE		native	
Fendlerella utahensis (S. Watson) A. Heller	HYDRANGEACEAE	YERBA DESIERTO	native	
Ferocactus cylindraceus (Engelm.) Orcutt	CACTACEAE	CALIFORNIA BARREL CACTUS	native	
Ferocactus viridescens (Torr. & A. Gray) Britton & Rose	CACTACEAE	SAN DIEGO BARREL CACTUS	native	
Festuca arundinacea Schreb.	POACEAE	TALL FESCUE	naturalized	
Festuca brachyphylla Schult. & Schult. f.	POACEAE		native	
Festuca brachyphylla Schult. & Schult. f. subsp. breviculmis Fred.	POACEAE	ALPINE FESCUE	native	
Festuca bromoides L.	POACEAE	BROME FESCUE	naturalized	
Festuca californica Vasey	POACEAE	CALIFORNIA FESCUE	native	
Festuca elmeri Scribn. & Merr.	POACEAE		native	
Festuca idahoensis Elmer	POACEAE	BLUE BUNCHGRASS	native	
Festuca kingii (S. Watson) Cassidy	POACEAE		native	
Festuca microstachys Nutt.	POACEAE		native	
Festuca minutiflora Rydb.	POACEAE	SMALL-FLOWERED FESCUE	native	
Festuca myuros L.	POACEAE	RATTAIL SIXWEEKS GRASS	naturalized	
Festuca occidentalis Hook.	POACEAE	WESTERN FESCUE	native	
Festuca octoflora Walter	POACEAE	SIXWEEKS GRASS	native	
Festuca perennis (L.) Columbus & J.P. Sm.	POACEAE	RYE GRASS	naturalized	
Festuca pratensis Huds.	POACEAE	MEADOW FESCUE	naturalized	
Festuca rubra L.	POACEAE	RED FESCUE	native	
Festuca saximontana Rydb.	POACEAE	MOUNTAIN FESCUE	native	
Festuca subulata Trin.	POACEAE	BEARDED FESCUE	native	
Festuca subuliflora Scribn.	POACEAE	CRINKLE-AWN FESCUE	native	
Festuca temulenta (L.) Columbus & J.P. Sm.	POACEAE	TARES	naturalized	
Festuca trachyphylla (Hack.) Krajina	POACEAE	SHEEP FESCUE	naturalized	
Festuca viridula Vasey	POACEAE	GREEN FESCUE	native	
Ficus carica L.	MORACEAE	EDIBLE FIG	naturalized	
Filago pyramidata L.	ASTERACEAE		naturalized	
Filago pyramidata L. var. pyramidata	ASTERACEAE	BROADLEAF COTTONROSE	naturalized	
Fimbristylis autumnalis (L.) Roem. & Schult.	CYPERACEAE		naturalized	
Fimbristylis thermalis S. Watson	CYPERACEAE	HOT SPRINGS FIMBRISTYLIS	native	
Fimbristylis vahlii (Lam.) Link	CYPERACEAE		native	
Flaveria trinervia (Spreng.) C. Mohr	ASTERACEAE		naturalized	
Floerkea proserpinacoides Willd.	LIMNANTHACEAE		native	
Foeniculum vulgare Mill.	APIACEAE	FENNEL	naturalized	
Forestiera pubescens Nutt.	OLEACEAE	DESERT OLIVE	native	
Fouquieria splendens Engelm.	FOUQUIERIACEAE		native	
Fouquieria splendens Engelm. subsp. splendens	FOUQUIERIACEAE	OCOTILLO	native	
Fragaria chiloensis (L.) Mill.	ROSACEAE	BEACH STRAWBERRY	native	
Fragaria vesca L.	ROSACEAE	WOOD STRAWBERRY	native	
Fragaria virginiana Mill.	ROSACEAE	MOUNTAIN STRAWBERRY	native	
Frangula californica (Eschsch.) A. Gray	RHAMNACEAE	CALIFORNIA COFFEE BERRY	native	
Frangula californica (Eschsch.) A. Gray subsp. californica	RHAMNACEAE		native	
Frangula californica (Eschsch.) A. Gray subsp. crassifolia (Jeps.) Kartesz & Gandhi	RHAMNACEAE		native	
Frangula californica (Eschsch.) A. Gray subsp. cuspidata (Greene) Kartesz & Gandhi	RHAMNACEAE		native	
Frangula californica (Eschsch.) A. Gray subsp. occidentalis (Howell ex Greene) Kartesz & Gandhi	RHAMNACEAE		native	
Frangula californica (Eschsch.) A. Gray subsp. tomentella (Benth.) Kartesz & Gandhi	RHAMNACEAE		native	
Frangula californica (Eschsch.) A. Gray subsp. ursina (Greene) Kartesz & Gandhi	RHAMNACEAE		native	
Frangula purshiana (DC.) J. G. Cooper	RHAMNACEAE	CASCARA	native	
Frangula purshiana (DC.) J. G. Cooper subsp. annonifolia (Greene) Sawyer & S.W. Edwards	RHAMNACEAE		native	
Frangula purshiana (DC.) J. G. Cooper subsp. purshiana	RHAMNACEAE		native	
Frangula purshiana Cooper subsp. ultramafica Sawyer & S. W. Edwards	RHAMNACEAE	CARIBOU COFFEEBERRY	native	
Frangula rubra (Greene) Grubov	RHAMNACEAE	SIERRA COFFEE BERRY	native	
Frangula rubra (Greene) Grubov subsp. modocensis (C. B. Wolf) Kartesz & Gandhi	RHAMNACEAE		native	
Frangula rubra (Greene) Grubov subsp. obtusissima (Greene) Kartesz & Gandhi	RHAMNACEAE		native	
Frangula rubra (Greene) Grubov subsp. rubra	RHAMNACEAE		native	
Frangula rubra (Greene) Grubov subsp. yosemitana (C. B. Wolf) Kartesz & Gandhi	RHAMNACEAE		native	
Frankenia palmeri S. Watson	FRANKENIACEAE	PALMER'S FRANKENIA	native	
Frankenia salina (Molina) I. M. Johnst.	FRANKENIACEAE	ALKALI HEATH	native	
Frasera albicaulis Griseb.	GENTIANACEAE		native	
Frasera albicaulis Griseb. var. modocensis (H. St. John) N. H. Holmgren	GENTIANACEAE		native	
Frasera albicaulis Griseb. var. nitida (Benth.) C. L. Hitchc.	GENTIANACEAE		native	
Frasera albomarginata S. Watson	GENTIANACEAE		native	
Frasera albomarginata S. Watson var. albomarginata	GENTIANACEAE	DESERT GREEN-GENTIAN	native	
Frasera albomarginata S. Watson var. induta (Tidestr.) Card	GENTIANACEAE	CLARK MOUNTAIN GREEN-GENTIAN	native	
Frasera neglecta H. M. Hall	GENTIANACEAE	PINE GREEN-GENTIAN	native	
Frasera parryi Torr.	GENTIANACEAE		native	
Frasera puberulenta Davidson	GENTIANACEAE		native	
Frasera speciosa Griseb.	GENTIANACEAE	MONUMENT PLANT	native	
Frasera tubulosa Coville	GENTIANACEAE		native	
Frasera umpquaensis M. Peck & Applegate	GENTIANACEAE	UMPQUA GREEN-GENTIAN	native	
Fraxinus anomala S. Watson	OLEACEAE	SINGLE-LEAF ASH	native	
Fraxinus dipetala Hook. & Arn.	OLEACEAE	CALIFORNIA ASH	native	
Fraxinus jonesii Lingelsh.	OLEACEAE		native	acceptance uncertain
Fraxinus latifolia Benth.	OLEACEAE	OREGON ASH	native	
Fraxinus parryi Moran	OLEACEAE	CHAPARRAL ASH	native	
Fraxinus velutina Torr.	OLEACEAE	VELVET ASH	native	
Fremontodendron californicum (Torr.) Coville	MALVACEAE		native	
Fremontodendron decumbens R. M. Lloyd	MALVACEAE	PINE HILL FLANNELBUSH	native	
Fremontodendron mexicanum Davidson	MALVACEAE	MEXICAN FLANNELBUSH	native	
Fritillaria affinis (Schult. & Schult. f.) Sealy	LILIACEAE	CHECKER LILY	native	
Fritillaria agrestis Greene	LILIACEAE	STINKBELLS	native	
Fritillaria atropurpurea Nutt.	LILIACEAE		native	
Fritillaria biflora Lindl.	LILIACEAE	MISSION BELLS	native	
Fritillaria biflora Lindl. var. biflora	LILIACEAE		native	
Fritillaria biflora Lindl. var. ineziana Jeps.	LILIACEAE	HILLSBOROUGH CHOCOLATE LILY	native	
Fritillaria brandegeei Eastw.	LILIACEAE	GREENHORN FRITILLARY	native	
Fritillaria eastwoodiae R. M. MacFarl.	LILIACEAE	BUTTE COUNTY FRITILLARY	native	
Fritillaria falcata (Jeps.) D. E. Beetle	LILIACEAE	TALUS FRITILLARY	native	
Fritillaria gentneri Gilkey	LILIACEAE	GENTNER'S FRITILLARY	native	
Fritillaria glauca Greene	LILIACEAE	SISKIYOU FRITILLARIA	native	
Fritillaria liliacea Lindl.	LILIACEAE	FRAGRANT FRITILLARY	native	
Fritillaria micrantha A. Heller	LILIACEAE	BROWN BELLS	native	
Fritillaria ojaiensis Davidson	LILIACEAE	OJAI FRITILLARY	native	
Fritillaria pinetorum Davidson	LILIACEAE	PINE FRITILLARY	native	
Fritillaria pluriflora Torr. ex Benth.	LILIACEAE	ADOBE-LILY	native	
Fritillaria pudica (Pursh) Spreng.	LILIACEAE	YELLOW FRITILLARY	native	
Fritillaria purdyi Eastw.	LILIACEAE	PURDY'S FRITILLARY	native	
Fritillaria recurva Benth.	LILIACEAE	SCARLET FRITILLARY	native	
Fritillaria striata Eastw.	LILIACEAE	STRIPED ADOBE-LILY	native	
Fritillaria viridea Kellogg	LILIACEAE	SAN BENITO FRITILLARY	native	
Fuchsia magellanica Lam.	ONAGRACEAE		naturalized	
Fumaria capreolata L.	PAPAVERACEAE	WHITE RAMPING FUMITORY	naturalized	
Fumaria officinalis L.	PAPAVERACEAE	FUMITORY	naturalized	
Fumaria parviflora Lam.	PAPAVERACEAE		naturalized	
Funastrum crispum (Benth.) Schltr.	APOCYNACEAE	WAVYLEAF TWINEVINE	native	
Funastrum cynanchoides (Decne.) Schltr.	APOCYNACEAE		native	
Funastrum cynanchoides (Decne.) Schltr. var. hartwegii (Vail) Krings	APOCYNACEAE	CLIMBING MILKWEED	native	
Funastrum hirtellum (A. Gray) Schltr.	APOCYNACEAE	TRAILING TOWNULA	native	
Funastrum utahense (Engelm.) Liede & Meve	APOCYNACEAE	UTAH VINE MILKWEED	native	
Galeopsis tetrahit L.	LAMIACEAE		naturalized	acceptance uncertain
Galinsoga parviflora Cav.	ASTERACEAE		naturalized	
Galinsoga parviflora Cav. var. parviflora	ASTERACEAE		naturalized	
Galium ambiguum W. Wight	RUBIACEAE	YOLLA BOLLY BEDSTRAW	native	
Galium ambiguum Wight subsp. ambiguum	RUBIACEAE		native	
Galium ambiguum Wight subsp. siskiyouense (Ferris) Dempster & Stebbins	RUBIACEAE		native	
Galium andrewsii A. Gray	RUBIACEAE	PHLOX-LEAVED BEDSTRAW	native	
Galium andrewsii A. Gray subsp. andrewsii	RUBIACEAE		native	
Galium andrewsii A. Gray subsp. gatense (Dempster) Dempster & Stebbins	RUBIACEAE	PHLOX-LEAF SERPENTINE BEDSTRAW	native	
Galium andrewsii A. Gray subsp. intermedium Dempster & Stebbins	RUBIACEAE		native	
Galium angustifolium Nutt. ex A. Gray	RUBIACEAE	NARROWLY LEAVED BEDSTRAW	native	
Galium angustifolium Nutt. ex A. Gray subsp. angustifolium	RUBIACEAE		native	
Galium angustifolium Nutt. ex A. Gray subsp. borregoense Dempster & Stebbins	RUBIACEAE	BORREGO BEDSTRAW	native	
Galium angustifolium Nutt. ex A. Gray subsp. foliosum (Hilend & J. T. Howell) Dempster & Stebbins	RUBIACEAE		native	
Galium angustifolium Nutt. ex A. Gray subsp. gabrielense (Munz & I. M. Johnst.) Dempster & Stebbins	RUBIACEAE	SAN ANTONIO CANYON BEDSTRAW	native	
Galium angustifolium Nutt. ex A. Gray subsp. gracillimum Dempster & Stebbins	RUBIACEAE	SLENDER BEDSTRAW	native	
Galium angustifolium Nutt. ex A. Gray subsp. jacinticum Dempster & Stebbins	RUBIACEAE	SAN JACINTO MOUNTAINS BEDSTRAW	native	
Galium angustifolium Nutt. ex A. Gray subsp. nudicaule Dempster & Stebbins	RUBIACEAE		native	
Galium angustifolium Nutt. ex A. Gray subsp. onycense (Dempster) Dempster & Stebbins	RUBIACEAE	ONYX PEAK BEDSTRAW	native	
Galium aparine L.	RUBIACEAE	GOOSE GRASS	native	
Galium argense Dempster & Ehrend.	RUBIACEAE		native	
Galium bifolium S. Watson	RUBIACEAE	LOW MOUNTAIN BEDSTRAW	native	
Galium bolanderi A. Gray	RUBIACEAE	BOLANDER'S BEDSTRAW	native	
Galium boreale L.	RUBIACEAE	NORTHERN BEDSTRAW	native	
Galium buxifolium Greene	RUBIACEAE	BOX BEDSTRAW	native	
Galium californicum Hook. & Arn.	RUBIACEAE	CALIFORNIA BEDSTRAW	native	
Galium californicum Hook. & Arn. subsp. californicum	RUBIACEAE		native	
Galium californicum Hook. & Arn. subsp. flaccidum (Greene) Dempster & Stebbins	RUBIACEAE		native	
Galium californicum Hook. & Arn. subsp. luciense Dempster & Stebbins	RUBIACEAE	CONE PEAK BEDSTRAW	native	
Galium californicum Hook. & Arn. subsp. maritimum Dempster & Stebbins	RUBIACEAE		native	
Galium californicum Hook. & Arn. subsp. miguelense (Greene) Dempster & Stebbins	RUBIACEAE	SAN MIGUEL ISLAND BEDSTRAW	native	
Galium californicum Hook. & Arn. subsp. primum Dempster & Stebbins	RUBIACEAE	ALVIN MEADOW BEDSTRAW	native	
Galium californicum Hook. & Arn. subsp. sierrae Dempster & Stebbins	RUBIACEAE	EL DORADO BEDSTRAW	native	
Galium catalinense A. Gray	RUBIACEAE		native	
Galium catalinense A. Gray subsp. acrispum Dempster	RUBIACEAE	SAN CLEMENTE ISLAND BEDSTRAW	native	
Galium catalinense A. Gray subsp. catalinense	RUBIACEAE	SANTA CATALINA ISLAND BEDSTRAW	native	
Galium clementis Eastw.	RUBIACEAE	SANTA LUCIA BEDSTRAW	native	
Galium cliftonsmithii (Dempster) Dempster & Stebbins	RUBIACEAE	SANTA BARBARA BEDSTRAW	native	
Galium divaricatum Lam.	RUBIACEAE	LAMARCK'S BEDSTRAW	naturalized	
Galium glabrescens (Ehrend.) Dempster & Ehrend.	RUBIACEAE		native	
Galium glabrescens (Ehrend.) Dempster & Ehrend. subsp. glabrescens	RUBIACEAE		native	
Galium glabrescens (Ehrend.) Dempster & Ehrend. subsp. modocense Dempster & Ehrend.	RUBIACEAE	MODOC BEDSTRAW	native	
Galium grande McClatchie	RUBIACEAE	SAN GABRIEL BEDSTRAW	native	
Galium grayanum Ehrend.	RUBIACEAE	GRAY'S BEDSTRAW	native	
Galium grayanum Ehrend. var. grayanum	RUBIACEAE		native	
Galium grayanum Ehrend. var. nanum Dempster & Ehrend.	RUBIACEAE		native	
Galium hallii Munz & I. M. Johnst.	RUBIACEAE	NODDING BEDSTRAW	native	
Galium hardhamiae Dempster	RUBIACEAE	HARDHAM'S BEDSTRAW	native	
Galium hilendiae Dempster & Ehrend.	RUBIACEAE	HILEND'S BEDSTRAW	native	
Galium hilendiae Dempster & Ehrend. subsp. carneum (Hilend & J. T. Howell) Dempster & Ehrend.	RUBIACEAE	PANAMINT MOUNTAINS BEDSTRAW	native	
Galium hilendiae Dempster & Ehrend. subsp. hilendiae	RUBIACEAE		native	
Galium hilendiae Dempster & Ehrend. subsp. kingstonense (Dempster) Dempster & Ehrend.	RUBIACEAE	KINGSTON MOUNTAINS BEDSTRAW	native	
Galium hypotrichium A. Gray	RUBIACEAE	ALPINE BEDSTRAW	native	
Galium hypotrichium A. Gray subsp. hypotrichium	RUBIACEAE		native	
Galium hypotrichium A. Gray subsp. inyoense Dempster & Ehrend.	RUBIACEAE		native	
Galium hypotrichium A. Gray subsp. subalpinum (Hilend & J. T. Howell) Ehrend.	RUBIACEAE		native	
Galium hypotrichium A. Gray subsp. tomentellum Ehrend.	RUBIACEAE	TELESCOPE PEAK BEDSTRAW	native	
Galium jepsonii Hilend & J. T. Howell	RUBIACEAE	JEPSON'S BEDSTRAW	native	
Galium johnstonii Dempster & Stebbins	RUBIACEAE	JOHNSTON'S BEDSTRAW	native	
Galium magnifolium (Dempster) Dempster	RUBIACEAE		native	
Galium matthewsii A. Gray	RUBIACEAE	MATTHEWS' BEDSTRAW	native	
Galium mexicanum Kunth	RUBIACEAE		native	
Galium mexicanum Kunth subsp. asperulum (A. Gray) Dempster	RUBIACEAE		native	
Galium mollugo L.	RUBIACEAE	HEDGE BEDSTRAW	naturalized	
Galium multiflorum Kellogg	RUBIACEAE	KELLOGG'S BEDSTRAW	native	
Galium munzii Hilend & J. T. Howell	RUBIACEAE	MUNZ'S BEDSTRAW	native	
Galium murale (L.) All.	RUBIACEAE	TINY BEDSTRAW	naturalized	
Galium muricatum W. Wight	RUBIACEAE	HUMBOLDT BEDSTRAW	native	
Galium nuttallii A. Gray	RUBIACEAE	SAN DIEGO BEDSTRAW	native	
Galium nuttallii A. Gray subsp. insulare Ferris	RUBIACEAE	NUTTALL'S ISLAND BEDSTRAW	native	
Galium nuttallii A. Gray subsp. nuttallii	RUBIACEAE		native	
Galium oreganum Britton	RUBIACEAE	OREGON BEDSTRAW	native	
Galium parishii Hilend & J. T. Howell	RUBIACEAE	PARISH'S BEDSTRAW	native	
Galium parisiense L.	RUBIACEAE	WALL BEDSTRAW	naturalized	
Galium porrigens Dempster	RUBIACEAE	CLIMBING BEDSTRAW	native	
Galium porrigens Dempster var. porrigens	RUBIACEAE		native	
Galium porrigens Dempster var. tenue (Dempster) Dempster	RUBIACEAE		native	
Galium proliferum A. Gray	RUBIACEAE	DESERT BEDSTRAW	native	
Galium serpenticum Dempster	RUBIACEAE		native	
Galium serpenticum Dempster subsp. scotticum Dempster & Ehrend.	RUBIACEAE	SCOTT MOUNTAIN BEDSTRAW	native	
Galium serpenticum Dempster subsp. warnerense Dempster & Ehrend.	RUBIACEAE	WARNER MOUNTAINS BEDSTRAW	native	
Galium sparsiflorum W. Wight	RUBIACEAE	SEQUOIA BEDSTRAW	native	
Galium sparsiflorum W. Wight subsp. glabrius Dempster & Stebbins	RUBIACEAE		native	
Galium sparsiflorum W. Wight subsp. sparsiflorum	RUBIACEAE		native	
Galium stellatum Kellogg	RUBIACEAE		native	
Galium tricornutum Dandy	RUBIACEAE	ROUGH CORN BEDSTRAW	native	
Galium trifidum L.	RUBIACEAE		native	
Galium trifidum L. subsp. columbianum (Rydb.) Hultén	RUBIACEAE		native	
Galium trifidum L. subsp. subbiflorum (Wiegand) Puff	RUBIACEAE		native	
Galium triflorum Michx.	RUBIACEAE	SWEET-SCENTED BEDSTRAW	native	
Galium wrightii A. Gray	RUBIACEAE	WRIGHT'S BEDSTRAW	native	
Gambelia speciosa Nutt.	PLANTAGINACEAE	SHOWY GREENBRIGHT	native	
Gamochaeta argyrinea G. L. Nesom	ASTERACEAE		naturalized	
Gamochaeta calviceps (Fernald) Cabrera	ASTERACEAE		naturalized	
Gamochaeta coarctata (Willd.) Kerg.	ASTERACEAE		naturalized	
Gamochaeta pensylvanica (Willd.) Cabrera	ASTERACEAE		naturalized	
Gamochaeta stagnalis (I.M. Johnst.) Anderb.	ASTERACEAE		naturalized	
Gamochaeta ustulata (Nutt.) Holub	ASTERACEAE		native	
Garrya buxifolia A. Gray	GARRYACEAE		native	
Garrya congdonii Eastw.	GARRYACEAE		native	
Garrya elliptica Lindl.	GARRYACEAE		native	
Garrya flavescens S. Watson	GARRYACEAE		native	
Garrya fremontii Torr.	GARRYACEAE		native	
Garrya veatchii Kellogg	GARRYACEAE		native	
Gastridium phleoides (Nees & Meyen) C. E. Hubb.	POACEAE	NIT GRASS	naturalized	
Gaultheria humifusa (Graham) Rydb.	ERICACEAE	ALPINE WINTERGREEN	native	
Gaultheria ovatifolia A. Gray	ERICACEAE	SLENDER WINTERGREEN	native	
Gaultheria shallon Pursh	ERICACEAE	SALAL	native	
Gayophytum decipiens H. Lewis & Szweyk.	ONAGRACEAE		native	
Gayophytum diffusum Torr. & A. Gray	ONAGRACEAE		native	
Gayophytum diffusum Torr. & A. Gray subsp. diffusum	ONAGRACEAE		native	
Gayophytum diffusum Torr. & A. Gray subsp. parviflorum H. Lewis & Szweyk.	ONAGRACEAE		native	
Gayophytum eriospermum Coville	ONAGRACEAE		native	
Gayophytum heterozygum H. Lewis & Szweyk.	ONAGRACEAE		native	
Gayophytum humile A. Juss.	ONAGRACEAE		native	
Gayophytum oligospermum H. Lewis & Szweyk.	ONAGRACEAE		native	
Gayophytum racemosum Torr. & A. Gray	ONAGRACEAE		native	
Gayophytum ramosissimum Torr. & A. Gray	ONAGRACEAE		native	
Gazania linearis (Thunb.) Druce	ASTERACEAE		naturalized	
Genista canariensis L.	FABACEAE		naturalized	
Genista linifolia L.	FABACEAE		naturalized	
Genista monosperma (L.) Lam.	FABACEAE	BRIDAL VEIL BROOM	naturalized	
Genista monspessulana (L.) L. A. S. Johnson	FABACEAE	FRENCH BROOM	naturalized	
Gentiana affinis Griseb.	GENTIANACEAE		native	
Gentiana affinis Griseb. var. ovata A. Gray	GENTIANACEAE	OREGON GENTIAN	native	
Gentiana calycosa Griseb.	GENTIANACEAE	EXPLORERS' GENTIAN	native	
Gentiana fremontii Torr.	GENTIANACEAE	FREMONT'S GENTIAN	native	
Gentiana newberryi A. Gray	GENTIANACEAE	ALPINE GENTIAN	native	
Gentiana newberryi A. Gray var. newberryi	GENTIANACEAE		native	
Gentiana newberryi A. Gray var. tiogana (A. Heller) J. S. Pringle	GENTIANACEAE		native	
Gentiana plurisetosa C. T. Mason	GENTIANACEAE	KLAMATH GENTIAN	native	
Gentiana prostrata Haenke	GENTIANACEAE	PYGMY GENTIAN	native	
Gentiana sceptrum Griseb.	GENTIANACEAE	KING'S SCEPTER GENTIAN	native	
Gentiana setigera A. Gray	GENTIANACEAE	MENDOCINO GENTIAN	native	
Gentianella amarella (L.) Börner	GENTIANACEAE		native	
Gentianella amarella (L.) Börner subsp. acuta (Michx.) J. M. Gillett	GENTIANACEAE	NORTHERN GENTIAN	native	
Gentianopsis holopetala (A. Gray) H. H. Iltis	GENTIANACEAE	SIERRA GENTIAN	native	
Gentianopsis simplex (A. Gray) H. H. Iltis	GENTIANACEAE	HIKERS' GENTIAN	native	
Geraea canescens Torr. & A. Gray	ASTERACEAE	DESERT-SUNFLOWER	native	
Geraea viscida (A. Gray) S. F. Blake	ASTERACEAE	STICKY GERAEA	native	
Geranium aequale (Bab.) Aedo	GERANIACEAE		naturalized	
Geranium bicknellii Britton	GERANIACEAE		native	
Geranium californicum G. N. Jones & F. L. Jones	GERANIACEAE		native	
Geranium carolinianum L.	GERANIACEAE		native	
Geranium columbinum L.	GERANIACEAE		naturalized	
Geranium core-core Steud.	GERANIACEAE		naturalized	
Geranium dissectum L.	GERANIACEAE		naturalized	
Geranium lucidum L.	GERANIACEAE		naturalized	
Geranium molle L.	GERANIACEAE		naturalized	
Geranium oreganum Howell	GERANIACEAE		native	
Geranium potentilloides L'Hér. ex DC.	GERANIACEAE		naturalized	
Geranium purpureum Vill.	GERANIACEAE		naturalized	
Geranium pusillum L.	GERANIACEAE		naturalized	
Geranium richardsonii Fisch. & Trautv.	GERANIACEAE		native	
Geranium robertianum L.	GERANIACEAE		naturalized	
Geranium rotundifolium L.	GERANIACEAE		naturalized	
Geranium solanderi Carolin	GERANIACEAE		naturalized	
Geranium viscosissimum Fisch. & C. A. Mey.	GERANIACEAE		native	
Geum aleppicum Jacq.	ROSACEAE	YELLOW AVENS	native	
Geum macrophyllum Willd.	ROSACEAE	LARGE-LEAVED AVENS	native	
Geum macrophyllum Willd. var. macrophyllum	ROSACEAE		native	
Geum macrophyllum Willd. var. perincisum (Rydb.) Raup	ROSACEAE		native	
Geum triflorum Pursh	ROSACEAE		native	
Geum triflorum Pursh var. ciliatum (Pursh) Fassett	ROSACEAE	PRAIRIE-SMOKE	native	
Gilia achilleifolia Benth.	POLEMONIACEAE	CALIFORNIA GILIA	native	
Gilia achilleifolia Benth. subsp. achilleifolia	POLEMONIACEAE		native	
Gilia achilleifolia Benth. subsp. multicaulis (Benth.) V. E. Grant & A. D. Grant	POLEMONIACEAE		native	
Gilia aliquanta A. D. Grant & V. E. Grant	POLEMONIACEAE	WESTERN GILIA	native	
Gilia aliquanta A. D. Grant & V. E. Grant subsp. aliquanta	POLEMONIACEAE		native	
Gilia aliquanta A. D. Grant & V. E. Grant subsp. breviloba A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Gilia angelensis V. E. Grant	POLEMONIACEAE	CHAPARRAL GILIA	native	
Gilia austro-occidentalis (A. D. Grant & V. E. Grant) A. D. Grant & V. E. Grant	POLEMONIACEAE	SOUTHWESTERN GILIA	native	
Gilia brecciarum M. E. Jones	POLEMONIACEAE	NEVADA GILIA	native	
Gilia brecciarum M. E. Jones subsp. brecciarum	POLEMONIACEAE		native	
Gilia brecciarum M. E. Jones subsp. neglecta A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Gilia cana (M. E. Jones) A. Heller	POLEMONIACEAE	SHOWY GILIA	native	
Gilia cana (M. E. Jones) A. Heller subsp. bernardina A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Gilia cana (M. E. Jones) A. Heller subsp. cana	POLEMONIACEAE		native	
Gilia cana (M. E. Jones) A. Heller subsp. speciformis A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Gilia cana (M. E. Jones) A. Heller subsp. speciosa (Jeps.) A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Gilia cana (M. E. Jones) A. Heller subsp. triceps (Brand) A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Gilia capitata Sims	POLEMONIACEAE	BLUEHEAD GILIA	native	
Gilia capitata Sims subsp. abrotanifolia (Greene) V. E. Grant	POLEMONIACEAE		native	
Gilia capitata Sims subsp. capitata	POLEMONIACEAE		native	
Gilia capitata Sims subsp. chamissonis (Greene) V. E. Grant	POLEMONIACEAE	BLUE COAST GILIA	native	
Gilia capitata Sims subsp. mediomontana V. E. Grant	POLEMONIACEAE		native	
Gilia capitata Sims subsp. pacifica V. E. Grant	POLEMONIACEAE	PACIFIC GILIA	native	
Gilia capitata Sims subsp. pedemontana V. E. Grant	POLEMONIACEAE		native	
Gilia capitata Sims subsp. staminea (Greene) V. E. Grant	POLEMONIACEAE		native	
Gilia capitata Sims subsp. tomentosa (Brand) V. E. Grant	POLEMONIACEAE	WOOLLY-HEADED GILIA	native	
Gilia clivorum (Jeps.) V. E. Grant	POLEMONIACEAE	PURPLESPOT GILIA	native	
Gilia clokeyi H. Mason	POLEMONIACEAE	CLOKEY'S GILIA	native	
Gilia diegensis (Munz) A. D. Grant & V. E. Grant	POLEMONIACEAE	COASTAL GILIA	native	
Gilia inconspicua (Sm.) Sweet	POLEMONIACEAE	SHY GILIA	native	
Gilia interior (H. Mason & A. D. Grant) A. D. Grant	POLEMONIACEAE	INLAND GILIA	native	
Gilia jacens A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Gilia latiflora (A. Gray) A. Gray	POLEMONIACEAE	BROAD-FLOWERED GILIA	native	
Gilia latiflora (A. Gray) A. Gray subsp. cuyamensis A. D. Grant & V. E. Grant	POLEMONIACEAE	CUYAMA GILIA	native	
Gilia latiflora (A. Gray) A. Gray subsp. davyi (Milliken) A. D. Grant & V. E. Grant	POLEMONIACEAE	DAVY'S BROAD-FLOWERED GILIA	native	
Gilia latiflora (A. Gray) A. Gray subsp. elongata A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Gilia latiflora (A. Gray) A. Gray subsp. latiflora	POLEMONIACEAE	BROAD-LEAVED GILIA	native	
Gilia leptantha Parish	POLEMONIACEAE	FINEFLOWERED GILIA	native	
Gilia leptantha Parish subsp. leptantha	POLEMONIACEAE	SAN BERNARDINO GILIA	native	
Gilia leptantha Parish subsp. pinetorum A. D. Grant & V. E. Grant	POLEMONIACEAE	PINE GILIA	native	
Gilia leptantha Parish subsp. purpusii (Milliken) A. D. Grant & V. E. Grant	POLEMONIACEAE	PURPUS' FINEFLOWERED GILIA	native	
Gilia leptantha Parish subsp. transversa A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Gilia malior A. G. Day & V. E. Grant	POLEMONIACEAE	GREAT BASIN GILIA	native	
Gilia millefoliata Fisch. & C. A. Mey.	POLEMONIACEAE	DARK-EYED GILIA	native	
Gilia minor A. D. Grant & V. E. Grant	POLEMONIACEAE	LITTLE GILIA	native	
Gilia modocensis Eastw.	POLEMONIACEAE	MODOC GILIA	native	
Gilia nevinii A. Gray	POLEMONIACEAE	NEVIN'S GILIA	native	
Gilia ochroleuca M. E. Jones	POLEMONIACEAE	VOLCANIC GILIA	native	
Gilia ochroleuca M. E. Jones subsp. bizonata A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Gilia ochroleuca M. E. Jones subsp. exilis (A. Gray) A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Gilia ochroleuca M. E. Jones subsp. ochroleuca	POLEMONIACEAE		native	
Gilia ochroleuca M. E. Jones subsp. vivida (A. D. Grant & V. E. Grant) A. D. Grant & V. E. Grant	POLEMONIACEAE		native	
Gilia ophthalmoides Brand	POLEMONIACEAE	YELLOW-EYED GILIA	native	
Gilia salticola Eastw.	POLEMONIACEAE	SALT GILIA	native	
Gilia scopulorum M. E. Jones	POLEMONIACEAE	ROCK GILIA	native	
Gilia sinuata Benth.	POLEMONIACEAE	ROSY GILIA	native	
Gilia stellata A. Heller	POLEMONIACEAE	STAR GILIA	native	
Gilia tenuiflora Benth.	POLEMONIACEAE		native	
Gilia tenuiflora Benth. subsp. amplifaucalis A. D. Grant & V. E. Grant	POLEMONIACEAE	TRUMPET-THROATED GILIA	native	
Gilia tenuiflora Benth. subsp. arenaria (Benth.) A. D. Grant & V. E. Grant	POLEMONIACEAE	MONTEREY GILIA	native	
Gilia tenuiflora Benth. subsp. hoffmannii (Eastw.) A. D. Grant & V. E. Grant	POLEMONIACEAE	HOFFMANN'S SLENDER-FLOWERED GILIA	native	
Gilia tenuiflora Benth. subsp. tenuiflora	POLEMONIACEAE	GREATER YELLOWTHROAT GILIA	native	
Gilia transmontana (H. Mason & A. D. Grant) A. D. Grant & V. E. Grant	POLEMONIACEAE	TRANSMONTANE GILIA	native	
Gilia tricolor Benth.	POLEMONIACEAE	BIRD'S-EYE GILIA	native	
Gilia tricolor Benth. subsp. diffusa (Congdon) H. Mason & A. D. Grant	POLEMONIACEAE		native	
Gilia tricolor Benth. subsp. tricolor	POLEMONIACEAE		native	
Gilia yorkii Shevock & A. G. Day	POLEMONIACEAE	MONARCH GILIA	native	
Gilmania luteola (Coville) Coville	POLYGONACEAE	GOLDEN-CARPET GILMANIA	native	
Githopsis diffusa A. Gray	CAMPANULACEAE		native	
Githopsis diffusa A. Gray subsp. candida (Ewan) Morin	CAMPANULACEAE		native	
Githopsis diffusa A. Gray subsp. diffusa	CAMPANULACEAE		native	
Githopsis diffusa A. Gray subsp. filicaulis (Ewan) Morin	CAMPANULACEAE	MISSION CANYON BLUECUP	native	
Githopsis diffusa A. Gray subsp. robusta Morin	CAMPANULACEAE		native	
Githopsis pulchella Vatke	CAMPANULACEAE		native	
Githopsis pulchella Vatke subsp. campestris Morin	CAMPANULACEAE		native	
Githopsis pulchella Vatke subsp. pulchella	CAMPANULACEAE		native	
Githopsis pulchella Vatke subsp. serpentinicola Morin	CAMPANULACEAE	SERPENTINE BLUECUP	native	
Githopsis pulchella Vatke var. glabra (Jeps.) Morin	CAMPANULACEAE		native	
Githopsis pulchella Vatke var. pulchella	CAMPANULACEAE		native	
Githopsis specularioides Nutt.	CAMPANULACEAE		native	
Githopsis tenella Morin	CAMPANULACEAE	DELICATE BLUECUP	native	
Glaux maritima L.	MYRSINACEAE		native	
Glebionis coronaria (L.) Spach	ASTERACEAE	CROWN DAISY	naturalized	
Glebionis segetum (L.) Fourr.	ASTERACEAE	CORN CHRYSANTHEMUM	naturalized	
Glechoma hederacea L.	LAMIACEAE		naturalized	
Gleditsia triacanthos L.	FABACEAE	HONEY LOCUST	naturalized	
Glehnia littoralis F. Schmidt ex Miq.	APIACEAE		native	
Glehnia littoralis F. Schmidt ex Miq. subsp. leiocarpa (Mathias) Hultén	APIACEAE	AMERICAN GLEHNIA	native	
Glinus lotoides L.	MOLLUGINACEAE		naturalized	
Glinus radiatus (Ruiz & Pav.) Rohrb.	MOLLUGINACEAE	SHINING DAMASCISA	naturalized	
Glossopetalon pungens Brandegee	CROSSOSOMATACEAE	PUNGENT GLOSSOPETALON	native	
Glossopetalon spinescens A. Gray	CROSSOSOMATACEAE		native	
Glossopetalon spinescens A. Gray var. aridum M. E. Jones	CROSSOSOMATACEAE	NEVADA GREASEWOOD	native	
Glyceria X occidentalis (Piper) J. C. Nelson	POACEAE	WESTERN MANNA GRASS	naturalized	
Glyceria borealis (Nash) Batch.	POACEAE	BOREAL MANNA GRASS	native	
Glyceria declinata Bréb.	POACEAE	LOW MANNA GRASS	naturalized	
Glyceria elata (Nash ex Rydb.) M. E. Jones	POACEAE	FOWL MANNA GRASS	native	
Glyceria fluitans (L.) R. Br.	POACEAE	WATER MANNA GRASS	naturalized	
Glyceria grandis S. Watson	POACEAE	AMERICAN MANNA GRASS	native	
Glyceria leptostachya Buckley	POACEAE	NARROW MANNA GRASS	native	
Glyceria striata (Lam.) Hitchc.	POACEAE	RIDGED MANNA GRASS	native	
Glycyrrhiza glabra L.	FABACEAE	LICORICE	naturalized	
Glycyrrhiza lepidota Pursh	FABACEAE	WILD LICORICE	native	
Glyptopleura marginata D. C. Eaton	ASTERACEAE		native	
Glyptopleura setulosa A. Gray	ASTERACEAE		native	
Gnaphalium palustre Nutt.	ASTERACEAE		native	
Goodmania luteola (Parry) Reveal & Ertter	POLYGONACEAE	GOLDEN GOODMANIA	native	
Goodyera oblongifolia Raf.	ORCHIDACEAE	RATTLESNAKE-PLANTAIN	native	
Gratiola ebracteata Benth. ex A.DC.	PLANTAGINACEAE	BRACTLESS HEDGE-HYSSOP	native	
Gratiola heterosepala H. Mason & Bacig.	PLANTAGINACEAE	BOGGS LAKE HEDGE-HYSSOP	native	
Gratiola neglecta Torr.	PLANTAGINACEAE	CLAMMY HEDGE-HYSSOP	native	
Grayia spinosa (Hook.) Moq.	CHENOPODIACEAE		native	
Grevillea robusta A. Cunn. ex R. Br.	PROTEACEAE		naturalized	
Grindelia camporum Greene	ASTERACEAE		native	
Grindelia fraxinipratensis Reveal & Beatley	ASTERACEAE	ASH MEADOWS GUMPLANT	native	
Grindelia hallii Steyerm.	ASTERACEAE	SAN DIEGO GUMPLANT	native	
Grindelia hirsutula Hook. & Arn.	ASTERACEAE		native	
Grindelia nana Nutt.	ASTERACEAE		native	
Grindelia squarrosa (Pursh) Dunal	ASTERACEAE		naturalized	
Grindelia squarrosa (Pursh) Dunal var. serrulata (Rydb.) Steyerm.	ASTERACEAE		naturalized	
Grindelia stricta DC.	ASTERACEAE		native	
Grindelia stricta DC. var. angustifolia (A. Gray) M. A. Lane	ASTERACEAE	MARSH GUMPLANT	native	
Grindelia stricta DC. var. platyphylla (Greene) M. A. Lane	ASTERACEAE		native	
Grindelia stricta DC. var. stricta	ASTERACEAE		native	
Grusonia parishii (Orcutt) Pinkava	CACTACEAE	PARISH'S CLUB-CHOLLA	native	
Grusonia pulchella (Engelm.) H. Rob.	CACTACEAE	BEAUTIFUL CLUB-CHOLLA	native	
Guilleminea densa (Willd.) Moq.	AMARANTHACEAE		naturalized	
Gunnera tinctoria (Molina) Mirb.	GUNNERACEAE	CHILEAN-RHUBARB	naturalized	
Gutierrezia californica (DC.) Torr. & A. Gray	ASTERACEAE	CALIFORNIA MATCHWEED	native	
Gutierrezia microcephala (DC.) A. Gray	ASTERACEAE	STICKY SNAKEWEED	native	
Gutierrezia sarothrae (Pursh) Britton & Rusby	ASTERACEAE	MATCHWEED	native	
Gymnosteris parvula A. Heller	POLEMONIACEAE		native	
Gypsophila elegans M. Bieb.	CARYOPHYLLACEAE	SHOWY BABY'S-BREATH	naturalized	
Gypsophila paniculata L.	CARYOPHYLLACEAE	BABY'S-BREATH	naturalized	
Hackelia amethystina J. T. Howell ex Eastw.	BORAGINACEAE	AMETHYST STICKSEED	native	
Hackelia bella (J. F. Macbr.) I. M. Johnst.	BORAGINACEAE	BEAUTIFUL STICKSEED	native	
Hackelia brevicula (Jeps.) J. L. Gentry	BORAGINACEAE	POISON CANYON STICKSEED	native	
Hackelia californica (A. Gray) I. M. Johnst.	BORAGINACEAE	CALIFORNIA STICKSEED	native	
Hackelia cusickii (Piper) Brand	BORAGINACEAE	CUSICK'S STICKSEED	native	
Hackelia floribunda (Lehm.) I. M. Johnst.	BORAGINACEAE	MANY-FLOWERED STICKSEED	native	
Hackelia micrantha (Eastw.) J. L. Gentry	BORAGINACEAE	MEADOW STICKSEED	native	
Hackelia mundula (Jeps.) Ferris	BORAGINACEAE	PINK-FLOWERED STICKSEED	native	
Hackelia nervosa (Kellogg) I. M. Johnst.	BORAGINACEAE	SIERRAN STICKSEED	native	
Hackelia setosa (Piper) I. M. Johnst.	BORAGINACEAE	SISKIYOU STICKSEED	native	
Hackelia sharsmithii I. M. Johnst.	BORAGINACEAE	SHARSMITH'S STICKSEED	native	
Hackelia velutina (Piper) I. M. Johnst.	BORAGINACEAE	VELVETY STICKSEED	native	
Hainardia cylindrica (Willd.) Greuter	POACEAE		naturalized	
Halimolobos jaegeri (Munz) Rollins	BRASSICACEAE		native	
Halogeton glomeratus (M. Bieb.) C. A. Mey.	CHENOPODIACEAE	SALTLOVER	naturalized	
Harmonia doris-nilesiae (T. W. Nelson & J. P. Nelson) B. G. Baldwin	ASTERACEAE	NILES' HARMONIA	native	
Harmonia guggolziorum B. G. Baldwin	ASTERACEAE	GUGGOLZ'S HARMONIA	native	
Harmonia hallii (D. D. Keck) B. G. Baldwin	ASTERACEAE	HALL'S HARMONIA	native	
Harmonia nutans (Greene) B. G. Baldwin	ASTERACEAE	NODDING HARMONIA	native	
Harmonia stebbinsii (T. W. Nelson & J. P. Nelson) B. G. Baldwin	ASTERACEAE	STEBBINS' HARMONIA	native	
Harpagonella palmeri A. Gray	BORAGINACEAE	PALMER'S GRAPPLINGHOOK	native	
Hastingsia alba (Durand) S. Watson	AGAVACEAE		native	
Hastingsia serpentinicola Becking	AGAVACEAE		native	
Hazardia brickellioides (S. F. Blake) W. D. Clark	ASTERACEAE	BRICKELL GOLDENBUSH	native	
Hazardia cana (A. Gray) Greene	ASTERACEAE	SAN CLEMENTE ISLAND HAZARDIA	native	
Hazardia detonsa (Greene) Greene	ASTERACEAE	ISLAND HAZARDIA	native	
Hazardia orcuttii (A. Gray) Greene	ASTERACEAE	ORCUTT'S HAZARDIA	native	
Hazardia squarrosa (Hook. & Arn.) Greene	ASTERACEAE	SAW-TOOTHED GOLDENBUSH	native	
Hazardia squarrosa (Hook. & Arn.) Greene var. grindelioides (DC.) W. D. Clark	ASTERACEAE		native	
Hazardia squarrosa (Hook. & Arn.) Greene var. obtusa (Greene) Jeps.	ASTERACEAE		native	
Hazardia squarrosa (Hook. & Arn.) Greene var. squarrosa	ASTERACEAE		native	
Hazardia stenolepis (H. M. Hall) Hoover	ASTERACEAE		native	
Hazardia whitneyi (A. Gray) Greene	ASTERACEAE	WHITNEY'S GOLDENBUSH	native	
Hazardia whitneyi (A. Gray) Greene var. discoidea (J. T. Howell) W. D. Clark	ASTERACEAE		native	
Hazardia whitneyi (A. Gray) Greene var. whitneyi	ASTERACEAE		native	
Hecastocleis shockleyi A. Gray	ASTERACEAE		native	
Hedeoma drummondii Benth.	LAMIACEAE	DRUMMOND'S FALSE PENNYROYAL	native	
Hedeoma nana (Torr.) Briq.	LAMIACEAE		native	
Hedeoma nana (Torr.) Briq. subsp. californica W. S. Stewart	LAMIACEAE	CALIFORNIA MOCK PENNYROYAL	native	
Hedera canariensis Willd.	ARALIACEAE	CANARY ISLANDS IVY	naturalized	
Hedera helix L.	ARALIACEAE	ENGLISH IVY	naturalized	
Hedypnois cretica (L.) Dum.Cours.	ASTERACEAE	CRETE WEED	naturalized	
Helenium amarum (Raf.) H. Rock	ASTERACEAE		naturalized	
Helenium amarum (Raf.) H. Rock var. amarum	ASTERACEAE		naturalized	
Helenium autumnale L.	ASTERACEAE		native	
Helenium bigelovii A. Gray	ASTERACEAE		native	
Helenium bolanderi A. Gray	ASTERACEAE		native	
Helenium puberulum DC.	ASTERACEAE		native	
Helianthella californica A. Gray	ASTERACEAE		native	
Helianthella californica A. Gray var. californica	ASTERACEAE		native	
Helianthella californica A. Gray var. nevadensis (Greene) Jeps.	ASTERACEAE		native	
Helianthella californica A. Gray var. shastensis W. A. Weber	ASTERACEAE		native	
Helianthella castanea Greene	ASTERACEAE	DIABLO HELIANTHELLA	native	
Helianthus annuus L.	ASTERACEAE		native	
Helianthus bolanderi A. Gray	ASTERACEAE	BOLANDER'S SUNFLOWER	native	
Helianthus californicus DC.	ASTERACEAE	CALIFORNIA SUNFLOWER	native	
Helianthus ciliaris DC.	ASTERACEAE	BLUEWEED	naturalized	
Helianthus cusickii A. Gray	ASTERACEAE	CUSICK'S SUNFLOWER	native	
Helianthus exilis A. Gray	ASTERACEAE	SERPENTINE SUNFLOWER	native	
Helianthus gracilentus A. Gray	ASTERACEAE	SLENDER SUNFLOWER	native	
Helianthus inexpectatus D.J. Keil & Elvin	ASTERACEAE	NEWHALL SUNFLOWER	native	
Helianthus niveus (Benth.) Brandegee	ASTERACEAE		native	
Helianthus niveus (Benth.) Brandegee subsp. tephrodes (A. Gray) Heiser	ASTERACEAE	ALGODONES DUNES SUNFLOWER	native	
Helianthus nuttallii Torr. & A. Gray	ASTERACEAE		native	
Helianthus nuttallii Torr. & A. Gray subsp. nuttallii	ASTERACEAE	NUTTALL'S SUNFLOWER	native	
Helianthus petiolaris Nutt.	ASTERACEAE	PRAIRIE SUNFLOWER	naturalized	
Helianthus petiolaris Nutt. subsp. canescens (A. Gray) D.J. Keil	ASTERACEAE		native	
Helianthus petiolaris Nutt. subsp. petiolaris	ASTERACEAE		naturalized	
Helichrysum petiolare Hilliard & B. L. Burtt	ASTERACEAE	LICORICE PLANT	naturalized	
Heliomeris multiflora Nutt.	ASTERACEAE		native	
Heliomeris multiflora Nutt. var. nevadensis (A. Nelson) W. F. Yates	ASTERACEAE	NEVADA GOLDENEYE	native	
Heliotropium amplexicaule Vahl	BORAGINACEAE	FRAGRANT HELIOTROPE	naturalized	
Heliotropium convolvulaceum (Nutt.) A. Gray	BORAGINACEAE		native	
Heliotropium convolvulaceum (Nutt.) A. Gray var. californicum (Greene) I. M. Johnst.	BORAGINACEAE	MORNING-GLORY HELIOTROPE	native	
Heliotropium curassavicum L.	BORAGINACEAE		native	
Heliotropium curassavicum L. var. oculatum (A. Heller) I. M. Johnst. ex Tidestr.	BORAGINACEAE	ALKALI HELIOTROPE	native	
Heliotropium europaeum L.	BORAGINACEAE	EUROPEAN HELIOTROPE	naturalized	
Helipterum roseum (Hook.) Benth.	ASTERACEAE		naturalized	acceptance uncertain
Helminthotheca echioides (L.) Holub	ASTERACEAE	BRISTLY OX-TONGUE	naturalized	
Hemieva ranunculifolia (Hook.) Raf.	SAXIFRAGACEAE		native	
Hemitomes congestum A. Gray	ERICACEAE		native	
Hemizonella minima (A. Gray) A. Gray	ASTERACEAE		native	
Hemizonia congesta DC.	ASTERACEAE		native	
Hemizonia congesta DC. subsp. calyculata Babc. & H. M. Hall	ASTERACEAE	MENDOCINO TARPLANT	native	
Hemizonia congesta DC. subsp. clevelandii (Greene) Babc. & H. M. Hall	ASTERACEAE		native	
Hemizonia congesta DC. subsp. congesta	ASTERACEAE	PALE-YELLOW HAYFIELD TARPLANT	native	
Hemizonia congesta DC. subsp. lutescens (Greene) Babc. & H. M. Hall	ASTERACEAE		native	
Hemizonia congesta DC. subsp. luzulifolia (DC.) Babc. & H. M. Hall	ASTERACEAE		native	
Hemizonia congesta DC. subsp. tracyi Babc. & H. M. Hall	ASTERACEAE	TRACY'S TARPLANT	native	
Heracleum maximum W. Bartram	APIACEAE	GIANT HOGWEED	native	
Herissantia crispa (L.) Brizicky	MALVACEAE	CURLY HERISSANTIA	native	
Herniaria hirsuta L.	CARYOPHYLLACEAE		naturalized	
Herniaria hirsuta L. var. cinerea (DC.) Loret & Barrandon	CARYOPHYLLACEAE		naturalized	
Herniaria hirsuta L. var. hirsuta	CARYOPHYLLACEAE		naturalized	
Hesperevax acaulis (Kellogg) Greene	ASTERACEAE	DWARF EVAX	native	
Hesperevax acaulis (Kellogg) Greene var. acaulis	ASTERACEAE	STEMLESS EVAX	native	
Hesperevax acaulis (Kellogg) Greene var. ambusticola Morefield	ASTERACEAE	FIRE EVAX	native	
Hesperevax acaulis (Kellogg) Greene var. robustior Morefield	ASTERACEAE		native	
Hesperevax caulescens (Benth.) A. Gray	ASTERACEAE	HOGWALLOW STARFISH	native	
Hesperevax sparsiflora (A. Gray) Greene	ASTERACEAE	ERECT EVAX	native	
Hesperevax sparsiflora (A. Gray) Greene var. brevifolia (A. Gray) Morefield	ASTERACEAE	SHORTLEAVED EVAX	native	
Hesperevax sparsiflora (A. Gray) Greene var. sparsiflora	ASTERACEAE		native	
Hesperidanthus jaegeri (Rollins) Al-Shehbaz	BRASSICACEAE		native	
Hesperis matronalis L.	BRASSICACEAE	DAME'S ROCKET	naturalized	
Hesperocallis undulata A. Gray	AGAVACEAE		native	
Hesperochiron californicus (Benth.) S. Watson	BORAGINACEAE		native	
Hesperochiron pumilus (Griseb.) Porter	BORAGINACEAE		native	
Hesperocnide tenella Torr.	URTICACEAE		native	
Hesperocyparis abramsiana (C. B. Wolf) Bartel	CUPRESSACEAE	SANTA CRUZ CYPRESS	native	
Hesperocyparis abramsiana (C. B. Wolf) Bartel var. abramsiana	CUPRESSACEAE		native	
Hesperocyparis abramsiana (C. B. Wolf) Bartel var. butanoensis (Silba) Bartel & R.P. Adams	CUPRESSACEAE		native	
Hesperocyparis bakeri (Jeps.) Bartel	CUPRESSACEAE	SISKIYOU CYPRESS	native	
Hesperocyparis forbesii (Jeps.) Bartel	CUPRESSACEAE	TECATE CYPRESS	native	
Hesperocyparis goveniana (Gordon) Bartel	CUPRESSACEAE	GOWEN CYPRESS	native	
Hesperocyparis macnabiana (A. Murray bis) Bartel	CUPRESSACEAE	MCNAB CYPRESS	native	
Hesperocyparis macrocarpa (Hartw.) Bartel	CUPRESSACEAE	MONTEREY CYPRESS	native	
Hesperocyparis nevadensis (Abrams) Bartel	CUPRESSACEAE	PIUTE CYPRESS	native	
Hesperocyparis pygmaea (Lemmon) Bartel	CUPRESSACEAE	PYGMY CYPRESS	native	
Hesperocyparis sargentii (Jeps.) Bartel	CUPRESSACEAE	SARGENT CYPRESS	native	
Hesperocyparis stephensonii (C. B. Wolf) Bartel	CUPRESSACEAE	CUYAMACA CYPRESS	native	
Hesperolinon adenophyllum (A. Gray) Small	LINACEAE	GLANDULAR WESTERN FLAX	native	
Hesperolinon bicarpellatum (H. Sharsm.) H. Sharsm.	LINACEAE	TWO-CARPELLATE WESTERN FLAX	native	
Hesperolinon breweri (A. Gray) Small	LINACEAE	BREWER'S WESTERN FLAX	native	
Hesperolinon californicum (Benth.) Small	LINACEAE		native	
Hesperolinon clevelandii (Greene) Small	LINACEAE		native	
Hesperolinon congestum (A. Gray) Small	LINACEAE	MARIN WESTERN FLAX	native	
Hesperolinon didymocarpum H. Sharsm.	LINACEAE	LAKE COUNTY WESTERN FLAX	native	
Hesperolinon disjunctum H. Sharsm.	LINACEAE		native	
Hesperolinon drymarioides (Curran) Small	LINACEAE	DRYMARIA-LIKE WESTERN FLAX	native	
Hesperolinon micranthum (A. Gray) Small	LINACEAE		native	
Hesperolinon spergulinum (A. Gray) Small	LINACEAE		native	
Hesperolinon tehamense H. Sharsm.	LINACEAE	TEHAMA COUNTY WESTERN FLAX	native	
Hesperomecon linearis (Benth.) Greene	PAPAVERACEAE		native	
Hesperoyucca whipplei (Torr.) Trel.	AGAVACEAE		native	
Heteranthemis viscidihirta Schott	ASTERACEAE		naturalized	
Heteranthera dubia (Jacq.) MacMill.	PONTEDERIACEAE	WATER STAR-GRASS	native	
Heteranthera limosa (Sw.) Willd.	PONTEDERIACEAE		naturalized	
Heterocodon rariflorum Nutt.	CAMPANULACEAE		native	
Heteromeles arbutifolia (Lindl.) M. Roem.	ROSACEAE		native	
Heteropogon contortus (L.) P. Beauv. ex Roem. & Schult.	POACEAE	TANGLEHEAD	naturalized	
Heterotheca grandiflora Nutt.	ASTERACEAE	TELEGRAPH WEED	native	
Heterotheca monarchensis D. A. York, Shevock, & Semple	ASTERACEAE	MONARCH GOLDENASTER	native	
Heterotheca oregona (Nutt.) Shinners	ASTERACEAE	RAYLESS GOLDENASTER	native	
Heterotheca oregona (Nutt.) Shinners var. compacta (D. D. Keck) Semple	ASTERACEAE		native	
Heterotheca oregona (Nutt.) Shinners var. oregona	ASTERACEAE		native	
Heterotheca oregona (Nutt.) Shinners var. rudis (Greene) Semple	ASTERACEAE		native	
Heterotheca oregona (Nutt.) Shinners var. scaberrima (A. Gray) Semple	ASTERACEAE		native	
Heterotheca sessiliflora (Nutt.) Shinners	ASTERACEAE	SESSILEFLOWER GOLDENASTER	native	
Heterotheca sessiliflora (Nutt.) Shinners subsp. bolanderi (A. Gray) Semple	ASTERACEAE		native	
Heterotheca sessiliflora (Nutt.) Shinners subsp. echioides (Benth.) Semple	ASTERACEAE		native	
Heterotheca sessiliflora (Nutt.) Shinners subsp. fastigiata (Greene) Semple	ASTERACEAE		native	
Heterotheca sessiliflora (Nutt.) Shinners subsp. sessiliflora	ASTERACEAE	BEACH GOLDENASTER	native	
Heterotheca shevockii (Semple) Semple	ASTERACEAE	SHEVOCK'S GOLDENASTER	native	
Heterotheca subaxillaris (Lam.) Britton & Rusby	ASTERACEAE		native	
Heterotheca subaxillaris (Lam.) Britton & Rusby subsp. latifolia (Buckley) Semple	ASTERACEAE	CAMPHOR-WEED	native	
Heterotheca villosa (Pursh) Shinners	ASTERACEAE	HAIRY GOLDENASTER	native	
Heterotheca villosa (Pursh) Shinners var. minor (Hook.) Semple	ASTERACEAE		native	
Heterotheca villosa (Pursh) Shinners var. scabra (Eastw.) Semple	ASTERACEAE		native	
Heuchera abramsii Rydb.	SAXIFRAGACEAE	ABRAMS' ALUMROOT	native	
Heuchera brevistaminea Wiggins	SAXIFRAGACEAE	LAGUNA MOUNTAINS ALUMROOT	native	
Heuchera caespitosa Eastw.	SAXIFRAGACEAE		native	
Heuchera cylindrica Douglas	SAXIFRAGACEAE		native	
Heuchera hirsutissima Rosend., Butters, & Lakela	SAXIFRAGACEAE	SHAGGY-HAIRED ALUMROOT	native	
Heuchera maxima Greene	SAXIFRAGACEAE	ISLAND ALUMROOT	native	
Heuchera merriamii Eastw.	SAXIFRAGACEAE		native	
Heuchera micrantha Douglas ex Lindl.	SAXIFRAGACEAE		native	
Heuchera parishii Rydb.	SAXIFRAGACEAE	PARISH'S ALUMROOT	native	
Heuchera parvifolia Nutt. ex Torr. & A. Gray	SAXIFRAGACEAE		native	
Heuchera pilosissima Fisch. & C. A. Mey.	SAXIFRAGACEAE		native	
Heuchera rubescens Torr.	SAXIFRAGACEAE		native	
Hibiscus denudatus Benth.	MALVACEAE	PALE FACE	native	
Hibiscus lasiocarpos Cav.	MALVACEAE		native	
Hibiscus lasiocarpos Cav. var. occidentalis (Torr.) A. Gray	MALVACEAE	WOOLLY ROSE-MALLOW	native	
Hibiscus trionum L.	MALVACEAE	FLOWER-OF-AN-HOUR	naturalized	
Hieracium albiflorum Hook.	ASTERACEAE	WHITE HAWKWEED	native	
Hieracium argutum Nutt.	ASTERACEAE	SOUTHERN HAWKWEED	native	
Hieracium bolanderi A. Gray	ASTERACEAE	BOLANDER'S HAWKWEED	native	
Hieracium greenei A. Gray	ASTERACEAE	GREENE'S HAWKWEED	native	
Hieracium horridum Fr.	ASTERACEAE	PRICKLY HAWKWEED	native	
Hieracium nudicaule (A. Gray) A. Heller	ASTERACEAE	NAKED-STEMMED HAWKWEED	native	
Hieracium parryi Zahn	ASTERACEAE	PARRY'S HAWKWEED	native	
Hieracium scouleri Hook.	ASTERACEAE	WESTERN HAWKWEED	native	
Hieracium triste Willd. ex Spreng.	ASTERACEAE	SLENDER HAWKWEED	native	
Hilaria jamesii (Torr.) Benth.	POACEAE	GALLETA	native	
Hilaria rigida (Thurb.) Scribn.	POACEAE	BIG GALLETA	native	
Hippuris vulgaris L.	PLANTAGINACEAE		native	
Hirschfeldia incana (L.) Lagr.-Fossat	BRASSICACEAE		naturalized	
Hoffmannseggia glauca (Ortega) Eifert	FABACEAE	HOG POTATO	native	
Hoffmannseggia microphylla Torr.	FABACEAE		native	
Hoita macrostachya (DC.) Rydb.	FABACEAE		native	
Hoita orbicularis (Lindl.) Rydb.	FABACEAE		native	
Hoita strobilina (Hook. & Arn.) Rydb.	FABACEAE	LOMA PRIETA HOITA	native	
Holcus lanatus L.	POACEAE	COMMON VELVET GRASS	naturalized	
Holcus mollis L.	POACEAE	CREEPING VELVET GRASS	naturalized	
Hollisteria lanata S. Watson	POLYGONACEAE	FALSE SPIKEFLOWER	native	
Holmgrenanthe petrophila (Coville & C. V. Morton) Elisens	PLANTAGINACEAE	ROCK LADY	native	
Holocarpha heermannii (Greene) D. D. Keck	ASTERACEAE		native	
Holocarpha macradenia (DC.) Greene	ASTERACEAE	SANTA CRUZ TARPLANT	native	
Holocarpha obconica (J. C. Clausen & D. D. Keck) D. D. Keck	ASTERACEAE		native	
Holocarpha virgata (A. Gray) D. D. Keck	ASTERACEAE		native	
Holocarpha virgata (A. Gray) D. D. Keck subsp. elongata D. D. Keck	ASTERACEAE	GRACEFUL TARPLANT	native	
Holocarpha virgata (A. Gray) D. D. Keck subsp. virgata	ASTERACEAE		native	
Holodiscus discolor (Pursh) Maxim.	ROSACEAE	OCEANSPRAY	native	
Holodiscus discolor (Pursh) Maxim. var. discolor	ROSACEAE		native	
Holodiscus discolor (Pursh) Maxim. var. glabrescens (Greenm.) Jeps	ROSACEAE		native	
Holodiscus discolor (Pursh) Maxim. var. microphyllus (Rydb.) Jeps.	ROSACEAE		native	
Holodiscus dumosus (Nutt. ex Hook.) A. Heller var. cedrorum Raiche & Reveal	ROSACEAE		native	acceptance uncertain
Holosteum umbellatum L.	CARYOPHYLLACEAE		naturalized	
Holosteum umbellatum L. subsp. umbellatum	CARYOPHYLLACEAE		naturalized	
Holozonia filipes (Hook. & Arn.) Greene	ASTERACEAE	WHITECROWN	native	
Hordeum arizonicum Covas	POACEAE	ARIZONA BARLEY	native	
Hordeum brachyantherum Nevski	POACEAE		native	
Hordeum brachyantherum Nevski subsp. brachyantherum	POACEAE	NORTHERN BARLEY	native	
Hordeum brachyantherum Nevski subsp. californicum (Covas & Stebbins) Bothmer, N. Jacobsen & Seberg	POACEAE	CALIFORNIA BARLEY	native	
Hordeum depressum (Scribn. & J. G. Sm.) Rydb.	POACEAE	ALKALI BARLEY	native	
Hordeum intercedens Nevski	POACEAE	BOBTAIL BARLEY	native	
Hordeum jubatum L.	POACEAE		native	
Hordeum jubatum L. subsp. jubatum	POACEAE	SQUIRRELTAIL BARLEY	native	
Hordeum marinum Huds.	POACEAE		naturalized	
Hordeum marinum Huds. subsp. gussoneanum (Parl.) Thell.	POACEAE	MEDITERRANEAN BARLEY	naturalized	
Hordeum murinum L.	POACEAE	WALL BARLEY	naturalized	
Hordeum murinum L. subsp. glaucum (Steud.) Tzvelev	POACEAE	SMOOTH BARLEY	naturalized	
Hordeum murinum L. subsp. leporinum (Link) Arcang.	POACEAE	HARE BARLEY	naturalized	
Hordeum murinum L. subsp. murinum	POACEAE		naturalized	
Horkelia bolanderi A. Gray	ROSACEAE	BOLANDER'S HORKELIA	native	
Horkelia californica Cham. & Schltdl.	ROSACEAE		native	
Horkelia californica Cham. & Schltdl. var. californica	ROSACEAE		native	
Horkelia californica Cham. & Schltdl. var. elata (Greene) Ertter & Reveal	ROSACEAE		native	
Horkelia californica Cham. & Schltdl. var. frondosa (Greene) Ertter & Reveal	ROSACEAE		native	
Horkelia clevelandii (Greene) Rydb.	ROSACEAE		native	
Horkelia clevelandii (Greene) Rydb. var. clevelandii	ROSACEAE		native	
Horkelia congesta Hook.	ROSACEAE		native	
Horkelia congesta Hook. var. nemorosa (D. D. Keck) M. Peck	ROSACEAE	JOSEPHINE HORKELIA	native	
Horkelia cuneata Lindl.	ROSACEAE		native	
Horkelia cuneata Lindl. var. cuneata	ROSACEAE		native	
Horkelia cuneata Lindl. var. puberula (Rydb.) Ertter & Reveal	ROSACEAE	MESA HORKELIA	native	
Horkelia cuneata Lindl. var. sericea (A. Gray) Ertter & Reveal	ROSACEAE	KELLOGG'S HORKELIA	native	
Horkelia daucifolia (Greene) Rydb.	ROSACEAE		native	
Horkelia daucifolia (Greene) Rydb. var. daucifolia	ROSACEAE		native	
Horkelia daucifolia (Greene) Rydb. var. indicta (Jeps.) Ertter & Reveal	ROSACEAE	JEPSON'S HORKELIA	native	
Horkelia fusca Lindl.	ROSACEAE		native	
Horkelia fusca Lindl. var. brownii (Rydb.) Ertter & Reveal	ROSACEAE		native	
Horkelia fusca Lindl. var. parviflora Nutt. ex Hook. & Arn.) Wawra	ROSACEAE		native	
Horkelia fusca Lindl. var. pseudocapitata (Rydb. ex Howell) M. Peck	ROSACEAE		native	
Horkelia fusca Lindl. var. tenella S. Watson	ROSACEAE		native	
Horkelia hendersonii Howell	ROSACEAE	HENDERSON'S HORKELIA	native	
Horkelia hispidula Rydb.	ROSACEAE	WHITE MOUNTAINS HORKELIA	native	
Horkelia howellii (Greene) Rydb.	ROSACEAE	HOWELL'S HORKELIA	native	
Horkelia marinensis (Elmer) Crum in D.D. Keck	ROSACEAE	POINT REYES HORKELIA	native	
Horkelia parryi Greene	ROSACEAE	PARRY'S HORKELIA	native	
Horkelia rydbergii Elmer	ROSACEAE		native	
Horkelia sericata S. Watson	ROSACEAE	SILKY HORKELIA	native	
Horkelia tenuiloba (Torr.) A. Gray	ROSACEAE	THIN-LOBED HORKELIA	native	
Horkelia tridentata Torr.	ROSACEAE		native	
Horkelia tridentata Torr. var. flavescens (Rydb.) Ertter & Reveal	ROSACEAE		native	
Horkelia tridentata Torr. var. tridentata	ROSACEAE		native	
Horkelia truncata Rydb.	ROSACEAE	RAMONA HORKELIA	native	
Horkelia tularensis (J. T. Howell) Munz	ROSACEAE	KERN PLATEAU HORKELIA	native	
Horkelia wilderae Parish	ROSACEAE	BARTON FLATS HORKELIA	native	
Horkelia yadonii Ertter	ROSACEAE	SANTA LUCIA HORKELIA	native	
Horkeliella congdonis (Rydb.) Rydb.	ROSACEAE		native	
Horkeliella purpurascens (S. Watson) Rydb.	ROSACEAE		native	
Hornungia procumbens (L.) Hayek	BRASSICACEAE		naturalized	
Horsfordia alata (S. Watson) A. Gray	MALVACEAE	PINK VELVET-MALLOW	native	
Horsfordia newberryi (S. Watson) A. Gray	MALVACEAE	NEWBERRY'S VELVET-MALLOW	native	
Hosackia crassifolia Benth.	FABACEAE		native	
Hosackia crassifolia Benth. var. crassifolia	FABACEAE		native	
Hosackia crassifolia Benth. var. otayensis (Moran ex Isely) Brouillet	FABACEAE	OTAY MOUNTAIN HOSACKIA	native	
Hosackia gracilis Benth.	FABACEAE	HARLEQUIN LOTUS	native	
Hosackia incana Torr.	FABACEAE		native	
Hosackia oblongifolia Benth.	FABACEAE		native	
Hosackia oblongifolia Benth. var. cuprea (Greene) Brouillet	FABACEAE	COPPER-FLOWERED BIRD'S-FOOT TREFOIL	native	
Hosackia oblongifolia Benth. var. oblongifolia	FABACEAE		native	
Hosackia pinnata (Hook.) Abrams	FABACEAE		native	
Hosackia rosea Eastw.	FABACEAE		native	
Hosackia stipularis Benth.	FABACEAE		native	
Hosackia stipularis Benth. var. ottleyi (Isely) Brouillet	FABACEAE		native	
Hosackia stipularis Benth. var. stipularis	FABACEAE		native	
Hosackia yollabolliensis (Munz) D.D. Sokoloff	FABACEAE	YOLLA BOLLY MOUNTAINS BIRD'S-FOOT TREFOIL	native	
Howellia aquatilis A. Gray	CAMPANULACEAE	WATER HOWELLIA	native	
Hulsea algida A. Gray	ASTERACEAE		native	
Hulsea brevifolia A. Gray	ASTERACEAE	SHORTLEAVED HULSEA	native	
Hulsea californica Torr. & A. Gray	ASTERACEAE	SAN DIEGO SUNFLOWER	native	
Hulsea heterochroma A. Gray	ASTERACEAE		native	
Hulsea mexicana Rydb.	ASTERACEAE	MEXICAN HULSEA	native	
Hulsea nana A. Gray	ASTERACEAE	LITTLE HULSEA	native	
Hulsea vestita A. Gray	ASTERACEAE		native	
Hulsea vestita A. Gray subsp. callicarpha (H. M. Hall) Wilken	ASTERACEAE	BEAUTIFUL HULSEA	native	
Hulsea vestita A. Gray subsp. gabrielensis Wilken	ASTERACEAE	SAN GABRIEL MOUNTAINS SUNFLOWER	native	
Hulsea vestita A. Gray subsp. inyoensis (D. D. Keck) Wilken	ASTERACEAE	INYO HULSEA	native	
Hulsea vestita A. Gray subsp. parryi (A. Gray) Wilken	ASTERACEAE	PARRY'S SUNFLOWER	native	
Hulsea vestita A. Gray subsp. pygmaea (A. Gray) Wilken	ASTERACEAE	PYGMY HULSEA	native	
Hulsea vestita A. Gray subsp. vestita	ASTERACEAE		native	
Humulus americanus Nutt.	CANNABACEAE		naturalized	acceptance uncertain
Humulus lupulus L.	CANNABACEAE	EUROPEAN HOP	naturalized	
Hydrilla verticillata (L. f.) Royle	HYDROCHARITACEAE		naturalized	
Hydrocotyle ranunculoides L. f.	ARALIACEAE		native	
Hydrocotyle umbellata L.	ARALIACEAE		native	
Hydrocotyle verticillata Thunb.	ARALIACEAE		native	
Hydrophyllum capitatum Douglas ex Benth.	BORAGINACEAE		native	
Hydrophyllum capitatum Douglas ex Benth. var. alpinum S. Watson	BORAGINACEAE	WOOLEN-BREECHES	native	
Hydrophyllum fendleri (A. Gray) A. Heller	BORAGINACEAE		native	
Hydrophyllum fendleri (A. Gray) A. Heller var. albifrons (A. Heller) J. F. Macbr.	BORAGINACEAE		native	
Hydrophyllum occidentale (S. Watson) A. Gray	BORAGINACEAE		native	
Hydrophyllum tenuipes A. Heller	BORAGINACEAE		native	
Hymenopappus filifolius Hook.	ASTERACEAE		native	
Hymenopappus filifolius Hook. var. eriopodus (A. Nelson) B. L. Turner	ASTERACEAE	HAIRY-PODDED FINE-LEAF HYMENOPAPPUS	native	
Hymenopappus filifolius Hook. var. lugens (Greene) Jeps.	ASTERACEAE		native	
Hymenopappus filifolius Hook. var. megacephalus B. L. Turner	ASTERACEAE		native	
Hymenopappus filifolius Hook. var. nanus (Rydb.) B. L. Turner	ASTERACEAE	LITTLE CUTLEAF	native	
Hymenothrix wrightii A. Gray	ASTERACEAE	WRIGHT'S HYMENOTHRIX	native	
Hymenoxys cooperi (A. Gray) Cockerell	ASTERACEAE		native	
Hymenoxys hoopesii (A. Gray) Bierner	ASTERACEAE		native	
Hymenoxys lemmonii (Greene) Cockerell	ASTERACEAE	ALKALI HYMENOXYS	native	
Hymenoxys odorata DC.	ASTERACEAE	BITTER HYMENOXYS	native	
Hyparrhenia hirta (L.) Stapf	POACEAE	THATCHING GRASS	naturalized	
Hypericum anagalloides Cham. & Schltdl.	HYPERICACEAE	TINKER'S PENNY	native	
Hypericum calycinum L.	HYPERICACEAE	AARON'S BEARD	naturalized	
Hypericum canariense L.	HYPERICACEAE		naturalized	
Hypericum concinnum Benth.	HYPERICACEAE	GOLD-WIRE	native	
Hypericum mutilum L.	HYPERICACEAE		naturalized	
Hypericum mutilum L. subsp. mutilum	HYPERICACEAE		naturalized	
Hypericum perforatum L.	HYPERICACEAE		naturalized	
Hypericum perforatum L. subsp. perforatum	HYPERICACEAE	KLAMATHWEED	naturalized	
Hypericum scouleri Hook.	HYPERICACEAE		native	
Hypochaeris glabra L.	ASTERACEAE	SMOOTH CAT'S-EAR	naturalized	
Hypochaeris radicata L.	ASTERACEAE	ROUGH CAT'S-EAR	naturalized	
Idahoa scapigera (Hook.) A. Nelson & J. F. Macbr.	BRASSICACEAE		native	
Ilex aquifolium L.	AQUIFOLIACEAE	ENGLISH HOLLY	naturalized	
Iliamna bakeri (Jeps.) Wiggins	MALVACEAE	BAKER'S GLOBE MALLOW	native	
Iliamna latibracteata Wiggins	MALVACEAE	CALIFORNIA GLOBE MALLOW	native	
Iliamna rivularis (Hook.) Greene	MALVACEAE	STREAMBANK WILD HOLLYHOCK	native	
Impatiens balfourii Hook. f.	BALSAMINACEAE	KASHMIR BALSAM	naturalized	
Impatiens glandulifera Royle	BALSAMINACEAE	POLICEMAN'S HELMET	naturalized	
Imperata brevifolia Vasey	POACEAE	CALIFORNIA SATINTAIL	native	
Inula helenium L.	ASTERACEAE		naturalized	acceptance uncertain
Ionactis alpina (Nutt.) Greene	ASTERACEAE	CRAG-ASTER	native	
Ipheion uniflorum (Graham) Raf.	ALLIACEAE		naturalized	
Ipomopsis aggregata (Pursh) V. E. Grant	POLEMONIACEAE		native	
Ipomopsis aggregata (Pursh) V. E. Grant subsp. aggregata	POLEMONIACEAE		native	
Ipomopsis aggregata (Pursh) V. E. Grant subsp. bridgesii (A. Gray) V. E. Grant & A. D. Grant	POLEMONIACEAE		native	
Ipomopsis arizonica (Greene) Wherry	POLEMONIACEAE		native	
Ipomopsis congesta (Hook.) V. E. Grant	POLEMONIACEAE		native	
Ipomopsis congesta (Hook.) V. E. Grant subsp. congesta	POLEMONIACEAE		native	
Ipomopsis congesta (Hook.) V. E. Grant subsp. montana (A. Nelson & P. B. Kenn.) V. E. Grant	POLEMONIACEAE		native	
Ipomopsis polycladon (Torr.) V. E. Grant	POLEMONIACEAE		native	
Ipomopsis tenuifolia (A. Gray) V. E. Grant	POLEMONIACEAE	SLENDER-LEAVED IPOMOPSIS	native	
Ipomopsis tenuituba (Rydb.) V. E. Grant	POLEMONIACEAE		native	
Iris bracteata S. Watson	IRIDACEAE	SISKIYOU IRIS	native	
Iris chrysophylla Howell	IRIDACEAE	YELLOW-FLOWERED IRIS	native	
Iris douglasiana Herb.	IRIDACEAE		native	
Iris fernaldii R. C. Foster	IRIDACEAE		native	
Iris foetidissima L.	IRIDACEAE	CORAL IRIS	naturalized	
Iris germanica L.	IRIDACEAE		naturalized	
Iris hartwegii Baker	IRIDACEAE		native	
Iris hartwegii Baker subsp. australis (Parish) L. W. Lenz	IRIDACEAE		native	
Iris hartwegii Baker subsp. columbiana L. W. Lenz	IRIDACEAE	TUOLUMNE IRIS	native	
Iris hartwegii Baker subsp. hartwegii	IRIDACEAE		native	
Iris hartwegii Baker subsp. pinetorum (Eastw.) L. W. Lenz	IRIDACEAE		native	
Iris innominata L. F. Hend.	IRIDACEAE	DEL NORTE COUNTY IRIS	native	
Iris longipetala Herb.	IRIDACEAE	COAST IRIS	native	
Iris macrosiphon Torr.	IRIDACEAE		native	
Iris missouriensis Nutt.	IRIDACEAE	WESTERN BLUE FLAG	native	
Iris munzii R. C. Foster	IRIDACEAE	MUNZ'S IRIS	native	
Iris pseudacorus L.	IRIDACEAE		naturalized	
Iris purdyi Eastw.	IRIDACEAE		native	
Iris tenax Douglas ex Lindl.	IRIDACEAE		native	
Iris tenax Douglas ex Lindl. subsp. klamathensis L. W. Lenz	IRIDACEAE	ORLEANS IRIS	native	
Iris tenuissima Dykes	IRIDACEAE		native	
Iris tenuissima Dykes subsp. purdyiformis (R. C. Foster) L. W. Lenz	IRIDACEAE		native	
Iris tenuissima Dykes subsp. tenuissima	IRIDACEAE		native	
Iris thompsonii R. C. Foster	IRIDACEAE		native	
Isatis tinctoria L.	BRASSICACEAE	WOAD	naturalized	
Isocoma acradenia (Greene) Greene	ASTERACEAE	ALKALI GOLDENBUSH	native	
Isocoma acradenia (Greene) Greene var. acradenia	ASTERACEAE		native	
Isocoma acradenia (Greene) Greene var. bracteosa (Greene) G. L. Nesom	ASTERACEAE		native	
Isocoma acradenia (Greene) Greene var. eremophila (Greene) G. L. Nesom	ASTERACEAE		native	
Isocoma arguta Greene	ASTERACEAE	CARQUINEZ GOLDENBUSH	native	
Isocoma menziesii (Hook. & Arn.) G. L. Nesom	ASTERACEAE	COASTAL GOLDENBUSH	native	
Isocoma menziesii (Hook. & Arn.) G. L. Nesom var. decumbens (Greene) G. L. Nesom	ASTERACEAE	DECUMBENT GOLDENBUSH	native	
Isocoma menziesii (Hook. & Arn.) G. L. Nesom var. diabolica G. L. Nesom	ASTERACEAE	SATAN'S GOLDENBUSH	native	
Isocoma menziesii (Hook. & Arn.) G. L. Nesom var. menziesii	ASTERACEAE		native	
Isocoma menziesii (Hook. & Arn.) G. L. Nesom var. sedoides (Greene) G. L. Nesom	ASTERACEAE		native	
Isocoma menziesii (Hook. & Arn.) G. L. Nesom var. vernonioides (Nutt.) G. L. Nesom	ASTERACEAE		native	
Isoetes bolanderi Engelm.	ISOETACEAE		native	
Isoetes echinospora Durieu	ISOETACEAE		native	
Isoetes howellii Engelm.	ISOETACEAE		native	
Isoetes nuttallii A. Braun ex Engelm.	ISOETACEAE		native	
Isoetes occidentalis L. F. Hend.	ISOETACEAE		native	
Isoetes orcuttii A. A. Eaton	ISOETACEAE		native	
Isolepis carinata Hook. & Arn. ex Torr.	CYPERACEAE		native	
Isolepis cernua (Vahl) Roem. & Schult.	CYPERACEAE		native	
Isolepis levynsiana Muasya & D.A. Simpson	CYPERACEAE		naturalized	
Isolepis setacea (L.) R. Br.	CYPERACEAE		naturalized	
Isomeris arborea Nutt.	CLEOMACEAE		native	
Iva axillaris Pursh	ASTERACEAE	POVERTY WEED	native	
Iva hayesiana A. Gray	ASTERACEAE	SAN DIEGO MARSH-ELDER	native	
Ivesia aperta (J. T. Howell) Munz	ROSACEAE		native	
Ivesia aperta (J. T. Howell) Munz var. aperta	ROSACEAE	SIERRA VALLEY IVESIA	native	
Ivesia aperta (J. T. Howell) Munz var. canina Ertter	ROSACEAE	DOG VALLEY IVESIA	native	
Ivesia argyrocoma (Rydb.) Rydb.	ROSACEAE		native	
Ivesia argyrocoma (Rydb.) Rydb. var. argyrocoma	ROSACEAE	SILVER-HAIRED IVESIA	native	
Ivesia arizonica (J. T. Howell) Ertter	ROSACEAE		native	
Ivesia arizonica (J. T. Howell) Ertter var. arizonica	ROSACEAE	YELLOW PURPUSIA	native	
Ivesia baileyi S. Watson	ROSACEAE		native	
Ivesia baileyi S. Watson var. baileyi	ROSACEAE	BAILEY'S IVESIA	native	
Ivesia baileyi S. Watson var. beneolens (A. Nelson & J. F. Macbr.) Ertter	ROSACEAE	OWYHEE IVESIA	native	
Ivesia callida (H. M. Hall) Rydb.	ROSACEAE	TAHQUITZ IVESIA	native	
Ivesia campestris (M. E. Jones) Rydb.	ROSACEAE	FIELD IVESIA	native	
Ivesia gordonii (Hook.) Torr. & A. Gray	ROSACEAE		native	
Ivesia gordonii (Hook.) Torr. & A. Gray var. alpicola (Rydb. ex Howell) Ertter & Reveal	ROSACEAE		native	
Ivesia gordonii (Hook.) Torr. & A. Gray var. ursinorum (Jepson) Ertter & Reveal	ROSACEAE		native	
Ivesia jaegeri Munz & I. M. Johnst.	ROSACEAE	JAEGER'S IVESIA	native	
Ivesia kingii S. Watson	ROSACEAE		native	
Ivesia kingii S. Watson var. kingii	ROSACEAE	ALKALI IVESIA	native	
Ivesia longibracteata Ertter	ROSACEAE	CASTLE CRAGS IVESIA	native	
Ivesia lycopodioides A. Gray	ROSACEAE	CLUB-MOSS IVESIA	native	
Ivesia lycopodioides A. Gray var. lycopodioides	ROSACEAE		native	
Ivesia lycopodioides A. Gray var. megalopetala (Rydb.) Ertter & Reveal	ROSACEAE		native	
Ivesia lycopodioides A. Gray var. scandularis (Rydb.) Ertter & Reveal	ROSACEAE		native	
Ivesia muirii A. Gray	ROSACEAE		native	
Ivesia paniculata T. W. Nelson & J. P. Nelson	ROSACEAE	ASH CREEK IVESIA	native	
Ivesia patellifera (J. T. Howell) Ertter	ROSACEAE	KINGSTON MOUNTAINS IVESIA	native	
Ivesia pickeringii Torr. ex A. Gray	ROSACEAE	PICKERING'S IVESIA	native	
Ivesia pygmaea A. Gray	ROSACEAE		native	
Ivesia santolinoides A. Gray	ROSACEAE	MOUSETAIL IVESIA	native	
Ivesia saxosa (Greene) Ertter	ROSACEAE		native	
Ivesia sericoleuca (Rydb.) Rydb.	ROSACEAE	PLUMAS IVESIA	native	
Ivesia shockleyi S. Watson	ROSACEAE		native	
Ivesia shockleyi S. Watson var. shockleyi	ROSACEAE		native	
Ivesia unguiculata A. Gray	ROSACEAE	YOSEMITE IVESIA	native	
Ivesia webberi A. Gray	ROSACEAE	WEBBER'S IVESIA	native	
Jamesia americana Torr. & A. Gray	HYDRANGEACEAE		native	
Jamesia americana Torr. & A. Gray var. rosea Purpus ex C. K. Schneid.	HYDRANGEACEAE	ROSY-PETALLED CLIFFBUSH	native	
Jaumea carnosa (Less.) A. Gray	ASTERACEAE		native	
Jensia rammii (Greene) B. G. Baldwin	ASTERACEAE		native	
Jensia yosemitana (A. Gray) B. G. Baldwin	ASTERACEAE	YOSEMITE TARPLANT	native	
Jepsonia heterandra Eastw.	SAXIFRAGACEAE	FOOTHILL JEPSONIA	native	
Jepsonia malvifolia (Greene) Small	SAXIFRAGACEAE	ISLAND JEPSONIA	native	
Jepsonia parryi (Torr.) Small	SAXIFRAGACEAE		native	
Johanneshowellia puberula (S. Watson) Reveal	POLYGONACEAE	DOWNY BUCKWHEAT	native	
Juglans californica S. Watson	JUGLANDACEAE	SOUTHERN CALIFORNIA BLACK WALNUT	native	
Juglans hindsii Jeps. ex R. E. Sm.	JUGLANDACEAE	NORTHERN CALIFORNIA BLACK WALNUT	native	
Juncus acuminatus Michx.	JUNCACEAE	TAPERED RUSH	native	
Juncus acutus L.	JUNCACEAE		native	
Juncus acutus L. subsp. leopoldii (Parl.) Snogerup	JUNCACEAE	SOUTHWESTERN SPINY RUSH	native	
Juncus ambiguus Guss.	JUNCACEAE	FROG RUSH	naturalized	
Juncus articulatus L.	JUNCACEAE		native	
Juncus articulatus L. subsp. articulatus	JUNCACEAE	JOINTED RUSH	native	
Juncus balticus Willd.	JUNCACEAE		native	
Juncus balticus Willd. subsp. ater (Rydb.) Snogerup	JUNCACEAE	BALTIC RUSH	native	
Juncus bolanderi Engelm.	JUNCACEAE	BOLANDER'S RUSH	native	
Juncus brachyphyllus Wiegand	JUNCACEAE	SHORTLEAVED RUSH	native	
Juncus breweri Engelm.	JUNCACEAE	BREWER'S RUSH	native	
Juncus bryoides F. J. Herm.	JUNCACEAE	MOSS RUSH	native	
Juncus bufonius L.	JUNCACEAE	TOAD RUSH	native	
Juncus bufonius L. var. bufonius	JUNCACEAE		native	
Juncus bufonius L. var. congestus Wahlb.	JUNCACEAE	CLUSTERED TOAD RUSH	naturalized	
Juncus bufonius L. var. occidentalis F. J. Herm.	JUNCACEAE	WESTERN TOAD RUSH	native	
Juncus bulbosus L.	JUNCACEAE		naturalized	
Juncus capillaris F. J. Herm.	JUNCACEAE	HAIRSTEMMED RUSH	native	
Juncus capitatus Weigel	JUNCACEAE	DWARF RUSH	naturalized	
Juncus chlorocephalus Engelm.	JUNCACEAE	GREENHEADED RUSH	native	
Juncus confusus Coville	JUNCACEAE	COLORADO RUSH	native	
Juncus cooperi Engelm.	JUNCACEAE	COOPER'S RUSH	native	
Juncus covillei Piper	JUNCACEAE	COVILLE'S RUSH	native	
Juncus cyperoides Laharpe	JUNCACEAE	BOLIVIAN RUSH	naturalized	
Juncus dichotomus Elliott	JUNCACEAE		naturalized	
Juncus diffusissimus Buckley	JUNCACEAE	SLIM-POD RUSH	naturalized	
Juncus digitatus C. W. Witham & Zika	JUNCACEAE	FINGER RUSH	native	
Juncus drummondii E. Mey.	JUNCACEAE	DRUMMOND'S RUSH	native	
Juncus dubius Engelm.	JUNCACEAE	MARIPOSA RUSH	native	
Juncus dudleyi Wiegand	JUNCACEAE	DUDLEY'S RUSH	native	
Juncus duranii Ewan	JUNCACEAE	DURAN'S RUSH	native	
Juncus effusus L.	JUNCACEAE	LAMP RUSH	native	
Juncus effusus L. subsp. austrocalifornicus Lint ex Zika	JUNCACEAE	BAJA RUSH	native	
Juncus effusus L. subsp. effusus	JUNCACEAE	COMMON RUSH	naturalized	
Juncus effusus L. subsp. pacificus (Fernald & Wiegand) Piper & Beattie	JUNCACEAE	PACIFIC RUSH	native	
Juncus effusus L. subsp. solutus (Fernald & Wiegand) Hämet-Ahti	JUNCACEAE	EASTERN SOFT RUSH	naturalized	
Juncus elliottii Chapm.	JUNCACEAE		naturalized	
Juncus ensifolius Wikstr.	JUNCACEAE	SWORDLEAVED RUSH	native	
Juncus exiguus (Fernald & Wiegand) Lint ex Snogerup & Zika	JUNCACEAE	WEAK RUSH	native	
Juncus falcatus E. Mey.	JUNCACEAE		native	
Juncus falcatus E. Mey. subsp. falcatus	JUNCACEAE	SICKLELEAVED RUSH	native	
Juncus falcatus E. Mey. subsp. sitchensis (Buchenau) Hultén	JUNCACEAE	ALASKAN SICKLELEAVED RUSH	native	
Juncus gerardii Loisel.	JUNCACEAE		naturalized	
Juncus gerardii Loisel. subsp. gerardii	JUNCACEAE	MUD RUSH	naturalized	
Juncus hemiendytus F. J. Herm.	JUNCACEAE		native	
Juncus hemiendytus F. J. Herm. var. abjectus (F. J. Herm.) Ertter	JUNCACEAE	CENTER BASIN RUSH	native	
Juncus hemiendytus F. J. Herm. var. hemiendytus	JUNCACEAE	HERMANN'S DWARF RUSH	native	
Juncus hesperius (Piper) Lint	JUNCACEAE	BOG RUSH	native	
Juncus howellii F. J. Herm.	JUNCACEAE	HOWELL'S RUSH	native	
Juncus interior Wiegand	JUNCACEAE	INLAND RUSH	native	
Juncus kelloggii Engelm.	JUNCACEAE	KELLOGG'S DWARF RUSH	native	
Juncus laccatus Zika	JUNCACEAE	SHINY RUSH	native	
Juncus leiospermus F. J. Herm.	JUNCACEAE		native	
Juncus leiospermus F. J. Herm. var. ahartii Ertter	JUNCACEAE	AHART'S DWARF RUSH	native	
Juncus leiospermus F. J. Herm. var. leiospermus	JUNCACEAE	RED BLUFF DWARF RUSH	native	
Juncus lescurii Bol.	JUNCACEAE	SAN FRANCISCO RUSH	native	
Juncus longistylis Torr.	JUNCACEAE	LONG-STYLED RUSH	native	
Juncus luciensis Ertter	JUNCACEAE	SANTA LUCIA DWARF RUSH	native	
Juncus macrandrus Coville	JUNCACEAE	LONG-ANTHERED RUSH	native	
Juncus macrophyllus Coville	JUNCACEAE	LONG-LEAVED RUSH	native	
Juncus marginatus Rostk.	JUNCACEAE	RED-ANTHERED RUSH	naturalized	
Juncus mertensianus Bong.	JUNCACEAE	MERTENS' RUSH	native	
Juncus mexicanus Willd.	JUNCACEAE	MEXICAN RUSH	native	
Juncus nevadensis S. Watson	JUNCACEAE		native	
Juncus nevadensis S. Watson var. inventus (L.F. Hend.) C.L. Hitchc.	JUNCACEAE	DUNE RUSH	native	
Juncus nevadensis S. Watson var. nevadensis	JUNCACEAE	SIERRAN RUSH	native	
Juncus nodosus L.	JUNCACEAE	KNOTTED RUSH	native	
Juncus occidentalis (Coville) Wiegand	JUNCACEAE	WESTERN RUSH	native	
Juncus orthophyllus Coville	JUNCACEAE	STRAIGHTLEAVED RUSH	native	
Juncus oxymeris Engelm.	JUNCACEAE	POINTED RUSH	native	
Juncus parryi Engelm.	JUNCACEAE	PARRY'S RUSH	native	
Juncus patens E. Mey.	JUNCACEAE	SPREADING RUSH	native	
Juncus phaeocephalus Engelm.	JUNCACEAE		native	
Juncus phaeocephalus Engelm. var. paniculatus Engelm.	JUNCACEAE	PANICLED RUSH	native	
Juncus phaeocephalus Engelm. var. phaeocephalus	JUNCACEAE	BROWNHEADED RUSH	native	
Juncus planifolius R. Br.	JUNCACEAE	FLAT-LEAVED RUSH	naturalized	
Juncus regelii Buchenau	JUNCACEAE	REGEL'S RUSH	native	
Juncus rugulosus Engelm.	JUNCACEAE	WRINKLED RUSH	native	
Juncus saximontanus A. Nelson	JUNCACEAE	ROCKY MOUNTAIN RUSH	native	
Juncus supiniformis Engelm.	JUNCACEAE	HAIR-LEAVED RUSH	native	
Juncus tenuis Willd.	JUNCACEAE	SLENDER RUSH	native	
Juncus textilis Buchenau	JUNCACEAE	BASKET RUSH	native	
Juncus tiehmii Ertter	JUNCACEAE	TIEHM'S RUSH	native	
Juncus torreyi Coville	JUNCACEAE	TORREY'S RUSH	native	
Juncus triformis Engelm.	JUNCACEAE	YOSEMITE DWARF RUSH	native	
Juncus uncialis Greene	JUNCACEAE	INCH-HIGH RUSH	native	
Juncus usitatus L. A. S. Johnson	JUNCACEAE	AUSTRALIAN RUSH	naturalized	
Juncus xiphioides E. Mey.	JUNCACEAE	IRIS-LEAVED RUSH	native	
Juniperus californica Carrière	CUPRESSACEAE	CALIFORNIA JUNIPER	native	
Juniperus communis L.	CUPRESSACEAE	COMMON JUNIPER	native	
Juniperus communis L. var. depressa Pursh	CUPRESSACEAE	DEPRESSED JUNIPER	native	
Juniperus communis L. var. jackii Rehder	CUPRESSACEAE	JACK'S JUNIPER	native	
Juniperus communis L. var. saxatilis Pall.	CUPRESSACEAE	MOUNTAIN JUNIPER	native	
Juniperus grandis R. P. Adams	CUPRESSACEAE	GRAND JUNIPER	native	
Juniperus occidentalis Hook.	CUPRESSACEAE	WESTERN JUNIPER	native	
Juniperus osteosperma (Torr.) Little	CUPRESSACEAE	UTAH JUNIPER	native	
Justicia californica (Benth.) D. N. Gibson	ACANTHACEAE	CHUPAROSA	native	
Kallstroemia californica (S. Watson) Vail	ZYGOPHYLLACEAE		native	
Kallstroemia grandiflora Torr. ex A. Gray	ZYGOPHYLLACEAE		naturalized	
Kallstroemia parviflora Norton	ZYGOPHYLLACEAE		naturalized	
Kalmia polifolia Wangenh.	ERICACEAE	BOX LAUREL	native	
Keckiella antirrhinoides (Benth.) Straw	PLANTAGINACEAE		native	
Keckiella antirrhinoides (Benth.) Straw var. antirrhinoides	PLANTAGINACEAE		native	
Keckiella antirrhinoides (Benth.) Straw var. microphylla (A. Gray) N. H. Holmgren	PLANTAGINACEAE		native	
Keckiella breviflora (Lindl.) Straw	PLANTAGINACEAE		native	
Keckiella breviflora (Lindl.) Straw var. breviflora	PLANTAGINACEAE		native	
Keckiella breviflora (Lindl.) Straw var. glabrisepala (D. D. Keck) N. H. Holmgren	PLANTAGINACEAE		native	
Keckiella cordifolia (Benth.) Straw	PLANTAGINACEAE		native	
Keckiella corymbosa (Benth. ex A. DC.) Straw	PLANTAGINACEAE		native	
Keckiella lemmonii (A. Gray) Straw	PLANTAGINACEAE		native	
Keckiella rothrockii (A. Gray) Straw	PLANTAGINACEAE		native	
Keckiella rothrockii (A. Gray) Straw var. jacintensis (Abrams) N. H. Holmgren	PLANTAGINACEAE		native	
Keckiella rothrockii (A. Gray) Straw var. rothrockii	PLANTAGINACEAE		native	
Keckiella ternata (Torr. ex A. Gray) Straw	PLANTAGINACEAE		native	
Keckiella ternata (Torr. ex A. Gray) Straw var. septentrionalis (Munz & I. M. Johnst.) N. H. Holmgren	PLANTAGINACEAE		native	
Keckiella ternata (Torr. ex A. Gray) Straw var. ternata	PLANTAGINACEAE		native	
Kelloggia galioides Torr.	RUBIACEAE		native	
Kickxia elatine (L.) Dumort.	PLANTAGINACEAE		naturalized	
Kickxia spuria (L.) Dumort.	PLANTAGINACEAE		naturalized	
Kniphofia uvaria (L.) Oken	ASPHODELACEAE		naturalized	
Kobresia myosuroides (Vill.) Fiori & Paol.	CYPERACEAE	SEEP KOBRESIA	native	
Kochia americana S. Watson	CHENOPODIACEAE		native	
Kochia californica S. Watson	CHENOPODIACEAE		native	
Kochia scoparia (L.) Schrad.	CHENOPODIACEAE		naturalized	
Kochia scoparia (L.) Schrad. subsp. scoparia	CHENOPODIACEAE		naturalized	
Koeberlinia spinosa Zucc.	KOEBERLINIACEAE		native	
Koeberlinia spinosa Zucc. var. tenuispina Kearney & Peebles	KOEBERLINIACEAE	SLENDER-SPINED ALL THORN	native	
Koeleria gerardii (Vill.) Shinners	POACEAE	BRISTLY KOELERIA	naturalized	
Koeleria macrantha (Ledeb.) Schult.	POACEAE	JUNE GRASS	native	
Koelreuteria elegans (Seem.) A.C. Sm.	SAPINDACEAE		naturalized	acceptance uncertain
Kopsiopsis hookeri (Walp.) Govaerts	OROBANCHACEAE	SMALL GROUND-CONE	native	
Kopsiopsis strobilacea (A. Gray) Beck	OROBANCHACEAE	CALIFORNIA GROUND-CONE	native	
Krameria bicolor S. Watson	KRAMERIACEAE	WHITE RHATANY	native	
Krameria erecta Schult.	KRAMERIACEAE	LITTLE-LEAVED RHATANY	native	
Krascheninnikovia lanata (Pursh) A. Meeuse & A. Smit	CHENOPODIACEAE	WINTER FAT	native	
Kyhosia bolanderi (A. Gray) B. G. Baldwin	ASTERACEAE		native	
Kyllinga brevifolia Rottb.	CYPERACEAE		naturalized	
Lactuca biennis (Moench) Fernald	ASTERACEAE		native	
Lactuca canadensis L.	ASTERACEAE		naturalized	
Lactuca ludoviciana (Nutt.) Riddell	ASTERACEAE		naturalized	
Lactuca saligna L.	ASTERACEAE		naturalized	
Lactuca serriola L.	ASTERACEAE	PRICKLY LETTUCE	naturalized	
Lactuca tatarica (L.) C. A. Mey.	ASTERACEAE		native	
Lactuca tatarica (L.) C. A. Mey. subsp. pulchella Stebbins	ASTERACEAE		native	
Lactuca virosa L.	ASTERACEAE		naturalized	
Ladeania lanceolata (Pursh) A. N. Egan & Reveal	FABACEAE		native	
Laennecia coulteri (A. Gray) G. L. Nesom	ASTERACEAE	COULTER'S HORSEWEED	native	
Lagophylla dichotoma Benth.	ASTERACEAE		native	
Lagophylla glandulosa A. Gray	ASTERACEAE		native	
Lagophylla minor (D. D. Keck) D. D. Keck	ASTERACEAE		native	
Lagophylla ramosissima Nutt.	ASTERACEAE		native	
Lagunaria patersonia (Andrews) G. Don	MALVACEAE	COW ITCH TREE	naturalized	
Lagurus ovatus L.	POACEAE		naturalized	
Lamarckia aurea (L.) Moench	POACEAE		naturalized	
Lamium amplexicaule L.	LAMIACEAE	HENBIT	naturalized	
Lamium purpureum L.	LAMIACEAE		naturalized	
Lampranthus spectabilis N.E. Br.	AIZOACEAE		naturalized	acceptance uncertain
Landoltia punctata (G. Mey.) Les & D. J. Crawford	ARACEAE		native	
Langloisia setosissima (Torr. & A. Gray) Greene	POLEMONIACEAE		native	
Langloisia setosissima (Torr. & A. Gray) Greene subsp. punctata (Coville) Timbrook	POLEMONIACEAE	LILAC SUNBONNET	native	
Langloisia setosissima (Torr. & A. Gray) Greene subsp. setosissima	POLEMONIACEAE	BRISTLY LANGLOISIA	native	
Lappula redowskii (Hornem.) Greene	BORAGINACEAE		native	
Lappula redowskii (Hornem.) Greene var. cupulata (A. Gray) M. E. Jones	BORAGINACEAE	CROWNED STICKSEED	native	
Lappula redowskii (Hornem.) Greene var. redowskii	BORAGINACEAE	WESTERN STICKSEED	native	
Lapsana communis L.	ASTERACEAE		naturalized	
Larrea tridentata (DC.) Coville	ZYGOPHYLLACEAE		native	
Lasiospermum bipinnatum (Thunb.) Druce	ASTERACEAE		naturalized	
Lastarriaea coriacea (Goodman) Hoover	POLYGONACEAE	LEATHER-SPINEFLOWER	native	
Lasthenia burkei (Greene) Greene	ASTERACEAE	BURKE'S GOLDFIELDS	native	
Lasthenia californica DC. ex Lindl.	ASTERACEAE		native	
Lasthenia californica DC. ex Lindl. subsp. bakeri (J. T. Howell) R. Chan	ASTERACEAE	BAKER'S GOLDFIELDS	native	
Lasthenia californica DC. ex Lindl. subsp. californica	ASTERACEAE	CALIFORNIA GOLDFIELDS	native	
Lasthenia californica DC. ex Lindl. subsp. macrantha (A. Gray) R. Chan	ASTERACEAE	PERENNIAL GOLDFIELDS	native	
Lasthenia chrysantha (Greene ex A. Gray) Greene	ASTERACEAE	ALKALI-SINK GOLDFIELDS	native	
Lasthenia conjugens Greene	ASTERACEAE	CONTRA COSTA GOLDFIELDS	native	
Lasthenia coronaria (Nutt.) Ornduff	ASTERACEAE	ROYAL GOLDFIELDS	native	
Lasthenia debilis (Greene ex A. Gray) Ornduff	ASTERACEAE	GREENE'S GOLDFIELDS	native	
Lasthenia ferrisiae Ornduff	ASTERACEAE	FERRIS' GOLDFIELDS	native	
Lasthenia fremontii (Torr. ex A. Gray) Greene	ASTERACEAE	FREMONT'S GOLDFIELDS	native	
Lasthenia glaberrima DC.	ASTERACEAE	SMOOTH GOLDFIELDS	native	
Lasthenia glabrata Lindl.	ASTERACEAE		native	
Lasthenia glabrata Lindl. subsp. coulteri (A. Gray) Ornduff	ASTERACEAE	COULTER'S GOLDFIELDS	native	
Lasthenia glabrata Lindl. subsp. glabrata	ASTERACEAE	YELLOW-RAY GOLDFIELDS	native	
Lasthenia gracilis (DC.) Greene	ASTERACEAE	COMMON GOLDFIELDS	native	
Lasthenia leptalea (A. Gray) Ornduff	ASTERACEAE	SALINAS VALLEY GOLDFIELDS	native	
Lasthenia maritima (A. Gray) M. C. Vasey	ASTERACEAE	SEASIDE GOLDFIELDS	native	
Lasthenia microglossa (DC.) Greene	ASTERACEAE	SMALL-RAY GOLDFIELDS	native	
Lasthenia minor (DC.) Ornduff	ASTERACEAE	COASTAL GOLDFIELDS	native	
Lasthenia platycarpha (A. Gray) Greene	ASTERACEAE	ALKALI GOLDFIELDS	native	
Lathrocasis tenerrima (A. Gray) L.A. Johnson	POLEMONIACEAE	DELICATE GILIA	native	
Lathyrus angulatus L.	FABACEAE		naturalized	
Lathyrus biflorus T. W. Nelson & J. P. Nelson	FABACEAE	TWO-FLOWERED PEA	native	
Lathyrus brownii Eastw.	FABACEAE		native	
Lathyrus cicera L.	FABACEAE		naturalized	
Lathyrus delnorticus C. L. Hitchc.	FABACEAE	DEL NORTE PEA	native	
Lathyrus glandulosus Broich	FABACEAE	STICKY PEA	native	
Lathyrus hirsutus L.	FABACEAE	CALEY PEA	naturalized	
Lathyrus hitchcockianus Barneby & Reveal	FABACEAE	BULLFROG MOUNTAIN PEA	native	
Lathyrus japonicus Willd.	FABACEAE	SEASIDE PEA	native	
Lathyrus jepsonii Greene	FABACEAE		native	
Lathyrus jepsonii Greene var. californicus (S. Watson) Hoover	FABACEAE		native	
Lathyrus jepsonii Greene var. jepsonii	FABACEAE	DELTA TULE PEA	native	
Lathyrus lanszwertii Kellogg	FABACEAE		native	
Lathyrus lanszwertii Kellogg var. aridus (Piper) Jeps.	FABACEAE		native	
Lathyrus lanszwertii Kellogg var. lanszwertii	FABACEAE		native	
Lathyrus lanszwertii Kellogg var. tracyi (Bradshaw) Isely	FABACEAE		native	
Lathyrus latifolius L.	FABACEAE	PERENNIAL SWEET PEA	naturalized	
Lathyrus littoralis (Nutt.) Endl. ex Walp.	FABACEAE		native	
Lathyrus nevadensis S. Watson	FABACEAE		native	
Lathyrus nevadensis S. Watson var. nevadensis	FABACEAE		native	
Lathyrus odoratus L.	FABACEAE	SWEET PEA	naturalized	
Lathyrus palustris L.	FABACEAE	MARSH PEA	native	
Lathyrus polyphyllus Nutt.	FABACEAE		native	
Lathyrus rigidus T. G. White	FABACEAE	RIGID PEA	native	
Lathyrus sphaericus Retz.	FABACEAE		naturalized	
Lathyrus splendens Kellogg	FABACEAE	PRIDE-OF-CALIFORNIA	native	
Lathyrus sulphureus A. Gray	FABACEAE		native	
Lathyrus tingitanus L.	FABACEAE	TANGIER PEA	naturalized	
Lathyrus torreyi A. Gray	FABACEAE		native	
Lathyrus vestitus Nutt.	FABACEAE		native	
Lathyrus vestitus Nutt. var. alefeldii (T. G. White) Isely	FABACEAE		native	
Lathyrus vestitus Nutt. var. ochropetalus (Piper) Isely	FABACEAE		native	
Lathyrus vestitus Nutt. var. vestitus	FABACEAE		native	
Lavatera olbia L.	MALVACEAE	TREE LAVATERA	naturalized	
Layia carnosa (Nutt.) Torr. & A. Gray	ASTERACEAE	BEACH LAYIA	native	
Layia chrysanthemoides (DC.) A. Gray	ASTERACEAE		native	
Layia discoidea D. D. Keck	ASTERACEAE	RAYLESS LAYIA	native	
Layia fremontii (Torr. & A. Gray) A. Gray	ASTERACEAE		native	
Layia gaillardioides (Hook. & Arn.) DC.	ASTERACEAE		native	
Layia glandulosa (Hook.) Hook. & Arn.	ASTERACEAE	WHITE LAYIA	native	
Layia heterotricha (DC.) Hook. & Arn.	ASTERACEAE	PALE-YELLOW LAYIA	native	
Layia hieracioides (DC.) Hook. & Arn.	ASTERACEAE		native	
Layia jonesii A. Gray	ASTERACEAE	JONES' LAYIA	native	
Layia leucopappa D. D. Keck	ASTERACEAE	COMANCHE POINT LAYIA	native	
Layia munzii D. D. Keck	ASTERACEAE	MUNZ'S TIDY-TIPS	native	
Layia pentachaeta A. Gray	ASTERACEAE		native	
Layia pentachaeta A. Gray subsp. albida D. D. Keck	ASTERACEAE		native	
Layia pentachaeta A. Gray subsp. pentachaeta	ASTERACEAE		native	
Layia platyglossa (Fisch. & C. A. Mey.) A. Gray	ASTERACEAE	TIDY-TIPS	native	
Layia septentrionalis D. D. Keck	ASTERACEAE	COLUSA LAYIA	native	
Leersia oryzoides (L.) Sw.	POACEAE	RICE CUTGRASS	native	
Legenere limosa (Greene) McVaugh	CAMPANULACEAE	LEGENERE	native	
Lemna aequinoctialis Welw.	ARACEAE		native	
Lemna gibba L.	ARACEAE		native	
Lemna minor L.	ARACEAE		native	
Lemna minuta Kunth	ARACEAE		native	
Lemna trisulca L.	ARACEAE		native	
Lemna turionifera Landolt	ARACEAE		native	
Lemna valdiviana Phil.	ARACEAE		native	
Leonotis leonurus (L.) W. T. Aiton	LAMIACEAE		naturalized	acceptance uncertain
Leontodon saxatilis Lam.	ASTERACEAE	HAIRY HAWKBIT	naturalized	
Leontodon saxatilis Lam. subsp. longirostris (Finch & P. D. Sell) P. Silva	ASTERACEAE		naturalized	
Leontodon saxatilis Lam. subsp. saxatilis	ASTERACEAE		naturalized	
Leonurus sibiricus L.	LAMIACEAE		naturalized	acceptance uncertain
Lepechinia calycina (Benth.) Epling ex Munz	LAMIACEAE		native	
Lepechinia cardiophylla Epling	LAMIACEAE	HEART-LEAVED PITCHER SAGE	native	
Lepechinia fragrans (Greene) Epling	LAMIACEAE	FRAGRANT PITCHER SAGE	native	
Lepechinia ganderi Epling	LAMIACEAE	GANDER'S PITCHER SAGE	native	
Lepechinia rossii S. Boyd & Mistretta	LAMIACEAE	ROSS' PITCHER SAGE	native	
Lepidium acutidens (A. Gray) Howell	BRASSICACEAE		native	
Lepidium appelianum Al-Shehbaz	BRASSICACEAE	WHITE-TOP	naturalized	
Lepidium campestre (L.) W. T. Aiton	BRASSICACEAE		naturalized	
Lepidium chalepense L.	BRASSICACEAE	LENS-PODDED HOARY CRESS	naturalized	
Lepidium coronopus (L.) Al-Shehbaz	BRASSICACEAE	SWINE CRESS	naturalized	
Lepidium densiflorum Schrad.	BRASSICACEAE		native	
Lepidium dictyotum A. Gray	BRASSICACEAE		native	
Lepidium didymum L.	BRASSICACEAE	LESSER SWINE CRESS	naturalized	
Lepidium draba L.	BRASSICACEAE	HEART-PODDED HOARY CRESS	naturalized	
Lepidium flavum Torr.	BRASSICACEAE		native	
Lepidium fremontii S. Watson	BRASSICACEAE		native	
Lepidium heterophyllum Benth.	BRASSICACEAE		naturalized	
Lepidium jaredii Brandegee	BRASSICACEAE	JARED'S PEPPERGRASS	native	
Lepidium lasiocarpum Nutt.	BRASSICACEAE		native	
Lepidium lasiocarpum Nutt. subsp. lasiocarpum	BRASSICACEAE		native	
Lepidium latifolium L.	BRASSICACEAE	PERENNIAL PEPPERWEED	naturalized	
Lepidium latipes Hook.	BRASSICACEAE		native	
Lepidium montanum Nutt.	BRASSICACEAE		native	
Lepidium nitidum Nutt.	BRASSICACEAE		native	
Lepidium oblongum Small	BRASSICACEAE		native	
Lepidium oxycarpum Torr. & A. Gray	BRASSICACEAE		native	
Lepidium perfoliatum L.	BRASSICACEAE		naturalized	
Lepidium pinnatifidum Ledeb.	BRASSICACEAE		naturalized	
Lepidium ramosissimum A. Nelson	BRASSICACEAE		native	
Lepidium strictum (S. Watson) Rattan	BRASSICACEAE		native	
Lepidium thurberi Wooton	BRASSICACEAE		native	
Lepidium virginicum L.	BRASSICACEAE		native	
Lepidium virginicum L. subsp. menziesii (DC.) Thell.	BRASSICACEAE		native	
Lepidium virginicum L. subsp. virginicum	BRASSICACEAE		native	
Lepidospartum latisquamum S. Watson	ASTERACEAE		native	
Lepidospartum squamatum (A. Gray) A. Gray	ASTERACEAE		native	
Leptochloa dubia (Kunth) Nees	POACEAE	GREEN SPRANGLETOP	native	
Leptochloa fusca (L.) Kunth	POACEAE	SPRANGLETOP	native	
Leptochloa fusca (L.) Kunth subsp. fascicularis (Lam.) N. Snow	POACEAE	BEARDED SPRANGLETOP	native	
Leptochloa fusca (L.) Kunth subsp. uninervia (J. Presl) N. Snow	POACEAE	MEXICAN SPRANGLETOP	native	
Leptochloa panicea (Retz.) Ohwi	POACEAE		native	
Leptochloa panicea (Retz.) Ohwi subsp. brachiata (Steudl.) N. Snow	POACEAE	RED SPRANGLETOP	native	
Leptochloa viscida (Scribn.) Beal	POACEAE	SONORAN SPRANGLETOP	native	
Leptosiphon acicularis (Greene) Jeps.	POLEMONIACEAE	BRISTLY LEPTOSIPHON	native	
Leptosiphon ambiguus (Rattan) J. M. Porter & L. A. Johnson	POLEMONIACEAE	SERPENTINE LEPTOSIPHON	native	
Leptosiphon androsaceus Benth.	POLEMONIACEAE		native	
Leptosiphon aureus (Nutt.) Benth. ex E. Vilm.	POLEMONIACEAE		native	
Leptosiphon aureus (Nutt.) Benth. ex E. Vilm. subsp. aureus	POLEMONIACEAE		native	
Leptosiphon aureus (Nutt.) Benth. ex E. Vilm. subsp. decorus (A. Gray) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Leptosiphon bicolor Nutt.	POLEMONIACEAE		native	
Leptosiphon bolanderi (A. Gray) J.M. Porter & L.A. Johnson	POLEMONIACEAE		native	
Leptosiphon breviculus (A. Gray) J.M. Porter & L.A. Johnson	POLEMONIACEAE		native	
Leptosiphon ciliatus (Benth.) Jeps.	POLEMONIACEAE	WHISKER BRUSH	native	
Leptosiphon croceus (Eastw.) J. M. Porter & L. A. Johnson	POLEMONIACEAE	COAST YELLOW LEPTOSIPHON	native	
Leptosiphon filipes (Benth.) J.M. Porter & L.A. Johnson	POLEMONIACEAE		native	
Leptosiphon floribundus (A. Gray) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Leptosiphon floribundus (A. Gray) J. M. Porter & L. A. Johnson subsp. floribundus	POLEMONIACEAE		native	
Leptosiphon floribundus (A. Gray) J. M. Porter & L. A. Johnson subsp. glaber (R. Patt.) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Leptosiphon floribundus (A. Gray) J. M. Porter & L. A. Johnson subsp. hallii (Jeps.) J. M. Porter & L. A. Johnson	POLEMONIACEAE	SANTA ROSA MOUNTAINS LEPTOSIPHON	native	
Leptosiphon grandiflorus Benth.	POLEMONIACEAE	LARGE-FLOWERED LEPTOSIPHON	native	
Leptosiphon harknessii (Curran) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Leptosiphon jepsonii (Schemske & Goodwillie) J. M. Porter & L. A. Johnson	POLEMONIACEAE	JEPSON'S LEPTOSIPHON	native	
Leptosiphon latisectus (E. G. Buxton) J. M. Porter & L. A. Johnson	POLEMONIACEAE	BROAD-LOBED LEPTOSIPHON	native	
Leptosiphon lemmonii (A. Gray) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Leptosiphon liniflorus (Benth.) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Leptosiphon minimus (H. Mason) R. Battaglia	POLEMONIACEAE		native	
Leptosiphon montanus (Greene) J. M. Porter & L. A. Johnson	POLEMONIACEAE	MUSTANG CLOVER	native	
Leptosiphon nudatus (Greene) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Leptosiphon nuttallii (A. Gray) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Leptosiphon nuttallii (A. Gray) J. M. Porter & L. A. Johnson subsp. howellii (T. W. Nelson & R. Patt.) J. M. Porter & L. A. Johnson	POLEMONIACEAE	MOUNT TEDOC LEPTOSIPHON	native	
Leptosiphon nuttallii (A. Gray) J. M. Porter & L. A. Johnson subsp. nuttallii	POLEMONIACEAE		native	
Leptosiphon nuttallii (A. Gray) J. M. Porter & L. A. Johnson subsp. pubescens (R. Patt.) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Leptosiphon oblanceolatus (Brand) J. M. Porter & L. A. Johnson	POLEMONIACEAE	SIERRA NEVADA LEPTOSIPHON	native	
Leptosiphon pachyphyllus (R. Patt.) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Leptosiphon parviflorus Benth.	POLEMONIACEAE		native	
Leptosiphon pygmaeus (Brand) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Leptosiphon pygmaeus (Brand) J. M. Porter & L. A. Johnson subsp. continentalis (P. H. Raven) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Leptosiphon pygmaeus (Brand) J. M. Porter & L. A. Johnson subsp. pygmaeus	POLEMONIACEAE	PYGMY LEPTOSIPHON	native	
Leptosiphon rattanii (A. Gray) J. M. Porter & L. A. Johnson	POLEMONIACEAE	RATTAN'S LEPTOSIPHON	native	
Leptosiphon rosaceus (Hook. f.) Battaglia	POLEMONIACEAE	ROSE LEPTOSIPHON	native	
Leptosiphon septentrionalis (H. Mason) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Leptosiphon serrulatus (Greene) J. M. Porter & L. A. Johnson	POLEMONIACEAE	MADERA LEPTOSIPHON	native	
Leptospermum laevigatum (Gaertn.) F. Muell.	MYRTACEAE	AUSTRALIAN TEA TREE	naturalized	
Leptosyne bigelovii A. Gray	ASTERACEAE		native	
Leptosyne californica Nutt.	ASTERACEAE		native	
Leptosyne calliopsidea (DC.) A. Gray	ASTERACEAE		native	
Leptosyne douglasii DC.	ASTERACEAE		native	
Leptosyne gigantea Kellogg	ASTERACEAE	GIANT TICKSEED	native	
Leptosyne hamiltonii Elmer	ASTERACEAE	MOUNT HAMILTON TICKSEED	native	
Leptosyne maritima (Nutt.) A. Gray	ASTERACEAE	SEA DAHLIA	native	
Leptosyne stillmanii A. Gray	ASTERACEAE		native	
Lessingia arachnoidea Greene	ASTERACEAE	CRYSTAL SPRINGS LESSINGIA	native	
Lessingia germanorum Cham.	ASTERACEAE	SAN FRANCISCO LESSINGIA	native	
Lessingia glandulifera A. Gray	ASTERACEAE		native	
Lessingia glandulifera A. Gray var. glandulifera	ASTERACEAE		native	
Lessingia glandulifera A. Gray var. peirsonii (J.T. Howell) Markos	ASTERACEAE		native	
Lessingia glandulifera A. Gray var. tomentosa (Greene) Ferris	ASTERACEAE	WARNER SPRINGS LESSINGIA	native	
Lessingia hololeuca Greene	ASTERACEAE	WOOLLY-HEADED LESSINGIA	native	
Lessingia lemmonii A. Gray	ASTERACEAE		native	
Lessingia leptoclada A. Gray	ASTERACEAE	SIERRA LESSINGIA	native	
Lessingia micradenia Greene	ASTERACEAE		native	
Lessingia micradenia Greene var. glabrata (D. D. Keck) Ferris	ASTERACEAE	SMOOTH LESSINGIA	native	
Lessingia micradenia Greene var. micradenia	ASTERACEAE	TAMALPAIS LESSINGIA	native	
Lessingia nana A. Gray	ASTERACEAE	DWARF LESSINGIA	native	
Lessingia nemaclada Greene	ASTERACEAE		native	
Lessingia pectinata Greene	ASTERACEAE		native	
Lessingia pectinata Greene var. pectinata	ASTERACEAE		native	
Lessingia pectinata Greene var. tenuipes (J.T. Howell) Markos	ASTERACEAE		native	
Lessingia ramulosa A. Gray	ASTERACEAE		native	
Lessingia tenuis (A. Gray) Coville	ASTERACEAE	SPRING LESSINGIA	native	
Lessingia virgata A. Gray	ASTERACEAE	WAND LESSINGIA	native	
Leucanthemum lacustre (Brot.) Samp.	ASTERACEAE	PORTUGUESE DAISY	naturalized	
Leucanthemum maximum (Ramond) DC.	ASTERACEAE	SHASTA DAISY	naturalized	
Leucanthemum vulgare Lam.	ASTERACEAE	OX-EYE DAISY	naturalized	
Leucocrinum montanum Nutt. ex A. Gray	AGAVACEAE		native	
Leucosyris arida (B.L. Turner & D.B. Horne) Pruski & R.L. Hartm.	ASTERACEAE		native	
Leucosyris carnosa (A. Gray) Greene	ASTERACEAE		native	
Leucothoe davisiae Torr. ex A. Gray	ERICACEAE	SIERRA LAUREL	native	
Lewisia brachycalyx A. Gray	MONTIACEAE	SHORT-SEPALED LEWISIA	native	
Lewisia cantelovii J. T. Howell	MONTIACEAE	CANTELOW'S LEWISIA	native	
Lewisia congdonii (Rydb.) S. Clay	MONTIACEAE	CONGDON'S LEWISIA	native	
Lewisia cotyledon (S. Watson) B. L. Rob.	MONTIACEAE	CLIFF MAIDS	native	
Lewisia cotyledon (S. Watson) B. L. Rob. var. cotyledon	MONTIACEAE		native	
Lewisia cotyledon (S. Watson) B. L. Rob. var. heckneri (C. V. Morton) Munz	MONTIACEAE	HECKNER'S LEWISIA	native	
Lewisia cotyledon (S. Watson) B. L. Rob. var. howellii (S. Watson) Jeps.	MONTIACEAE	HOWELL'S LEWISIA	native	
Lewisia disepala Rydb.	MONTIACEAE	YOSEMITE LEWISIA	native	
Lewisia glandulosa (Rydb.) S. Clay	MONTIACEAE	GLANDULAR LEWISIA	native	
Lewisia kelloggii K. Brandegee	MONTIACEAE	KELLOGG'S LEWISIA	native	
Lewisia kelloggii K. Brandegee subsp. hutchisonii Dempster	MONTIACEAE	HUTCHISON'S LEWISIA	native	
Lewisia kelloggii K. Brandegee subsp. kelloggii	MONTIACEAE		native	
Lewisia leeana (Porter) B. L. Rob.	MONTIACEAE	QUILL-LEAVED LEWISIA	native	
Lewisia longipetala (Piper) S. Clay	MONTIACEAE	LONG-PETALED LEWISIA	native	
Lewisia nevadensis (A. Gray) B. L. Rob.	MONTIACEAE	NEVADA LEWISIA	native	
Lewisia oppositifolia (S. Watson) B. L. Rob.	MONTIACEAE	OPPOSITE-LEAVED LEWISIA	native	
Lewisia pygmaea (A. Gray) B. L. Rob.	MONTIACEAE	DWARF LEWISIA	native	
Lewisia rediviva Pursh	MONTIACEAE		native	
Lewisia rediviva Pursh var. minor (Rydb.) Munz	MONTIACEAE	SMALL BITTERROOT	native	
Lewisia rediviva Pursh var. rediviva	MONTIACEAE	BITTERROOT	native	
Lewisia serrata Heckard & Stebbins	MONTIACEAE	SAW-TOOTHED LEWISIA	native	
Lewisia stebbinsii Gankin & W. R. Hildreth	MONTIACEAE	STEBBINS' LEWISIA	native	
Lewisia triphylla (S. Watson) B. L. Rob.	MONTIACEAE	THREE-LEAVED LEWISIA	native	
Ligusticum apiifolium (Nutt.) A. Gray	APIACEAE		native	
Ligusticum californicum J. M. Coult. & Rose	APIACEAE		native	
Ligusticum grayi J. M. Coult. & Rose	APIACEAE		native	
Ligustrum japonicum Thunb.	OLEACEAE	JAPANESE PRIVET	naturalized	
Ligustrum lucidum W. T. Aiton	OLEACEAE	CHINESE PRIVET	naturalized	
Ligustrum ovalifolium Hassk.	OLEACEAE	CALIFORNIA PRIVET	naturalized	
Lilaeopsis masonii Mathias & Constance	APIACEAE	MASON'S LILAEOPSIS	native	
Lilaeopsis occidentalis J. M. Coult. & Rose	APIACEAE		native	
Lilium bolanderi S. Watson	LILIACEAE	BOLANDER'S LILY	native	
Lilium columbianum Leichtlin	LILIACEAE	COLUMBIA LILY	native	
Lilium humboldtii Roezl & Leichtlin ex Duch.	LILIACEAE		native	
Lilium humboldtii Roezl & Leichtlin subsp. humboldtii	LILIACEAE	HUMBOLDT LILY	native	
Lilium humboldtii Roezl & Leichtlin subsp. ocellatum (Kellogg) Thorne	LILIACEAE	OCELLATED HUMBOLDT LILY	native	
Lilium kelleyanum Lemmon	LILIACEAE	KELLEY'S LILY	native	
Lilium kelloggii Purdy	LILIACEAE	KELLOGG'S LILY	native	
Lilium maritimum Kellogg	LILIACEAE	COAST LILY	native	
Lilium occidentale Purdy	LILIACEAE	WESTERN LILY	native	
Lilium pardalinum Kellogg	LILIACEAE		native	
Lilium pardalinum Kellogg subsp. pardalinum	LILIACEAE	LEOPARD LILY	native	
Lilium pardalinum Kellogg subsp. pitkinense (Beane & Vollmer) M. W. Skinner	LILIACEAE	PITKIN MARSH LILY	native	
Lilium pardalinum Kellogg subsp. shastense (Eastw.) M. W. Skinner	LILIACEAE	SHASTA LILY	native	
Lilium pardalinum Kellogg subsp. vollmeri (Eastw.) M. W. Skinner	LILIACEAE	VOLLMER'S LILY	native	
Lilium pardalinum Kellogg subsp. wigginsii (Beane & Vollmer) M. W. Skinner	LILIACEAE	WIGGINS' LILY	native	
Lilium parryi S. Watson	LILIACEAE	LEMON LILY	native	
Lilium parvum Kellogg	LILIACEAE	SIERRA TIGER LILY	native	
Lilium rubescens S. Watson	LILIACEAE	REDWOOD LILY	native	
Lilium washingtonianum Kellogg	LILIACEAE	WASHINGTON LILY	native	
Lilium washingtonianum Kellogg subsp. purpurascens (Stearn) M. W. Skinner	LILIACEAE	PURPLE-FLOWERED WASHINGTON LILY	native	
Lilium washingtonianum Kellogg subsp. washingtonianum	LILIACEAE		native	
Limnanthes alba Benth.	LIMNANTHACEAE		native	
Limnanthes alba Benth. subsp. alba	LIMNANTHACEAE		native	
Limnanthes alba Benth. subsp. parishii (Jeps.) Morin	LIMNANTHACEAE		native	
Limnanthes alba Benth. subsp. versicolor (Greene) C. T. Mason	LIMNANTHACEAE		native	
Limnanthes bakeri J. T. Howell	LIMNANTHACEAE	BAKER'S MEADOWFOAM	native	
Limnanthes douglasii R. Br.	LIMNANTHACEAE		native	
Limnanthes douglasii R. Br. subsp. douglasii	LIMNANTHACEAE		native	
Limnanthes douglasii R. Br. subsp. nivea (C. T. Mason) C. T. Mason	LIMNANTHACEAE		native	
Limnanthes douglasii R. Br. subsp. rosea (Benth.) C. T. Mason	LIMNANTHACEAE		native	
Limnanthes douglasii R. Br. subsp. striata (Jeps.) Morin	LIMNANTHACEAE		native	
Limnanthes douglasii R. Br. subsp. sulphurea (C. T. Mason) C. T. Mason	LIMNANTHACEAE	POINT REYES MEADOWFOAM	native	
Limnanthes floccosa Howell	LIMNANTHACEAE		native	
Limnanthes floccosa Howell subsp. bellingeriana (M. Peck) Arroyo	LIMNANTHACEAE	BELLINGER'S MEADOWFOAM	native	
Limnanthes floccosa Howell subsp. californica Arroyo	LIMNANTHACEAE	BUTTE COUNTY MEADOWFOAM	native	
Limnanthes floccosa Howell subsp. floccosa	LIMNANTHACEAE	WOOLLY MEADOWFOAM	native	
Limnanthes montana Jeps.	LIMNANTHACEAE		native	
Limnanthes vinculans Ornduff	LIMNANTHACEAE	SEBASTOPOL MEADOWFOAM	native	
Limnobium spongia (Bosc) Rich. ex Steud.	HYDROCHARITACEAE	AMERICAN FROGBIT	naturalized	acceptance uncertain
Limonium californicum (Boiss.) A. Heller	PLUMBAGINACEAE	WESTERN MARSH-ROSEMARY	native	
Limonium duriusculum (Girard) Fourr.	PLUMBAGINACEAE		naturalized	
Limonium perezii (Stapf) F. T. Hubb.	PLUMBAGINACEAE		naturalized	
Limonium ramosissimum (Poir.) Maire	PLUMBAGINACEAE		naturalized	
Limonium sinuatum (L.) Mill.	PLUMBAGINACEAE		naturalized	
Limosella acaulis Sessé & Moc.	SCROPHULARIACEAE		native	
Limosella aquatica L.	SCROPHULARIACEAE		native	
Limosella australis R. Br.	SCROPHULARIACEAE	DELTA MUDWORT	naturalized	
Linanthus arenicola (M. E. Jones) Jeps. & V. L. Bailey	POLEMONIACEAE	SAND LINANTHUS	native	
Linanthus bellus (A. Gray) Greene	POLEMONIACEAE	DESERT BEAUTY	native	
Linanthus bigelovii (A. Gray) Greene	POLEMONIACEAE		native	
Linanthus californicus (Hook. & Arn.) J. M. Porter & L. A. Johnson	POLEMONIACEAE	PRICKLY PHLOX	native	
Linanthus campanulatus (A. Gray) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Linanthus concinnus Milliken	POLEMONIACEAE	SAN GABRIEL LINANTHUS	native	
Linanthus demissus (A. Gray) Greene	POLEMONIACEAE		native	
Linanthus dianthiflorus (Benth.) Greene	POLEMONIACEAE		native	
Linanthus dichotomus Benth.	POLEMONIACEAE		native	
Linanthus dichotomus Benth. subsp. dichotomus	POLEMONIACEAE	EVENING SNOW	native	
Linanthus dichotomus Benth. subsp. meridianus (Eastw.) H. Mason	POLEMONIACEAE		native	
Linanthus filiformis (Parry ex A. Gray) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Linanthus inyoensis (I. M. Johnst.) J. M. Porter & L. A. Johnson	POLEMONIACEAE		native	
Linanthus jaegeri (Munz) J. M. Porter & L. A. Johnson	POLEMONIACEAE	SAN JACINTO LINANTHUS	native	
Linanthus jonesii (A. Gray) Greene	POLEMONIACEAE		native	
Linanthus killipii H. Mason	POLEMONIACEAE	BALDWIN LAKE LINANTHUS	native	
Linanthus maculatus (Parish) Milliken	POLEMONIACEAE	LITTLE SAN BERNARDINO MOUNTAINS LINANTHUS	native	
Linanthus orcuttii (Parry & A. Gray) Jeps.	POLEMONIACEAE	ORCUTT'S LINANTHUS	native	
Linanthus parryae (A. Gray) Greene	POLEMONIACEAE		native	
Linanthus pungens (Torr.) J. M. Porter & L. A. Johnson	POLEMONIACEAE	GRANITE GILIA	native	
Linaria bipartita (Vent.) Willd.	PLANTAGINACEAE		naturalized	
Linaria dalmatica (L.) Mill.	PLANTAGINACEAE		naturalized	
Linaria dalmatica (L.) Mill. subsp. dalmatica	PLANTAGINACEAE	DALMATIAN TOADFLAX	naturalized	
Linaria maroccana Hook. f.	PLANTAGINACEAE		naturalized	
Linaria pinifolia (Poir.) Thell.	PLANTAGINACEAE		naturalized	
Linaria vulgaris Mill.	PLANTAGINACEAE	BUTTER-AND-EGGS	naturalized	
Lindernia dubia (L.) Pennell	PLANTAGINACEAE		native	
Linnaea borealis L.	LINNAEACEAE		native	
Linnaea borealis L. var. longiflora Torr.	LINNAEACEAE		native	
Linum bienne Mill.	LINACEAE		naturalized	
Linum grandiflorum Desf.	LINACEAE		naturalized	
Linum lewisii Pursh	LINACEAE		native	
Linum lewisii Pursh var. lewisii	LINACEAE		native	
Linum puberulum (Engelm.) A. Heller	LINACEAE	PLAINS FLAX	native	
Linum trigynum L.	LINACEAE		naturalized	acceptance uncertain
Linum usitatissimum L.	LINACEAE		naturalized	
Lipocarpha aristulata (Coville) G. C. Tucker	CYPERACEAE		native	
Lipocarpha micrantha (Vahl) G. C. Tucker	CYPERACEAE		native	
Lipocarpha occidentalis (A. Gray) G. C. Tucker	CYPERACEAE		native	
Listera banksiana Lindl.	ORCHIDACEAE	NORTHWEST TWAYBLADE	native	
Listera convallarioides (Sw.) Nutt.	ORCHIDACEAE	BROAD-LEAVED TWAYBLADE	native	
Listera cordata (L.) R. Br.	ORCHIDACEAE	HEART-LEAVED TWAYBLADE	native	
Lithophragma affine A. Gray	SAXIFRAGACEAE		native	
Lithophragma bolanderi A. Gray	SAXIFRAGACEAE		native	
Lithophragma campanulatum Howell	SAXIFRAGACEAE		native	
Lithophragma cymbalaria Torr. & A. Gray	SAXIFRAGACEAE		native	
Lithophragma glabrum Nutt.	SAXIFRAGACEAE		native	
Lithophragma heterophyllum (Hook. & Arn.) Hook. & Arn. ex Torr. & A. Gray	SAXIFRAGACEAE		native	
Lithophragma maximum Bacig.	SAXIFRAGACEAE	SAN CLEMENTE ISLAND WOODLAND STAR	native	
Lithophragma parviflorum (Hook.) Nutt. ex Torr. & A. Gray	SAXIFRAGACEAE		native	
Lithophragma parviflorum (Hook.) Nutt. ex Torr. & A. Gray var. parviflorum	SAXIFRAGACEAE		native	
Lithophragma parviflorum (Hook.) Nutt. ex Torr. & A. Gray var. trifoliatum (Eastw.) Jeps.	SAXIFRAGACEAE		native	
Lithophragma tenellum Nutt.	SAXIFRAGACEAE		native	
Lithospermum arvense L.	BORAGINACEAE	GROMWELL	naturalized	
Lithospermum californicum A. Gray	BORAGINACEAE	CALIFORNIA STONESEED	native	
Lithospermum incisum Lehm.	BORAGINACEAE	PLAINS STONESEED	native	
Lithospermum ruderale Lehm.	BORAGINACEAE	WESTERN STONESEED	native	
Lobelia cardinalis L.	CAMPANULACEAE		native	
Lobelia cardinalis L. var. pseudosplendens McVaugh	CAMPANULACEAE	CARDINAL FLOWER	native	
Lobelia dunnii Greene	CAMPANULACEAE		native	
Lobelia dunnii Greene var. serrata (A. Gray) McVaugh	CAMPANULACEAE		native	
Lobularia maritima (L.) Desv.	BRASSICACEAE		naturalized	
Loeflingia squarrosa Nutt.	CARYOPHYLLACEAE	SPREADING PYGMYLEAF	native	
Loeseliastrum depressum (M. E. Jones ex A. Gray) J. M. Porter & L. A. Johnson	POLEMONIACEAE	DEPRESSED STANDING-CYPRESS	native	
Loeseliastrum matthewsii (A. Gray) Timbrook	POLEMONIACEAE	DESERT CALICO	native	
Loeseliastrum schottii (Torr.) Timbrook	POLEMONIACEAE		native	
Logfia arizonica (A. Gray) Holub	ASTERACEAE	ARIZONA COTTONROSE	native	
Logfia depressa (A. Gray) Holub	ASTERACEAE	HIERBA LIMPIA	native	
Logfia filaginoides (Hook. & Arn.) Morefield	ASTERACEAE	CALIFORNIA COTTONROSE	native	
Logfia gallica (L.) Coss. & Germ.	ASTERACEAE	DAGGERLEAF COTTONROSE	naturalized	
Lomatium bicolor (S. Watson) J. M. Coult. & Rose	APIACEAE		native	
Lomatium bicolor (S. Watson) J. M. Coult. & Rose var. leptocarpum (Torr. & A. Gray) Schlessman	APIACEAE		native	
Lomatium californicum (Nutt.) Mathias & Constance	APIACEAE		native	
Lomatium canbyi (J. M. Coult. & Rose) J. M. Coult. & Rose	APIACEAE	CANBY'S LOMATIUM	native	
Lomatium caruifolium (Hook. & Arn.) J. M. Coult. & Rose	APIACEAE		native	
Lomatium caruifolium (Hook. & Arn.) J. M. Coult. & Rose var. caruifolium	APIACEAE		native	
Lomatium caruifolium (Hook. & Arn.) J. M. Coult. & Rose var. denticulatum Jeps.	APIACEAE		native	
Lomatium ciliolatum Jeps.	APIACEAE		native	
Lomatium congdonii J. M. Coult. & Rose	APIACEAE	CONGDON'S LOMATIUM	native	
Lomatium dasycarpum (Torr. & A. Gray) J. M. Coult. & Rose	APIACEAE		native	
Lomatium dasycarpum (Torr. & A. Gray) J. M. Coult. & Rose subsp. dasycarpum	APIACEAE		native	
Lomatium dasycarpum (Torr. & A. Gray) J. M. Coult. & Rose subsp. tomentosum (Benth.) W. L. Theob.	APIACEAE		native	
Lomatium dissectum (Nutt.) Mathias & Constance	APIACEAE		native	
Lomatium dissectum (Nutt.) Mathias & Constance var. dissectum	APIACEAE		native	
Lomatium dissectum (Nutt.) Mathias & Constance var. multifidum (Nutt.) Mathias & Constance	APIACEAE		native	
Lomatium engelmannii Mathias	APIACEAE	ENGELMANN'S LOMATIUM	native	
Lomatium foeniculaceum (Nutt.) J. M. Coult. & Rose	APIACEAE		native	
Lomatium foeniculaceum (Nutt.) J. M. Coult. & Rose subsp. fimbriatum W. L. Theob.	APIACEAE		native	
Lomatium foeniculaceum (Nutt.) J. M. Coult. & Rose subsp. inyoense (Mathias & Constance ex Munz & J. C. Roos) W. L. Theob.	APIACEAE	INYO LOMATIUM	native	
Lomatium foeniculaceum (Nutt.) J. M. Coult. & Rose subsp. macdougalii (J. M. Coult. & Rose) W. L. Theob	APIACEAE	MACDOUGAL'S LOMATIUM	native	
Lomatium grayi (J. M. Coult. & Rose) J. M. Coult. & Rose	APIACEAE	GRAY'S LOMATIUM	native	
Lomatium hallii (S. Watson) J. M. Coult. & Rose	APIACEAE		native	
Lomatium hendersonii (J. M. Coult. & Rose) J. M. Coult. & Rose	APIACEAE	HENDERSON'S LOMATIUM	native	
Lomatium hooveri (Mathias & Constance) Constance & Ertter	APIACEAE	HOOVER'S LOMATIUM	native	
Lomatium howellii (S. Watson) Jeps.	APIACEAE	HOWELL'S LOMATIUM	native	
Lomatium insulare (Eastw.) Munz	APIACEAE	SAN NICOLAS ISLAND LOMATIUM	native	
Lomatium lucidum (Torr. & A. Gray) Jeps.	APIACEAE		native	
Lomatium macrocarpum (Torr. & A. Gray) J. M. Coult. & Rose	APIACEAE		native	
Lomatium marginatum (Benth.) J. M. Coult. & Rose	APIACEAE		native	
Lomatium marginatum (Benth.) J. M. Coult. & Rose var. marginatum	APIACEAE		native	
Lomatium marginatum (Benth.) J. M. Coult. & Rose var. purpureum (Jeps.) Jeps.	APIACEAE		native	
Lomatium martindalei (J. M. Coult. & Rose) J. M. Coult. & Rose	APIACEAE	COAST RANGE LOMATIUM	native	
Lomatium mohavense (J. M. Coult. & Rose) J. M. Coult. & Rose	APIACEAE		native	
Lomatium nevadense (S. Watson) J. M. Coult. & Rose	APIACEAE		native	
Lomatium nevadense (S. Watson) J. M. Coult. & Rose var. nevadense	APIACEAE		native	
Lomatium nevadense (S. Watson) J. M. Coult. & Rose var. parishii (J. M. Coult. & Rose) Jeps.	APIACEAE		native	
Lomatium nudicaule (Pursh) J. M. Coult. & Rose	APIACEAE		native	
Lomatium observatorium Constance & Ertter	APIACEAE	MOUNT HAMILTON LOMATIUM	native	
Lomatium parryi (S. Watson) J. F. Macbr.	APIACEAE		native	
Lomatium parvifolium (Hook. & Arn.) Jeps.	APIACEAE	SMALL-LEAVED LOMATIUM	native	
Lomatium peckianum Mathias & Constance	APIACEAE	PECK'S LOMATIUM	native	
Lomatium piperi J. M. Coult. & Rose	APIACEAE		native	
Lomatium plummerae (J. M. Coult. & Rose) J. M. Coult. & Rose	APIACEAE		native	
Lomatium ravenii Mathias & Constance	APIACEAE	RAVEN'S LOMATIUM	native	
Lomatium repostum (Jeps.) Mathias	APIACEAE	NAPA LOMATIUM	native	
Lomatium rigidum (M. E. Jones) Jeps.	APIACEAE	STIFF LOMATIUM	native	
Lomatium shevockii R. L. Hartm. & Constance	APIACEAE	OWENS PEAK LOMATIUM	native	
Lomatium stebbinsii M. Schlessman & Constance	APIACEAE	STEBBINS' LOMATIUM	native	
Lomatium torreyi (J. M. Coult. & Rose) J. M. Coult. & Rose	APIACEAE		native	
Lomatium tracyi Mathias & Constance	APIACEAE	TRACY'S LOMATIUM	native	
Lomatium triternatum (Pursh) J. M. Coult. & Rose	APIACEAE		native	
Lomatium triternatum (Pursh) J. M. Coult. & Rose var. macrocarpum (J. M. Coult. & Rose) Mathias	APIACEAE		native	
Lomatium triternatum (Pursh) J. M. Coult. & Rose var. triternatum	APIACEAE		native	
Lomatium utriculatum (Nutt. ex Torr. & A. Gray) J. M. Coult. & Rose	APIACEAE		native	
Lomatium vaginatum J. M. Coult. & Rose	APIACEAE		native	
Lonicera cauriana Fernald	CAPRIFOLIACEAE		native	
Lonicera ciliosa (Pursh) Poir.	CAPRIFOLIACEAE	ORANGE HONEYSUCKLE	native	
Lonicera conjugialis Kellogg	CAPRIFOLIACEAE		native	
Lonicera etrusca Santi	CAPRIFOLIACEAE		naturalized	
Lonicera hispidula (Lindl.) Douglas ex Torr. & A. Gray	CAPRIFOLIACEAE		native	
Lonicera interrupta Benth.	CAPRIFOLIACEAE		native	
Lonicera involucrata (Richardson) Banks ex Spreng.	CAPRIFOLIACEAE	TWINBERRY	native	
Lonicera involucrata (Richardson) Banks ex Spreng. var. involucrata	CAPRIFOLIACEAE		native	
Lonicera involucrata (Richardson) Banks ex Spreng. var. ledebourii (Eschsch.) Jeps.	CAPRIFOLIACEAE		native	
Lonicera japonica Thunb. ex Murray	CAPRIFOLIACEAE	JAPANESE HONEYSUCKLE	naturalized	
Lonicera subspicata Hook. & Arn.	CAPRIFOLIACEAE		native	
Lonicera subspicata Hook. & Arn. var. denudata Rehder	CAPRIFOLIACEAE		native	
Lonicera subspicata Hook. & Arn. var. subspicata	CAPRIFOLIACEAE	SANTA BARBARA HONEYSUCKLE	native	
Lonicera tatarica L.	CAPRIFOLIACEAE		naturalized	
Lotus angustissimus L.	FABACEAE		naturalized	
Lotus corniculatus L.	FABACEAE	BIRD'S-FOOT TREFOIL	naturalized	
Lotus tenuis Waldst. & Kit. ex Willd.	FABACEAE		naturalized	
Lotus uliginosus Schkuhr	FABACEAE		naturalized	
Ludwigia grandiflora (Michx.) Greuter & Burdet	ONAGRACEAE	LARGE-FLOWERED PRIMROSE-WILLOW	naturalized	
Ludwigia hexapetala (Hook. & Arn.) Zardini, H. Gu, & P. H. Raven	ONAGRACEAE	URUGUAYAN PRIMROSE-WILLOW	naturalized	
Ludwigia palustris (L.) Elliott	ONAGRACEAE		native	
Ludwigia peploides (Kunth) P. H. Raven	ONAGRACEAE		native	
Ludwigia peploides (Kunth) P. H. Raven subsp. montevidensis (Spreng.) P. H. Raven	ONAGRACEAE		naturalized	
Ludwigia peploides (Kunth) P. H. Raven subsp. peploides	ONAGRACEAE		native	
Ludwigia repens J. R. Forst.	ONAGRACEAE		native	
Luetkea pectinata (Pursh) Kuntze	ROSACEAE		native	
Luina hypoleuca Benth.	ASTERACEAE		native	
Lunaria annua L.	BRASSICACEAE		naturalized	
Lupinus adsurgens Drew	FABACEAE		native	
Lupinus affinis J. Agardh	FABACEAE		native	
Lupinus albicaulis Douglas	FABACEAE		native	
Lupinus albifrons Benth. in Lindl.	FABACEAE		native	
Lupinus albifrons Benth. in Lindl. var. abramsii (C. P. Sm.) Hoover	FABACEAE	ABRAMS' LUPINE	native	
Lupinus albifrons Benth. in Lindl. var. albifrons	FABACEAE		native	
Lupinus albifrons Benth. in Lindl. var. collinus Greene	FABACEAE		native	
Lupinus albifrons Benth. in Lindl. var. douglasii (J. Agardh) C. P. Sm.	FABACEAE		native	
Lupinus andersonii S. Watson	FABACEAE		native	
Lupinus angustiflorus Eastw.	FABACEAE		native	
Lupinus antoninus Eastw.	FABACEAE	ANTHONY PEAK LUPINE	native	
Lupinus apertus A. Heller	FABACEAE		native	
Lupinus arboreus Sims	FABACEAE	YELLOW BUSH LUPINE	native	
Lupinus arbustus Douglas	FABACEAE	SPUR LUPINE	native	
Lupinus argenteus Pursh	FABACEAE		native	
Lupinus argenteus Pursh var. argenteus	FABACEAE		native	
Lupinus argenteus Pursh var. heteranthus (S. Watson) Barneby	FABACEAE		native	
Lupinus argenteus Pursh var. meionanthus (A. Gray) Barneby	FABACEAE		native	
Lupinus argenteus Pursh var. montigenus (A. Heller) Barneby	FABACEAE		native	
Lupinus argenteus Pursh var. palmeri (S. Watson) Barneby	FABACEAE		native	
Lupinus arizonicus (S. Watson) S. Watson	FABACEAE	ARIZONA LUPINE	native	
Lupinus benthamii A. Heller	FABACEAE	SPIDER LUPINE	native	
Lupinus bicolor Lindl.	FABACEAE	MINIATURE LUPINE	native	
Lupinus brevicaulis S. Watson	FABACEAE	SAND LUPINE	native	
Lupinus breweri A. Gray	FABACEAE		native	
Lupinus breweri A. Gray var. breweri	FABACEAE		native	
Lupinus breweri A. Gray var. bryoides C. P. Sm.	FABACEAE		native	
Lupinus breweri A. Gray var. grandiflorus C. P. Sm.	FABACEAE		native	
Lupinus cervinus Kellogg	FABACEAE	SANTA LUCIA LUPINE	native	
Lupinus chamissonis Eschsch.	FABACEAE		native	
Lupinus citrinus Kellogg	FABACEAE		native	
Lupinus citrinus Kellogg var. citrinus	FABACEAE	ORANGE LUPINE	native	
Lupinus citrinus Kellogg var. deflexus (Congdon) Jeps.	FABACEAE	MARIPOSA LUPINE	native	
Lupinus concinnus J. Agardh	FABACEAE	BAJADA LUPINE	native	
Lupinus constancei T. W. Nelson & J. P. Nelson	FABACEAE	THE LASSICS LUPINE	native	
Lupinus covillei Greene	FABACEAE		native	
Lupinus croceus Eastw.	FABACEAE		native	
Lupinus dalesiae Eastw.	FABACEAE	QUINCY LUPINE	native	
Lupinus duranii Eastw.	FABACEAE	MONO LAKE LUPINE	native	
Lupinus elatus I. M. Johnst.	FABACEAE	SILKY LUPINE	native	
Lupinus elmeri Greene	FABACEAE	SOUTH FORK MOUNTAIN LUPINE	native	
Lupinus excubitus M. E. Jones	FABACEAE	GRAPE SODA LUPINE	native	
Lupinus excubitus M. E. Jones var. austromontanus (A. Heller) C. P. Sm.	FABACEAE		native	
Lupinus excubitus M. E. Jones var. excubitus	FABACEAE		native	
Lupinus excubitus M. E. Jones var. hallii (Abrams) C. P. Sm.	FABACEAE		native	
Lupinus excubitus M. E. Jones var. johnstonii C. P. Sm.	FABACEAE	INTERIOR BUSH LUPINE	native	
Lupinus excubitus M. E. Jones var. medius (Jeps.) Munz	FABACEAE	MOUNTAIN SPRINGS BUSH LUPINE	native	
Lupinus flavoculatus A. Heller	FABACEAE		native	
Lupinus formosus Greene	FABACEAE		native	
Lupinus formosus Greene var. formosus	FABACEAE		native	
Lupinus formosus Greene var. robustus C. P. Sm.	FABACEAE		native	
Lupinus fulcratus Greene	FABACEAE		native	
Lupinus gracilentus Greene	FABACEAE	SLENDER LUPINE	native	
Lupinus grayi S. Watson	FABACEAE		native	
Lupinus guadalupensis Greene	FABACEAE	GUADALUPE ISLAND LUPINE	native	
Lupinus hirsutissimus Benth.	FABACEAE	STINGING LUPINE	native	
Lupinus holmgrenianus C. P. Sm.	FABACEAE	HOLMGRENS' LUPINE	native	
Lupinus hyacinthinus Greene	FABACEAE		native	
Lupinus lapidicola A. Heller	FABACEAE	HELLER'S MOUNT EDDY LUPINE	native	
Lupinus latifolius J. Agardh	FABACEAE		native	
Lupinus latifolius J. Agardh var. barbatus (L. F. Hend.) Munz	FABACEAE	BEARDED LUPINE	native	
Lupinus latifolius J. Agardh var. columbianus (A. Heller) C. P. Sm.	FABACEAE		native	
Lupinus latifolius J. Agardh var. dudleyi C. P. Sm.	FABACEAE		native	
Lupinus latifolius J. Agardh var. latifolius	FABACEAE		native	
Lupinus latifolius J. Agardh var. parishii C. P. Sm.	FABACEAE		native	
Lupinus latifolius J. Agardh var. viridifolius (A. Heller) C. P. Sm.	FABACEAE		native	
Lupinus lepidus Douglas ex Lindl.	FABACEAE	DWARF LUPINE	native	
Lupinus lepidus Douglas ex Lindl. var. confertus (Kellogg) C. P. Sm.	FABACEAE		native	
Lupinus lepidus Douglas ex Lindl. var. culbertsonii (Greene) C. P. Sm.	FABACEAE	HOCKETT MEADOWS LUPINE	native	
Lupinus lepidus Douglas ex Lindl. var. lobbii (S. Watson) C. L. Hitchc.	FABACEAE		native	
Lupinus lepidus Douglas ex Lindl. var. ramosus Jeps.	FABACEAE		native	
Lupinus lepidus Douglas ex Lindl. var. sellulus (Kellogg) Barneby	FABACEAE		native	
Lupinus lepidus Douglas ex Lindl. var. utahensis (S. Watson) C. L. Hitchc.	FABACEAE	STEMLESS LUPINE	native	
Lupinus leucophyllus Douglas ex Lindl.	FABACEAE		native	
Lupinus littoralis Douglas	FABACEAE		native	
Lupinus longifolius (S. Watson) Abrams	FABACEAE		native	
Lupinus ludovicianus Greene	FABACEAE	SAN LUIS OBISPO COUNTY LUPINE	native	
Lupinus luteolus Kellogg	FABACEAE	BUTTER LUPINE	native	
Lupinus magnificus M. E. Jones	FABACEAE		native	
Lupinus magnificus M. E. Jones var. glarecola M. E. Jones	FABACEAE	COSO MOUNTAINS LUPINE	native	
Lupinus magnificus M. E. Jones var. magnificus	FABACEAE	PANAMINT MOUNTAINS LUPINE	native	
Lupinus microcarpus Sims	FABACEAE	CHICK LUPINE	native	
Lupinus microcarpus Sims var. densiflorus (Benth.) Jeps.	FABACEAE		native	
Lupinus microcarpus Sims var. horizontalis (A. Heller) Jeps.	FABACEAE		native	
Lupinus microcarpus Sims var. microcarpus	FABACEAE		native	
Lupinus milo-bakeri C. P. Sm.	FABACEAE	MILO BAKER'S LUPINE	native	
Lupinus nanus Benth.	FABACEAE		native	
Lupinus nevadensis A. Heller	FABACEAE	NEVADA LUPINE	native	
Lupinus nipomensis Eastw.	FABACEAE	NIPOMO MESA LUPINE	native	
Lupinus obtusilobus A. Heller	FABACEAE		native	
Lupinus odoratus A. Heller	FABACEAE	MOJAVE LUPINE	native	
Lupinus onustus S. Watson	FABACEAE		native	
Lupinus pachylobus Greene	FABACEAE	BIG POD LUPINE	native	
Lupinus padre-crowleyi C. P. Sm.	FABACEAE	FATHER CROWLEY'S LUPINE	native	
Lupinus peirsonii H. Mason	FABACEAE	PEIRSON'S LUPINE	native	
Lupinus polyphyllus Lindl.	FABACEAE		native	
Lupinus polyphyllus Lindl. var. burkei (S. Watson) C. L. Hitchc.	FABACEAE		native	
Lupinus polyphyllus Lindl. var. pallidipes (A. Heller) C. P. Sm.	FABACEAE		native	
Lupinus polyphyllus Lindl. var. polyphyllus	FABACEAE		native	
Lupinus pratensis A. Heller	FABACEAE		native	
Lupinus pratensis A. Heller var. eriostachyus C. P. Sm.	FABACEAE		native	
Lupinus pratensis A. Heller var. pratensis	FABACEAE		native	
Lupinus prunophilus M. E. Jones	FABACEAE		native	acceptance uncertain
Lupinus pusillus Pursh	FABACEAE		native	
Lupinus pusillus Pursh var. intermontanus (A. Heller) C. P. Sm.	FABACEAE	INTERMONTANE LUPINE	native	
Lupinus rivularis Douglas ex Lindl.	FABACEAE		native	
Lupinus saxosus Howell	FABACEAE		native	
Lupinus sericatus Kellogg	FABACEAE	COBB MOUNTAIN LUPINE	native	
Lupinus shockleyi S. Watson	FABACEAE	DESERT LUPINE	native	
Lupinus sparsiflorus Benth.	FABACEAE	COULTER'S LUPINE	native	
Lupinus spectabilis Hoover	FABACEAE	SHAGGYHAIR LUPINE	native	
Lupinus stiversii Kellogg	FABACEAE	HARLEQUIN LUPINE	native	
Lupinus succulentus Douglas ex K. Koch	FABACEAE	ARROYO LUPINE	native	
Lupinus tidestromii Greene	FABACEAE	TIDESTROM'S LUPINE	native	
Lupinus tracyi Eastw.	FABACEAE	TRACY'S LUPINE	native	
Lupinus truncatus Nutt.	FABACEAE		native	
Lupinus uncialis S. Watson	FABACEAE	LILLIPUT LUPINE	native	
Lupinus variicolor Steud.	FABACEAE		native	
Luzula comosa E. Mey.	JUNCACEAE		native	
Luzula comosa E. Mey. var. comosa	JUNCACEAE		native	
Luzula comosa E. Mey. var. laxa Buchenau	JUNCACEAE		native	
Luzula divaricata S. Watson	JUNCACEAE		native	
Luzula orestera Sharsm.	JUNCACEAE		native	
Luzula parviflora (Ehrh.) Desv.	JUNCACEAE		native	
Luzula parviflora (Ehrh.) Desv. subsp. fastigiata (E. Mey.) Hämet-Ahti	JUNCACEAE		native	
Luzula parviflora (Ehrh.) Desv. subsp. parviflora	JUNCACEAE		native	
Luzula piperi (Coville) M. E. Jones	JUNCACEAE		native	
Luzula spicata (L.) DC.	JUNCACEAE		native	
Luzula subcongesta (S. Watson) Jeps.	JUNCACEAE		native	
Luzula subsessilis (S. Watson) Buchenau	JUNCACEAE		native	
Lychnis coronaria (L.) Desr.	CARYOPHYLLACEAE	ROSE CAMPION	naturalized	
Lycium andersonii A. Gray	SOLANACEAE		native	
Lycium barbarum L.	SOLANACEAE	MATRIMONY VINE	naturalized	
Lycium brevipes Benth.	SOLANACEAE		native	
Lycium brevipes Benth. var. brevipes	SOLANACEAE		native	
Lycium brevipes Benth. var. hassei (Greene) C. L. Hitchc.	SOLANACEAE	SANTA CATALINA ISLAND DESERT-THORN	native	
Lycium californicum Nutt.	SOLANACEAE	CALIFORNIA BOX-THORN	native	
Lycium cooperi A. Gray	SOLANACEAE		native	
Lycium ferocissimum Miers	SOLANACEAE		naturalized	acceptance uncertain
Lycium fremontii A. Gray	SOLANACEAE		native	
Lycium pallidum Miers	SOLANACEAE		native	
Lycium pallidum Miers var. oligospermum C. L. Hitchc.	SOLANACEAE		native	
Lycium parishii A. Gray	SOLANACEAE	PARISH'S DESERT-THORN	native	
Lycium torreyi A. Gray	SOLANACEAE		native	
Lycopersicon esculentum Mill.	SOLANACEAE	TOMATO	naturalized	
Lycopersicon peruvianum (L.) Mill.	SOLANACEAE		naturalized	
Lycopodiella inundata (L.) Holub	LYCOPODIACEAE	INUNDATED BOG CLUB-MOSS	native	
Lycopodium clavatum L.	LYCOPODIACEAE	RUNNING-PINE	native	
Lycopus americanus W. P. C. Barton	LAMIACEAE		native	
Lycopus asper Greene	LAMIACEAE		native	
Lycopus uniflorus Michx.	LAMIACEAE	NORTHERN BUGLEWEED	native	
Lyonothamnus floribundus A. Gray	ROSACEAE		native	
Lyonothamnus floribundus A. Gray subsp. aspleniifolius (Greene) P. H. Raven	ROSACEAE	SANTA CRUZ ISLAND IRONWOOD	native	
Lyonothamnus floribundus A. Gray subsp. floribundus	ROSACEAE	SANTA CATALINA ISLAND IRONWOOD	native	
Lyrocarpa coulteri Hook. & Harv.	BRASSICACEAE	COULTER'S LYREPOD	native	
Lysichiton americanus Hultén & H. St. John	ARACEAE	YELLOW SKUNK-CABBAGE	native	
Lysimachia nummularia L.	MYRSINACEAE	CREEPING-JENNY	naturalized	
Lysimachia thyrsiflora L.	MYRSINACEAE	TUFTED LOOSESTRIFE	native	
Lythrum californicum Torr. & A. Gray	LYTHRACEAE	CALIFORNIA LOOSESTRIFE	native	
Lythrum hyssopifolia L.	LYTHRACEAE		naturalized	
Lythrum portula (L.) D. A. Webb	LYTHRACEAE		naturalized	
Lythrum salicaria L.	LYTHRACEAE	PURPLE LOOSESTRIFE	naturalized	
Lythrum tribracteatum Salzm. ex Spreng.	LYTHRACEAE		naturalized	
Machaeranthera tanacetifolia (Kunth) Nees	ASTERACEAE		native	
Maclura pomifera (Raf.) C. K. Schneid.	MORACEAE		naturalized	
Madia anomala Greene	ASTERACEAE		native	
Madia citrigracilis D. D. Keck	ASTERACEAE		native	
Madia citriodora Greene	ASTERACEAE		native	
Madia elegans D. Don	ASTERACEAE	COMMON MADIA	native	
Madia exigua (Sm.) A. Gray	ASTERACEAE		native	
Madia glomerata Hook.	ASTERACEAE	MOUNTAIN TARWEED	native	
Madia gracilis (Sm.) D. D. Keck & J. C. Clausen ex Applegate	ASTERACEAE	GUMWEED	native	
Madia radiata Kellogg	ASTERACEAE	SHOWY GOLDEN MADIA	native	
Madia sativa Molina	ASTERACEAE	COAST TARWEED	native	
Madia subspicata D. D. Keck	ASTERACEAE		native	
Maianthemum dilatatum (Alph. Wood) A. Nelson & J. F. Macbr.	RUSCACEAE		native	
Maianthemum racemosum (L.) Link	RUSCACEAE		native	
Maianthemum stellatum (L.) Link	RUSCACEAE		native	
Malacothamnus abbottii (Eastw.) Kearney	MALVACEAE	ABBOTT'S BUSH-MALLOW	native	
Malacothamnus aboriginum (B. L. Rob.) Greene	MALVACEAE	INDIAN VALLEY BUSH-MALLOW	native	
Malacothamnus clementinus (Munz & I. M. Johnst.) Kearney	MALVACEAE	SAN CLEMENTE ISLAND BUSH-MALLOW	native	
Malacothamnus davidsonii (B. L. Rob.) Greene	MALVACEAE	DAVIDSON'S BUSH-MALLOW	native	
Malacothamnus densiflorus (S. Watson) Greene	MALVACEAE		native	
Malacothamnus fasciculatus (Nutt. ex Torr. & A. Gray) Greene	MALVACEAE	CHAPARRAL MALLOW	native	
Malacothamnus fasciculatus (Nutt. ex Torr. & A. Gray) Greene var. catalinensis (Eastw.) Kearney	MALVACEAE	SANTA CATALINA ISLAND BUSH-MALLOW	native	
Malacothamnus fasciculatus (Nutt. ex Torr. & A. Gray) Greene var. fasciculatus	MALVACEAE		native	
Malacothamnus fasciculatus (Nutt. ex Torr. & A. Gray) Greene var. nesioticus (B. L. Rob.) Kearney	MALVACEAE	SANTA CRUZ ISLAND BUSH-MALLOW	native	
Malacothamnus fasciculatus (Nutt. ex Torr. & A. Gray) Greene var. nuttallii (Abrams) Kearney	MALVACEAE		native	
Malacothamnus fremontii (Torr. ex A. Gray) Greene	MALVACEAE		native	
Malacothamnus hallii (Eastw.) Kearney	MALVACEAE	HALL'S BUSH-MALLOW	native	
Malacothamnus jonesii (Munz) Kearney	MALVACEAE	JONES' BUSH-MALLOW	native	
Malacothamnus marrubioides (Durand & Hilg.) Greene	MALVACEAE		native	
Malacothamnus orbiculatus (Greene) Greene	MALVACEAE		native	
Malacothamnus palmeri (S. Watson) Greene	MALVACEAE		native	
Malacothamnus palmeri (S. Watson) Greene var. involucratus (B. L. Rob.) Kearney	MALVACEAE	CARMEL VALLEY BUSH-MALLOW	native	
Malacothamnus palmeri (S. Watson) Greene var. palmeri	MALVACEAE	SANTA LUCIA BUSH-MALLOW	native	
Malacothrix californica DC.	ASTERACEAE		native	
Malacothrix clevelandii A. Gray	ASTERACEAE		native	
Malacothrix coulteri Harv. & A. Gray	ASTERACEAE	SNAKE'S-HEAD	native	
Malacothrix floccifera (DC.) S. F. Blake	ASTERACEAE		native	
Malacothrix foliosa A. Gray	ASTERACEAE		native	
Malacothrix foliosa A. Gray subsp. crispifolia W. S. Davis	ASTERACEAE	WAVY-LEAVED MALACOTHRIX	native	
Malacothrix foliosa A. Gray subsp. foliosa	ASTERACEAE	LEAFY MALACOTHRIX	native	
Malacothrix foliosa A. Gray subsp. philbrickii W. S. Davis	ASTERACEAE	PHILBRICK'S MALACOTHRIX	native	
Malacothrix foliosa A. Gray subsp. polycephala W. S. Davis	ASTERACEAE	MANY-HEADED MALACOTHRIX	native	
Malacothrix glabrata (A. Gray ex D. C. Eaton) A. Gray	ASTERACEAE	DESERT DANDELION	native	
Malacothrix incana (Nutt.) Torr. & A. Gray	ASTERACEAE	DUNEDELION	native	
Malacothrix indecora Greene	ASTERACEAE	SANTA CRUZ ISLAND MALACOTHRIX	native	
Malacothrix junakii W. S. Davis	ASTERACEAE	JUNAK'S MALACOTHRIX	native	
Malacothrix phaeocarpa W. S. Davis	ASTERACEAE	DUSKY-FRUITED MALACOTHRIX	native	
Malacothrix saxatilis (Nutt.) Torr. & A. Gray	ASTERACEAE		native	
Malacothrix saxatilis (Nutt.) Torr. & A. Gray var. arachnoidea (E. A. McGregor) E. W. Williams	ASTERACEAE	CARMEL VALLEY MALACOTHRIX	native	
Malacothrix saxatilis (Nutt.) Torr. & A. Gray var. commutata (Torr. & A. Gray) Ferris	ASTERACEAE		native	
Malacothrix saxatilis (Nutt.) Torr. & A. Gray var. implicata (Eastw.) H. M. Hall	ASTERACEAE		native	
Malacothrix saxatilis (Nutt.) Torr. & A. Gray var. saxatilis	ASTERACEAE	CLIFF MALACOTHRIX	native	
Malacothrix saxatilis (Nutt.) Torr. & A. Gray var. tenuifolia (Nutt.) A. Gray	ASTERACEAE		native	
Malacothrix similis W. S. Davis & P. H. Raven	ASTERACEAE	MEXICAN MALACOTHRIX	native	
Malacothrix sonchoides (Nutt.) Torr. & A. Gray	ASTERACEAE		native	
Malacothrix squalida Greene	ASTERACEAE	ISLAND MALACOTHRIX	native	
Malacothrix stebbinsii W. S. Davis & P. H. Raven	ASTERACEAE		native	
Malacothrix torreyi A. Gray	ASTERACEAE		native	
Malaxis monophyllos (L.) Sw.	ORCHIDACEAE		native	
Malaxis monophyllos (L.) Sw. var. brachypoda (A. Gray) F. Morris & E. A. Eames	ORCHIDACEAE	WHITE BOG ADDER'S-MOUTH	native	
Malcolmia graeca Boiss. & Spruner	BRASSICACEAE		naturalized	acceptance uncertain
Malephora crocea (Jacq.) Schwantes	AIZOACEAE		naturalized	
Malosma laurina (Nutt.) Nutt. ex Abrams	ANACARDIACEAE	LAUREL SUMAC	native	
Malperia tenuis S. Watson	ASTERACEAE	BROWN TURBANS	native	
Malus fusca (Raf.) C. K. Schneid.	ROSACEAE	OREGON CRAB APPLE	native	
Malus pumila Mill.	ROSACEAE	APPLE	naturalized	
Malva arborea (L.) Webb & Berthel.	MALVACEAE	TREE MALLOW	naturalized	
Malva assurgentiflora (Kellogg) M.F. Ray	MALVACEAE	ISLAND MALLOW	native	
Malva neglecta Wallr.	MALVACEAE	COMMON MALLOW	naturalized	
Malva nicaeensis All.	MALVACEAE	BULL MALLOW	naturalized	
Malva parviflora L.	MALVACEAE	LITTLE MALLOW	naturalized	
Malva pseudolavatera Webb. & Berthel.	MALVACEAE	CRETAN MALLOW	naturalized	
Malva sylvestris L.	MALVACEAE	HIGH MALLOW	naturalized	
Malvella leprosa (Ortega) Krapov.	MALVACEAE	WHITE-WEED	native	
Mammillaria dioica K. Brandegee	CACTACEAE		native	
Mammillaria grahamii Engelm.	CACTACEAE		native	
Mammillaria grahamii Engelm. var. grahamii	CACTACEAE	GRAHAM'S FISHHOOK CACTUS	native	
Mammillaria tetrancistra Engelm.	CACTACEAE		native	
Marah fabacea (Naudin) Greene	CUCURBITACEAE	CALIFORNIA MAN-ROOT	native	
Marah horrida (Congdon) Dunn	CUCURBITACEAE	SIERRA MAN-ROOT	native	
Marah macrocarpa (Greene) Greene	CUCURBITACEAE	CHILICOTHE	native	
Marah oregana (Torr. ex S. Watson) Howell	CUCURBITACEAE	COAST MAN-ROOT	native	
Marah watsonii (Cogn.) Greene	CUCURBITACEAE	TAW MAN-ROOT	native	
Marina orcuttii (S. Watson) Barneby	FABACEAE		native	
Marina orcuttii (S. Watson) Barneby var. orcuttii	FABACEAE	CALIFORNIA MARINA	native	
Marina parryi (Torr. & A. Gray) Barneby	FABACEAE		native	
Marrubium vulgare L.	LAMIACEAE		naturalized	
Marsilea oligospora Goodd.	MARSILEACEAE		native	
Marsilea vestita Hook. & Grev.	MARSILEACEAE		native	
Marsilea vestita Hook. & Grev. subsp. vestita	MARSILEACEAE		native	
Matelea parvifolia (Torr.) Woodson	APOCYNACEAE	SPEARLEAF	native	
Matricaria chamomilla L.	ASTERACEAE	GERMAN CHAMOMILE	naturalized	
Matricaria discoidea DC.	ASTERACEAE	RAYLESS CHAMOMILE	naturalized	
Matricaria occidentalis Greene	ASTERACEAE	VALLEY MAYWEED	native	
Matthiola incana (L.) W. T. Aiton	BRASSICACEAE		naturalized	
Maurandella antirrhiniflora (Humb. & Bonpl. ex Willd.) Rothm.	PLANTAGINACEAE	VIOLET TWINING SNAPDRAGON	native	
Maytenus boaria Molina	CELASTRACEAE	MAITEN TREE	naturalized	
Meconella californica Torr. & Frém.	PAPAVERACEAE		native	
Meconella denticulata Greene	PAPAVERACEAE		native	
Meconella oregana Nutt.	PAPAVERACEAE	OREGON MECONELLA	native	
Medicago arabica (L.) Huds.	FABACEAE	SPOTTED BURCLOVER	naturalized	
Medicago lupulina L.	FABACEAE	BLACK MEDICK	naturalized	
Medicago minima (L.) Bartal.	FABACEAE	BURCLOVER	naturalized	
Medicago polymorpha L.	FABACEAE	CALIFORNIA BURCLOVER	naturalized	
Medicago praecox DC.	FABACEAE		naturalized	
Medicago rigidula (L.) All.	FABACEAE	TIFTON BURCLOVER	naturalized	
Medicago sativa L.	FABACEAE	ALFALFA	naturalized	
Medicago scutellata (L.) Mill.	FABACEAE	SNAIL MEDICK	naturalized	
Medicago truncatula Gaertn.	FABACEAE	BARREL CLOVER	naturalized	
Melaleuca viminalis (Sol. ex Gaertn.) Bymes	MYRTACEAE	WEEPING BOTTLEBRUSH	naturalized	
Melia azedarach L.	MELIACEAE	PERSIAN LILAC	naturalized	
Melica aristata Thurb. ex Bol.	POACEAE	AWNED MELIC	native	
Melica bulbosa Geyer ex Porter & J.M. Coult.	POACEAE	ONIONGRASS	native	
Melica californica Scribn.	POACEAE	CALIFORNIA MELIC	native	
Melica frutescens Scribn.	POACEAE	WOODY MELIC	native	
Melica fugax Bol.	POACEAE	LITTLE MELIC	native	
Melica geyeri Munro	POACEAE	GEYER'S ONIONGRASS	native	
Melica harfordii Bol.	POACEAE		native	
Melica imperfecta Trin.	POACEAE	LITTLE CALIFORNIA MELICA	native	
Melica spectabilis Scribn.	POACEAE	PURPLE ONIONGRASS	native	
Melica stricta Bol.	POACEAE	ROCK MELIC	native	
Melica subulata (Griseb.) Scribn.	POACEAE	ALASKAN ONIONGRASS	native	
Melica torreyana Scribn.	POACEAE	TORREY'S MELIC	native	
Melilotus albus Medik.	FABACEAE	WHITE SWEETCLOVER	naturalized	
Melilotus indicus (L.) All.	FABACEAE	SOURCLOVER	naturalized	
Melilotus officinalis Lam.	FABACEAE	YELLOW SWEETCLOVER	naturalized	
Melinis repens (Willd.) Zizka	POACEAE		naturalized	
Melinis repens (Willd.) Zizka subsp. repens	POACEAE	RUBY GRASS	naturalized	
Melissa officinalis L.	LAMIACEAE	LEMON BALM	naturalized	
Menodora scabra A. Gray	OLEACEAE	ROUGH MENODORA	native	
Menodora scabra A. Gray var. glabrescens A. Gray	OLEACEAE		native	
Menodora scabra A. Gray var. scabra	OLEACEAE		native	
Menodora spinescens A. Gray	OLEACEAE		native	
Menodora spinescens A. Gray var. mohavensis Steyerm.	OLEACEAE		native	
Menodora spinescens A. Gray var. spinescens	OLEACEAE		native	
Mentha X gracilis Sole	LAMIACEAE	SCOTCH SPEARMINT	naturalized	
Mentha X piperita L.	LAMIACEAE	PEPPERMINT	naturalized	
Mentha X rotundifolia (L.) Huds.	LAMIACEAE	APPLE MINT	naturalized	
Mentha X smithiana R.A. Graham	LAMIACEAE	REDSTEM MINT	naturalized	
Mentha X villosa Huds.	LAMIACEAE	APPLE MINT	naturalized	
Mentha aquatica L.	LAMIACEAE	WATERMINT	naturalized	
Mentha arvensis L.	LAMIACEAE	FIELD MINT	naturalized	
Mentha canadensis L.	LAMIACEAE	JAPANESE PEPPERMINT	native	
Mentha longifolia (L.) L.	LAMIACEAE		naturalized	
Mentha pulegium L.	LAMIACEAE	PENNYROYAL	naturalized	
Mentha spicata L.	LAMIACEAE	SPEARMINT	naturalized	
Mentha suaveolens Ehrh.	LAMIACEAE	PINEAPPLE MINT	naturalized	
Mentzelia affinis Greene	LOASACEAE		native	
Mentzelia albicaulis (Douglas) Douglas ex Torr. & A. Gray	LOASACEAE		native	
Mentzelia congesta Torr. & A. Gray	LOASACEAE		native	
Mentzelia crocea Kellogg	LOASACEAE		native	
Mentzelia desertorum (Davidson) H. J. Thomps. & J. E. Roberts	LOASACEAE		native	
Mentzelia dispersa S. Watson	LOASACEAE		native	
Mentzelia eremophila (Jeps.) H. J. Thomps. & J. E. Roberts	LOASACEAE	SOLITARY BLAZING STAR	native	
Mentzelia gracilenta Torr. & A. Gray	LOASACEAE		native	
Mentzelia hirsutissima S. Watson	LOASACEAE	HAIRY STICKLEAF	native	
Mentzelia involucrata S. Watson	LOASACEAE		native	
Mentzelia inyoensis H. J. Thomps. & Prigge	LOASACEAE	INYO BLAZING STAR	native	
Mentzelia jonesii (Urb. & Gilg) H. J. Thomps. & J. E. Roberts	LOASACEAE		native	
Mentzelia laevicaulis (Hook.) Torr. & A. Gray	LOASACEAE		native	
Mentzelia lindleyi Torr. & A. Gray	LOASACEAE		native	
Mentzelia longiloba J. Darl.	LOASACEAE		native	
Mentzelia micrantha (Hook. & Arn.) Torr. & A. Gray	LOASACEAE		native	
Mentzelia montana Davidson	LOASACEAE		native	
Mentzelia nitens Greene	LOASACEAE		native	
Mentzelia obscura H. J. Thomps. & J. E. Roberts	LOASACEAE		native	
Mentzelia oreophila J. Darl.	LOASACEAE		native	
Mentzelia pectinata Kellogg	LOASACEAE		native	
Mentzelia polita A. Nelson	LOASACEAE	POLISHED BLAZING STAR	native	
Mentzelia pterosperma Eastw.	LOASACEAE	WING-SEED BLAZING STAR	native	
Mentzelia ravenii H. J. Thomps. & J. E. Roberts	LOASACEAE		native	
Mentzelia reflexa Coville	LOASACEAE		native	
Mentzelia torreyi A. Gray	LOASACEAE	TORREY'S BLAZING STAR	native	
Mentzelia tricuspis A. Gray	LOASACEAE	SPINY-HAIR BLAZING STAR	native	
Mentzelia tridentata (Davidson) H. J. Thomps. & J. E. Roberts	LOASACEAE	CREAMY BLAZING STAR	native	
Mentzelia veatchiana Kellogg	LOASACEAE		native	
Menyanthes trifoliata L.	MENYANTHACEAE		native	
Menziesia ferruginea Sm.	ERICACEAE	MOCK AZALEA	native	
Mercurialis annua L.	EUPHORBIACEAE		naturalized	
Mertensia bella Piper	BORAGINACEAE	OREGON LUNGWORT	native	
Mertensia ciliata (Torr.) G. Don	BORAGINACEAE		native	
Mertensia ciliata (Torr.) G. Don var. stomatechoides (Kellogg) Jeps.	BORAGINACEAE	STREAMSIDE BLUEBELL	native	
Mertensia cusickii Piper	BORAGINACEAE	TOIYABE BLUEBELLS	native	
Mertensia longiflora Greene	BORAGINACEAE	LONG BLUEBELLS	native	
Mertensia oblongifolia (Nutt.) G. Don	BORAGINACEAE	SAGEBRUSH BLUEBELL	native	
Mertensia oblongifolia (Nutt.) G. Don var. amoena (A. Nelson) L. O. Williams	BORAGINACEAE	BEAUTIFUL SAGEBRUSH BLUEBELLS	native	
Mertensia oblongifolia (Nutt.) G. Don var. nevadensis (A. Nelson) L. O. Williams	BORAGINACEAE		native	
Mertensia oblongifolia (Nutt.) G. Don var. oblongifolia	BORAGINACEAE	SAGEBRUSH BLUEBELLS	native	
Mesembryanthemum crystallinum L.	AIZOACEAE	CRYSTALLINE ICEPLANT	naturalized	
Mesembryanthemum nodiflorum L.	AIZOACEAE	SLENDER-LEAVED ICEPLANT	naturalized	
Micranthes aprica (Greene) Small	SAXIFRAGACEAE		native	
Micranthes bryophora (A. Gray) Brouillet & Gornall	SAXIFRAGACEAE		native	
Micranthes californica (Greene) Small	SAXIFRAGACEAE		native	
Micranthes ferruginea (Graham) Brouillet & Gornall	SAXIFRAGACEAE		native	
Micranthes fragosa (Suksd. ex Small) Small	SAXIFRAGACEAE		native	
Micranthes howellii (Greene) Small	SAXIFRAGACEAE	HOWELL'S SAXIFRAGE	native	
Micranthes integrifolia (Hook.) Small	SAXIFRAGACEAE		native	
Micranthes marshallii (Greene) Small	SAXIFRAGACEAE		native	
Micranthes nidifica (Greene) Small	SAXIFRAGACEAE		native	
Micranthes odontoloma (Piper) A. Heller	SAXIFRAGACEAE		native	
Micranthes oregana (Howell) Small	SAXIFRAGACEAE		native	
Micranthes tolmiei (Torr. & A. Gray) Brouillet & Gornall	SAXIFRAGACEAE		native	
Micromonolepis pusilla (Torr. ex S. Watson) Ulbr.	CHENOPODIACEAE	DWARF MONOLEPIS	native	
Micropus amphibolus A. Gray	ASTERACEAE	MOUNT DIABLO COTTONSEED	native	
Micropus californicus Fisch. & C. A. Mey.	ASTERACEAE		native	
Micropus californicus Fisch. & C. A. Mey. var. californicus	ASTERACEAE	COTTONTOP	native	
Micropus californicus Fisch. & C. A. Mey. var. subvestitus A. Gray	ASTERACEAE		native	
Microseris acuminata Greene	ASTERACEAE		native	
Microseris bigelovii (A. Gray) Sch. Bip.	ASTERACEAE		native	
Microseris borealis (Bong.) Sch. Bip.	ASTERACEAE	NORTHERN MICROSERIS	native	
Microseris campestris Greene	ASTERACEAE		native	
Microseris douglasii (DC.) Sch. Bip.	ASTERACEAE		native	
Microseris douglasii (DC.) Sch. Bip. subsp. douglasii	ASTERACEAE		native	
Microseris douglasii (DC.) Sch. Bip. subsp. platycarpha (A. Gray) K. L. Chambers	ASTERACEAE	SMALL-FLOWERED MICROSERIS	native	
Microseris douglasii (DC.) Sch. Bip. subsp. tenella (A. Gray) K. L. Chambers	ASTERACEAE		native	
Microseris elegans Greene ex A. Gray	ASTERACEAE		native	
Microseris laciniata (Hook.) Sch. Bip.	ASTERACEAE		native	
Microseris laciniata (Hook.) Sch. Bip. subsp. detlingii K. L. Chambers	ASTERACEAE	DETLING'S SILVERPUFFS	native	
Microseris laciniata (Hook.) Sch. Bip. subsp. laciniata	ASTERACEAE		native	
Microseris laciniata (Hook.) Sch. Bip. subsp. leptosepala (Nutt.) K. L. Chambers	ASTERACEAE		native	
Microseris laciniata (Hook.) Sch. Bip. subsp. siskiyouensis K. L. Chambers	ASTERACEAE		native	
Microseris nutans (Hook.) Sch. Bip.	ASTERACEAE		native	
Microseris paludosa (Greene) J. T. Howell	ASTERACEAE	MARSH MICROSERIS	native	
Microseris sylvatica (Benth.) Sch. Bip.	ASTERACEAE	SYLVAN MICROSERIS	native	
Microsteris gracilis (Hook.) Greene	POLEMONIACEAE		native	
Mimulus alsinoides Benth.	PHRYMACEAE		native	
Mimulus androsaceus Greene	PHRYMACEAE		native	
Mimulus angustatus (A. Gray) A. Gray	PHRYMACEAE		native	
Mimulus aurantiacus Curtis	PHRYMACEAE		native	
Mimulus aurantiacus Curtis var. aridus (Abrams) D. M. Thomps.	PHRYMACEAE		native	
Mimulus aurantiacus Curtis var. aurantiacus	PHRYMACEAE		native	
Mimulus aurantiacus Curtis var. grandiflorus (Lindl. & Paxton) D. M. Thomps.	PHRYMACEAE		native	
Mimulus aurantiacus Curtis var. parviflorus (Greene) D. M. Thomps.	PHRYMACEAE		native	
Mimulus aurantiacus Curtis var. pubescens (Torr.) D. M. Thomps.	PHRYMACEAE		native	
Mimulus aurantiacus Curtis var. puniceus (Nutt.) D. M. Thomps.	PHRYMACEAE		native	
Mimulus bicolor Benth.	PHRYMACEAE		native	
Mimulus bigelovii (A. Gray) A. Gray	PHRYMACEAE		native	
Mimulus bigelovii (A. Gray) A. Gray var. bigelovii	PHRYMACEAE		native	
Mimulus bigelovii (A. Gray) A. Gray var. cuspidatus A. L. Grant	PHRYMACEAE		native	
Mimulus bolanderi A. Gray	PHRYMACEAE		native	
Mimulus breviflorus Piper	PHRYMACEAE		native	
Mimulus brevipes Benth.	PHRYMACEAE		native	
Mimulus breweri (Greene) Coville	PHRYMACEAE		native	
Mimulus cardinalis Benth.	PHRYMACEAE		native	
Mimulus clevelandii Brandegee	PHRYMACEAE	CLEVELAND'S BUSH MONKEYFLOWER	native	
Mimulus congdonii B. L. Rob.	PHRYMACEAE		native	
Mimulus constrictus (A. L. Grant) Pennell	PHRYMACEAE		native	
Mimulus cusickii (Greene) Rattan	PHRYMACEAE	CUSICK'S MONKEYFLOWER	native	
Mimulus dentatus Nutt. ex Benth.	PHRYMACEAE		native	
Mimulus douglasii (Benth.) A. Gray	PHRYMACEAE		native	
Mimulus evanescens Meinke	PHRYMACEAE	EPHEMERAL MONKEYFLOWER	native	
Mimulus exiguus A. Gray	PHRYMACEAE	SAN BERNARDINO MOUNTAINS MONKEYFLOWER	native	
Mimulus filicaulis S. Watson	PHRYMACEAE	SLENDER-STEMMED MONKEYFLOWER	native	
Mimulus floribundus Lindl.	PHRYMACEAE		native	
Mimulus fremontii (Benth.) A. Gray	PHRYMACEAE		native	
Mimulus fremontii (Benth.) A. Gray var. fremontii	PHRYMACEAE		native	
Mimulus fremontii (Benth.) A. Gray var. vandenbergensis D. M. Thomps.	PHRYMACEAE	VANDENBERG MONKEYFLOWER	native	
Mimulus glaucescens Greene	PHRYMACEAE	SHIELD-BRACTED MONKEYFLOWER	native	
Mimulus gracilipes B. L. Rob.	PHRYMACEAE	SLENDER-STALKED MONKEYFLOWER	native	
Mimulus guttatus DC.	PHRYMACEAE		native	
Mimulus inconspicuus A. Gray	PHRYMACEAE	SMALL-FLOWERED MONKEYFLOWER	native	
Mimulus johnstonii A. L. Grant	PHRYMACEAE	JOHNSTON'S MONKEYFLOWER	native	
Mimulus kelloggii (Curran ex Greene) Curran ex A. Gray	PHRYMACEAE		native	
Mimulus laciniatus A. Gray	PHRYMACEAE	CUT-LEAVED MONKEYFLOWER	native	
Mimulus latidens (A. Gray) Greene	PHRYMACEAE		native	
Mimulus layneae (Greene) Jeps.	PHRYMACEAE		native	
Mimulus leptaleus A. Gray	PHRYMACEAE		native	
Mimulus lewisii Pursh	PHRYMACEAE		native	
Mimulus mohavensis Lemmon	PHRYMACEAE	MOJAVE MONKEYFLOWER	native	
Mimulus montioides A. Gray	PHRYMACEAE		native	
Mimulus moschatus Douglas ex Lindl.	PHRYMACEAE	MUSK MONKEYFLOWER	native	
Mimulus nanus Hook. & Arn.	PHRYMACEAE		native	
Mimulus nanus Hook. & Arn. var. jepsonii (A. L. Grant) D. M. Thomps.	PHRYMACEAE		native	
Mimulus nanus Hook. & Arn. var. mephiticus (Greene) D. M. Thomps.	PHRYMACEAE		native	
Mimulus nanus Hook. & Arn. var. nanus	PHRYMACEAE		native	
Mimulus norrisii Heckard & Shevock	PHRYMACEAE	KAWEAH MONKEYFLOWER	native	
Mimulus nudatus Curran ex Greene	PHRYMACEAE	BARE MONKEYFLOWER	native	
Mimulus palmeri A. Gray	PHRYMACEAE		native	
Mimulus parishii Greene	PHRYMACEAE		native	
Mimulus parryi A. Gray	PHRYMACEAE	PARRY'S MONKEYFLOWER	native	
Mimulus pictus (Curran ex Greene) A. Gray	PHRYMACEAE	CALICO MONKEYFLOWER	native	
Mimulus pilosus (Benth.) S. Watson	PHRYMACEAE		native	
Mimulus primuloides Benth.	PHRYMACEAE		native	
Mimulus primuloides Benth. var. linearifolius A. L. Grant	PHRYMACEAE		native	
Mimulus primuloides Benth. var. primuloides	PHRYMACEAE		native	
Mimulus pulchellus (Drew ex Greene) A. L. Grant	PHRYMACEAE	YELLOW-LIP PANSY MONKEYFLOWER	native	
Mimulus pulsiferae A. Gray	PHRYMACEAE		native	
Mimulus purpureus A. L. Grant	PHRYMACEAE	LITTLE PURPLE MONKEYFLOWER	native	
Mimulus pygmaeus A. L. Grant	PHRYMACEAE	EGG LAKE MONKEYFLOWER	native	
Mimulus rattanii A. Gray	PHRYMACEAE		native	
Mimulus ringens L.	PHRYMACEAE		native	
Mimulus rubellus A. Gray	PHRYMACEAE		native	
Mimulus rupicola Coville & A. L. Grant	PHRYMACEAE	DEATH VALLEY MONKEYFLOWER	native	
Mimulus shevockii Heckard & Bacig.	PHRYMACEAE	KELSO CREEK MONKEYFLOWER	native	
Mimulus suksdorfii A. Gray	PHRYMACEAE		native	
Mimulus tilingii Regel	PHRYMACEAE		native	
Mimulus torreyi A. Gray	PHRYMACEAE		native	
Mimulus tricolor Hartw. ex Lindl.	PHRYMACEAE		native	
Mimulus viscidus Congdon	PHRYMACEAE		native	
Mimulus viscidus Congdon var. compactus D. M. Thomps.	PHRYMACEAE		native	
Mimulus viscidus Congdon var. viscidus	PHRYMACEAE		native	
Mimulus whitneyi A. Gray	PHRYMACEAE		native	
Minuartia californica (A. Gray) Mattf.	CARYOPHYLLACEAE	CALIFORNIA SANDWORT	native	
Minuartia cismontana Meinke & Zika	CARYOPHYLLACEAE	CISMONTANE MINUARTIA	native	
Minuartia decumbens T. W. Nelson & J. P. Nelson	CARYOPHYLLACEAE	THE LASSICS SANDWORT	native	
Minuartia douglasii (Fenzl ex Torr. & A. Gray) Mattf.	CARYOPHYLLACEAE	DOUGLAS' STITCHWORT	native	
Minuartia howellii (S. Watson) Mattf.	CARYOPHYLLACEAE	HOWELL'S SANDWORT	native	
Minuartia nuttallii (Pax) Briq.	CARYOPHYLLACEAE	NUTTALL'S SANDWORT	native	
Minuartia nuttallii (Pax) Briq. var. fragilis (Maguire & A. H. Holmgren) Rabeler & R. L. Hartm.	CARYOPHYLLACEAE		native	
Minuartia nuttallii (Pax) Briq. var. gracilis (B. L. Rob) Rabeler & R. L. Hartm.	CARYOPHYLLACEAE		native	
Minuartia nuttallii (Pax) Briq. var. gregaria (A. Heller) Rabeler & R. L. Hartm.	CARYOPHYLLACEAE		native	
Minuartia obtusiloba (Rydb.) House	CARYOPHYLLACEAE	ALPINE SANDWORT	native	
Minuartia pusilla (S. Watson) Mattf.	CARYOPHYLLACEAE	ANNUAL SANDWORT	native	
Minuartia rosei (Maguire & Barneby) McNeill	CARYOPHYLLACEAE	PEANUT SANDWORT	native	
Minuartia rubella (Wahlenb.) Hiern	CARYOPHYLLACEAE	REDDISH SANDWORT	native	
Minuartia stolonifera T. W. Nelson & J. P. Nelson	CARYOPHYLLACEAE	SCOTT MOUNTAIN SANDWORT	native	
Minuartia stricta (Sw.) Hiern	CARYOPHYLLACEAE	BOG SANDWORT	native	
Mirabilis albida (Walter) Heimerl	NYCTAGINACEAE		native	
Mirabilis alipes (S. Watson) Pilz	NYCTAGINACEAE		native	
Mirabilis coccinea (Torr.) Benth. & Hook. f.	NYCTAGINACEAE	RED FOUR O'CLOCK	native	
Mirabilis greenei S. Watson	NYCTAGINACEAE	GREENE'S FOUR O'CLOCK	native	
Mirabilis jalapa L.	NYCTAGINACEAE		naturalized	
Mirabilis jalapa L. var. jalapa	NYCTAGINACEAE		naturalized	
Mirabilis laevis (Benth.) Curran	NYCTAGINACEAE		native	
Mirabilis laevis (Benth.) Curran var. crassifolia (Choisy) Spellenb.	NYCTAGINACEAE	WISHBONE BUSH	native	
Mirabilis laevis (Benth.) Curran var. retrorsa (A. Heller) Jeps.	NYCTAGINACEAE		native	
Mirabilis laevis (Benth.) Curran var. villosa (Kellogg) Spellenb.	NYCTAGINACEAE		native	
Mirabilis linearis (Pursh) Heimerl	NYCTAGINACEAE		naturalized	
Mirabilis linearis (Pursh) Heimerl var. linearis	NYCTAGINACEAE		naturalized	
Mirabilis multiflora (Torr.) A. Gray	NYCTAGINACEAE		native	
Mirabilis multiflora (Torr.) A. Gray var. glandulosa (Standl.) J. F. Macbr.	NYCTAGINACEAE		native	
Mirabilis multiflora (Torr.) A. Gray var. pubescens S. Watson	NYCTAGINACEAE		native	
Mirabilis tenuiloba S. Watson	NYCTAGINACEAE	SLENDER-LOBED FOUR O'CLOCK	native	
Mitellastra caulescens (Nutt.) Howell	SAXIFRAGACEAE		native	
Modiola caroliniana (L.) G. Don	MALVACEAE	MODIOLA	naturalized	
Moehringia macrophylla (Hook.) Fenzl	CARYOPHYLLACEAE	LARGE-LEAVED SANDWORT	native	
Moenchia erecta (L.) P. Gaertn., B. Mey. & Scherb.	CARYOPHYLLACEAE		naturalized	
Moenchia erecta (L.) P. Gaertn., B. Mey. & Scherb. subsp. erecta	CARYOPHYLLACEAE	UPRIGHT CHICKWEED	naturalized	
Mohavea breviflora Coville	PLANTAGINACEAE		native	
Mohavea confertiflora (Benth. ex A. DC.) A. Heller	PLANTAGINACEAE	GHOST FLOWER	native	
Mollugo cerviana (L.) Ser.	MOLLUGINACEAE		naturalized	
Mollugo verticillata L.	MOLLUGINACEAE		naturalized	
Monarda pectinata Nutt.	LAMIACEAE	PLAINS BEE BALM	native	
Monardella australis Abrams	LAMIACEAE		native	
Monardella australis Abrams subsp. australis	LAMIACEAE		native	
Monardella australis Abrams subsp. cinerea (Abrams) A.C. Sanders & Elvin	LAMIACEAE	GRAY MONARDELLA	native	
Monardella australis Abrams subsp. jokerstii Elvin & A.C. Sanders	LAMIACEAE	JOKERST'S MONARDELLA	native	
Monardella beneolens Shevock, Ertter, & Jokerst	LAMIACEAE	SWEET-SMELLING MONARDELLA	native	
Monardella boydii	LAMIACEAE		native	
Monardella breweri A. Gray	LAMIACEAE		native	
Monardella breweri A. Gray subsp. breweri	LAMIACEAE		native	
Monardella breweri A. Gray subsp. glandulifera (I.M. Johnst.) Elvin	LAMIACEAE		native	
Monardella breweri A. Gray subsp. lanceolata (A. Gray) A.C. Sanders & Elvin	LAMIACEAE	MUSTANG MINT	native	
Monardella breweri A. Gray subsp. microcephala (A. Gray) Elvin & A.C. Sanders	LAMIACEAE		native	
Monardella candicans Benth.	LAMIACEAE	SIERRA MONARDELLA	native	
Monardella douglasii Benth.	LAMIACEAE		native	
Monardella eremicola A.C. Sanders & Elvin	LAMIACEAE		native	
Monardella exilis (A. Gray) Greene	LAMIACEAE		native	
Monardella follettii (Jeps.) Jokerst	LAMIACEAE	FOLLETT'S MONARDELLA	native	
Monardella hypoleuca A. Gray	LAMIACEAE		native	
Monardella hypoleuca A. Gray subsp. hypoleuca	LAMIACEAE		native	
Monardella hypoleuca A. Gray subsp. intermedia A.C. Sanders & Elvin	LAMIACEAE		native	
Monardella hypoleuca A. Gray subsp. lanata (Abrams) Munz	LAMIACEAE	FELT-LEAVED MONARDELLA	native	
Monardella lanceolata A. Gray	LAMIACEAE		native	
Monardella linoides A. Gray	LAMIACEAE		native	
Monardella linoides A. Gray subsp. anemonoides (Greene) Elvin & A.C. Sanders	LAMIACEAE		native	
Monardella linoides A. Gray subsp. erecta (Abrams) Elvin & A.C. Sanders	LAMIACEAE		native	
Monardella linoides A. Gray subsp. linoides	LAMIACEAE		native	
Monardella linoides A. Gray subsp. oblonga (Greene) Abrams	LAMIACEAE	TEHACHAPI MONARDELLA	native	
Monardella linoides A. Gray subsp. sierrae Elvin & A.C. Sanders	LAMIACEAE		native	
Monardella macrantha A. Gray	LAMIACEAE		native	
Monardella macrantha A. Gray subsp. hallii (Abrams) Abrams	LAMIACEAE	HALL'S MONARDELLA	native	
Monardella macrantha A. Gray subsp. macrantha	LAMIACEAE		native	
Monardella mojavensis Elvin & A.C. Sanders	LAMIACEAE		native	
Monardella nana A. Gray	LAMIACEAE		native	
Monardella odoratissima Benth.	LAMIACEAE	COYOTE-MINT	native	
Monardella odoratissima Benth. subsp. glauca (Greene) Epling	LAMIACEAE		native	
Monardella odoratissima Benth. subsp. pallida (A. Heller) Epling	LAMIACEAE		native	
Monardella palmeri A. Gray	LAMIACEAE	PALMER'S MONARDELLA	native	
Monardella purpurea Howell	LAMIACEAE	SISKIYOU MONARDELLA	native	
Monardella robisonii Epling ex Munz	LAMIACEAE	ROBISON'S MONARDELLA	native	
Monardella saxicola I.M. Johnst.	LAMIACEAE	ROCK MONARDELLA	native	
Monardella sheltonii Torr.	LAMIACEAE		native	
Monardella sinuata Elvin & A.C. Sanders	LAMIACEAE		native	
Monardella sinuata Elvin & A.C. Sanders subsp. nigrescens Elvin & A.C. Sanders	LAMIACEAE		native	
Monardella sinuata Elvin & A.C. Sanders subsp. sinuata	LAMIACEAE		native	
Monardella stebbinsii Hardham & Bartel	LAMIACEAE	STEBBINS' MONARDELLA	native	
Monardella stoneana Elvin & A. C.Sanders	LAMIACEAE	JENNIFER'S MONARDELLA	native	
Monardella undulata Benth.	LAMIACEAE		native	
Monardella undulata Benth. subsp. arguelloensis Elvin & A.C. Sanders	LAMIACEAE		native	
Monardella undulata Benth. subsp. crispa (Elmer) Elvin & A.C. Sanders	LAMIACEAE	CRISP MONARDELLA	native	
Monardella undulata Benth. subsp. undulata	LAMIACEAE	SAN LUIS OBISPO MONARDELLA	native	
Monardella venosa (Torr.) A.C. Sanders & Elvin	LAMIACEAE	VEINY MONARDELLA	native	
Monardella villosa Benth.	LAMIACEAE	COYOTE-MINT	native	
Monardella villosa Benth. subsp. franciscana (Elmer) Jokerst	LAMIACEAE		native	
Monardella villosa Benth. subsp. obispoensis (Hoover ex Jeps.) Jokerst	LAMIACEAE		native	
Monardella villosa Benth. subsp. villosa	LAMIACEAE		native	
Monardella viminea Greene	LAMIACEAE	WILLOWY MONARDELLA	native	
Monardella viridis Jeps.	LAMIACEAE	GREEN MONARDELLA	native	
Moneses uniflora (L.) A. Gray	ERICACEAE	WOODNYMPH	native	
Monochoria vaginalis (Burm. f.) C. Presl ex Kunth	PONTEDERIACEAE		naturalized	
Monolepis nuttalliana (Schult.) Greene	CHENOPODIACEAE	NUTTALL'S POVERTY WEED	native	
Monolepis spathulata A. Gray	CHENOPODIACEAE		native	
Monolopia congdonii (A. Gray) B. G. Baldwin	ASTERACEAE	SAN JOAQUIN WOOLLYTHREADS	native	
Monolopia gracilens A. Gray	ASTERACEAE	WOODLAND WOOLLYTHREADS	native	
Monolopia lanceolata Nutt.	ASTERACEAE	COMMON HILLSIDE DAISY	native	
Monolopia major DC.	ASTERACEAE		native	
Monolopia stricta Crum	ASTERACEAE		native	
Monoptilon bellidiforme Torr. & A. Gray	ASTERACEAE		native	
Monoptilon bellioides (A. Gray) H. M. Hall	ASTERACEAE		native	
Monotropa hypopitys L.	ERICACEAE	PINESAP	native	
Monotropa uniflora L.	ERICACEAE	GHOST-PIPE	native	
Montia chamissoi (Spreng.) Greene	MONTIACEAE	TOAD LILY	native	
Montia dichotoma (Nutt.) Howell	MONTIACEAE		native	
Montia diffusa (Nutt.) Greene	MONTIACEAE		native	
Montia fontana L.	MONTIACEAE	BLINKS	native	
Montia howellii S. Watson	MONTIACEAE	HOWELL'S MONTIA	native	
Montia linearis (Hook.) Greene	MONTIACEAE		native	
Montia parvifolia (DC.) Greene	MONTIACEAE		native	
Morella californica (Cham. & Schltdl.) Wilbur	MYRICACEAE	WAX MYRTLE	native	
Mortonia utahensis (Trel.) A. Nelson	CELASTRACEAE	UTAH MORTONIA	native	
Morus alba L.	MORACEAE	WHITE MULBERRY	naturalized	
Mucronea californica Benth.	POLYGONACEAE	CALIFORNIA SPINEFLOWER	native	
Mucronea perfoliata (A. Gray) A. Heller	POLYGONACEAE	PERFOLIATE SPINEFLOWER	native	
Muehlenbeckia complexa (A. Cunn.) Meisn.	POLYGONACEAE	MAIDENHAIR VINE	naturalized	
Muehlenbeckia hastulata (Sm.) I. M. Johnst.	POLYGONACEAE	WIREVINE	naturalized	
Muehlenbeckia hastulata (Sm.) I. M. Johnst. var. hastulata	POLYGONACEAE		naturalized	acceptance uncertain
Muhlenbergia alopecuroides (Griseb.) P. M. Peterson & Columbus	POACEAE	WOLFTAIL	native	
Muhlenbergia andina (Nutt.) Hitchc.	POACEAE	FOXTAIL MUHLY	native	
Muhlenbergia appressa C. O. Goodd.	POACEAE	APPRESSED MUHLY	native	
Muhlenbergia arsenei Hitchc.	POACEAE	TOUGH MUHLY	native	
Muhlenbergia asperifolia (Nees & Meyen ex Trin.) Parodi	POACEAE	SCRATCH GRASS	native	
Muhlenbergia californica Vasey	POACEAE	CALIFORNIA MUHLY	native	
Muhlenbergia filiformis (Thurb. ex S. Watson) Rydb.	POACEAE	PULL-UP MUHLY	native	
Muhlenbergia fragilis Swallen	POACEAE	DELICATE MUHLY	native	
Muhlenbergia jonesii (Vasey) Hitchc.	POACEAE	JONES' MUHLY	native	
Muhlenbergia mexicana (L.) Trin.	POACEAE		native	
Muhlenbergia microsperma (DC.) Kunth	POACEAE	LITTLESEED MUHLY	native	
Muhlenbergia minutissima (Steud.) Swallen	POACEAE		native	
Muhlenbergia montana (Nutt.) Hitchc.	POACEAE	MOUNTAIN MUHLY	native	
Muhlenbergia pauciflora Buckley	POACEAE	FEW-FLOWERED MUHLY	native	
Muhlenbergia porteri Scribn. ex Beal	POACEAE		native	
Muhlenbergia richardsonis (Trin.) Rydb.	POACEAE	MAT MUHLY	native	
Muhlenbergia rigens (Benth.) Hitchc.	POACEAE	DEER GRASS	native	
Muhlenbergia utilis (Torr.) Hitchc.	POACEAE	APAREJO GRASS	native	
Muilla coronata Greene	THEMIDACEAE	CROWNED MUILLA	native	
Muilla maritima (Torr.) S. Watson	THEMIDACEAE	COMMON MUILLA	native	
Muilla transmontana Greene	THEMIDACEAE		native	
Munroa squarrosa (Nutt.) Torr.	POACEAE	FALSE BUFFALOGRASS	native	
Munzothamnus blairii (Munz & I. M. Johnst.) P. H. Raven	ASTERACEAE	BLAIR'S MUNZOTHAMNUS	native	
Myoporum laetum G. Forst.	SCROPHULARIACEAE	NGAIO TREE	naturalized	
Myosotis discolor Pers.	BORAGINACEAE	CHANGING FORGET-ME-NOT	naturalized	
Myosotis latifolia Poir.	BORAGINACEAE	BROADLEAVED FORGET-ME-NOT	naturalized	
Myosotis laxa Lehm.	BORAGINACEAE	BAY FORGET-ME-NOT	native	
Myosotis micrantha Pall. ex Lehm.	BORAGINACEAE	SMALL-FLOWERED FORGET-ME-NOT	naturalized	
Myosotis scorpioides L.	BORAGINACEAE	WATER FORGET-ME-NOT	naturalized	
Myosurus apetalus Gay	RANUNCULACEAE		native	
Myosurus apetalus Gay var. borealis Whittem.	RANUNCULACEAE		native	
Myosurus apetalus Gay var. montanus (G. R. Campb.) Whittem.	RANUNCULACEAE		native	
Myosurus cupulatus S. Watson	RANUNCULACEAE		native	
Myosurus minimus L.	RANUNCULACEAE		native	
Myosurus sessilis S. Watson	RANUNCULACEAE		native	
Myrica hartwegii S. Watson	MYRICACEAE	SIERRA SWEET BAY	native	
Myriophyllum aquaticum (Vell.) Verdc.	HALORAGACEAE	PARROT'S FEATHER	naturalized	
Myriophyllum hippuroides Torr. & A. Gray	HALORAGACEAE	WESTERN WATER-MILFOIL	native	
Myriophyllum quitense Kunth	HALORAGACEAE	ANDEAN WATER-MILFOIL	native	
Myriophyllum sibiricum V. Komarov	HALORAGACEAE	SIBERIAN WATER-MILFOIL	native	
Myriophyllum spicatum L.	HALORAGACEAE	EURASIAN WATER-MILFOIL	naturalized	
Myriophyllum verticillatum L.	HALORAGACEAE	WHORLED WATER-MILFOIL	native	
Najas flexilis (Willd.) Rostk. & W. L. E. Schmidt	HYDROCHARITACEAE	SLENDER WATER-NYMPH	native	
Najas gracillima (A. Braun ex Engelm.) Magnus	HYDROCHARITACEAE	THREAD-LEAVED WATER-NYMPH	naturalized	
Najas graminea Delile	HYDROCHARITACEAE	RICE-FIELD WATER-NYMPH	naturalized	
Najas guadalupensis (Spreng.) Magnus	HYDROCHARITACEAE		native	
Najas guadalupensis (Spreng.) Magnus subsp. guadalupensis	HYDROCHARITACEAE	COMMON WATER-NYMPH	native	
Najas marina L.	HYDROCHARITACEAE	HOLLY-LEAVED WATER-NYMPH	native	
Nama aretioides (Hook. & Arn.) Brand	BORAGINACEAE		native	
Nama aretioides (Hook. & Arn.) Brand var. californicum (Brand) Jeps.	BORAGINACEAE		native	
Nama aretioides (Hook. & Arn.) Brand var. multiflorum (A. Heller) Jeps.	BORAGINACEAE		native	
Nama californicum (A. Gray) J. D. Bacon	BORAGINACEAE		native	
Nama demissum A. Gray	BORAGINACEAE		native	
Nama demissum A. Gray var. covillei Brand	BORAGINACEAE		native	
Nama demissum A. Gray var. demissum	BORAGINACEAE		native	
Nama densum Lemmon	BORAGINACEAE		native	
Nama densum Lemmon var. densum	BORAGINACEAE		native	
Nama densum Lemmon var. parviflorum (Greenm.) C. L. Hitchc.	BORAGINACEAE		native	
Nama depressum A. Gray	BORAGINACEAE		native	
Nama dichotomum (Ruiz & Pav.) Choisy	BORAGINACEAE		native	
Nama dichotomum (Ruiz & Pav.) Choisy var. dichotomum	BORAGINACEAE	FORKED PURPLE MAT	native	
Nama hispidum A. Gray	BORAGINACEAE		native	
Nama hispidum A. Gray var. spathulatum (Torr.) C. L. Hitchc.	BORAGINACEAE		native	
Nama pusillum A. Gray	BORAGINACEAE		native	
Nama rothrockii A. Gray	BORAGINACEAE		native	
Nama stenocarpum A. Gray	BORAGINACEAE	MUD NAMA	native	
Narcissus pseudonarcissus L.	AMARYLLIDACEAE	DAFFODIL	naturalized	
Narcissus tazetta L.	AMARYLLIDACEAE	PAPER WHITE	naturalized	
Narthecium californicum Baker	NARTHECIACEAE		native	
Nasturtium gambelii (S. Watson) O. E. Schulz	BRASSICACEAE	GAMBEL'S WATER CRESS	native	
Nasturtium officinale W. T. Aiton	BRASSICACEAE	WATER CRESS	native	
Navarretia atractyloides (Benth.) Hook. & Arn.	POLEMONIACEAE		native	
Navarretia breweri (A. Gray) Greene	POLEMONIACEAE		native	
Navarretia capillaris (Kellogg) Kuntze	POLEMONIACEAE		native	
Navarretia cotulifolia (Benth.) Hook. & Arn.	POLEMONIACEAE	COTULA NAVARRETIA	native	
Navarretia divaricata (A. Gray) Greene	POLEMONIACEAE	MOUNTAIN NAVARRETIA	native	
Navarretia divaricata (A. Gray) Greene subsp. divaricata	POLEMONIACEAE		native	
Navarretia divaricata (A. Gray) Greene subsp. vividior (Jeps. & V. L. Bailey) H. Mason	POLEMONIACEAE		native	
Navarretia eriocephala H. Mason	POLEMONIACEAE	HOARY NAVARRETIA	native	
Navarretia filicaulis (Torr. ex A. Gray) Greene	POLEMONIACEAE		native	
Navarretia fossalis Moran	POLEMONIACEAE	SPREADING NAVARRETIA	native	
Navarretia gowenii L. A. Johnson	POLEMONIACEAE	LIME RIDGE NAVARRETIA	native	
Navarretia hamata Greene	POLEMONIACEAE		native	
Navarretia hamata Greene subsp. hamata	POLEMONIACEAE		native	
Navarretia hamata Greene subsp. leptantha (Greene) H. Mason	POLEMONIACEAE		native	
Navarretia hamata Greene subsp. parviloba A. G. Day	POLEMONIACEAE		native	
Navarretia heterandra H. Mason	POLEMONIACEAE	TEHAMA NAVARRETIA	native	
Navarretia heterodoxa (Greene) Greene	POLEMONIACEAE		native	
Navarretia intertexta (Benth.) Hook.	POLEMONIACEAE		native	
Navarretia intertexta (Benth.) Hook. subsp. intertexta	POLEMONIACEAE		native	
Navarretia intertexta (Benth.) Hook. subsp. propinqua (Suksd.) A. G. Day	POLEMONIACEAE		native	
Navarretia jepsonii V. L. Bailey ex Jeps.	POLEMONIACEAE	JEPSON'S NAVARRETIA	native	
Navarretia leptalea (A. Gray) L. A. Johnson	POLEMONIACEAE		native	
Navarretia leptalea (A. Gray) L. A. Johnson subsp. bicolor (H. Mason & A. D. Grant) L. A. Johnson	POLEMONIACEAE		native	
Navarretia leptalea (A. Gray) L. A. Johnson subsp. leptalea	POLEMONIACEAE		native	
Navarretia leucocephala Benth.	POLEMONIACEAE		native	
Navarretia leucocephala Benth. subsp. bakeri (H. Mason) A. G. Day	POLEMONIACEAE	BAKER'S NAVARRETIA	native	
Navarretia leucocephala Benth. subsp. leucocephala	POLEMONIACEAE		native	
Navarretia leucocephala Benth. subsp. minima (Nutt.) A. G. Day	POLEMONIACEAE		native	
Navarretia leucocephala Benth. subsp. pauciflora (H. Mason) A. G. Day	POLEMONIACEAE	FEW-FLOWERED NAVARRETIA	native	
Navarretia leucocephala Benth. subsp. plieantha (H. Mason) A. G. Day	POLEMONIACEAE	MANY-FLOWERED NAVARRETIA	native	
Navarretia linearifolia (Howell) L.A. Johnson	POLEMONIACEAE		native	
Navarretia linearifolia (Howell) L.A. Johnson subsp. linearifolia	POLEMONIACEAE		native	
Navarretia linearifolia (Howell) L.A. Johnson subsp. pinnatisecta (H. Mason & A.D. Grant) L.A. Johnson	POLEMONIACEAE		native	
Navarretia mellita Greene	POLEMONIACEAE		native	
Navarretia mitracarpa Greene	POLEMONIACEAE		native	
Navarretia myersii P. S. Allen & A. G. Day	POLEMONIACEAE		native	
Navarretia myersii P. S. Allen & A. G. Day subsp. deminuta A. G. Day	POLEMONIACEAE	SMALL PINCUSHION NAVARRETIA	native	
Navarretia myersii P. S. Allen & A. G. Day subsp. myersii	POLEMONIACEAE	PINCUSHION NAVARRETIA	native	
Navarretia nigelliformis Greene	POLEMONIACEAE		native	
Navarretia nigelliformis Greene subsp. nigelliformis	POLEMONIACEAE	ADOBE NAVARRETIA	native	
Navarretia nigelliformis Greene subsp. radians (J. T. Howell) A. G. Day	POLEMONIACEAE	SHINING NAVARRETIA	native	
Navarretia ojaiensis Elvin, J.M. Porter, & L.A. Johnson	POLEMONIACEAE	OJAI NAVARRETIA	native	
Navarretia peninsularis Greene	POLEMONIACEAE	BAJA NAVARRETIA	native	
Navarretia prolifera Greene	POLEMONIACEAE		native	
Navarretia prolifera Greene subsp. lutea (Brand) H. Mason	POLEMONIACEAE	YELLOW BUR NAVARRETIA	native	
Navarretia prolifera Greene subsp. prolifera	POLEMONIACEAE		native	
Navarretia prostrata (A. Gray) Greene	POLEMONIACEAE	PROSTRATE VERNAL POOL NAVARRETIA	native	
Navarretia pubescens (Benth.) Hook. & Arn.	POLEMONIACEAE		native	
Navarretia rosulata Brand	POLEMONIACEAE	MARIN COUNTY NAVARRETIA	native	
Navarretia setiloba Coville	POLEMONIACEAE	PIUTE MOUNTAINS NAVARRETIA	native	
Navarretia sinistra (M. E. Jones) L. A. Johnson	POLEMONIACEAE		native	
Navarretia sinistra (M. E. Jones) L. A. Johnson subsp. sinistra	POLEMONIACEAE		native	
Navarretia squarrosa (Eschsch.) Hook. & Arn.	POLEMONIACEAE	SKUNKWEED	native	
Navarretia subuligera Greene	POLEMONIACEAE	AWL-LEAVED NAVARRETIA	native	
Navarretia tagetina Greene	POLEMONIACEAE	MARIGOLD NAVARRETIA	native	
Navarretia viscidula Benth.	POLEMONIACEAE		native	
Nemacaulis denudata Nutt.	POLYGONACEAE		native	
Nemacaulis denudata Nutt. var. denudata	POLYGONACEAE	COAST WOOLLY-HEADS	native	
Nemacaulis denudata Nutt. var. gracilis Goodman & L. D. Benson	POLYGONACEAE	SLENDER COTTONHEADS	native	
Nemacladus calcaratus Morin	CAMPANULACEAE	CHIMNEY CREEK NEMACLADUS	native	
Nemacladus californicus (A. Gray) Morin	CAMPANULACEAE		native	
Nemacladus capillaris Greene	CAMPANULACEAE		native	
Nemacladus glanduliferus Jeps.	CAMPANULACEAE		native	
Nemacladus gracilis Eastw.	CAMPANULACEAE	SLENDER NEMACLADUS	native	
Nemacladus interior (Munz) G. T. Robbins	CAMPANULACEAE		native	
Nemacladus longiflorus A. Gray	CAMPANULACEAE		native	
Nemacladus longiflorus A. Gray var. breviflorus McVaugh	CAMPANULACEAE		native	
Nemacladus longiflorus A. Gray var. longiflorus	CAMPANULACEAE		native	
Nemacladus montanus Greene	CAMPANULACEAE		native	
Nemacladus orientalis (McVaugh) Morin	CAMPANULACEAE		native	
Nemacladus pinnatifidus Greene	CAMPANULACEAE		native	
Nemacladus ramosissimus Nutt.	CAMPANULACEAE		native	
Nemacladus rigidus Curran	CAMPANULACEAE		native	
Nemacladus rubescens Greene	CAMPANULACEAE		native	
Nemacladus secundiflorus G. T. Robbins	CAMPANULACEAE		native	
Nemacladus secundiflorus G. T. Robbins var. robbinsii Morin	CAMPANULACEAE	ROBBINS' NEMACLADUS	native	
Nemacladus secundiflorus G. T. Robbins var. secundiflorus	CAMPANULACEAE	LARGE-FLOWERED NEMACLADUS	native	
Nemacladus sigmoideus G. T. Robbins	CAMPANULACEAE		native	
Nemacladus tenuis (McVaugh) Morin	CAMPANULACEAE		native	
Nemacladus tenuis (McVaugh) Morin var. aliformis Morin	CAMPANULACEAE		native	
Nemacladus tenuis (McVaugh) Morin var. tenuis	CAMPANULACEAE		native	
Nemacladus twisselmannii J. T. Howell	CAMPANULACEAE	TWISSELMANN'S NEMACLADUS	native	
Nemophila breviflora A. Gray	BORAGINACEAE	GREAT BASIN NEMOPHILA	native	
Nemophila heterophylla Fisch. & C. A. Mey.	BORAGINACEAE		native	
Nemophila maculata Benth. ex Lindl.	BORAGINACEAE	FIVESPOT	native	
Nemophila menziesii Hook. & Arn.	BORAGINACEAE	BABY BLUE-EYES	native	
Nemophila menziesii Hook. & Arn. var. atomaria (Fisch. & C. A. Mey.) Voss	BORAGINACEAE		native	
Nemophila menziesii Hook. & Arn. var. integrifolia Parish	BORAGINACEAE		native	
Nemophila menziesii Hook. & Arn. var. menziesii	BORAGINACEAE		native	
Nemophila parviflora Douglas ex Benth.	BORAGINACEAE		native	
Nemophila parviflora Douglas ex Benth. var. austiniae (Eastw.) Brand	BORAGINACEAE		native	
Nemophila parviflora Douglas ex Benth. var. parviflora	BORAGINACEAE		native	
Nemophila parviflora Douglas ex Benth. var. quercifolia (Eastw.) H. P. Chandler	BORAGINACEAE	OAK-LEAVED NEMOPHILA	native	
Nemophila pedunculata Douglas ex Benth.	BORAGINACEAE		native	
Nemophila pulchella Eastw.	BORAGINACEAE		native	
Nemophila pulchella Eastw. var. fremontii (Elmer) Constance	BORAGINACEAE		native	
Nemophila pulchella Eastw. var. gracilis (Eastw.) Constance	BORAGINACEAE		native	
Nemophila pulchella Eastw. var. pulchella	BORAGINACEAE		native	
Nemophila spatulata Coville	BORAGINACEAE		native	
Neoholmgrenia andina (Nutt.) W.L. Wagner & Hoch	ONAGRACEAE		native	
Neostapfia colusana (Burtt Davy) Burtt Davy	POACEAE	COLUSA GRASS	native	
Nepeta cataria L.	LAMIACEAE	CATNIP	naturalized	
Nerium oleander L.	APOCYNACEAE	COMMON OLEANDER	naturalized	
Nestotus stenophyllus (A. Gray) R. P. Roberts, Urbatsch, & Neubig	ASTERACEAE		native	
Neviusia cliftonii Shevock, Ertter, & D. W. Taylor	ROSACEAE	SHASTA SNOW-WREATH	native	
Nicolletia occidentalis A. Gray	ASTERACEAE	HOLE-IN-THE-SAND PLANT	native	
Nicotiana acuminata (Graham) Hook.	SOLANACEAE		naturalized	
Nicotiana acuminata (Graham) Hook. var. multiflora (Phil.) Reiche	SOLANACEAE		naturalized	
Nicotiana attenuata Torr. ex S. Watson	SOLANACEAE		native	
Nicotiana clevelandii A. Gray	SOLANACEAE		native	
Nicotiana glauca Graham	SOLANACEAE	TREE TOBACCO	naturalized	
Nicotiana obtusifolia M. Martens & Galeotti	SOLANACEAE		native	
Nicotiana quadrivalvis Pursh	SOLANACEAE		native	
Nigella damascena L.	RANUNCULACEAE		naturalized	
Nitrophila mohavensis Munz & J. C. Roos	AMARANTHACEAE	AMARGOSA NITROPHILA	native	
Nitrophila occidentalis (Moq.) S. Watson	AMARANTHACEAE		native	
Noccaea fendleri (A. Gray) Holub	BRASSICACEAE		native	
Noccaea fendleri (A. Gray) Holub subsp. californica (S. Watson) Al-Shehbaz & M. Koch	BRASSICACEAE	KNEELAND PRAIRIE PENNYCRESS	native	
Noccaea fendleri (A. Gray) Holub subsp. glauca (A. Nelson) Al-Shehbaz & M. Koch	BRASSICACEAE		native	
Nolina bigelovii (Torr.) S. Watson	RUSCACEAE		native	
Nolina cismontana Dice	RUSCACEAE	CHAPARRAL NOLINA	native	
Nolina interrata Gentry	RUSCACEAE	DEHESA NOLINA	native	
Nolina parryi S. Watson	RUSCACEAE		native	
Nothocalais alpestris (A. Gray) K. L. Chambers	ASTERACEAE	ALPINE LAKE FALSE-DANDELION	native	
Nothocalais troximoides (A. Gray) Greene	ASTERACEAE	SAGEBRUSH FALSE-DANDELION	native	
Nothochelone nemorosa (Dougl. ex Lindl.) Straw	PLANTAGINACEAE		native	
Notholaena californica D. C. Eaton	PTERIDACEAE	CALIFORNIA CLOAK-FERN	native	
Notholithocarpus densiflorus (Hook. & Arn.) Manos, C.H. Cannon, & S. Oh	FAGACEAE		native	
Notholithocarpus densiflorus (Hook. & Arn.) Manos, C.H. Cannon, & S. Oh var. densiflorus	FAGACEAE		native	
Notholithocarpus densiflorus (Hook. & Arn.) Manos, C.H. Cannon, & S. Oh var. echinoides (R. Br. ter) Manos, C.H. Cannon, & S. Oh	FAGACEAE		native	
Nothoscordum gracile (Aiton) Stearn	ALLIACEAE		naturalized	
Nuphar polysepala Engelm.	NYMPHAEACEAE		native	
Nuttallanthus texanus (Scheele) D. A. Sutton	PLANTAGINACEAE	BLUE TOADFLAX	native	
Nymphaea mexicana Zucc.	NYMPHAEACEAE	BANANA WATERLILY	naturalized	acceptance uncertain
Nymphaea odorata Aiton	NYMPHAEACEAE	WHITE WATERLILY	naturalized	
Nymphaea odorata Aiton subsp. odorata	NYMPHAEACEAE		naturalized	
Nymphoides peltata (S. G. Gmel.) Kuntze	MENYANTHACEAE	WATER FRINGE	naturalized	
Odontostomum hartwegii Torr.	TECOPHILAEACEAE		native	
Oemleria cerasiformis (Hook. & Arn.) J. W. Landon	ROSACEAE		native	
Oenanthe sarmentosa C. Presl ex DC.	APIACEAE		native	
Oenothera biennis L.	ONAGRACEAE	COMMON EVENING-PRIMROSE	naturalized	
Oenothera californica (S. Watson) S. Watson	ONAGRACEAE		native	
Oenothera californica (S. Watson) S. Watson subsp. avita W. M. Klein	ONAGRACEAE		native	
Oenothera californica (S. Watson) S. Watson subsp. californica	ONAGRACEAE		native	
Oenothera californica (S. Watson) S. Watson subsp. eurekensis (Munz & J. C. Roos) W. M. Klein	ONAGRACEAE	EUREKA DUNES EVENING-PRIMROSE	native	
Oenothera cavernae Munz	ONAGRACEAE	CAVE EVENING-PRIMROSE	native	
Oenothera cespitosa Nutt.	ONAGRACEAE	FRAGRANT EVENING-PRIMROSE	native	
Oenothera cespitosa Nutt. subsp. crinita (Rydb.) Munz	ONAGRACEAE	CESPITOSE EVENING-PRIMROSE	native	
Oenothera cespitosa Nutt. subsp. marginata (Nutt. ex Hook. & Arn.) Munz	ONAGRACEAE		native	
Oenothera curtiflora W.L. Wagner & Hoch	ONAGRACEAE	VELVET WEED	naturalized	
Oenothera deltoides Torr. & Frém.	ONAGRACEAE	BASKET EVENING-PRIMROSE	native	
Oenothera deltoides Torr. & Frém. subsp. cognata (Jeps.) W. M. Klein	ONAGRACEAE		native	
Oenothera deltoides Torr. & Frém. subsp. deltoides	ONAGRACEAE		native	
Oenothera deltoides Torr. & Frém. subsp. howellii (Munz) W. M. Klein	ONAGRACEAE	ANTIOCH DUNES EVENING-PRIMROSE	native	
Oenothera deltoides Torr. & Frém. subsp. piperi (Munz) W. M. Klein	ONAGRACEAE		native	
Oenothera elata Kunth	ONAGRACEAE		native	
Oenothera elata Kunth subsp. hirsutissima (S. Watson) W. Dietr.	ONAGRACEAE		native	
Oenothera elata Kunth subsp. hookeri (Torr. & A. Gray) W. Dietr. & W. L. Wagner	ONAGRACEAE		native	
Oenothera flava (A. Nelson) Garrett	ONAGRACEAE		native	
Oenothera glazioviana Micheli	ONAGRACEAE		naturalized	
Oenothera laciniata Hill	ONAGRACEAE		naturalized	
Oenothera longissima Rydb.	ONAGRACEAE	LONG-STEM EVENING-PRIMROSE	native	
Oenothera primiveris A. Gray	ONAGRACEAE		native	
Oenothera primiveris A. Gray subsp. bufonis (M. E. Jones) Munz	ONAGRACEAE		native	
Oenothera primiveris A. Gray subsp. primiveris	ONAGRACEAE		native	
Oenothera pubescens Willd. ex Spreng.	ONAGRACEAE		native	
Oenothera sinuosa W.L. Wagner & Hoch	ONAGRACEAE	WAVY-LEAVED GAURA	naturalized	
Oenothera speciosa Nutt.	ONAGRACEAE		naturalized	
Oenothera suffrutescens (Ser.) W.L. Wagner & Hoch	ONAGRACEAE	LINDA TARDE	native	
Oenothera villosa Thunb.	ONAGRACEAE		native	
Oenothera villosa Thunb. subsp. strigosa (Rydb.) W. Dietr. & P. H. Raven	ONAGRACEAE		native	
Oenothera wolfii (Munz) P. H. Raven, W. Dietr., & Stubbe	ONAGRACEAE	WOLF'S EVENING-PRIMROSE	native	
Oenothera xenogaura W.L. Wagner & Hoch	ONAGRACEAE		naturalized	
Oenothera xylocarpa Coville	ONAGRACEAE		native	
Olea europaea L.	OLEACEAE		naturalized	
Oligomeris linifolia (Vahl ex Hornem.) J. F. Macbr.	RESEDACEAE		native	
Olneya tesota A. Gray	FABACEAE	IRONWOOD	native	
Olsynium douglasii (A. Dietr.) E. P. Bicknell	IRIDACEAE		native	
Olsynium douglasii (A. Dietr.) E. P. Bicknell var. douglasii	IRIDACEAE	GRASS WIDOWS	native	
Oncosiphon piluliferum (L. f.) Källersjö	ASTERACEAE	STINKNET	naturalized	
Onobrychis viciifolia Scop.	FABACEAE	SANFOIN	naturalized	
Onopordum acanthium L.	ASTERACEAE		naturalized	
Onopordum acanthium L. subsp. acanthium	ASTERACEAE	SCOTCH THISTLE	naturalized	
Onopordum illyricum L.	ASTERACEAE	ILLYRIAN THISTLE	naturalized	
Onopordum tauricum Willd.	ASTERACEAE	TAURIAN THISTLE	naturalized	
Ophioglossum californicum Prantl	OPHIOGLOSSACEAE	CALIFORNIA ADDER'S-TONGUE	native	
Ophioglossum pusillum Raf.	OPHIOGLOSSACEAE	NORTHERN ADDER'S-TONGUE	native	
Opuntia X occidentalis Engelm. & J.M. Bigelow	CACTACEAE		native	
Opuntia X vaseyi (J. M. Coult.) Britton & Rose	CACTACEAE		native	
Opuntia basilaris Engelm. & J. M. Bigelow	CACTACEAE		native	
Opuntia basilaris Engelm. & J. M. Bigelow var. basilaris	CACTACEAE	BEAVERTAIL	native	
Opuntia basilaris Engelm. & J. M. Bigelow var. brachyclada (Griffiths) Munz	CACTACEAE	SHORT-JOINT BEAVERTAIL	native	
Opuntia basilaris Engelm. & J. M. Bigelow var. treleasei (J. M. Coult.) Toumey	CACTACEAE	BAKERSFIELD CACTUS	native	
Opuntia chlorotica Engelm. & J. M. Bigelow	CACTACEAE	PANCAKE PRICKLY-PEAR	native	
Opuntia engelmannii Salm-Dyck ex Engelm.	CACTACEAE		native	
Opuntia engelmannii Salm-Dyck ex Engelm. var. engelmannii	CACTACEAE	ENGELMANN PRICKLY-PEAR	native	
Opuntia ficus-indica (L.) Mill.	CACTACEAE	MISSION PRICKLY-PEAR	naturalized	
Opuntia fragilis (Nutt.) Haw.	CACTACEAE	BRITTLE PRICKLY-PEAR	native	
Opuntia littoralis (Engelm.) Cockerell	CACTACEAE		native	
Opuntia microdasys (Lehm.) Pfeiff.	CACTACEAE	BUNNY EARS	naturalized	
Opuntia oricola Philbrick	CACTACEAE		native	
Opuntia phaeacantha Engelm.	CACTACEAE	BROWN-SPINED PRICKLY-PEAR	native	
Opuntia polyacantha Haw.	CACTACEAE	STARVATION PRICKLY-PEAR	native	
Opuntia polyacantha Haw. var. erinacea (Engelm. & J. M. Bigelow) B. D. Parfitt	CACTACEAE	GRIZZLY BEAR PRICKLY-PEAR	native	
Opuntia polyacantha Haw. var. hystricina (Engelm. & J. M. Bigelow) B. D. Parfitt	CACTACEAE	PORCUPINE PRICKLY-PEAR	native	
Orcuttia californica Vasey	POACEAE	CALIFORNIA ORCUTT GRASS	native	
Orcuttia inaequalis Hoover	POACEAE	SAN JOAQUIN VALLEY ORCUTT GRASS	native	
Orcuttia pilosa Hoover	POACEAE	HAIRY ORCUTT GRASS	native	
Orcuttia tenuis Hitchc.	POACEAE	SLENDER ORCUTT GRASS	native	
Orcuttia viscida (Hoover) Reeder	POACEAE	SACRAMENTO ORCUTT GRASS	native	
Oreonana clementis (M. E. Jones) Jeps.	APIACEAE		native	
Oreonana purpurascens Shevock & Constance	APIACEAE	PURPLE MOUNTAIN-PARSLEY	native	
Oreonana vestita (S. Watson) Jeps.	APIACEAE	WOOLLY MOUNTAIN-PARSLEY	native	
Oreostemma alpigenum (Torr. & A. Gray) Greene	ASTERACEAE		native	
Oreostemma alpigenum (Torr. & A. Gray) Greene var. andersonii (A. Gray) G. L. Nesom	ASTERACEAE		native	
Oreostemma elatum (Greene) Greene	ASTERACEAE	TALL ALPINE-ASTER	native	
Oreostemma peirsonii (Sharsm.) G. L. Nesom	ASTERACEAE		native	
Origanum X majoricum Cambess.	LAMIACEAE	HARDY SWEET MARJORAM	naturalized	
Origanum vulgare L.	LAMIACEAE		naturalized	
Origanum vulgare L. subsp. hirtum (Link) Ietsw.	LAMIACEAE	OREGANO	naturalized	
Ornithopus pinnatus (Mill.) Druce	FABACEAE		naturalized	
Ornithopus sativus Brot.	FABACEAE	COMMON BIRDSFOOT	naturalized	
Ornithostaphylos oppositifolia (Parry) Small	ERICACEAE	BAJA CALIFORNIA BIRDBUSH	native	
Orobanche bulbosa Beck	OROBANCHACEAE		native	
Orobanche californica Cham. & Schltdl.	OROBANCHACEAE		native	
Orobanche californica Cham. & Schltdl. subsp. californica	OROBANCHACEAE		native	
Orobanche californica Cham. & Schltdl. subsp. condensa Heckard	OROBANCHACEAE		native	
Orobanche californica Cham. & Schltdl. subsp. feudgei (Munz) Heckard	OROBANCHACEAE		native	
Orobanche californica Cham. & Schltdl. subsp. grandis Heckard	OROBANCHACEAE		native	
Orobanche californica Cham. & Schltdl. subsp. grayana (Beck) Heckard	OROBANCHACEAE		native	
Orobanche californica Cham. & Schltdl. subsp. jepsonii (Munz) Heckard	OROBANCHACEAE		native	
Orobanche cooperi (A. Gray) A. Heller	OROBANCHACEAE		native	
Orobanche corymbosa (Rydb.) Ferris	OROBANCHACEAE		native	
Orobanche fasciculata Nutt.	OROBANCHACEAE	CLUSTERED BROOMRAPE	native	
Orobanche parishii (Jeps.) Heckard	OROBANCHACEAE		native	
Orobanche parishii (Jeps.) Heckard subsp. brachyloba Heckard	OROBANCHACEAE	SHORT-LOBED BROOMRAPE	native	
Orobanche parishii (Jeps.) Heckard subsp. parishii	OROBANCHACEAE		native	
Orobanche pinorum Hook.	OROBANCHACEAE		native	
Orobanche ramosa L.	OROBANCHACEAE		naturalized	
Orobanche uniflora L.	OROBANCHACEAE	NAKED BROOMRAPE	native	
Orobanche valida Jeps.	OROBANCHACEAE		native	
Orobanche valida Jeps. subsp. howellii Heckard & L. T. Collins	OROBANCHACEAE	HOWELL'S BROOMRAPE	native	
Orobanche valida Jeps. subsp. valida	OROBANCHACEAE	ROCK CREEK BROOMRAPE	native	
Orobanche vallicola (Jeps.) Heckard	OROBANCHACEAE		native	
Orochaenactis thysanocarpha (A. Gray) Coville	ASTERACEAE		native	
Orogenia fusiformis S. Watson	APIACEAE		native	
Orthilia secunda (L.) House	ERICACEAE	ONE-SIDED WINTERGREEN	native	
Orthocarpus bracteosus Benth.	OROBANCHACEAE		native	
Orthocarpus cuspidatus Greene	OROBANCHACEAE		native	
Orthocarpus cuspidatus Greene subsp. copelandii (Eastw.) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Orthocarpus cuspidatus Greene subsp. cryptanthus (Piper) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Orthocarpus cuspidatus Greene subsp. cuspidatus	OROBANCHACEAE	SISKIYOU MOUNTAINS ORTHOCARPUS	native	
Orthocarpus imbricatus S. Watson	OROBANCHACEAE		native	
Orthocarpus luteus Nutt.	OROBANCHACEAE		native	
Orthocarpus pachystachyus A. Gray	OROBANCHACEAE	SHASTA ORTHOCARPUS	native	
Oryctes nevadensis S. Watson	SOLANACEAE	NEVADA ORYCTES	native	
Oryza sativa L.	POACEAE		naturalized	
Osmadenia tenella Nutt.	ASTERACEAE	OSMADENIA	native	
Osmorhiza berteroi DC.	APIACEAE		native	
Osmorhiza brachypoda Torr.	APIACEAE		native	
Osmorhiza depauperata Phil.	APIACEAE	BLUNT-FRUITED SWEET-CICELY	native	
Osmorhiza occidentalis (Nutt.) Torr.	APIACEAE		native	
Osmorhiza purpurea (J. M. Coult. & Rose) Suksd.	APIACEAE		native	
Oxalis articulata Savigny subsp. rubra (A. St.-Hil.) Lourteig	OXALIDACEAE	WINDOWBOX WOOD-SORREL	naturalized	
Oxalis californica (Abrams) R. Knuth	OXALIDACEAE	CALIFORNIA WOOD-SORREL	native	
Oxalis corniculata L.	OXALIDACEAE		naturalized	
Oxalis incarnata L.	OXALIDACEAE	CRIMSON WOOD-SORREL	naturalized	
Oxalis micrantha Bertero ex Colla	OXALIDACEAE	DWARF WOOD-SORREL	naturalized	
Oxalis oregana Nutt.	OXALIDACEAE	REDWOOD SORREL	native	
Oxalis pes-caprae L.	OXALIDACEAE	BERMUDA BUTTERCUP	naturalized	
Oxalis pilosa Nutt.	OXALIDACEAE		native	
Oxalis suksdorfii Trel.	OXALIDACEAE	SUKSDORF'S WOOD-SORREL	native	
Oxalis trilliifolia Hook.	OXALIDACEAE		native	
Oxypolis occidentalis J. M. Coult. & Rose	APIACEAE		native	
Oxyria digyna (L.) Hill	POLYGONACEAE		native	
Oxystylis lutea Torr. & Frém.	CLEOMACEAE		native	
Oxytheca dendroidea Nutt.	POLYGONACEAE		native	
Oxytheca dendroidea Nutt. subsp. dendroidea	POLYGONACEAE	TREE-LIKE PUNCTUREBRACT	native	
Oxytheca perfoliata Torr. & A. Gray	POLYGONACEAE	ROUND-LEAF PUNCTUREBRACT	native	
Oxytheca watsonii Torr. & A. Gray	POLYGONACEAE	WATSON'S OXYTHECA	native	
Oxytropis borealis DC.	FABACEAE	BOREAL LOCOWEED	native	
Oxytropis borealis DC. var. australis S. L. Welsh	FABACEAE		native	
Oxytropis borealis DC. var. viscida (Nutt.) S. L. Welsh	FABACEAE	STICKY OXYTROPE	native	
Oxytropis deflexa (Pall.) DC.	FABACEAE		native	
Oxytropis deflexa (Pall.) DC. var. sericea Torr. & A. Gray	FABACEAE	BLUE PENDENT-POD OXYTROPE	native	
Oxytropis oreophila A. Gray	FABACEAE		native	
Oxytropis oreophila A. Gray var. oreophila	FABACEAE	ROCK-LOVING OXYTROPE	native	
Oxytropis parryi A. Gray	FABACEAE	PARRY'S OXYTROPE	native	
Ozomelis diversifolia (Greene) Rydb.	SAXIFRAGACEAE		native	
Ozomelis trifida (Graham) Rydb.	SAXIFRAGACEAE		native	
Packera bernardina (Greene) W. A. Weber & Á. Löve	ASTERACEAE	SAN BERNARDINO RAGWORT	native	
Packera bolanderi (A. Gray) W. A. Weber & Á. Löve	ASTERACEAE		native	
Packera bolanderi (A. Gray) W. A. Weber & Á. Löve var. bolanderi	ASTERACEAE	SEACOAST RAGWORT	native	
Packera breweri (Burtt Davy) W. A. Weber & Á. Löve	ASTERACEAE	BREWER'S RAGWORT	native	
Packera cana (Hook.) W. A. Weber & Á. Löve	ASTERACEAE	WOOLLY GROUNDSEL	native	
Packera clevelandii (Greene) W. A. Weber & Á. Löve	ASTERACEAE	CLEVELAND'S RAGWORT	native	
Packera eurycephala (Torr. & A. Gray) W.A. Weber & Á. Löve	ASTERACEAE		native	
Packera eurycephala (Torr. & A. Gray) W.A. Weber & Á. Löve var. eurycephala	ASTERACEAE	WIDEHEAD GROUNDSEL	native	
Packera eurycephala (Torr. & A. Gray) W.A. Weber & Á. Löve var. lewisrosei (J. T. Howell) J. F. Bain	ASTERACEAE	LEWIS ROSE'S RAGWORT	native	
Packera ganderi (T. M. Barkley & R. M. Beauch.) W. A. Weber & Á. Löve	ASTERACEAE	GANDER'S RAGWORT	native	
Packera greenei (A. Gray) W. A. Weber & Á. Löve	ASTERACEAE	FLAME RAGWORT	native	
Packera hesperia (Greene) W. A. Weber & Á. Löve	ASTERACEAE	WESTERN RAGWORT	native	
Packera indecora (Greene) Á. Löve & D. Löve	ASTERACEAE	RAYLESS MOUNTAIN RAGWORT	native	
Packera ionophylla (Greene) W. A. Weber & Á. Löve	ASTERACEAE	TEHACHAPI RAGWORT	native	
Packera layneae (Greene) W. A. Weber & Á. Löve	ASTERACEAE	LAYNE'S RAGWORT	native	
Packera macounii (Greene) W. A. Weber & Á. Löve	ASTERACEAE	SISKIYOU MOUNTAINS RAGWORT	native	
Packera multilobata (Torr. & A. Gray) W. A. Weber & Á. Löve	ASTERACEAE	LOBELEAF GROUNDSEL	native	
Packera pauciflora (Pursh) Á. Löve & D. Löve	ASTERACEAE	ALPINE GROUNDSEL	native	
Packera pseudaurea (Rydb.) W. A. Weber & Á. Löve	ASTERACEAE		native	
Packera pseudaurea (Rydb.) W. A. Weber & Á. Löve var. pseudaurea	ASTERACEAE	FALSE-GOLD GROUNDSEL	native	
Packera streptanthifolia (Greene) W. A. Weber & Á. Löve	ASTERACEAE		native	
Packera streptanthifolia (Greene) W. A. Weber & Á. Löve var. streptanthifolia	ASTERACEAE	ROCKY MOUNTAIN GROUNDSEL	native	
Packera subnuda Trock & T. M. Barkley	ASTERACEAE		native	
Packera subnuda Trock & T. M. Barkley var. subnuda	ASTERACEAE	CLEFTLEAF GROUNDSEL	native	
Packera werneriifolia (A. Gray) W. A. Weber & Á. Löve	ASTERACEAE	HOARY GROUNDSEL	native	
Paeonia brownii Douglas	PAEONIACEAE		native	
Paeonia californica Nutt.	PAEONIACEAE		native	
Palafoxia arida B. L. Turner & M. I. Morris	ASTERACEAE		native	
Palafoxia arida B. L. Turner & M. I. Morris var. gigantea (M. E. Jones) B. L. Turner & M. I. Morris	ASTERACEAE	GIANT SPANISH-NEEDLE	native	
Palafoxia arida B. L. Turner & M. Morris var. arida	ASTERACEAE		native	
Pancratium maritimum L.	AMARYLLIDACEAE		naturalized	
Panicum acuminatum Sw.	POACEAE		native	
Panicum acuminatum Sw. var. fasciculatum (Torr.) Beetle	POACEAE	PACIFIC PANIC GRASS	native	
Panicum acuminatum Sw. var. lindheimeri (Nash) Fernald	POACEAE		native	
Panicum acuminatum Sw. var. thermale (Bol.) Wipff	POACEAE	GEYSERS PANICUM	native	
Panicum antidotale Retz.	POACEAE	BLUE PANIC GRASS	naturalized	
Panicum capillare L.	POACEAE	WITCH GRASS	native	
Panicum dichotomiflorum Michx.	POACEAE		naturalized	
Panicum dichotomiflorum Michx. subsp. dichotomiflorum	POACEAE	FALL PANIC GRASS	naturalized	
Panicum hillmanii Chase	POACEAE	HILLMAN'S PANIC GRASS	naturalized	
Panicum hirticaule J. Presl	POACEAE		native	
Panicum hirticaule J. Presl subsp. hirticaule	POACEAE	ROUGHSTALK WITCH GRASS	naturalized	
Panicum miliaceum L.	POACEAE		naturalized	
Panicum miliaceum L. subsp. miliaceum	POACEAE	BROOM CORN MILLET	naturalized	
Panicum oligosanthes Schult.	POACEAE		native	
Panicum oligosanthes Schult. var. scribnerianum (Nash) Fernald	POACEAE	SCRIBNER'S PANIC GRASS	native	
Panicum rigidulum Bosc ex Nees	POACEAE		naturalized	
Panicum rigidulum Bosc ex Nees subsp. rigidulum	POACEAE	REDTOP PANICUM	naturalized	
Panicum urvilleanum Kunth	POACEAE	SILKY PANIC GRASS	native	
Papaver californicum A. Gray	PAPAVERACEAE	FIRE POPPY	native	
Papaver heterophyllum (Benth.) Greene	PAPAVERACEAE	WIND POPPY	native	
Papaver hybridum L.	PAPAVERACEAE	ROUGH POPPY	naturalized	
Papaver rhoeas L.	PAPAVERACEAE	CORN POPPY	naturalized	
Parapholis incurva (L.) C. E. Hubb.	POACEAE		naturalized	
Parapholis strigosa (Dumort.) C. E. Hubb.	POACEAE		naturalized	
Parentucellia latifolia (L.) Caruel	OROBANCHACEAE		naturalized	
Parentucellia viscosa (L.) Caruel	OROBANCHACEAE		naturalized	
Parietaria hespera Hinton	URTICACEAE		native	
Parietaria hespera Hinton var. californica Hinton	URTICACEAE		native	
Parietaria hespera Hinton var. hespera	URTICACEAE		native	
Parietaria judaica L.	URTICACEAE		naturalized	
Parietaria pensylvanica Willd.	URTICACEAE		native	
Parkinsonia aculeata L.	FABACEAE	MEXICAN PALO VERDE	naturalized	
Parkinsonia florida (Benth. ex A. Gray) S. Watson	FABACEAE	BLUE PALO VERDE	native	
Parkinsonia microphylla Torr.	FABACEAE	LITTLE-LEAVED PALO VERDE	native	
Parnassia cirrata Piper	PARNASSIACEAE		native	
Parnassia cirrata Piper var. cirrata	PARNASSIACEAE	SAN BERNARDINO GRASS-OF-PARNASSUS	native	
Parnassia cirrata Piper var. intermedia (Rydb.) P. K. Holmgren & N. H. Holmgren	PARNASSIACEAE	CASCADE GRASS-OF-PARNASSUS	native	
Parnassia fimbriata K. D. Konig	PARNASSIACEAE		native	
Parnassia palustris L.	PARNASSIACEAE		native	
Parnassia parviflora DC.	PARNASSIACEAE	SMALL-FLOWERED GRASS-OF-PARNASSUS	native	
Paronychia ahartii Ertter	CARYOPHYLLACEAE	AHART'S PARONYCHIA	native	
Paronychia echinulata Chater	CARYOPHYLLACEAE		naturalized	
Paronychia echinulata Chater var. echinulata	CARYOPHYLLACEAE		naturalized	
Paronychia franciscana Eastw.	CARYOPHYLLACEAE		naturalized	
Parthenocissus inserta (A. Kern.) Fritsch	VITACEAE	WOODBINE	naturalized	
Paspalum dilatatum Poir.	POACEAE	DALLIS GRASS	naturalized	
Paspalum distichum L.	POACEAE	KNOT GRASS	native	
Paspalum urvillei Steud.	POACEAE		naturalized	
Paspalum vaginatum Sw.	POACEAE	SEASHORE PASPALUM	naturalized	
Passiflora caerulea L.	PASSIFLORACEAE	BLUE PASSION FLOWER	naturalized	
Passiflora tarminiana Coppens & V. E. Barney	PASSIFLORACEAE	BANANA PASSION FRUIT	naturalized	
Pastinaca sativa L.	APIACEAE		naturalized	
Paxistima myrsinites (Pursh) Raf.	CELASTRACEAE	OREGON BOXWOOD	native	
Pectiantia breweri (A. Gray) Rydb.	SAXIFRAGACEAE		native	
Pectiantia ovalis (Greene) Rydb.	SAXIFRAGACEAE		native	
Pectiantia pentandra (Hook.) Rydb.	SAXIFRAGACEAE		native	
Pectis papposa Harv. & A. Gray	ASTERACEAE		native	
Pectis papposa Harv. & A. Gray var. papposa	ASTERACEAE	CHINCH-WEED	native	
Pectocarya heterocarpa (I. M. Johnst.) I. M. Johnst.	BORAGINACEAE	MIXED-NUT PECTOCARYA	native	
Pectocarya linearis (Ruiz & Pav.) DC.	BORAGINACEAE		native	
Pectocarya linearis (Ruiz & Pav.) DC. subsp. ferocula (I. M. Johnst.) Thorne	BORAGINACEAE	NARROW-TOOTHED PECTOCARYA	native	
Pectocarya penicillata (Hook. & Arn.) A. DC.	BORAGINACEAE	NORTHERN PECTOCARYA	native	
Pectocarya peninsularis I. M. Johnst.	BORAGINACEAE	BAJA PECTOCARYA	native	
Pectocarya platycarpa (Munz & I. M. Johnst.) Munz & I. M. Johnst.	BORAGINACEAE	WIDE-TOOTHED PECTOCARYA	native	
Pectocarya pusilla (A. DC.) A. Gray	BORAGINACEAE	LITTLE PECTOCARYA	native	
Pectocarya recurvata I. M. Johnst.	BORAGINACEAE	ARCHED-NUT PECTOCARYA	native	
Pectocarya setosa A. Gray	BORAGINACEAE	ROUND-NUT PECTOCARYA	native	
Pedicularis attollens A. Gray	OROBANCHACEAE	LITTLE ELEPHANT'S HEAD	native	
Pedicularis bracteosa Benth.	OROBANCHACEAE		native	
Pedicularis bracteosa Benth. var. flavida (Pennell) Cronquist	OROBANCHACEAE	YELLOWISH LOUSEWORT	native	
Pedicularis centranthera A. Gray	OROBANCHACEAE	GREAT BASIN LOUSEWORT	native	
Pedicularis contorta Benth.	OROBANCHACEAE	CURVED-BEAK LOUSEWORT	native	
Pedicularis crenulata Benth.	OROBANCHACEAE	SCALLOPED-LEAVED LOUSEWORT	native	
Pedicularis densiflora Hook.	OROBANCHACEAE	WARRIOR'S PLUME	native	
Pedicularis dudleyi Elmer	OROBANCHACEAE	DUDLEY'S LOUSEWORT	native	
Pedicularis groenlandica Retz.	OROBANCHACEAE	ELEPHANT'S HEAD	native	
Pedicularis howellii A. Gray	OROBANCHACEAE	HOWELL'S LOUSEWORT	native	
Pedicularis racemosa Douglas ex Benth.	OROBANCHACEAE	LEAFY LOUSEWORT	native	
Pedicularis semibarbata A. Gray	OROBANCHACEAE		native	
Pediomelum californicum (S. Watson) Rydb.	FABACEAE		native	
Pediomelum castoreum (S. Watson) Rydb.	FABACEAE	BEAVER DAM BREADROOT	native	
Peganum harmala L.	NITRARIACEAE	SYRIAN RUE	naturalized	
Pelargonium X hortorum L. H. Bailey	GERANIACEAE	FISH GERANIUM	naturalized	
Pelargonium grossularioides (L.) L'Hér.	GERANIACEAE		naturalized	
Pelargonium inquinans (L.) L'Hér.	GERANIACEAE		naturalized	
Pelargonium panduriforme Eckl. & Zeyher	GERANIACEAE	OAK-LEAVED GERANIUM	naturalized	
Pellaea andromedifolia (Kaulf.) Fée	PTERIDACEAE	COFFEE FERN	native	
Pellaea brachyptera (T. Moore) Baker	PTERIDACEAE	SIERRA CLIFF-BREAK	native	
Pellaea breweri D. C. Eaton	PTERIDACEAE	BREWER'S CLIFF-BREAK	native	
Pellaea bridgesii Hook.	PTERIDACEAE	BRIDGES' CLIFF-BREAK	native	
Pellaea mucronata (D. C. Eaton) D. C. Eaton	PTERIDACEAE	BIRD'S-FOOT FERN	native	
Pellaea mucronata (D. C. Eaton) D. C. Eaton var. californica (Lemmon) Munz & I. M. Johnst.	PTERIDACEAE		native	
Pellaea mucronata (D. C. Eaton) D. C. Eaton var. mucronata	PTERIDACEAE		native	
Pellaea truncata Goodd.	PTERIDACEAE	SPINY CLIFF-BRAKE	native	
Pennisetum ciliare (L.) Link	POACEAE	BUFFEL GRASS	naturalized	
Pennisetum clandestinum Chiov.	POACEAE	KIKUYU GRASS	naturalized	
Pennisetum setaceum (Forssk.) Chiov.	POACEAE	CRIMSON FOUNTAIN GRASS	naturalized	
Pennisetum villosum R. Br. ex Fresen.	POACEAE	FEATHERTOP	naturalized	
Penstemon albomarginatus M. E. Jones	PLANTAGINACEAE	WHITE-MARGINED BEARDTONGUE	native	
Penstemon anguineus Eastw.	PLANTAGINACEAE		native	
Penstemon azureus Benth.	PLANTAGINACEAE		native	
Penstemon azureus Benth. var. angustissimus A. Gray	PLANTAGINACEAE		native	
Penstemon azureus Benth. var. azureus	PLANTAGINACEAE		native	
Penstemon barnebyi N. H. Holmgren	PLANTAGINACEAE	BARNEBY'S BEARDTONGUE	native	
Penstemon bicolor (Brandegee) Clokey & D. D. Keck	PLANTAGINACEAE		native	
Penstemon caesius A. Gray	PLANTAGINACEAE		native	
Penstemon calcareus Brandegee	PLANTAGINACEAE	LIMESTONE BEARDTONGUE	native	
Penstemon californicus (Munz & I. M. Johnst.) D. D. Keck	PLANTAGINACEAE	CALIFORNIA BEARDTONGUE	native	
Penstemon centranthifolius Benth.	PLANTAGINACEAE	SCARLET BUGLER	native	
Penstemon cinicola D. D. Keck	PLANTAGINACEAE	ASH BEARDTONGUE	native	
Penstemon clevelandii A. Gray	PLANTAGINACEAE		native	
Penstemon clevelandii A. Gray var. clevelandii	PLANTAGINACEAE		native	
Penstemon clevelandii A. Gray var. connatus Munz & I. M. Johnst.	PLANTAGINACEAE	SAN JACINTO BEARDTONGUE	native	
Penstemon clevelandii A. Gray var. mohavensis (D. D. Keck) McMinn	PLANTAGINACEAE		native	
Penstemon davidsonii Greene	PLANTAGINACEAE		native	
Penstemon davidsonii Greene var. davidsonii	PLANTAGINACEAE		native	
Penstemon deustus Lindl.	PLANTAGINACEAE	HOT-ROCK PENSTEMON	native	
Penstemon deustus Lindl. var. deustus	PLANTAGINACEAE		native	
Penstemon deustus Lindl. var. pedicellatus M. E. Jones	PLANTAGINACEAE		native	
Penstemon deustus Lindl. var. suffrutescens L. F. Hend.	PLANTAGINACEAE		native	
Penstemon eatonii A. Gray	PLANTAGINACEAE		native	
Penstemon eatonii A. Gray var. eatonii	PLANTAGINACEAE		native	
Penstemon eatonii A. Gray var. undosus M. E. Jones	PLANTAGINACEAE		native	
Penstemon filiformis (D. D. Keck) D. D. Keck	PLANTAGINACEAE	THREAD-LEAVED BEARDTONGUE	native	
Penstemon floridus Brandegee	PLANTAGINACEAE		native	
Penstemon floridus Brandegee var. austinii (Eastw.) N. H. Holmgren	PLANTAGINACEAE		native	
Penstemon floridus Brandegee var. floridus	PLANTAGINACEAE		native	
Penstemon fruticiformis Coville	PLANTAGINACEAE		native	
Penstemon fruticiformis Coville var. amargosae (D. D. Keck) N. H. Holmgren	PLANTAGINACEAE	AMARGOSA BEARDTONGUE	native	
Penstemon fruticiformis Coville var. fruticiformis	PLANTAGINACEAE		native	
Penstemon gracilentus A. Gray	PLANTAGINACEAE		native	
Penstemon grinnellii Eastw.	PLANTAGINACEAE		native	
Penstemon grinnellii Eastw. var. grinnellii	PLANTAGINACEAE		native	
Penstemon grinnellii Eastw. var. scrophularioides (M. E. Jones) N. H. Holmgren	PLANTAGINACEAE		native	
Penstemon heterodoxus A. Gray	PLANTAGINACEAE		native	
Penstemon heterodoxus A. Gray var. cephalophorus (Greene) N. H. Holmgren	PLANTAGINACEAE		native	
Penstemon heterodoxus A. Gray var. heterodoxus	PLANTAGINACEAE		native	
Penstemon heterodoxus A. Gray var. shastensis (D. D. Keck) N. H. Holmgren	PLANTAGINACEAE	SHASTA BEARDTONGUE	native	
Penstemon heterophyllus Lindl.	PLANTAGINACEAE		native	
Penstemon heterophyllus Lindl. var. australis Munz & I. M. Johnst.	PLANTAGINACEAE		native	
Penstemon heterophyllus Lindl. var. heterophyllus	PLANTAGINACEAE		native	
Penstemon heterophyllus Lindl. var. purdyi (D. D. Keck) McMinn	PLANTAGINACEAE		native	
Penstemon humilis A. Gray	PLANTAGINACEAE		native	
Penstemon humilis A. Gray var. humilis	PLANTAGINACEAE		native	
Penstemon incertus Brandegee	PLANTAGINACEAE		native	
Penstemon janishiae N. H. Holmgren	PLANTAGINACEAE	JANISH'S BEARDTONGUE	native	
Penstemon labrosus (A. Gray) Hook. f.	PLANTAGINACEAE		native	
Penstemon laetus A. Gray	PLANTAGINACEAE		native	
Penstemon laetus A. Gray var. laetus	PLANTAGINACEAE		native	
Penstemon laetus A. Gray var. leptosepalus A. Gray	PLANTAGINACEAE		native	
Penstemon laetus A. Gray var. sagittatus (D. D. Keck) McMinn	PLANTAGINACEAE		native	
Penstemon monoensis A. Heller	PLANTAGINACEAE		native	
Penstemon neotericus D. D. Keck	PLANTAGINACEAE	PLUMAS COUNTY BEARDTONGUE	native	
Penstemon newberryi A. Gray	PLANTAGINACEAE		native	
Penstemon newberryi A. Gray var. berryi (Eastw.) N. H. Holmgren	PLANTAGINACEAE		native	
Penstemon newberryi A. Gray var. newberryi	PLANTAGINACEAE		native	
Penstemon newberryi A. Gray var. sonomensis (Greene) Jeps.	PLANTAGINACEAE	SONOMA BEARDTONGUE	native	
Penstemon pahutensis N. H. Holmgren	PLANTAGINACEAE	PAHUTE BEARDTONGUE	native	
Penstemon palmeri A. Gray	PLANTAGINACEAE		native	
Penstemon palmeri A. Gray var. palmeri	PLANTAGINACEAE		native	
Penstemon papillatus J. T. Howell	PLANTAGINACEAE	INYO BEARDTONGUE	native	
Penstemon parvulus (A. Gray) Krautter	PLANTAGINACEAE		native	
Penstemon patens (M. E. Jones) N. H. Holmgren	PLANTAGINACEAE		native	
Penstemon personatus D. D. Keck	PLANTAGINACEAE	CLOSED-THROATED BEARDTONGUE	native	
Penstemon procerus Graham	PLANTAGINACEAE		native	
Penstemon procerus Graham var. brachyanthus (Pennell) Cronquist	PLANTAGINACEAE		native	
Penstemon procerus Graham var. formosus (A. Nelson) Cronquist	PLANTAGINACEAE		native	
Penstemon pseudospectabilis M. E. Jones	PLANTAGINACEAE		native	
Penstemon purpusii Brandegee	PLANTAGINACEAE	SNOW MOUNTAIN BEARDTONGUE	native	
Penstemon rattanii A. Gray	PLANTAGINACEAE		native	
Penstemon rattanii A. Gray var. kleei (Greene) A. Gray	PLANTAGINACEAE	SANTA CRUZ MOUNTAINS BEARDTONGUE	native	
Penstemon rattanii A. Gray var. rattanii	PLANTAGINACEAE		native	
Penstemon roezlii Regel	PLANTAGINACEAE		native	
Penstemon rostriflorus Kellogg	PLANTAGINACEAE		native	
Penstemon rupicola (Piper) Howell	PLANTAGINACEAE		native	
Penstemon rydbergii A. Nelson	PLANTAGINACEAE		native	
Penstemon rydbergii A. Nelson var. oreocharis (Greene) N. H. Holmgren	PLANTAGINACEAE		native	
Penstemon scapoides D. D. Keck	PLANTAGINACEAE	PINYON BEARDTONGUE	native	
Penstemon speciosus Lindl.	PLANTAGINACEAE		native	
Penstemon spectabilis Thurb. ex A. Gray	PLANTAGINACEAE		native	
Penstemon spectabilis Thurb. ex A. Gray var. spectabilis	PLANTAGINACEAE		native	
Penstemon spectabilis Thurb. ex A. Gray var. subviscosus (D. D. Keck) McMinn	PLANTAGINACEAE		native	
Penstemon stephensii Brandegee	PLANTAGINACEAE	STEPHENS' BEARDTONGUE	native	
Penstemon sudans M. E. Jones	PLANTAGINACEAE	SUSANVILLE BEARDTONGUE	native	
Penstemon thompsoniae (A. Gray) Rydb.	PLANTAGINACEAE	THOMPSON'S BEARDTONGUE	native	
Penstemon thurberi Torr.	PLANTAGINACEAE	THURBER'S BEARDTONGUE	native	
Penstemon tracyi D. D. Keck	PLANTAGINACEAE	TRACY'S BEARDTONGUE	native	
Penstemon utahensis Eastw.	PLANTAGINACEAE	UTAH BEARDTONGUE	native	
Penstemon venustus Lindl.	PLANTAGINACEAE		naturalized	
Pentachaeta alsinoides Greene	ASTERACEAE		native	
Pentachaeta aurea Nutt.	ASTERACEAE		native	
Pentachaeta aurea Nutt. subsp. allenii D. J. Keil	ASTERACEAE	ALLEN'S PENTACHAETA	native	
Pentachaeta aurea Nutt. subsp. aurea	ASTERACEAE	GOLDEN-RAYED PENTACHAETA	native	
Pentachaeta bellidiflora Greene	ASTERACEAE	WHITE-RAYED PENTACHAETA	native	
Pentachaeta exilis (A. Gray) A. Gray	ASTERACEAE		native	
Pentachaeta exilis (A. Gray) A. Gray subsp. aeolica Van Horn & Ornduff	ASTERACEAE	SAN BENITO PENTACHAETA	native	
Pentachaeta exilis (A. Gray) A. Gray subsp. exilis	ASTERACEAE		native	
Pentachaeta fragilis Brandegee	ASTERACEAE	FRAGILE PENTACHAETA	native	
Pentachaeta lyonii A. Gray	ASTERACEAE	LYON'S PENTACHAETA	native	
Pentagramma pallida (Weath.) Yatsk., Windham & E. Wollenw.	PTERIDACEAE	SILVERBACK FERN	native	
Pentagramma triangularis (Kaulf.) Yatsk., Windham & E. Wollenw.	PTERIDACEAE	GOLDBACK FERN	native	
Pentagramma triangularis (Kaulf.) Yatsk., Windham & E. Wollenw. subsp. maxonii (Weath.) Yatsk., Windham & E. Wollenw.	PTERIDACEAE		native	
Pentagramma triangularis (Kaulf.) Yatsk., Windham & E. Wollenw. subsp. triangularis	PTERIDACEAE		native	
Pentagramma triangularis (Kaulf.) Yatsk., Windham & E. Wollenw. subsp. viscosa (D. C. Eaton) Yatsk., Windham & E. Wollenw.	PTERIDACEAE		native	
Peraphyllum ramosissimum Nutt.	ROSACEAE		native	
Pericome caudata A. Gray	ASTERACEAE		native	
Perideridia bacigalupii T. I. Chuang & Constance	APIACEAE	BACIGALUPI'S YAMPAH	native	
Perideridia bolanderi (A. Gray) A. Nelson & J. F. Macbr.	APIACEAE		native	
Perideridia bolanderi (A. Gray) A. Nelson & J. F. Macbr. subsp. bolanderi	APIACEAE		native	
Perideridia bolanderi (A. Gray) A. Nelson & J. F. Macbr. subsp. involucrata T. I. Chuang & Constance	APIACEAE		native	
Perideridia californica (Torr.) A. Nelson & J. F. Macbr.	APIACEAE		native	
Perideridia gairdneri (Hook. & Arn.) Mathias	APIACEAE		native	
Perideridia gairdneri (Hook. & Arn.) Mathias subsp. borealis T. I. Chuang & Constance	APIACEAE		native	
Perideridia gairdneri (Hook. & Arn.) Mathias subsp. gairdneri	APIACEAE	GAIRDNER'S YAMPAH	native	
Perideridia howellii (J. M. Coult. & Rose) Mathias	APIACEAE		native	
Perideridia kelloggii (A. Gray) Mathias	APIACEAE		native	
Perideridia lemmonii (J. M. Coult. & Rose) T. I. Chuang & Constance	APIACEAE		native	
Perideridia leptocarpa T. I. Chuang & Constance	APIACEAE	NARROW-SEEDED YAMPAH	native	
Perideridia oregana (S. Watson) Mathias	APIACEAE		native	
Perideridia parishii (J. M. Coult. & Rose) A. Nelson & J. F. Macbr.	APIACEAE		native	
Perideridia parishii (J. M. Coult. & Rose) A. Nelson & J. F. Macbr. subsp. latifolia (A. Gray) T. I. Chuang & Constance	APIACEAE		native	
Perideridia parishii (J. M. Coult. & Rose) A. Nelson & J. F. Macbr. subsp. parishii	APIACEAE	PARISH'S YAMPAH	native	
Perideridia pringlei (J. M. Coult. & Rose) A. Nelson & J. F. Macbr.	APIACEAE	ADOBE YAMPAH	native	
Peritoma arborea (Nutt.) H.H. Iltis	CLEOMACEAE	BLADDERPOD	native	
Peritoma arborea (Nutt.) H.H. Iltis var. angustata (Parish) H.H. Iltis	CLEOMACEAE		native	
Peritoma arborea (Nutt.) H.H. Iltis var. arborea	CLEOMACEAE		native	
Peritoma arborea (Nutt.) H.H. Iltis var. globosa (Coville) H.H. Iltis	CLEOMACEAE		native	
Peritoma jonesii (J.F. Macbr.) H.H. Iltis	CLEOMACEAE	JONES' BEE PLANT	native	
Peritoma lutea (Hook.) Raf.	CLEOMACEAE	YELLOW BEE PLANT	native	
Peritoma platycarpa (Torr.) H.H. Iltis	CLEOMACEAE	GOLDEN BEE PLANT	native	
Peritoma serrulata (Pursh) DC.	CLEOMACEAE	ROCKY MOUNTAIN BEE PLANT	naturalized	
Perityle emoryi Torr.	ASTERACEAE	EMORY'S ROCK DAISY	native	
Perityle intricata (Brandegee) Shinners	ASTERACEAE	DESERT ROCK DAISY	native	
Perityle inyoensis (Ferris) A. M. Powell	ASTERACEAE	INYO ROCK DAISY	native	
Perityle megalocephala (S. Watson) J. F. Macbr.	ASTERACEAE		native	
Perityle megalocephala (S. Watson) J. F. Macbr. var. megalocephala	ASTERACEAE	NEVADA ROCK DAISY	native	
Perityle megalocephala (S. Watson) J. F. Macbr. var. oligophylla A. M. Powell	ASTERACEAE	SMALL-LEAVED ROCK DAISY	native	
Perityle villosa (S. F. Blake) Shinners	ASTERACEAE	HANAUPAH ROCK DAISY	native	
Persicaria amphibia (L.) Delarbre	POLYGONACEAE	WATER SMARTWEED	native	
Persicaria capitata (Buch.-Ham. ex D. Don) H. Gross	POLYGONACEAE		naturalized	
Persicaria hydropiper (L.) Delarbre	POLYGONACEAE	WATERPEPPER	naturalized	
Persicaria hydropiperoides (Michx.) Small	POLYGONACEAE	FALSE WATERPEPPER	native	
Persicaria lapathifolia (L.) Delarbe	POLYGONACEAE	WILLOW WEED	native	
Persicaria maculosa Gray	POLYGONACEAE	LADY'S THUMB	naturalized	
Persicaria pensylvanica (L.) M. Gómez	POLYGONACEAE	PINKWEED	naturalized	
Persicaria punctata (Elliott) Small	POLYGONACEAE		native	
Persicaria wallichii Greuter & Burdet	POLYGONACEAE	HIMALAYAN KNOTWEED	naturalized	
Petalonyx linearis Greene	LOASACEAE		native	
Petalonyx nitidus S. Watson	LOASACEAE		native	
Petalonyx thurberi A. Gray	LOASACEAE		native	
Petalonyx thurberi A. Gray subsp. gilmanii (Munz) W. S. Davis & H. J. Thomps.	LOASACEAE	DEATH VALLEY SANDPAPER-PLANT	native	
Petalonyx thurberi A. Gray subsp. thurberi	LOASACEAE		native	
Petasites frigidus (L.) Fr.	ASTERACEAE		native	
Petasites frigidus (L.) Fr. var. palmatus (Aiton) Cronquist	ASTERACEAE	WESTERN SWEET COLTSFOOT	native	
Peteria thompsoniae S. Watson	FABACEAE	SPINE-NODED MILKVETCH	native	
Petradoria pumila (Nutt.) Greene	ASTERACEAE		native	
Petradoria pumila (Nutt.) Greene var. pumila	ASTERACEAE	ROCK-GOLDENROD	native	
Petrophytum caespitosum (Nutt.) Rydb.	ROSACEAE		native	
Petrophytum caespitosum (Nutt.) Rydb. subsp. acuminatum (Rydb.) Munz	ROSACEAE		native	
Petrophytum caespitosum (Nutt.) Rydb. subsp. caespitosum	ROSACEAE		native	
Petrorhagia dubia (Raf.) G. López & Romo	CARYOPHYLLACEAE		naturalized	
Petrorhagia nanteuilii (Burnat) P. W. Ball & Heywood	CARYOPHYLLACEAE		naturalized	
Petrorhagia prolifera (L.) P. W. Ball & Heywood	CARYOPHYLLACEAE		naturalized	
Petunia parviflora Juss.	SOLANACEAE		native	
Petunia violacea Lindl.	SOLANACEAE		naturalized	acceptance uncertain
Peucephyllum schottii A. Gray	ASTERACEAE		native	
Phacelia adenophora J. T. Howell	BORAGINACEAE		native	
Phacelia affinis A. Gray	BORAGINACEAE		native	
Phacelia anelsonii J. F. Macbr.	BORAGINACEAE	AVEN NELSON'S PHACELIA	native	
Phacelia argentea A. Nelson & J.F. Macbr.	BORAGINACEAE	SANDDUNE PHACELIA	native	
Phacelia austromontana J. T. Howell	BORAGINACEAE		native	
Phacelia barnebyana J. T. Howell	BORAGINACEAE	BARNEBY'S PHACELIA	native	
Phacelia bicolor S. Watson var. bicolor	BORAGINACEAE		native	
Phacelia bicolor Torr. ex S. Watson	BORAGINACEAE		native	
Phacelia bolanderi A. Gray	BORAGINACEAE		native	
Phacelia brachyloba (Benth.) A. Gray	BORAGINACEAE		native	
Phacelia breweri A. Gray	BORAGINACEAE		native	
Phacelia californica Cham.	BORAGINACEAE		native	
Phacelia calthifolia Brand	BORAGINACEAE		native	
Phacelia campanularia A. Gray	BORAGINACEAE	DESERT BLUEBELLS	native	
Phacelia campanularia A. Gray var. campanularia	BORAGINACEAE		native	
Phacelia campanularia A. Gray var. vasiformis (G.W. Gillett) Walden & R.Patt.	BORAGINACEAE		native	
Phacelia cicutaria Greene	BORAGINACEAE		native	
Phacelia cicutaria Greene var. cicutaria	BORAGINACEAE		native	
Phacelia cicutaria Greene var. hispida (A. Gray) J. T. Howell	BORAGINACEAE		native	
Phacelia ciliata Benth.	BORAGINACEAE		native	
Phacelia coerulea Greene	BORAGINACEAE	SKY-BLUE PHACELIA	native	
Phacelia congdonii Greene	BORAGINACEAE		native	
Phacelia cookei Constance & Heckard	BORAGINACEAE	COOKE'S PHACELIA	native	
Phacelia corymbosa Jeps.	BORAGINACEAE		native	
Phacelia crenulata Torr. ex S. Watson	BORAGINACEAE		native	
Phacelia crenulata Torr. ex S. Watson var. ambigua (M. E. Jones) J. F. Macbr.	BORAGINACEAE		native	
Phacelia crenulata Torr. ex S. Watson var. crenulata	BORAGINACEAE		native	
Phacelia crenulata Torr. ex S. Watson var. minutiflora (J. W. Voss ex Munz) Jeps.	BORAGINACEAE		native	
Phacelia cryptantha Greene	BORAGINACEAE		native	
Phacelia curvipes Torr. ex S. Watson	BORAGINACEAE		native	
Phacelia dalesiana J. T. Howell	BORAGINACEAE	SCOTT MOUNTAIN PHACELIA	native	
Phacelia davidsonii A. Gray	BORAGINACEAE		native	
Phacelia distans Benth.	BORAGINACEAE		native	
Phacelia divaricata (Benth.) A. Gray	BORAGINACEAE		native	
Phacelia douglasii (Benth.) Torr.	BORAGINACEAE		native	
Phacelia egena (Brand) J. T. Howell	BORAGINACEAE		native	
Phacelia eisenii Brandegee	BORAGINACEAE		native	
Phacelia exilis (A. Gray) G. J. Lee	BORAGINACEAE	TRANSVERSE RANGE PHACELIA	native	
Phacelia floribunda Greene	BORAGINACEAE	MANY-FLOWERED PHACELIA	native	
Phacelia fremontii Torr.	BORAGINACEAE		native	
Phacelia glandulifera Piper	BORAGINACEAE		native	
Phacelia grandiflora (Benth.) A. Gray	BORAGINACEAE		native	
Phacelia greenei J. T. Howell	BORAGINACEAE	SCOTT VALLEY PHACELIA	native	
Phacelia grisea A. Gray	BORAGINACEAE		native	
Phacelia gymnoclada Torr. ex S. Watson	BORAGINACEAE	NAKED-STEMMED PHACELIA	native	
Phacelia hastata Douglas ex Lehm.	BORAGINACEAE		native	
Phacelia hastata Douglas ex Lehm. var. compacta (Brand) Cronquist	BORAGINACEAE		native	
Phacelia hastata Douglas ex Lehm. var. hastata	BORAGINACEAE		native	
Phacelia heterophylla Pursh	BORAGINACEAE		native	
Phacelia heterophylla Pursh var. virgata (Greene) R. D. Dorn	BORAGINACEAE		native	
Phacelia hubbyi (J.F. Macbr.) L.M. Garrison	BORAGINACEAE		native	
Phacelia humilis Torr. & A. Gray	BORAGINACEAE		native	
Phacelia humilis Torr. & A. Gray var. dudleyi J. T. Howell	BORAGINACEAE		native	
Phacelia humilis Torr. & A. Gray var. humilis	BORAGINACEAE		native	
Phacelia hydrophylloides Torr. ex A. Gray	BORAGINACEAE		native	
Phacelia imbricata Greene	BORAGINACEAE		native	
Phacelia imbricata Greene var. bernardina (Greene) Walden & R. Patt.	BORAGINACEAE		native	
Phacelia imbricata Greene var. imbricata	BORAGINACEAE		native	
Phacelia imbricata Greene var. patula (Brand) Walden & R. Patt.	BORAGINACEAE		native	
Phacelia insularis Munz	BORAGINACEAE		native	
Phacelia insularis Munz var. continentis J. T. Howell	BORAGINACEAE	NORTH COAST PHACELIA	native	
Phacelia insularis Munz var. insularis	BORAGINACEAE	NORTHERN CHANNEL ISLANDS PHACELIA	native	
Phacelia inundata J. T. Howell	BORAGINACEAE	PLAYA PHACELIA	native	
Phacelia inyoensis (J. F. Macbr.) J. T. Howell	BORAGINACEAE	INYO PHACELIA	native	
Phacelia ivesiana Torr.	BORAGINACEAE		native	
Phacelia keckii Munz & I.M. Johnst.	BORAGINACEAE	SANTIAGO PEAK PHACELIA	native	
Phacelia lemmonii A. Gray	BORAGINACEAE		native	
Phacelia leonis J. T. Howell	BORAGINACEAE	SISKIYOU PHACELIA	native	
Phacelia linearis (Pursh) Holz.	BORAGINACEAE		native	
Phacelia longipes Torr. ex A. Gray	BORAGINACEAE		native	
Phacelia lyonii A. Gray	BORAGINACEAE		native	
Phacelia malvifolia Cham.	BORAGINACEAE		native	
Phacelia malvifolia Cham. var. loasifolia (Benth.) Brand	BORAGINACEAE		native	
Phacelia malvifolia Cham. var. malvifolia	BORAGINACEAE		native	
Phacelia marcescens Eastw. ex J. F. Macbr.	BORAGINACEAE		native	
Phacelia minor (Harv.) Thell. ex F. Zimm.	BORAGINACEAE	WILD CANTERBURY BELLS	native	
Phacelia mohavensis A. Gray	BORAGINACEAE	MOJAVE PHACELIA	native	
Phacelia monoensis Halse	BORAGINACEAE	MONO COUNTY PHACELIA	native	
Phacelia mustelina Coville	BORAGINACEAE	DEATH VALLEY ROUND-LEAVED PHACELIA	native	
Phacelia mutabilis Greene	BORAGINACEAE		native	
Phacelia nashiana Jeps.	BORAGINACEAE	CHARLOTTE'S PHACELIA	native	
Phacelia neglecta M. E. Jones	BORAGINACEAE		native	
Phacelia nemoralis Greene	BORAGINACEAE		native	
Phacelia nemoralis Greene var. nemoralis	BORAGINACEAE		native	
Phacelia nemoralis Greene var. oregonensis (Heckard) Walden & R. Patt.	BORAGINACEAE		native	
Phacelia novenmillensis Munz	BORAGINACEAE	NINE MILE CANYON PHACELIA	native	
Phacelia orogenes Brand	BORAGINACEAE	MOUNTAIN PHACELIA	native	
Phacelia pachyphylla A. Gray	BORAGINACEAE		native	
Phacelia parishii A. Gray	BORAGINACEAE	PARISH'S PHACELIA	native	
Phacelia parryi Torr.	BORAGINACEAE		native	
Phacelia pedicellata A. Gray	BORAGINACEAE		native	
Phacelia peirsoniana J. T. Howell	BORAGINACEAE	PEIRSON'S PHACELIA	native	
Phacelia perityloides Coville	BORAGINACEAE		native	
Phacelia perityloides Coville var. jaegeri Munz	BORAGINACEAE	JAEGER'S PHACELIA	native	
Phacelia perityloides Coville var. perityloides	BORAGINACEAE		native	
Phacelia phacelioides (Benth.) Brand	BORAGINACEAE	MOUNT DIABLO PHACELIA	native	
Phacelia platyloba A. Gray	BORAGINACEAE		native	
Phacelia pringlei A. Gray	BORAGINACEAE		native	
Phacelia procera A. Gray	BORAGINACEAE		native	
Phacelia pulchella A. Gray	BORAGINACEAE		native	
Phacelia pulchella A. Gray var. gooddingii (Brand) J. T. Howell	BORAGINACEAE	GOODDING'S PHACELIA	native	
Phacelia purpusii Brandegee	BORAGINACEAE		native	
Phacelia quickii J. T. Howell	BORAGINACEAE		native	
Phacelia racemosa (Kellogg) Brandegee	BORAGINACEAE		native	
Phacelia ramosissima Douglas ex Lehm.	BORAGINACEAE		native	
Phacelia rattanii A. Gray	BORAGINACEAE		native	
Phacelia rotundifolia Torr. ex S. Watson	BORAGINACEAE		native	
Phacelia saxicola A. Gray	BORAGINACEAE		native	
Phacelia sericea (Graham) A. Gray	BORAGINACEAE		native	
Phacelia sericea (Graham) A. Gray var. ciliosa Rydb.	BORAGINACEAE	BLUE ALPINE PHACELIA	native	
Phacelia stebbinsii Constance & Heckard	BORAGINACEAE	STEBBINS' PHACELIA	native	
Phacelia stellaris Brand	BORAGINACEAE	BRAND'S STAR PHACELIA	native	
Phacelia suaveolens Greene	BORAGINACEAE		native	
Phacelia tanacetifolia Benth.	BORAGINACEAE		native	
Phacelia tetramera J. T. Howell	BORAGINACEAE		native	
Phacelia thermalis Greene	BORAGINACEAE		native	
Phacelia umbrosa Greene	BORAGINACEAE		native	
Phacelia vallicola Congdon ex Brand	BORAGINACEAE	MARIPOSA PHACELIA	native	
Phacelia vallis-mortae J. W. Voss	BORAGINACEAE		native	
Phacelia viscida (Benth. ex Lindl.) Torr.	BORAGINACEAE		native	
Phacelia viscida (Benth. ex Lindl.) Torr. var. albiflora (Nutt.) A. Gray	BORAGINACEAE		native	
Phacelia viscida (Benth. ex Lindl.) Torr. var. viscida	BORAGINACEAE		native	
Phalacroseris bolanderi A. Gray	ASTERACEAE	BOLANDER'S MOCK DANDELION	native	
Phalaris angusta Nees ex Trin.	POACEAE	TIMOTHY CANARY GRASS	native	
Phalaris aquatica L.	POACEAE	HARDING GRASS	naturalized	
Phalaris arundinacea L.	POACEAE	REED CANARY GRASS	native	
Phalaris brachystachys Link	POACEAE	SHORT-SPIKED CANARY GRASS	naturalized	
Phalaris californica Hook. & Arn.	POACEAE	CALIFORNIA CANARY GRASS	native	
Phalaris canariensis L.	POACEAE	CANARY GRASS	naturalized	
Phalaris caroliniana Walter	POACEAE	CAROLINA CANARY GRASS	naturalized	
Phalaris coerulescens Desf.	POACEAE	SUNOL GRASS	naturalized	
Phalaris lemmonii Vasey	POACEAE	LEMMON'S CANARY GRASS	native	
Phalaris minor Retz.	POACEAE	LITTLE-SEEDED CANARY GRASS	naturalized	
Phalaris paradoxa L.	POACEAE	HOOD CANARY GRASS	naturalized	
Phaseolus filiformis Benth.	FABACEAE	SLENDER-STEM BEAN	native	
Philadelphus lewisii Pursh	HYDRANGEACEAE	WILD MOCK ORANGE	native	
Philadelphus microphyllus A. Gray	HYDRANGEACEAE	LITTLELEAF MOCK ORANGE	native	
Phleum alpinum L.	POACEAE	MOUNTAIN TIMOTHY	native	
Phleum pratense L.	POACEAE	CULTIVATED TIMOTHY	naturalized	
Phlox adsurgens Torr. ex A. Gray	POLEMONIACEAE		native	
Phlox austromontana Coville	POLEMONIACEAE		native	
Phlox condensata (A. Gray) E. E. Nelson	POLEMONIACEAE		native	
Phlox diffusa Benth.	POLEMONIACEAE		native	
Phlox dispersa Sharsm.	POLEMONIACEAE	HIGH SIERRA PHLOX	native	
Phlox dolichantha A. Gray	POLEMONIACEAE	BIG BEAR VALLEY PHLOX	native	
Phlox douglasii Hook.	POLEMONIACEAE		native	
Phlox hirsuta E. E. Nelson	POLEMONIACEAE	YREKA PHLOX	native	
Phlox hoodii Richardson	POLEMONIACEAE		native	
Phlox hoodii Richardson subsp. canescens (Torr. & A. Gray) Wherry	POLEMONIACEAE		native	
Phlox muscoides Nutt.	POLEMONIACEAE	SQUARESTEM PHLOX	native	
Phlox pulvinata (Wherry) Cronquist	POLEMONIACEAE		native	
Phlox speciosa Pursh	POLEMONIACEAE		native	
Phlox stansburyi (Torr.) A. Heller	POLEMONIACEAE		native	
Phlox stansburyi (Torr.) A. Heller subsp. stansburyi	POLEMONIACEAE		native	
Phlox stansburyi (Torr.) A. Heller subsp. superba (Brand) Wherry	POLEMONIACEAE		native	
Phlox stansburyi (Torr.) A. Heller var. brevifolia (A. Gray) E.E. Nelson	POLEMONIACEAE		native	
Phoenicaulis cheiranthoides Nutt.	BRASSICACEAE		native	
Phoenix canariensis Chabaud	ARECACEAE	CANARY ISLAND PALM	naturalized	
Pholisma arenarium Nutt. ex Hook.	BORAGINACEAE		native	
Pholisma sonorae (Torr. ex A. Gray) Yatsk.	BORAGINACEAE	SAND FOOD	native	
Pholistoma auritum (Lindl.) Lilja	BORAGINACEAE		native	
Pholistoma auritum (Lindl.) Lilja var. arizonicum (M. E. Jones) Constance	BORAGINACEAE	ARIZONA PHOLISTOMA	native	
Pholistoma auritum (Lindl.) Lilja var. auritum	BORAGINACEAE	FIESTA FLOWER	native	
Pholistoma membranaceum (Benth.) Constance	BORAGINACEAE		native	
Pholistoma racemosum (Nutt. ex A. Gray) Constance	BORAGINACEAE		native	
Phoradendron bolleanum (Seem.) Eichler	VISCACEAE		native	
Phoradendron californicum Nutt.	VISCACEAE	DESERT MISTLETOE	native	
Phoradendron juniperinum A. Gray	VISCACEAE	INCENSE CEDAR MISTLETOE	native	
Phoradendron leucarpum (Raf.) Reveal & M.C. Johnst.	VISCACEAE		native	
Phoradendron leucarpum (Raf.) Reveal & M.C. Johnst. subsp. macrophyllum (Engelm.) J. R. Abbott & R. L. Thomps.	VISCACEAE		native	
Phoradendron leucarpum (Raf.) Reveal & M.C. Johnst. subsp. tomentosum (DC.) J. R. Abbott & R. L. Thomps.	VISCACEAE		native	
Phragmites australis (Cav.) Steud.	POACEAE	COMMON REED	native	
Phyla lanceolata (Michx.) Greene	VERBENACEAE		native	
Phyla nodiflora (L.) Greene	VERBENACEAE		native	
Phyllodoce breweri (A. Gray) Maxim.	ERICACEAE		native	
Phyllodoce empetriformis (Sm.) D. Don	ERICACEAE		native	
Phyllospadix scouleri Hook.	ZOSTERACEAE		native	
Phyllospadix torreyi S. Watson	ZOSTERACEAE		native	
Physalis acutifolia (Miers) Sandwith	SOLANACEAE		native	
Physalis crassifolia Benth.	SOLANACEAE		native	
Physalis hederifolia A. Gray	SOLANACEAE		native	
Physalis hederifolia A. Gray var. fendleri (A. Gray) Cronquist	SOLANACEAE		native	
Physalis hederifolia A. Gray var. palmeri (A. Gray) C. L. Hitchc.	SOLANACEAE		native	
Physalis lancifolia Nees	SOLANACEAE		naturalized	
Physalis lobata Torr.	SOLANACEAE	LOBED GROUND-CHERRY	native	
Physalis philadelphica Lam.	SOLANACEAE	TOMATILLO	naturalized	
Physalis pubescens L.	SOLANACEAE		naturalized	
Physalis pubescens L. var. grisea Waterf.	SOLANACEAE		naturalized	
Physalis pubescens L. var. integrifolia (Dunal) Waterf.	SOLANACEAE		naturalized	
Physaria chambersii Rollins	BRASSICACEAE	CHAMBERS' PHYSARIA	native	
Physaria cordiformis Rollins	BRASSICACEAE		native	
Physaria kingii (S. Watson) O'Kane & Al-Shehbaz	BRASSICACEAE		native	
Physaria kingii (S. Watson) O'Kane & Al-Shehbaz subsp. bernardina (Munz) O'Kane & Al-Shehbaz	BRASSICACEAE	SAN BERNARDINO MOUNTAINS BLADDERPOD	native	
Physaria kingii (S. Watson) O'Kane & Al-Shehbaz subsp. kingii	BRASSICACEAE		native	
Physaria kingii (S. Watson) O'Kane & Al-Shehbaz subsp. latifolia (A. Nelson) O'Kane & Al-Shehbaz	BRASSICACEAE		native	
Physaria ludoviciana (Nutt.) O'Kane & Al-Shehbaz	BRASSICACEAE	SILVER BLADDERPOD	native	
Physaria occidentalis (S. Watson) O'Kane & Al-Shehbaz	BRASSICACEAE		native	
Physaria occidentalis (S. Watson) O'Kane & Al-Shehbaz subsp. occidentalis	BRASSICACEAE		native	
Physaria tenella (A. Nelson) O'Kane & Al-Shehbaz	BRASSICACEAE		native	
Physocarpus alternans (M. E. Jones) J. T. Howell	ROSACEAE	NEVADA NINEBARK	native	
Physocarpus capitatus (Pursh) Kuntze	ROSACEAE		native	
Phytolacca americana L.	PHYTOLACCACEAE		naturalized	
Phytolacca americana L. var. americana	PHYTOLACCACEAE	POKEWEED	naturalized	
Phytolacca icosandra L.	PHYTOLACCACEAE	TROPICAL POKEWEED	naturalized	
Picea breweriana S. Watson	PINACEAE	BREWER SPRUCE	native	
Picea engelmannii Engelm.	PINACEAE	ENGELMANN SPRUCE	native	
Picea sitchensis (Bong.) Carrière	PINACEAE	SITKA SPRUCE	native	
Pickeringia montana Nutt.	FABACEAE	CHAPARRAL PEA	native	
Pickeringia montana Nutt. var. montana	FABACEAE		native	
Pickeringia montana Nutt. var. tomentosa (Abrams) I. M. Johnst.	FABACEAE	WOOLLY CHAPARRAL PEA	native	
Pilostyles thurberi A. Gray	APODANTHACEAE	THURBER'S PILOSTYLES	native	
Pilularia americana A. Braun	MARSILEACEAE		native	
Pinguicula macroceras Link	LENTIBULARIACEAE	HORNED BUTTERWORT	native	
Pinus albicaulis Engelm.	PINACEAE	WHITEBARK PINE	native	
Pinus attenuata Lemmon	PINACEAE	KNOBCONE PINE	native	
Pinus balfouriana Grev. & Balf.	PINACEAE	FOXTAIL PINE	native	
Pinus balfouriana Grev. & Balf. subsp. austrina R. J. Mastrog. & J. D. Mastrog.	PINACEAE		native	
Pinus balfouriana Grev. & Balf. subsp. balfouriana	PINACEAE		native	
Pinus contorta Loudon	PINACEAE		native	
Pinus contorta Loudon subsp. bolanderi (Parl.) Critchf.	PINACEAE	BOLANDER'S BEACH PINE	native	
Pinus contorta Loudon subsp. contorta	PINACEAE	SHORE PINE	native	
Pinus contorta Loudon subsp. murrayana (Grev. & Balf.) Critchf.	PINACEAE	LODGEPOLE PINE	native	
Pinus coulteri D. Don	PINACEAE	COULTER PINE	native	
Pinus edulis Engelm.	PINACEAE	COLORADO PINYON	native	
Pinus flexilis E. James	PINACEAE	LIMBER PINE	native	
Pinus jeffreyi Grev. & Balf.	PINACEAE	JEFFREY PINE	native	
Pinus lambertiana Douglas	PINACEAE	SUGAR PINE	native	
Pinus longaeva D. K. Bailey	PINACEAE	BRISTLECONE PINE	native	
Pinus monophylla Torr. & Frém.	PINACEAE	SINGLELEAF PINYON PINE	native	
Pinus monticola Douglas ex D. Don	PINACEAE	WESTERN WHITE PINE	native	
Pinus muricata D. Don	PINACEAE	BISHOP PINE	native	
Pinus pinea L.	PINACEAE		naturalized	
Pinus ponderosa Douglas ex Lawson & C. Lawson	PINACEAE	WESTERN YELLOW PINE	native	
Pinus ponderosa Douglas ex Lawson & C. Lawson var. pacifica J. R. Haller & Vivrette	PINACEAE	PACIFIC PONDEROSA PINE	native	
Pinus ponderosa Douglas ex Lawson & C. Lawson var. ponderosa	PINACEAE	NORTH PLATEAU PONDEROSA PINE	native	
Pinus quadrifolia Parl. ex Sudw.	PINACEAE	PARRY PINYON PINE	native	
Pinus radiata D. Don	PINACEAE	MONTEREY PINE	native	
Pinus sabiniana D. Don	PINACEAE	FOOTHILL PINE	native	
Pinus torreyana Parry ex Carrière	PINACEAE		native	
Pinus torreyana Parry ex Carrière subsp. insularis J. R. Haller	PINACEAE	SANTA ROSA ISLAND TORREY PINE	native	
Pinus torreyana Parry ex Carrière subsp. torreyana	PINACEAE	TORREY PINE	native	
Piperia candida Rand. Morgan & Ackerman	ORCHIDACEAE	WHITE-FLOWERED REIN-ORCHID	native	
Piperia colemanii Rand. Morgan & Glicenstein	ORCHIDACEAE	COLEMAN'S REIN-ORCHID	native	
Piperia cooperi (S. Watson) Rydb.	ORCHIDACEAE	CHAPARRAL REIN-ORCHID	native	
Piperia elegans (Lindl.) Rydb.	ORCHIDACEAE		native	
Piperia elegans (Lindl.) Rydb. subsp. decurtata Rand. Morgan & Glicenstein	ORCHIDACEAE	POINT REYES REIN-ORCHID	native	
Piperia elegans (Lindl.) Rydb. subsp. elegans	ORCHIDACEAE	ELEGANT PIPERIA	native	
Piperia elongata Rydb.	ORCHIDACEAE	WOOD REIN-ORCHID	native	
Piperia leptopetala Rydb.	ORCHIDACEAE	NARROW-PETALED REIN-ORCHID	native	
Piperia michaelii (Greene) Rydb.	ORCHIDACEAE	MICHAEL'S REIN-ORCHID	native	
Piperia transversa Suksd.	ORCHIDACEAE	FLAT SPURRED PIPERIA	native	
Piperia unalascensis (Spreng.) Rydb.	ORCHIDACEAE	SLENDER-SPIRE ORCHID	native	
Piperia yadonii Rand. Morgan & Ackerman	ORCHIDACEAE	YADON'S REIN-ORCHID	native	
Pistacia atlantica Desf.	ANACARDIACEAE		naturalized	
Pisum sativum L.	FABACEAE	COMMON PEA	naturalized	
Pittosporum crassifolium Banks & Sol.	PITTOSPORACEAE		naturalized	
Pittosporum tobira (Thunb.) Aiton	PITTOSPORACEAE	MOCK ORANGE	naturalized	
Pittosporum undulatum Vent.	PITTOSPORACEAE	MOCK ORANGE	naturalized	
Pityopus californicus (Eastw.) H. F. Copel.	ERICACEAE	CALIFORNIA PINEFOOT	native	
Plagiobothrys acanthocarpus (Piper) I. M. Johnst.	BORAGINACEAE	ADOBE POPCORNFLOWER	native	
Plagiobothrys arizonicus (A. Gray) A. Gray	BORAGINACEAE	ARIZONA POPCORNFLOWER	native	
Plagiobothrys austiniae (Greene) I. M. Johnst.	BORAGINACEAE	AUSTIN'S SPINY-NUT POPCORNFLOWER	native	
Plagiobothrys bracteatus (Howell) I. M. Johnst.	BORAGINACEAE	BRACTED POPCORNFLOWER	native	
Plagiobothrys canescens Benth.	BORAGINACEAE		native	
Plagiobothrys canescens Benth. var. canescens	BORAGINACEAE	VALLEY POPCORNFLOWER	native	
Plagiobothrys canescens Benth. var. catalinensis (A. Gray) Jeps.	BORAGINACEAE	SANTA CATALINA POPCORNFLOWER	native	
Plagiobothrys chorisianus (Cham.) I. M. Johnst.	BORAGINACEAE	ARTIST'S POPCORNFLOWER	native	
Plagiobothrys chorisianus (Cham.) I. M. Johnst. var. chorisianus	BORAGINACEAE	CHORIS' POPCORNFLOWER	native	
Plagiobothrys chorisianus (Cham.) I. M. Johnst. var. hickmanii (Greene) I. M. Johnst.	BORAGINACEAE	HICKMAN'S POPCORNFLOWER	native	
Plagiobothrys cognatus (Greene) I. M. Johnst.	BORAGINACEAE	COGNATE POPCORNFLOWER	native	
Plagiobothrys collinus (Phil.) I. M. Johnst.	BORAGINACEAE		native	
Plagiobothrys collinus (Phil.) I. M. Johnst. var. californicus (A. Gray) Higgins	BORAGINACEAE	CALIFORNIA POPCORNFLOWER	native	
Plagiobothrys collinus (Phil.) I. M. Johnst. var. fulvescens (I. M. Johnst.) Higgins	BORAGINACEAE	ROUGH-STEMMED POPCORNFLOWER	native	
Plagiobothrys collinus (Phil.) I. M. Johnst. var. gracilis (I. M. Johnst.) Higgins	BORAGINACEAE	SAN DIEGO POPCORNFLOWER	native	
Plagiobothrys collinus (Phil.) I. M. Johnst. var. ursinus (A. Gray) Higgins	BORAGINACEAE	BEAR VALLEY POPCORNFLOWER	native	
Plagiobothrys cusickii (Greene) I. M. Johnst.	BORAGINACEAE	CUSICK'S POPCORNFLOWER	native	
Plagiobothrys diffusus (Greene) I. M. Johnst.	BORAGINACEAE	SAN FRANCISCO POPCORNFLOWER	native	
Plagiobothrys distantiflorus (Piper) I. M. Johnst.	BORAGINACEAE	MADERA POPCORNFLOWER	native	
Plagiobothrys fulvus (Hook. & Arn.) I. M. Johnst.	BORAGINACEAE		native	
Plagiobothrys fulvus (Hook. & Arn.) I. M. Johnst. var. campestris (Greene) I. M. Johnst.	BORAGINACEAE	FIELD POPCORNFLOWER	native	
Plagiobothrys glyptocarpus (Piper) I. M. Johnst.	BORAGINACEAE	SCULPTURED-NUT POPCORNFLOWER	native	
Plagiobothrys glyptocarpus (Piper) I. M. Johnst. var. glyptocarpus	BORAGINACEAE		native	
Plagiobothrys glyptocarpus (Piper) I. M. Johnst. var. modestus I. M. Johnst.	BORAGINACEAE	CEDAR RIDGE POPCORNFLOWER	native	
Plagiobothrys greenei (A. Gray) I. M. Johnst.	BORAGINACEAE	GREENE'S SPINY-NUT POPCORNFLOWER	native	
Plagiobothrys hispidulus (Greene) I. M. Johnst.	BORAGINACEAE	HARSH POPCORNFLOWER	native	
Plagiobothrys hispidus A. Gray	BORAGINACEAE	BRISTLY POPCORNFLOWER	native	
Plagiobothrys humistratus (Greene) I. M. Johnst.	BORAGINACEAE	LOW POPCORNFLOWER	native	
Plagiobothrys hystriculus (Piper) I. M. Johnst.	BORAGINACEAE	BEARDED POPCORNFLOWER	native	
Plagiobothrys infectivus I. M. Johnst.	BORAGINACEAE	DYE POPCORNFLOWER	native	
Plagiobothrys jonesii A. Gray	BORAGINACEAE	MOJAVE POPCORNFLOWER	native	
Plagiobothrys kingii (S. Watson) A. Gray	BORAGINACEAE	GREAT BASIN POPCORNFLOWER	native	
Plagiobothrys kingii (S. Watson) A. Gray var. harknessii (Greene) Jeps.	BORAGINACEAE	NORTHERN GREAT BASIN POPCORNFLOWER	native	
Plagiobothrys kingii (S. Watson) A. Gray var. kingii	BORAGINACEAE	SOUTHERN GREAT BASIN POPCORNFLOWER	native	
Plagiobothrys leptocladus (Greene) I. M. Johnst.	BORAGINACEAE	ALKALI PLAGIOBOTHRYS	native	
Plagiobothrys mollis (A. Gray) I. M. Johnst.	BORAGINACEAE	SOFT POPCORNFLOWER	native	
Plagiobothrys mollis (A. Gray) I. M. Johnst. var. mollis	BORAGINACEAE		native	
Plagiobothrys nitens (Greene) I.M. Johnst.	BORAGINACEAE	SHINY-NUTLET POPCORNFLOWER	native	
Plagiobothrys nothofulvus (A. Gray) A. Gray	BORAGINACEAE	FOOTHILL SNOWDROPS	native	
Plagiobothrys parishii I. M. Johnst.	BORAGINACEAE	PARISH'S POPCORNFLOWER	native	
Plagiobothrys reticulatus (Piper) I. M. Johnst.	BORAGINACEAE	TRACY'S POPCORNFLOWER	native	
Plagiobothrys reticulatus (Piper) I. M. Johnst. var. reticulatus	BORAGINACEAE		native	
Plagiobothrys reticulatus (Piper) I. M. Johnst. var. rossianorum I. M. Johnst.	BORAGINACEAE	FORT ROSS POPCORNFLOWER	native	
Plagiobothrys salsus (Brandegee) I. M. Johnst.	BORAGINACEAE	DESERT POPCORNFLOWER	native	
Plagiobothrys scriptus (Greene) I. M. Johnst.	BORAGINACEAE	SCRIDGEE'S POPCORNFLOWER	native	
Plagiobothrys shastensis A. Gray	BORAGINACEAE	SHASTA POPCORNFLOWER	native	
Plagiobothrys stipitatus (Greene) I. M. Johnst.	BORAGINACEAE	GREAT VALLEY POPCORNFLOWER	native	
Plagiobothrys stipitatus (Greene) I. M. Johnst. var. micranthus (Piper) I. M. Johnst.	BORAGINACEAE		native	
Plagiobothrys stipitatus (Greene) I. M. Johnst. var. stipitatus	BORAGINACEAE	SHOWY GREAT VALLEY POPCORNFLOWER	native	
Plagiobothrys strictus (Greene) I. M. Johnst.	BORAGINACEAE	CALISTOGA POPCORNFLOWER	native	
Plagiobothrys tenellus (Nutt. ex Hook.) A. Gray	BORAGINACEAE	PACIFIC POPCORNFLOWER	native	
Plagiobothrys tener (Greene) I. M. Johnst.	BORAGINACEAE	SLENDER POPCORNFLOWER	native	
Plagiobothrys tener (Greene) I. M. Johnst. var. subglaber I. M. Johnst.	BORAGINACEAE	SERPENTINE POPCORNFLOWER	native	
Plagiobothrys tener (Greene) I. M. Johnst. var. tener	BORAGINACEAE		native	
Plagiobothrys torreyi (A. Gray) A. Gray	BORAGINACEAE	HIGH SIERRA POPCORNFLOWER	native	
Plagiobothrys torreyi (A. Gray) A. Gray var. diffusus I. M. Johnst.	BORAGINACEAE		native	
Plagiobothrys torreyi (A. Gray) A. Gray var. perplexans I. M. Johnst.	BORAGINACEAE	CHAPARRAL POPCORNFLOWER	native	
Plagiobothrys torreyi (A. Gray) A. Gray var. torreyi	BORAGINACEAE	YOSEMITE POPCORNFLOWER	native	
Plagiobothrys trachycarpus (A. Gray) I. M. Johnst.	BORAGINACEAE	ROUGH-NUTLET POPCORNFLOWER	native	
Plagiobothrys uncinatus J. T. Howell	BORAGINACEAE	HOOKED POPCORNFLOWER	native	
Plagiobothrys undulatus (Piper) I. M. Johnst.	BORAGINACEAE	WAVY-STEMMED POPCORNFLOWER	native	
Plagiobothrys verrucosus (Phil.) I.M. Johnst.	BORAGINACEAE	FORGET-ME-NOT POPCORNFLOWER	native	
Planodes virginicum (L.) Greene	BRASSICACEAE		native	
Plantago arenaria Waldst. & Kit.	PLANTAGINACEAE		naturalized	
Plantago aristata Michx.	PLANTAGINACEAE		naturalized	
Plantago coronopus L.	PLANTAGINACEAE		naturalized	
Plantago elongata Pursh	PLANTAGINACEAE		native	
Plantago erecta E. Morris	PLANTAGINACEAE		native	
Plantago eriopoda Torr.	PLANTAGINACEAE		native	
Plantago lanceolata L.	PLANTAGINACEAE	ENGLISH PLANTAIN	naturalized	
Plantago major L.	PLANTAGINACEAE	COMMON PLANTAIN	naturalized	
Plantago maritima L.	PLANTAGINACEAE		native	
Plantago ovata Forssk.	PLANTAGINACEAE		native	
Plantago ovata Forssk. var. fastigiata (Morris) S. C. Meyers & A. Liston	PLANTAGINACEAE		native	
Plantago ovata Forssk. var. insularis (Eastw.) S. C. Meyers & A. Liston	PLANTAGINACEAE		native	
Plantago patagonica Jacq.	PLANTAGINACEAE		native	
Plantago pusilla Nutt.	PLANTAGINACEAE		naturalized	
Plantago rhodosperma Decne.	PLANTAGINACEAE		native	
Plantago subnuda Pilg.	PLANTAGINACEAE		native	
Plantago truncata Cham. & Schltdl.	PLANTAGINACEAE		naturalized	
Plantago truncata Cham. & Schltdl. subsp. firma (Kunze ex Walp.) Pilg.	PLANTAGINACEAE		naturalized	
Plantago virginica L.	PLANTAGINACEAE		naturalized	
Platanthera dilatata (Pursh) Lindl. ex Beck var. leucostachys (Lindl.) Luer	ORCHIDACEAE	WHITE-FLOWERED BOG-ORCHID	native	
Platanthera dilatata (Pursh) Lindl. ex L. C. Beck	ORCHIDACEAE		native	
Platanthera sparsiflora (S. Watson) Schltr.	ORCHIDACEAE	SPARSE-FLOWERED BOG-ORCHID	native	
Platanthera stricta Lindl.	ORCHIDACEAE	SLENDER BOG-ORCHID	native	
Platanthera tescamnis Sheviak & W. F. Jenn.	ORCHIDACEAE		native	
Platanthera yosemitensis Colwell, Sheviak, & P.E. Moore	ORCHIDACEAE	YOSEMITE BOG-ORCHID	native	
Platanus racemosa Nutt.	PLATANACEAE	WESTERN SYCAMORE	native	
Platystemon californicus Benth.	PAPAVERACEAE	CREAM CUPS	native	
Plecostachys serpyllifolia (P.J. Bergius) Hilliard & B.L. Burtt	ASTERACEAE	PETITE-LICORICE	naturalized	
Plectritis ciliosa (Greene) Jeps.	VALERIANACEAE		native	
Plectritis congesta (Lindl.) A. DC. subsp. brachystemon (Fisch. & C. A. Mey.) Morey	VALERIANACEAE		native	
Plectritis congesta (Lindl.) A. DC. subsp. congesta	VALERIANACEAE	SEA BLUSH	native	
Plectritis congesta (Lindl.) DC.	VALERIANACEAE		native	
Plectritis macrocera Torr. & A. Gray	VALERIANACEAE		native	
Pleiacanthus spinosus (Nutt.) Rydb.	ASTERACEAE	THORNY SKELETONWEED	native	
Pleuricospora fimbriolata A. Gray	ERICACEAE		native	
Pleurocoronis pluriseta (A. Gray) R. M. King & H. Rob.	ASTERACEAE		native	
Pleuropogon californicus (Nees) Benth. ex Vasey	POACEAE		native	
Pleuropogon californicus (Nees) Benth. ex Vasey var. californicus	POACEAE		native	
Pleuropogon californicus (Nees) Benth. ex Vasey var. davyi (L. D. Benson) But	POACEAE	DAVY'S SEMAPHORE GRASS	native	
Pleuropogon hooverianus (L. D. Benson) J. T. Howell	POACEAE	NORTH COAST SEMAPHORE GRASS	native	
Pleuropogon refractus (A. Gray) Benth. ex Vasey	POACEAE	NODDING SEMAPHORE GRASS	native	
Pluchea odorata (L.) Cass.	ASTERACEAE		native	
Pluchea odorata (L.) Cass. var. odorata	ASTERACEAE	SALTMARSH-FLEABANE	native	
Pluchea sericea (Nutt.) Coville	ASTERACEAE	ARROW-WEED	native	
Poa abbreviata R. Br.	POACEAE	DWARF BLUE GRASS	native	
Poa abbreviata R. Br. subsp. marshii Soreng	POACEAE	MARSH'S BLUE GRASS	native	
Poa abbreviata R. Br. subsp. pattersonii (Vasey) Á. Löve, D. Löve & B. M. Kapoor	POACEAE	PATTERSON'S BLUE GRASS	native	
Poa annua L.	POACEAE	ANNUAL BLUE GRASS	naturalized	
Poa atropurpurea Scribn.	POACEAE	SAN BERNARDINO BLUE GRASS	native	
Poa bigelovii Vasey & Scribn.	POACEAE		native	
Poa bolanderi Vasey	POACEAE		native	
Poa bulbosa L.	POACEAE		naturalized	
Poa bulbosa L. subsp. bulbosa	POACEAE		naturalized	
Poa bulbosa L. subsp. vivipara (Koeler) Arcang.	POACEAE		naturalized	
Poa compressa L.	POACEAE	CANADIAN BLUE GRASS	naturalized	
Poa confinis Vasey	POACEAE	BEACH BLUE GRASS	native	
Poa cusickii Vasey	POACEAE		native	
Poa cusickii Vasey subsp. cusickii	POACEAE		native	
Poa cusickii Vasey subsp. epilis (Scribn.) W. A. Weber	POACEAE	SKYLINE BLUE GRASS	native	
Poa cusickii Vasey subsp. pallida Soreng	POACEAE		native	
Poa cusickii Vasey subsp. purpurascens (Vasey) Soreng	POACEAE		native	
Poa diaboli Soreng & D. J. Keil	POACEAE	DIABLO CANYON BLUE GRASS	native	
Poa douglasii Nees	POACEAE	SAND DUNE BLUE GRASS	native	
Poa fendleriana (Steud.) Vasey	POACEAE		native	
Poa fendleriana (Steud.) Vasey subsp. fendleriana	POACEAE	MUTTON GRASS	native	
Poa fendleriana (Steud.) Vasey subsp. longiligula (Scribn. & T. A. Williams) Soreng	POACEAE	LONG-TONGUE MUTTON GRASS	native	
Poa glauca Vahl	POACEAE		native	
Poa glauca Vahl subsp. rupicola (Nash ex Rydb.) W. A. Weber	POACEAE	TIMBERLINE BLUE GRASS	native	
Poa howellii Vasey & Scribn.	POACEAE		native	
Poa infirma Kunth	POACEAE	WEAK BLUE GRASS	naturalized	
Poa keckii Soreng	POACEAE		native	
Poa kelloggii Vasey	POACEAE	KELLOGG'S BLUE GRASS	native	
Poa leptocoma Trin.	POACEAE		native	
Poa leptocoma Trin. subsp. leptocoma	POACEAE	BOG BLUE GRASS	native	
Poa lettermanii Vasey	POACEAE	LETTERMAN'S BLUE GRASS	native	
Poa macrantha Vasey	POACEAE	SEASHORE BLUE GRASS	native	
Poa napensis Beetle	POACEAE	NAPA BLUE GRASS	native	
Poa nemoralis L.	POACEAE	WOOD BLUE GRASS	naturalized	
Poa palustris L.	POACEAE	FOWL BLUE GRASS	naturalized	
Poa piperi Hitchc.	POACEAE	PIPER'S BLUE GRASS	native	
Poa pratensis L.	POACEAE		naturalized	
Poa pratensis L. subsp. pratensis	POACEAE	KENTUCKY BLUE GRASS	naturalized	
Poa pringlei Scribn.	POACEAE		native	
Poa rhizomata Hitchc.	POACEAE	TIMBER BLUE GRASS	native	
Poa secunda J. Presl	POACEAE	NEVADA BLUE GRASS	native	
Poa secunda J. Presl subsp. juncifolia (Scribn.) Soreng	POACEAE		native	
Poa secunda J. Presl subsp. secunda	POACEAE	ONE-SIDED BLUE GRASS	native	
Poa sierrae J. T. Howell	POACEAE	SIERRA BLUE GRASS	native	
Poa stebbinsii Soreng	POACEAE		native	
Poa tenerrima Scribn.	POACEAE	DELICATE BLUE GRASS	native	
Poa trivialis L.	POACEAE	ROUGH BLUE GRASS	naturalized	
Poa unilateralis Scribn. ex Vasey	POACEAE		native	
Poa unilateralis Scribn. ex Vasey subsp. unilateralis	POACEAE	SAN FRANCISCO BLUE GRASS	native	
Poa wheeleri Vasey	POACEAE		native	
Podistera nevadensis (A. Gray) S. Watson	APIACEAE	SIERRA PODISTERA	native	
Pogogyne abramsii J. T. Howell	LAMIACEAE	SAN DIEGO MESA MINT	native	
Pogogyne clareana J. T. Howell	LAMIACEAE	SANTA LUCIA MINT	native	
Pogogyne douglasii Benth.	LAMIACEAE	DOUGLAS' BEARDSTYLE	native	
Pogogyne floribunda Jokerst	LAMIACEAE	PROFUSE-FLOWERED POGOGYNE	native	
Pogogyne nudiuscula A. Gray	LAMIACEAE	OTAY MESA MINT	native	
Pogogyne serpylloides (Torr.) A. Gray	LAMIACEAE	THYMELEAF BEARDSTYLE	native	
Pogogyne zizyphoroides Benth.	LAMIACEAE	SACRAMENTO BEARDSTYLE	native	
Polanisia dodecandra (L.) DC.	CLEOMACEAE		native	
Polanisia dodecandra (L.) DC. subsp. trachysperma (Torr. & A. Gray) H. H. Iltis	CLEOMACEAE	WESTERN CLAMMYWEED	native	
Polemonium californicum Eastw.	POLEMONIACEAE		native	
Polemonium carneum A. Gray	POLEMONIACEAE	OREGON POLEMONIUM	native	
Polemonium chartaceum H. Mason	POLEMONIACEAE	MASON'S SKY PILOT	native	
Polemonium eximium Greene	POLEMONIACEAE		native	
Polemonium micranthum Benth.	POLEMONIACEAE		native	
Polemonium occidentale Greene	POLEMONIACEAE		native	
Polemonium occidentale Greene subsp. occidentale	POLEMONIACEAE		native	
Polemonium pulcherrimum Hook.	POLEMONIACEAE		native	
Polemonium pulcherrimum Hook. var. pilosum (Greenm.) Brand	POLEMONIACEAE		native	
Polemonium pulcherrimum Hook. var. pulcherrimum	POLEMONIACEAE		native	
Poliomintha incana (Torr.) A. Gray	LAMIACEAE	FROSTED MINT	native	
Polycarpon depressum Nutt.	CARYOPHYLLACEAE		native	
Polycarpon tetraphyllum (L.) L.	CARYOPHYLLACEAE		naturalized	
Polycarpon tetraphyllum (L.) L. var. tetraphyllum	CARYOPHYLLACEAE	FOUR-LEAVED ALLSEED	naturalized	
Polyctenium fremontii (S. Watson) Greene	BRASSICACEAE		native	
Polygala acanthoclada A. Gray	POLYGALACEAE	THORNY MILKWORT	native	
Polygala californica Nutt.	POLYGALACEAE	CALIFORNIA MILKWORT	native	
Polygala cornuta Kellogg	POLYGALACEAE		native	
Polygala cornuta Kellogg var. cornuta	POLYGALACEAE	SIERRA MILKWORT	native	
Polygala cornuta Kellogg var. fishiae (Parry) Jeps.	POLYGALACEAE	FISH'S MILKWORT	native	
Polygala heterorhyncha (Barneby) T. Wendt	POLYGALACEAE	NOTCH-BEAKED MILKWORT	native	
Polygala intermontana T. Wendt	POLYGALACEAE	INTERMOUNTAIN MILKWORT	native	
Polygala subspinosa S. Watson	POLYGALACEAE	SPINY MILKWORT	native	
Polygonum argyrocoleon Kunze	POLYGONACEAE	PERSIAN KNOTWEED	naturalized	
Polygonum austiniae Greene	POLYGONACEAE	MRS. AUSTIN'S KNOTWEED	native	
Polygonum aviculare L.	POLYGONACEAE	KNOTGRASS	naturalized	
Polygonum aviculare L. subsp. aviculare	POLYGONACEAE		naturalized	
Polygonum aviculare L. subsp. depressum (Meisn.) Arcang.	POLYGONACEAE		naturalized	
Polygonum bidwelliae S. Watson	POLYGONACEAE	BIDWELL'S KNOTWEED	native	
Polygonum bolanderi W. H. Brewer	POLYGONACEAE	BOLANDER'S KNOTWEED	native	
Polygonum californicum Meisn.	POLYGONACEAE		native	
Polygonum douglasii Greene	POLYGONACEAE	DOUGLAS' KNOTWEED	native	
Polygonum fowleri B. L. Rob.	POLYGONACEAE		native	
Polygonum fowleri B. L. Rob. subsp. fowleri	POLYGONACEAE		native	
Polygonum hickmanii H. R. Hinds & Rand. Morgan	POLYGONACEAE	SCOTTS VALLEY POLYGONUM	native	
Polygonum majus (Meisn.) Piper	POLYGONACEAE	WIRY KNOTWEED	native	
Polygonum marinense T. R. Mert. & P. H. Raven	POLYGONACEAE	MARIN KNOTWEED	native	
Polygonum minimum S. Watson	POLYGONACEAE		native	
Polygonum paronychia Cham. & Schltdl.	POLYGONACEAE		native	
Polygonum parryi Greene	POLYGONACEAE	PRICKLY KNOTWEED	native	
Polygonum polygaloides Meisn.	POLYGONACEAE	POLYGALA KNOTWEED	native	
Polygonum polygaloides Meisn. subsp. confertiflorum (Nutt. ex Piper) J. C. Hickman	POLYGONACEAE		native	
Polygonum polygaloides Meisn. subsp. esotericum (L. C. Wheeler) J. C. Hickman	POLYGONACEAE	MODOC COUNTY KNOTWEED	native	
Polygonum polygaloides Meisn. subsp. kelloggii (Greene) J. C. Hickman	POLYGONACEAE		native	
Polygonum ramosissimum Michx.	POLYGONACEAE	BUSHY KNOTWEED	native	
Polygonum ramosissimum Michx. subsp. prolificum (Small) Costea & Tardif	POLYGONACEAE		naturalized	
Polygonum ramosissimum Michx. subsp. ramosissimum	POLYGONACEAE		native	
Polygonum sawatchense Small	POLYGONACEAE		native	
Polygonum sawatchense Small subsp. oblivium Costea & Tardif	POLYGONACEAE		native	
Polygonum sawatchense Small subsp. sawatchense	POLYGONACEAE		native	
Polygonum shastense W. H. Brewer	POLYGONACEAE		native	
Polygonum spergulariiforme Meisn. ex Small	POLYGONACEAE		native	
Polypodium californicum Kaulf.	POLYPODIACEAE	CALIFORNIA POLYPODY	native	
Polypodium calirhiza S. A. Whitmore & A. R. Sm.	POLYPODIACEAE		native	
Polypodium glycyrrhiza D. C. Eaton	POLYPODIACEAE	LICORICE FERN	native	
Polypodium hesperium Maxon	POLYPODIACEAE	WESTERN POLYPODY	native	
Polypodium scouleri Hook. & Grev.	POLYPODIACEAE	LEATHER-LEAF FERN	native	
Polypogon australis Brongn.	POACEAE	CHILEAN BEARD GRASS	naturalized	
Polypogon imberbis (Phil.) Johow	POACEAE		naturalized	
Polypogon interruptus Kunth	POACEAE	DITCH BEARD GRASS	naturalized	
Polypogon maritimus Willd.	POACEAE	MEDITERRANEAN BEARD GRASS	naturalized	
Polypogon monspeliensis (L.) Desf.	POACEAE	RABBITFOOT GRASS	naturalized	
Polypogon viridis (Gouan) Breistr.	POACEAE	WATER BEARD GRASS	naturalized	
Polystichum californicum (D. C. Eaton) Diels	DRYOPTERIDACEAE		native	
Polystichum dudleyi Maxon	DRYOPTERIDACEAE		native	
Polystichum imbricans (D. C. Eaton) D.H. Wagner	DRYOPTERIDACEAE		native	
Polystichum imbricans (D. C. Eaton) D.H. Wagner subsp. curtum (Ewan) D.H. Wagner	DRYOPTERIDACEAE		native	
Polystichum imbricans (D. C. Eaton) D.H. Wagner subsp. imbricans	DRYOPTERIDACEAE		native	
Polystichum kruckebergii W. H. Wagner	DRYOPTERIDACEAE	KRUCKEBERG'S SWORD FERN	native	
Polystichum lemmonii Underw.	DRYOPTERIDACEAE		native	
Polystichum lonchitis (L.) Roth	DRYOPTERIDACEAE	HOLLY FERN	native	
Polystichum munitum (Kaulf.) C. Presl	DRYOPTERIDACEAE	WESTERN SWORD FERN	native	
Polystichum scopulinum (D. C. Eaton) Maxon	DRYOPTERIDACEAE		native	
Populus alba L.	SALICACEAE	WHITE POPLAR	naturalized	
Populus angustifolia E. James	SALICACEAE	NARROW-LEAVED COTTONWOOD	native	
Populus fremontii S. Watson	SALICACEAE		native	
Populus fremontii S. Watson subsp. fremontii	SALICACEAE	FREMONT COTTONWOOD	native	
Populus nigra L. var. italica Du Roi	SALICACEAE		naturalized	acceptance uncertain
Populus nigra L. var. nigra	SALICACEAE		naturalized	acceptance uncertain
Populus tremuloides Michx.	SALICACEAE	QUAKING ASPEN	native	
Populus trichocarpa Torr. & A. Gray ex Hook.	SALICACEAE	BLACK COTTONWOOD	native	
Porophyllum gracile Benth.	ASTERACEAE	SLENDER PORELEAF	native	
Porterella carnosula (Hook. & Arn.) Torr.	CAMPANULACEAE		native	
Portulaca halimoides L.	PORTULACACEAE	DESERT PORTULACA	native	
Portulaca oleracea L.	PORTULACACEAE	PURSLANE	naturalized	
Potamogeton alpinus Balb.	POTAMOGETONACEAE		native	
Potamogeton amplifolius Tuck.	POTAMOGETONACEAE	BROAD-LEAVED PONDWEED	native	
Potamogeton berchtoldii Fieber	POTAMOGETONACEAE		native	
Potamogeton crispus L.	POTAMOGETONACEAE	CRISP-LEAVED PONDWEED	naturalized	
Potamogeton diversifolius Raf.	POTAMOGETONACEAE	DIVERSE-LEAVED PONDWEED	native	
Potamogeton epihydrus Raf.	POTAMOGETONACEAE	NUTTALL'S RIBBON-LEAVED PONDWEED	native	
Potamogeton foliosus Raf.	POTAMOGETONACEAE	LEAFY PONDWEED	native	
Potamogeton foliosus Raf. subsp. fibrillosus (Fernald) R. R. Haynes & Hellq.	POTAMOGETONACEAE	FIBROUS PONDWEED	native	
Potamogeton foliosus Raf. subsp. foliosus	POTAMOGETONACEAE		native	
Potamogeton gramineus L.	POTAMOGETONACEAE	GRASS-LEAVED PONDWEED	native	
Potamogeton illinoensis Morong	POTAMOGETONACEAE	SHINING PONDWEED	native	
Potamogeton natans L.	POTAMOGETONACEAE	FLOATING-LEAVED PONDWEED	native	
Potamogeton nodosus Poir.	POTAMOGETONACEAE	LONG-LEAVED PONDWEED	native	
Potamogeton praelongus Wulfen	POTAMOGETONACEAE	WHITE-STEMMED PONDWEED	native	
Potamogeton pusillus L.	POTAMOGETONACEAE	SMALL PONDWEED	native	
Potamogeton richardsonii (A. Benn.) Rydb.	POTAMOGETONACEAE	RICHARDSON'S PONDWEED	native	
Potamogeton robbinsii Oakes	POTAMOGETONACEAE	ROBBINS' PONDWEED	native	
Potamogeton zosteriformis Fernald	POTAMOGETONACEAE	EEL-GRASS PONDWEED	native	
Potentilla anglica Laichard.	ROSACEAE	ENGLISH CINQUEFOIL	naturalized	
Potentilla anserina L.	ROSACEAE		native	
Potentilla anserina L. subsp. anserina	ROSACEAE	COMMON SILVERWEED	native	
Potentilla anserina L. subsp. pacifica (Howell) Rousi	ROSACEAE	PACIFIC SILVERWEED	native	
Potentilla basaltica Tiehm & Ertter	ROSACEAE	BLACK ROCK POTENTILLA	native	
Potentilla biennis Greene	ROSACEAE	GREENE'S CINQUEFOIL	native	
Potentilla breweri S. Watson	ROSACEAE	BREWER'S CINQUEFOIL	native	
Potentilla bruceae Rydb.	ROSACEAE	BRUCE'S CINQUEFOIL	native	
Potentilla concinna Richardson	ROSACEAE		native	
Potentilla concinna Richardson var. proxima (Rydb.) S. L. Welsh	ROSACEAE	EARLY CINQUEFOIL	native	
Potentilla cristae Ferlatte & Strother	ROSACEAE	CRESTED POTENTILLA	native	
Potentilla drummondii Lehm.	ROSACEAE	DRUMMOND'S CINQUEFOIL	native	
Potentilla flabellifolia Hook. ex Torr. & A. Gray	ROSACEAE	FANLEAF CINQUEFOIL	native	
Potentilla glaucophylla Lehm.	ROSACEAE		native	
Potentilla glaucophylla Lehm. var. glaucophylla	ROSACEAE	BLUELEAF CINQUEFOIL	native	
Potentilla gracilis Hook.	ROSACEAE	SLENDER CINQUEFOIL	native	
Potentilla gracilis Hook. var. elmeri (Rydb.) Jeps.	ROSACEAE		native	
Potentilla gracilis Hook. var. fastigiata (Nutt.) S. Watson	ROSACEAE		native	
Potentilla gracilis Hook. var. flabelliformis (Lehm.) Torr. & A. Gray	ROSACEAE		native	
Potentilla gracilis Hook. var. gracilis	ROSACEAE		native	
Potentilla grayi S. Watson	ROSACEAE	GRAY'S CINQUEFOIL	native	
Potentilla hickmanii Eastw.	ROSACEAE	HICKMAN'S CINQUEFOIL	native	
Potentilla jepsonii Ertter	ROSACEAE	JEPSON'S CINQUEFOIL	native	
Potentilla millefolia Rydb.	ROSACEAE	FEATHER CINQUEFOIL	native	
Potentilla morefieldii Ertter	ROSACEAE	MOREFIELD'S CINQUEFOIL	native	
Potentilla newberryi A. Gray	ROSACEAE	NEWBERRY'S CINQUEFOIL	native	
Potentilla norvegica L.	ROSACEAE	ROUGH CINQUEFOIL	naturalized	
Potentilla pensylvanica L.	ROSACEAE	PRAIRIE CINQUEFOIL	native	
Potentilla pseudosericea Rydb.	ROSACEAE	MONO CINQUEFOIL	native	
Potentilla pulcherrima Lehm.	ROSACEAE	BEAUTIFUL CINQUEFOIL	native	
Potentilla recta L.	ROSACEAE	SULPHUR CINQUEFOIL	naturalized	
Potentilla rimicola (Munz & I. M. Johnst.) Ertter	ROSACEAE	CLIFF CINQUEFOIL	native	
Potentilla rivalis Nutt.	ROSACEAE	RIVER CINQUEFOIL	native	
Potentilla wheeleri S. Watson	ROSACEAE	WHEELER'S CINQUEFOIL	native	
Poteridium annuum (Nutt.) Spach	ROSACEAE	WESTERN BURNET	native	
Poterium sanguisorba L.	ROSACEAE	GARDEN BURNET	naturalized	
Prenanthella exigua (A. Gray) Rydb.	ASTERACEAE	BRIGHTWHITE	native	
Primula suffrutescens A. Gray	PRIMULACEAE	SIERRA PRIMROSE	native	
Proboscidea althaeifolia (Benth.) Decne.	MARTYNIACEAE	DESERT UNICORN-PLANT	native	
Proboscidea louisianica (Mill.) Thell.	MARTYNIACEAE		naturalized	
Proboscidea louisianica (Mill.) Thell. subsp. louisianica	MARTYNIACEAE		naturalized	
Proboscidea lutea (Lindl.) Stapf	MARTYNIACEAE		naturalized	
Prosartes hookeri Torr.	LILIACEAE		native	
Prosartes parvifolia S. Watson	LILIACEAE	SISKIYOU BELLS	native	
Prosartes smithii (Hook.) Utech, Shinwari, & Kawano	LILIACEAE		native	
Prosopis glandulosa Torr.	FABACEAE		native	
Prosopis glandulosa Torr. var. torreyana (L. D. Benson) M. C. Johnst.	FABACEAE	HONEY MESQUITE	native	
Prosopis pubescens Benth.	FABACEAE	TORNILLO	native	
Prosopis velutina Wooton	FABACEAE		naturalized	
Prunella vulgaris L.	LAMIACEAE		native	
Prunella vulgaris L. var. lanceolata (W. P. C. Barton) Fernald	LAMIACEAE		native	
Prunella vulgaris L. var. vulgaris	LAMIACEAE		naturalized	
Prunus andersonii A. Gray	ROSACEAE	DESERT PEACH	native	
Prunus cerasifera Ehrh.	ROSACEAE	CHERRY PLUM	naturalized	
Prunus dulcis (Mill.) D. A. Webb	ROSACEAE	ALMOND	naturalized	
Prunus emarginata (Douglas) Eaton	ROSACEAE	BITTER CHERRY	native	
Prunus eremophila Prigge	ROSACEAE	MOJAVE DESERT PLUM	native	
Prunus fasciculata (Torr.) A. Gray	ROSACEAE	DESERT ALMOND	native	
Prunus fasciculata (Torr.) A. Gray var. fasciculata	ROSACEAE		native	
Prunus fasciculata (Torr.) A. Gray var. punctata Jeps.	ROSACEAE	SAND ALMOND	native	
Prunus fremontii S. Watson	ROSACEAE	DESERT APRICOT	native	
Prunus ilicifolia (Nutt. ex Hook. & Arn.) D. Dietr.	ROSACEAE		native	
Prunus ilicifolia (Nutt. ex Hook. & Arn.) D. Dietr. subsp. ilicifolia	ROSACEAE	HOLLY-LEAFED CHERRY	native	
Prunus ilicifolia (Nutt. ex Hook. & Arn.) D. Dietr. subsp. lyonii (Eastw.) P. H. Raven	ROSACEAE	CATALINA CHERRY	native	
Prunus persica Batsch	ROSACEAE	PEACH	naturalized	
Prunus subcordata Benth.	ROSACEAE	SIERRA PLUM	native	
Prunus virginiana L.	ROSACEAE		native	
Prunus virginiana L. var. demissa (Nutt.) Torr.	ROSACEAE	WESTERN CHOKE CHERRY	native	
Psathyrotes annua (Nutt.) A. Gray	ASTERACEAE		native	
Psathyrotes ramosissima (Torr.) A. Gray	ASTERACEAE	TURTLEBACK	native	
Pseudobahia bahiifolia (Benth.) Rydb.	ASTERACEAE	HARTWEG'S GOLDEN SUNBURST	native	
Pseudobahia heermannii (Durand) Rydb.	ASTERACEAE	BRITTLESTEM	native	
Pseudobahia peirsonii Munz	ASTERACEAE	SAN JOAQUIN ADOBE SUNBURST	native	
Pseudognaphalium beneolens (Davidson) Anderb.	ASTERACEAE		native	
Pseudognaphalium biolettii Anderb.	ASTERACEAE		native	
Pseudognaphalium californicum (DC.) Anderb.	ASTERACEAE		native	
Pseudognaphalium canescens (DC.) Anderb.	ASTERACEAE		native	
Pseudognaphalium leucocephalum (A. Gray) Anderb.	ASTERACEAE	WHITE RABBIT-TOBACCO	native	
Pseudognaphalium luteoalbum (L.) Hilliard & B. L. Burtt	ASTERACEAE		naturalized	
Pseudognaphalium macounii (Greene) Kartesz	ASTERACEAE	MACOUN'S EVERLASTING	native	
Pseudognaphalium microcephalum (Nutt.) Anderb.	ASTERACEAE		native	
Pseudognaphalium ramosissimum (Nutt.) Anderb.	ASTERACEAE		native	
Pseudognaphalium roseum (Kunth) Anderb.	ASTERACEAE		native	
Pseudognaphalium stramineum (Kunth) Anderb.	ASTERACEAE		native	
Pseudognaphalium thermale (E. E. Nelson) G. L. Nesom	ASTERACEAE		native	
Pseudorontium cyathiferum (Benth.) Rothm.	PLANTAGINACEAE	DEEP CANYON SNAPDRAGON	native	
Pseudostellaria jamesiana (Torr.) W. A. Weber & R. L. Hartm.	CARYOPHYLLACEAE	TUBER STARWORT	native	
Pseudostellaria sierrae Rabeler & R. L. Hartm.	CARYOPHYLLACEAE	SIERRA STARWORT	native	
Pseudotrillium rivale (S. Watson) S. B Farmer	MELANTHIACEAE	BROOK WAKEROBIN	native	
Pseudotsuga macrocarpa (Vasey) Mayr	PINACEAE	BIGCONE SPRUCE	native	
Pseudotsuga menziesii (Mirb.) Franco	PINACEAE		native	
Pseudotsuga menziesii (Mirb.) Franco var. menziesii	PINACEAE	DOUGLAS-FIR	native	
Psilocarphus brevissimus Nutt.	ASTERACEAE		native	
Psilocarphus brevissimus Nutt. var. brevissimus	ASTERACEAE	DWARF WOOLLYHEADS	native	
Psilocarphus brevissimus Nutt. var. multiflorus Cronquist	ASTERACEAE	DELTA WOOLLY-MARBLES	native	
Psilocarphus chilensis A. Gray	ASTERACEAE	ROUND WOOLLY-MARBLES	native	
Psilocarphus elatior (A. Gray) A. Gray	ASTERACEAE	TALL WOOLLY-MARBLES	native	
Psilocarphus oregonus Nutt.	ASTERACEAE	OREGON WOOLLYHEADS	native	
Psilocarphus tenellus Nutt.	ASTERACEAE	SLENDER WOOLLY-MARBLES	native	
Psilostrophe cooperi (A. Gray) Greene	ASTERACEAE		native	
Psorothamnus arborescens (A. Gray) Barneby	FABACEAE	MOJAVE INDIGO-BUSH	native	
Psorothamnus arborescens (A. Gray) Barneby var. arborescens	FABACEAE		native	
Psorothamnus arborescens (A. Gray) Barneby var. minutifolius (Parish) Barneby	FABACEAE		native	
Psorothamnus arborescens (A. Gray) Barneby var. simplicifolius (Parish) Barneby	FABACEAE		native	
Psorothamnus emoryi (A. Gray) Rydb.	FABACEAE		native	
Psorothamnus fremontii (Torr. ex A. Gray) Barneby	FABACEAE	FREMONT'S DALEA	native	
Psorothamnus fremontii (Torr. ex A. Gray) Barneby var. attenuatus Barneby	FABACEAE	NARROW-LEAVED PSOROTHAMNUS	native	
Psorothamnus fremontii (Torr. ex A. Gray) Barneby var. fremontii	FABACEAE		native	
Psorothamnus polydenius (Torr.) Rydb.	FABACEAE		native	
Psorothamnus schottii (Torr.) Barneby	FABACEAE	INDIGO-BUSH	native	
Psorothamnus spinosus (A. Gray) Barneby	FABACEAE	SMOKE TREE	native	
Ptelea crenulata Greene	RUTACEAE		native	
Pteridium aquilinum (L.) Kuhn	DENNSTAEDTIACEAE		native	
Pteridium aquilinum (L.) Kuhn var. pubescens Underw.	DENNSTAEDTIACEAE		native	
Pteris cretica L.	PTERIDACEAE	CRETAN BRAKE	naturalized	
Pteris vittata L.	PTERIDACEAE	LADDER BRAKE	naturalized	
Pterospora andromedea Nutt.	ERICACEAE		native	
Pterostegia drymarioides Fisch. & C. A. Mey.	POLYGONACEAE		native	
Puccinellia distans (Jacq.) Parl.	POACEAE	EUROPEAN ALKALI GRASS	naturalized	
Puccinellia howellii J. I Davis	POACEAE	HOWELL'S ALKALI GRASS	native	
Puccinellia lemmonii (Vasey) Scribn.	POACEAE	LEMMON'S ALKALI GRASS	native	
Puccinellia nutkaensis (J. Presl) Fernald & Weath.	POACEAE	ALASKA ALKALI GRASS	native	
Puccinellia nuttalliana (Schult.) Hitchc.	POACEAE	NUTTALL'S ALKALI GRASS	native	
Puccinellia parishii Hitchc.	POACEAE	PARISH'S ALKALI GRASS	native	
Puccinellia pumila (Vasey) Hitchc.	POACEAE	DWARF ALKALI GRASS	native	
Puccinellia simplex Scribn.	POACEAE		native	
Pulicaria paludosa Link	ASTERACEAE		naturalized	
Punica granatum L.	LYTHRACEAE		naturalized	
Purshia stansburyana (Torr.) Henr.	ROSACEAE	CLIFFROSE	native	
Purshia tridentata (Pursh) DC.	ROSACEAE	BITTERBRUSH	native	
Purshia tridentata (Pursh) DC. var. glandulosa (Curran) M. E. Jones	ROSACEAE		native	
Purshia tridentata (Pursh) DC. var. tridentata	ROSACEAE		native	
Pycnanthemum californicum Torr. ex Durand	LAMIACEAE		native	
Pyracantha angustifolia (Franch.) C. K. Schneid.	ROSACEAE	WOOLLY FIRETHORN	naturalized	
Pyracantha fortuneana (Maxim.) H. L. Li.	ROSACEAE	CHINESE FIRETHORN	naturalized	
Pyracantha koidzumii (Hayata) Rehder	ROSACEAE	TAIWAN FIRETHORN	naturalized	
Pyrola asarifolia Michx.	ERICACEAE		native	
Pyrola asarifolia Michx. subsp. asarifolia	ERICACEAE	BOG WINTERGREEN	native	
Pyrola asarifolia Michx. subsp. bracteata (Hook.) Haber	ERICACEAE	LONG-BRACTED WINTERGREEN	native	
Pyrola chlorantha Sw.	ERICACEAE	GREEN-FLOWERED WINTERGREEN	native	
Pyrola minor L.	ERICACEAE	LESSER WINTERGREEN	native	
Pyrola picta Sm.	ERICACEAE	WHITE-VEINED WINTERGREEN	native	
Pyrrocoma apargioides (A. Gray) Greene	ASTERACEAE	ALPINE FLAMES	native	
Pyrrocoma carthamoides Hook.	ASTERACEAE		native	
Pyrrocoma carthamoides Hook. var. cusickii (A. Gray) Kartesz & Gandhi	ASTERACEAE	LARGE-FLOWERED GOLDENWEED	native	
Pyrrocoma hirta (A. Gray) Greene	ASTERACEAE	TACKY GOLDENWEED	native	
Pyrrocoma hirta (A. Gray) Greene var. hirta	ASTERACEAE		native	
Pyrrocoma hirta (A. Gray) Greene var. lanulosa (Greene) G. K. Br. & D. J. Keil	ASTERACEAE		native	
Pyrrocoma lanceolata (Hook.) Greene	ASTERACEAE		native	
Pyrrocoma lanceolata (Hook.) Greene var. lanceolata	ASTERACEAE		native	
Pyrrocoma lanceolata (Hook.) Greene var. subviscosa (Greene) G. K. Br. & D. J. Keil	ASTERACEAE		native	
Pyrrocoma lucida (D. D. Keck) Kartesz & Gandhi	ASTERACEAE	STICKY PYRROCOMA	native	
Pyrrocoma racemosa (Nutt.) Torr. & A. Gray	ASTERACEAE	CLUSTERED GOLDENWEED	native	
Pyrrocoma racemosa (Nutt.) Torr. & A. Gray var. congesta (Greene) G. K. Br. & D. J. Keil	ASTERACEAE	DEL NORTE PYRROCOMA	native	
Pyrrocoma racemosa (Nutt.) Torr. & A. Gray var. paniculata (Nutt.) Kartesz & Gandhi	ASTERACEAE		native	
Pyrrocoma racemosa (Nutt.) Torr. & A. Gray var. pinetorum (D. D. Keck) Kartesz & Gandhi	ASTERACEAE	PINE PYRROCOMA	native	
Pyrrocoma racemosa (Nutt.) Torr. & A. Gray var. racemosa	ASTERACEAE		native	
Pyrrocoma racemosa (Nutt.) Torr. & A. Gray var. sessiliflora (Greene) G. K. Br. & D. J. Keil	ASTERACEAE		native	
Pyrrocoma uniflora (Hook.) Greene	ASTERACEAE	PLANTAIN GOLDENWEED	native	
Pyrrocoma uniflora (Hook.) Greene var. gossypina (Greene) Kartesz & Gandhi	ASTERACEAE	BEAR VALLEY PYRROCOMA	native	
Pyrrocoma uniflora (Hook.) Greene var. uniflora	ASTERACEAE		native	
Pyrus calleryana Dcne.	ROSACEAE		naturalized	acceptance uncertain
Pyrus communis L.	ROSACEAE	COMMON PEAR	naturalized	
Quercus agrifolia Née	FAGACEAE	ENCINA	native	
Quercus agrifolia Née var. agrifolia	FAGACEAE		native	
Quercus agrifolia Née var. oxyadenia (Torr.) J. T. Howell	FAGACEAE		native	
Quercus berberidifolia Liebm.	FAGACEAE	SCRUB OAK	native	
Quercus cedrosensis C. H. Mull.	FAGACEAE	CEDROS ISLAND OAK	native	
Quercus chrysolepis Liebm.	FAGACEAE	CANYON LIVE OAK	native	
Quercus cornelius-mulleri Nixon & K. P. Steele	FAGACEAE	MULLER'S OAK	native	
Quercus douglasii Hook. & Arn.	FAGACEAE	BLUE OAK	native	
Quercus dumosa Nutt.	FAGACEAE	NUTTALL'S SCRUB OAK	native	
Quercus durata Jeps.	FAGACEAE	LEATHER OAK	native	
Quercus durata Jeps. var. durata	FAGACEAE		native	
Quercus durata Jeps. var. gabrielensis Nixon & C. H. Mull.	FAGACEAE	SAN GABRIEL OAK	native	
Quercus engelmannii Greene	FAGACEAE	ENGELMANN OAK	native	
Quercus garryana Hook.	FAGACEAE	OREGON OAK	native	
Quercus garryana Hook. var. breweri (Engelm.) Jeps.	FAGACEAE		native	
Quercus garryana Hook. var. garryana	FAGACEAE		native	
Quercus garryana Hook. var. semota Jeps.	FAGACEAE		native	
Quercus ilex L.	FAGACEAE	HOLLY OAK	naturalized	
Quercus john-tuckeri Nixon & C. H. Mull.	FAGACEAE	TUCKER'S OAK	native	
Quercus kelloggii Newb.	FAGACEAE	CALIFORNIA BLACK OAK	native	
Quercus lobata Née	FAGACEAE	ROBLE	native	
Quercus pacifica Nixon & C. H. Mull.	FAGACEAE	ISLAND SCRUB OAK	native	
Quercus palmeri (Engelm.) Engelm.	FAGACEAE	PALMER'S OAK	native	
Quercus parvula Greene	FAGACEAE		native	
Quercus parvula Greene var. parvula	FAGACEAE	SANTA CRUZ ISLAND OAK	native	
Quercus parvula Greene var. shrevei (C. H. Mull.) Nixon	FAGACEAE	SHREVE OAK	native	
Quercus parvula Greene var. tamalpaisensis S. K. Langer	FAGACEAE	TAMALPAIS OAK	native	
Quercus sadleriana R. Br. ter	FAGACEAE	DEER OAK	native	
Quercus tomentella Engelm.	FAGACEAE	ISLAND OAK	native	
Quercus turbinella Greene	FAGACEAE	SHRUB LIVE OAK	native	
Quercus vacciniifolia Kellogg	FAGACEAE	HUCKLEBERRY OAK	native	
Quercus wislizeni A.DC.	FAGACEAE	INTERIOR LIVE OAK	native	
Quercus wislizeni A.DC. var. frutescens Engelm.	FAGACEAE		native	
Quercus wislizeni A.DC. var. wislizeni	FAGACEAE		native	
Rafinesquia californica Nutt.	ASTERACEAE	CALIFORNIA CHICORY	native	
Rafinesquia neomexicana A. Gray	ASTERACEAE	DESERT CHICORY	native	
Raillardella argentea (A. Gray) A. Gray	ASTERACEAE	SILKY RAILLARDELLA	native	
Raillardella pringlei Greene	ASTERACEAE	SHOWY RAILLARDELLA	native	
Raillardella scaposa (A. Gray) A. Gray	ASTERACEAE		native	
Ranunculus alismifolius Benth.	RANUNCULACEAE		native	
Ranunculus alismifolius Benth. var. alismellus A. Gray	RANUNCULACEAE		native	
Ranunculus alismifolius Benth. var. alismifolius	RANUNCULACEAE		native	
Ranunculus alismifolius Benth. var. hartwegii (Greene) Jeps.	RANUNCULACEAE		native	
Ranunculus alismifolius Benth. var. lemmonii (A. Gray) L. D. Benson	RANUNCULACEAE		native	
Ranunculus andersonii A. Gray	RANUNCULACEAE		native	
Ranunculus aquatilis L.	RANUNCULACEAE		native	
Ranunculus aquatilis L. var. aquatilis	RANUNCULACEAE		native	
Ranunculus aquatilis L. var. diffusus With.	RANUNCULACEAE		native	
Ranunculus arvensis L.	RANUNCULACEAE		naturalized	
Ranunculus bonariensis Poir.	RANUNCULACEAE		native	
Ranunculus bonariensis Poir. var. trisepalus (Gillies ex Hook. & Arn.) Lourteig	RANUNCULACEAE		native	
Ranunculus californicus Benth.	RANUNCULACEAE		native	
Ranunculus californicus Benth. var. californicus	RANUNCULACEAE		native	
Ranunculus californicus Benth. var. cuneatus Greene	RANUNCULACEAE		native	
Ranunculus canus Benth.	RANUNCULACEAE		native	
Ranunculus canus Benth. var. canus	RANUNCULACEAE		native	
Ranunculus canus Benth. var. ludovicianus (Greene) L. D. Benson	RANUNCULACEAE		native	
Ranunculus cymbalaria Pursh	RANUNCULACEAE		native	
Ranunculus eschscholtzii Schltdl.	RANUNCULACEAE		native	
Ranunculus eschscholtzii Schltdl. var. eschscholtzii	RANUNCULACEAE		native	
Ranunculus eschscholtzii Schltdl. var. oxynotus (A. Gray) Jeps.	RANUNCULACEAE		native	
Ranunculus eschscholtzii Schltdl. var. suksdorfii (A. Gray) L. D. Benson	RANUNCULACEAE		native	
Ranunculus flabellaris Raf.	RANUNCULACEAE		native	
Ranunculus flammula L.	RANUNCULACEAE		native	
Ranunculus flammula L. var. flammula	RANUNCULACEAE		native	
Ranunculus flammula L. var. ovalis (Bigelow) L. D. Benson	RANUNCULACEAE		native	
Ranunculus glaberrimus Hook.	RANUNCULACEAE		native	
Ranunculus glaberrimus Hook. var. ellipticus (Greene) Greene	RANUNCULACEAE		native	
Ranunculus glaberrimus Hook. var. glaberrimus	RANUNCULACEAE		native	
Ranunculus gormanii Greene	RANUNCULACEAE		native	
Ranunculus hebecarpus Hook. & Arn.	RANUNCULACEAE		native	
Ranunculus hydrocharoides A. Gray	RANUNCULACEAE	FROG'S-BIT BUTTERCUP	native	
Ranunculus hystriculus A. Gray	RANUNCULACEAE		native	
Ranunculus lobbii (Hiern) A. Gray	RANUNCULACEAE	LOBB'S AQUATIC BUTTERCUP	native	
Ranunculus macounii Britton	RANUNCULACEAE	MACOUN'S BUTTERCUP	native	
Ranunculus muricatus L.	RANUNCULACEAE		naturalized	
Ranunculus occidentalis Nutt.	RANUNCULACEAE		native	
Ranunculus occidentalis Nutt. var. dissectus L. F. Hend.	RANUNCULACEAE		native	
Ranunculus occidentalis Nutt. var. howellii Greene	RANUNCULACEAE		native	
Ranunculus occidentalis Nutt. var. occidentalis	RANUNCULACEAE		native	
Ranunculus occidentalis Nutt. var. ultramontanus Greene	RANUNCULACEAE		native	
Ranunculus orthorhynchus Hook.	RANUNCULACEAE		native	
Ranunculus orthorhynchus Hook. var. bloomeri (S. Watson) L. D. Benson	RANUNCULACEAE		native	
Ranunculus orthorhynchus Hook. var. orthorhynchus	RANUNCULACEAE		native	
Ranunculus orthorhynchus Hook. var. platyphyllus A. Gray	RANUNCULACEAE		native	
Ranunculus parviflorus L.	RANUNCULACEAE		naturalized	
Ranunculus populago Greene	RANUNCULACEAE		native	
Ranunculus pusillus Poir.	RANUNCULACEAE		native	
Ranunculus repens L.	RANUNCULACEAE		naturalized	
Ranunculus sardous Crantz	RANUNCULACEAE		naturalized	
Ranunculus sceleratus L.	RANUNCULACEAE		native	
Ranunculus sceleratus L. var. multifidus Nutt.	RANUNCULACEAE		native	
Ranunculus sceleratus L. var. sceleratus	RANUNCULACEAE		naturalized	
Ranunculus testiculatus Crantz	RANUNCULACEAE		naturalized	
Ranunculus uncinatus D. Don	RANUNCULACEAE		native	
Raphanus raphanistrum L.	BRASSICACEAE	JOINTED CHARLOCK	naturalized	
Raphanus sativus L.	BRASSICACEAE	RADISH	naturalized	
Rapistrum rugosum (L.) All.	BRASSICACEAE		naturalized	
Ratibida columnifera (Nutt.) Wooton & Standl.	ASTERACEAE		naturalized	
Reseda alba L.	RESEDACEAE	WHITE MIGNONETTE	naturalized	
Reseda lutea L.	RESEDACEAE	YELLOW MIGNONETTE	naturalized	
Reseda luteola L.	RESEDACEAE	DYER'S ROCKET	naturalized	
Rhagadiolus stellatus (L.) Gaertn.	ASTERACEAE		naturalized	
Rhamnus alnifolia L'Hér.	RHAMNACEAE	ALDER BUCKTHORN	native	
Rhamnus crocea Nutt.	RHAMNACEAE	SPINY REDBERRY	native	
Rhamnus ilicifolia Kellogg	RHAMNACEAE	HOLLYLEAF REDBERRY	native	
Rhamnus pilosa (Trel. ex Curran) Abrams	RHAMNACEAE		native	
Rhamnus pirifolia Greene	RHAMNACEAE	ISLAND REDBERRY	native	
Rhodiola integrifolia Raf.	CRASSULACEAE		native	
Rhodiola integrifolia Raf. subsp. integrifolia	CRASSULACEAE	WESTERN ROSEROOT	native	
Rhododendron columbianum (Piper) Harmaja	ERICACEAE	WESTERN LABRADOR TEA	native	
Rhododendron macrophyllum D. Don ex G. Don	ERICACEAE	CALIFORNIA RHODODENDRON	native	
Rhododendron occidentale (Torr. & A. Gray) A. Gray	ERICACEAE	CALIFORNIA AZALEA	native	
Rhus aromatica Aiton	ANACARDIACEAE	SKUNK BUSH	native	
Rhus integrifolia (Nutt.) Benth. & Hook. f. ex Rothr.	ANACARDIACEAE	LEMONADE BERRY	native	
Rhus ovata S. Watson	ANACARDIACEAE	SUGAR BUSH	native	
Rhynchospora alba (L.) Vahl	CYPERACEAE	WHITE BEAKED-RUSH	native	
Rhynchospora californica Gale	CYPERACEAE	CALIFORNIA BEAKED-RUSH	native	
Rhynchospora capitellata (Michx.) Vahl	CYPERACEAE	BROWNISH BEAKED-RUSH	native	
Rhynchospora globularis (Chapm.) Small	CYPERACEAE		native	
Ribes amarum McClatchie	GROSSULARIACEAE	BITTER GOOSEBERRY	native	
Ribes aureum Pursh	GROSSULARIACEAE	GOLDEN CURRANT	native	
Ribes aureum Pursh var. aureum	GROSSULARIACEAE		native	
Ribes aureum Pursh var. gracillimum (Coville & Britton) Jeps.	GROSSULARIACEAE		native	
Ribes binominatum A. Heller	GROSSULARIACEAE	TRAILING GOOSEBERRY	native	
Ribes bracteosum Douglas in Hook.	GROSSULARIACEAE	STINK CURRANT	native	
Ribes californicum Hook. & Arn.	GROSSULARIACEAE	HILLSIDE GOOSEBERRY	native	
Ribes californicum Hook. & Arn. var. californicum	GROSSULARIACEAE		native	
Ribes californicum Hook. & Arn. var. hesperium (McClatchie) Jeps.	GROSSULARIACEAE		native	
Ribes canthariforme Wiggins	GROSSULARIACEAE	MORENO CURRANT	native	
Ribes cereum Douglas	GROSSULARIACEAE	WAX CURRANT	native	
Ribes cereum Douglas var. cereum	GROSSULARIACEAE		native	
Ribes cereum Douglas var. inebrians (Lindl.) C. L. Hitchc.	GROSSULARIACEAE		native	
Ribes divaricatum Douglas	GROSSULARIACEAE		native	
Ribes divaricatum Douglas var. parishii (A. Heller) Jeps.	GROSSULARIACEAE	PARISH'S GOOSEBERRY	native	
Ribes divaricatum Douglas var. pubiflorum Koehne	GROSSULARIACEAE	STRAGGLE BUSH	native	
Ribes hudsonianum Richardson	GROSSULARIACEAE		native	
Ribes hudsonianum Richardson var. petiolare (Douglas) Jancz.	GROSSULARIACEAE	WESTERN BLACK CURRANT	native	
Ribes indecorum Eastw.	GROSSULARIACEAE	WHITE-FLOWERING CURRANT	native	
Ribes inerme Rydb.	GROSSULARIACEAE	WHITE-STEMMED GOOSEBERRY	native	
Ribes inerme Rydb. var. inerme	GROSSULARIACEAE		native	
Ribes inerme Rydb. var. klamathense (Coville) Jeps.	GROSSULARIACEAE		native	
Ribes lacustre (Pers.) Poir.	GROSSULARIACEAE	SWAMP CURRANT	native	
Ribes lasianthum Greene	GROSSULARIACEAE	WOOLLY-FLOWERED GOOSEBERRY	native	
Ribes laxiflorum Pursh	GROSSULARIACEAE	TRAILING BLACK CURRANT	native	
Ribes lobbii A. Gray	GROSSULARIACEAE	GUMMY GOOSEBERRY	native	
Ribes malvaceum Sm.	GROSSULARIACEAE	CHAPARRAL CURRANT	native	
Ribes malvaceum Sm. var. malvaceum	GROSSULARIACEAE		native	
Ribes malvaceum Sm. var. viridifolium Abrams	GROSSULARIACEAE		native	
Ribes marshallii Greene	GROSSULARIACEAE	MARSHALL'S GOOSEBERRY	native	
Ribes menziesii Pursh	GROSSULARIACEAE	CANYON GOOSEBERRY	native	
Ribes menziesii Pursh var. ixoderme Quick	GROSSULARIACEAE	AROMATIC CANYON GOOSEBERRY	native	
Ribes menziesii Pursh var. menziesii	GROSSULARIACEAE		native	
Ribes montigenum McClatchie	GROSSULARIACEAE	WESTERN PRICKLY GOOSEBERRY	native	
Ribes nevadense Kellogg	GROSSULARIACEAE	MOUNTAIN PINK CURRANT	native	
Ribes quercetorum Greene	GROSSULARIACEAE	OAKWOODS GOOSEBERRY	native	
Ribes roezlii Regel	GROSSULARIACEAE	SIERRAN GOOSEBERRY	native	
Ribes roezlii Regel var. amictum (Greene) Jeps.	GROSSULARIACEAE	HOARY GOOSEBERRY	native	
Ribes roezlii Regel var. cruentum (Greene) Rehder	GROSSULARIACEAE		native	
Ribes roezlii Regel var. roezlii	GROSSULARIACEAE		native	
Ribes sanguineum Pursh	GROSSULARIACEAE	RED-FLOWERING CURRANT	native	
Ribes sanguineum Pursh var. glutinosum (Benth.) Loudon	GROSSULARIACEAE		native	
Ribes sanguineum Pursh var. sanguineum	GROSSULARIACEAE		native	
Ribes sericeum Eastw.	GROSSULARIACEAE	SANTA LUCIA GOOSEBERRY	native	
Ribes speciosum Pursh	GROSSULARIACEAE	FUCHSIA-FLOWERED GOOSEBERRY	native	
Ribes thacherianum (Jeps.) Munz	GROSSULARIACEAE	SANTA CRUZ ISLAND GOOSEBERRY	native	
Ribes tularense (Coville) Fedde	GROSSULARIACEAE	SEQUOIA GOOSEBERRY	native	
Ribes velutinum Greene	GROSSULARIACEAE		native	
Ribes viburnifolium A. Gray	GROSSULARIACEAE	SANTA CATALINA ISLAND CURRANT	native	
Ribes victoris Greene	GROSSULARIACEAE	VICTOR'S GOOSEBERRY	native	
Ribes viscosissimum Pursh	GROSSULARIACEAE	STICKY CURRANT	native	
Ricinus communis L.	EUPHORBIACEAE		naturalized	
Rigiopappus leptocladus A. Gray	ASTERACEAE		native	
Robinia neomexicana A. Gray	FABACEAE	NEW MEXICO LOCUST	native	
Robinia pseudoacacia L.	FABACEAE	BLACK LOCUST	naturalized	
Romanzoffia californica Greene	BORAGINACEAE		native	
Romanzoffia sitchensis Bong.	BORAGINACEAE		native	
Romanzoffia tracyi Jeps.	BORAGINACEAE	TRACY'S ROMANZOFFIA	native	
Romneya coulteri Harv.	PAPAVERACEAE	COULTER'S MATILIJA POPPY	native	
Romneya trichocalyx Eastw.	PAPAVERACEAE	HAIRY MATILIJA POPPY	native	
Romulea rosea (L.) Eckl.	IRIDACEAE		naturalized	
Romulea rosea (L.) Eckl. var. australis (Ewart) M. P. de Vos	IRIDACEAE		naturalized	
Rorippa austriaca (Crantz) Besser	BRASSICACEAE	AUSTRIAN FIELD-CRESS	naturalized	
Rorippa columbiae (S. Watson) Howell	BRASSICACEAE	COLUMBIA YELLOW CRESS	native	
Rorippa curvipes Greene	BRASSICACEAE		native	
Rorippa curvisiliqua (Hook.) Britton	BRASSICACEAE		native	
Rorippa palustris (L.) Besser	BRASSICACEAE		native	
Rorippa palustris (L.) Besser subsp. hispida (Desv.) Jonsell	BRASSICACEAE		native	
Rorippa palustris (L.) Besser subsp. palustris	BRASSICACEAE		native	
Rorippa sinuata (Nutt.) Hitchc.	BRASSICACEAE		native	
Rorippa sphaerocarpa (A. Gray) Britton	BRASSICACEAE		native	
Rorippa subumbellata Rollins	BRASSICACEAE	TAHOE YELLOW CRESS	native	
Rorippa tenerrima Greene	BRASSICACEAE		native	
Rosa bridgesii Crép. ex Rydb.	ROSACEAE	SIERRAN DWARF ROSE	native	
Rosa californica Cham. & Schltdl.	ROSACEAE	CALIFORNIA ROSE	native	
Rosa canina L.	ROSACEAE	DOG ROSE	naturalized	
Rosa gymnocarpa Nutt.	ROSACEAE	WOOD ROSE	native	
Rosa gymnocarpa Nutt. var. gymnocarpa	ROSACEAE		native	
Rosa gymnocarpa Nutt. var. serpentina Ertter & W.H. Lewis	ROSACEAE	GASQUET ROSE	native	
Rosa minutifolia Engelm.	ROSACEAE	SMALL-LEAVED ROSE	native	
Rosa multiflora Thunb.	ROSACEAE	MULTIFLORA ROSA	naturalized	
Rosa nutkana C. Presl	ROSACEAE		native	
Rosa nutkana C. Presl subsp. macdougalii (Holz.) Piper	ROSACEAE		native	
Rosa nutkana C. Presl subsp. nutkana	ROSACEAE	NOOTKA ROSE	native	
Rosa pinetorum A. Heller	ROSACEAE	PINE ROSE	native	
Rosa pisocarpa A. Gray	ROSACEAE	CLUSTER ROSE	native	
Rosa pisocarpa A. Gray subsp. ahartii Ertter & W.H. Lewis	ROSACEAE	AHART ROSE	native	
Rosa pisocarpa A. Gray subsp. pisocarpa	ROSACEAE	PEA ROSE	native	
Rosa rubiginosa L.	ROSACEAE	SWEET-BRIER	naturalized	
Rosa spithamea S. Watson	ROSACEAE	COAST GROUND ROSE	native	
Rosa woodsii Lindl.	ROSACEAE		native	
Rosa woodsii Lindl. subsp. gratissima (Greene) W. H. Lewis & Ertter	ROSACEAE	MOJAVE ROSE	native	
Rosa woodsii Lindl. subsp. ultramontana (S. Watson) Roy L. Taylor & MacBryde	ROSACEAE	INTERIOR ROSE	native	
Rotala indica (Willd.) Koehne	LYTHRACEAE		naturalized	
Rotala ramosior (L.) Koehne	LYTHRACEAE		native	
Rubus armeniacus Focke	ROSACEAE	HIMALAYAN BLACKBERRY	naturalized	
Rubus glaucifolius Kellogg	ROSACEAE	WAXLEAF RASPBERRY	native	
Rubus laciniatus Willd.	ROSACEAE	CUTLEAF BLACKBERRY	naturalized	
Rubus lasiococcus A. Gray	ROSACEAE	ROUGHFRUIT RASPBERRY	native	
Rubus leucodermis Douglas ex Torr. & A. Gray	ROSACEAE	WHITEBARK RASPBERRY	native	
Rubus nivalis Douglas	ROSACEAE	SNOW DWARF BRAMBLE	native	
Rubus parviflorus Nutt.	ROSACEAE	THIMBLEBERRY	native	
Rubus pensilvanicus Poir.	ROSACEAE		naturalized	
Rubus spectabilis Pursh	ROSACEAE	SALMONBERRY	native	
Rubus ulmifolius Schott	ROSACEAE	ELMLEAF BLACKBERRY	naturalized	
Rubus ulmifolius Schott var. anoplothyrsus Sudre	ROSACEAE		naturalized	
Rubus ursinus Cham. & Schltdl.	ROSACEAE	CALIFORNIA BLACKBERRY	native	
Rudbeckia californica A. Gray	ASTERACEAE	CALIFORNIA CONE-FLOWER	native	
Rudbeckia glaucescens Eastw.	ASTERACEAE	WAXY CONE-FLOWER	native	
Rudbeckia hirta L.	ASTERACEAE		naturalized	
Rudbeckia hirta L. var. pulcherrima Farw.	ASTERACEAE	BLACK-EYED SUSAN	naturalized	
Rudbeckia klamathensis P. B. Cox & Urbatsch	ASTERACEAE	KLAMATH CONE-FLOWER	native	
Rudbeckia occidentalis Nutt.	ASTERACEAE	WESTERN CONE-FLOWER	native	
Rumex acetosella L.	POLYGONACEAE	SHEEP SORREL	naturalized	
Rumex britannica L.	POLYGONACEAE		native	
Rumex californicus Rech. f.	POLYGONACEAE		native	
Rumex conglomeratus Murray	POLYGONACEAE		naturalized	
Rumex crassus Rech. f.	POLYGONACEAE		native	
Rumex crispus L.	POLYGONACEAE	CURLY DOCK	naturalized	
Rumex dentatus L.	POLYGONACEAE		naturalized	
Rumex fueginus Phil.	POLYGONACEAE	GOLDEN DOCK	native	
Rumex hymenosepalus Torr.	POLYGONACEAE	WILD-RHUBARB	native	
Rumex kerneri Borbás	POLYGONACEAE		naturalized	
Rumex lacustris Greene	POLYGONACEAE		native	
Rumex obtusifolius L.	POLYGONACEAE	BITTER DOCK	naturalized	
Rumex occidentalis S. Watson	POLYGONACEAE	WESTERN DOCK	native	
Rumex paucifolius Nutt.	POLYGONACEAE		native	
Rumex persicarioides L.	POLYGONACEAE		native	
Rumex pulcher L.	POLYGONACEAE	FIDDLE DOCK	naturalized	
Rumex salicifolius Weinm.	POLYGONACEAE	WILLOW DOCK	native	
Rumex stenophyllus Ledeb.	POLYGONACEAE		naturalized	
Rumex transitorius Rech. f.	POLYGONACEAE		native	
Rumex triangulivalvis (Danser) Rech. f.	POLYGONACEAE		native	
Rumex utahensis Rech. f.	POLYGONACEAE		native	
Rumex venosus Pursh	POLYGONACEAE	WINGED DOCK	native	
Rumex violascens Rech.f.	POLYGONACEAE		native	
Rupertia hallii (Rydb.) J. W. Grimes	FABACEAE	HALL'S RUPERTIA	native	
Rupertia physodes (Douglas) J. W. Grimes	FABACEAE		native	
Rupertia rigida (Parish) J. W. Grimes	FABACEAE	PARISH'S RUPERTIA	native	
Ruppia cirrhosa (Petagna) Grande	RUPPIACEAE		native	
Ruppia maritima L.	RUPPIACEAE		native	
Ruta chalepensis L.	RUTACEAE		naturalized	
Rytidosperma penicillatum (Labill.) Connor & Edgar	POACEAE	POVERTY GRASS	naturalized	
Rytidosperma racemosum (R. Br.) Connor & Edgar	POACEAE		naturalized	
Saccharum ravennae (L.) L.	POACEAE	RAVENNA GRASS	naturalized	
Sagina apetala Ard.	CARYOPHYLLACEAE	DWARF PEARLWORT	naturalized	
Sagina decumbens (Elliott) Torr. & A. Gray	CARYOPHYLLACEAE		native	
Sagina decumbens (Elliott) Torr. & A. Gray subsp. occidentalis (S. Watson) G. E. Crow	CARYOPHYLLACEAE	WESTERN PEARLWORT	native	
Sagina maxima A. Gray	CARYOPHYLLACEAE		native	
Sagina maxima A. Gray subsp. crassicaulis (S. Watson) G. E. Crow	CARYOPHYLLACEAE	THICK-STEMMED PEARLWORT	native	
Sagina procumbens L.	CARYOPHYLLACEAE	MATTED PEARLWORT	naturalized	
Sagina saginoides (L.) H. Karst.	CARYOPHYLLACEAE	ARCTIC PEARLWORT	native	
Sagittaria cuneata E. Sheld.	ALISMATACEAE		native	
Sagittaria latifolia Willd.	ALISMATACEAE		native	
Sagittaria longiloba Engelm. ex J. G. Sm.	ALISMATACEAE		native	
Sagittaria montevidensis Cham. & Schltdl.	ALISMATACEAE		native	
Sagittaria montevidensis Cham. & Schltdl. subsp. calycina (Engelm.) Bogin	ALISMATACEAE		native	
Sagittaria rigida Pursh	ALISMATACEAE	SESSILE-FRUITED ARROWHEAD	naturalized	
Sagittaria sanfordii Greene	ALISMATACEAE	SANFORD'S ARROWHEAD	native	
Salicornia bigelovii Torr.	CHENOPODIACEAE		native	
Salicornia depressa Standl.	CHENOPODIACEAE		native	
Salicornia pacifica Standl.	CHENOPODIACEAE		native	
Salicornia perennis Mill.	CHENOPODIACEAE		native	
Salicornia rubra A. Nelson	CHENOPODIACEAE		native	
Salix alba L.	SALICACEAE	WHITE WILLOW	naturalized	
Salix babylonica L.	SALICACEAE	WEEPING WILLOW	naturalized	
Salix bebbiana Sarg.	SALICACEAE	BEBB'S WILLOW	native	
Salix boothii Dorn	SALICACEAE	BOOTH'S WILLOW	native	
Salix brachycarpa Nutt.	SALICACEAE		native	
Salix brachycarpa Nutt. var. brachycarpa	SALICACEAE	SHORT-FRUITED WILLOW	native	
Salix breweri Bebb	SALICACEAE	BREWER'S WILLOW	native	
Salix delnortensis C. K. Schneid.	SALICACEAE	DEL NORTE WILLOW	native	
Salix drummondiana Barratt ex Hook.	SALICACEAE	DRUMMOND'S WILLOW	native	
Salix eastwoodiae A. Heller	SALICACEAE	SIERRA WILLOW	native	
Salix exigua Nutt.	SALICACEAE		native	
Salix exigua Nutt. var. exigua	SALICACEAE	COYOTE WILLOW	native	
Salix exigua Nutt. var. hindsiana (Benth.) Dorn	SALICACEAE	HINDS' WILLOW	native	
Salix geyeriana Andersson	SALICACEAE	GEYER'S WILLOW	native	
Salix gooddingii C. R. Ball	SALICACEAE	GOODDING'S BLACK WILLOW	native	
Salix hookeriana Barratt ex Hook.	SALICACEAE	COASTAL WILLOW	native	
Salix jepsonii C. K. Schneid.	SALICACEAE	JEPSON'S WILLOW	native	
Salix laevigata Bebb	SALICACEAE	RED WILLOW	native	
Salix lasiandra Benth.	SALICACEAE		native	
Salix lasiandra Benth. var. caudata (Nutt.) Sudw.	SALICACEAE	TAIL-LEAF WILLOW	native	
Salix lasiandra Benth. var. lasiandra	SALICACEAE	PACIFIC WILLOW	native	
Salix lasiolepis Benth.	SALICACEAE	ARROYO WILLOW	native	
Salix lemmonii Bebb	SALICACEAE	LEMMON'S WILLOW	native	
Salix ligulifolia C. R. Ball ex C. K. Schneid.	SALICACEAE	STRAP-LEAFED WILLOW	native	
Salix lutea Nutt.	SALICACEAE	YELLOW WILLOW	native	
Salix melanopsis Nutt.	SALICACEAE	DUSKY WILLOW	native	
Salix nivalis Hook.	SALICACEAE	SNOW WILLOW	native	
Salix orestera C. K. Schneid.	SALICACEAE	GRAY-LEAFED SIERRA WILLOW	native	
Salix petrophila Rydb.	SALICACEAE	ROCKY MOUNTAIN WILLOW	native	
Salix planifolia Pursh	SALICACEAE	TEA-LEAFED WILLOW	native	
Salix prolixa Andersson	SALICACEAE	MACKENZIE'S WILLOW	native	
Salix purpurea L.	SALICACEAE	BASKET WILLOW	naturalized	
Salix scouleriana Barratt ex Hook.	SALICACEAE	SCOULER'S WILLOW	native	
Salix sitchensis Sanson ex Bong.	SALICACEAE	SITKA WILLOW	native	
Salix tracyi C. R. Ball	SALICACEAE	TRACY'S WILLOW	native	
Salpichroa origanifolia (Lam.) Baill.	SOLANACEAE		naturalized	
Salsola australis R. Br.	CHENOPODIACEAE		naturalized	
Salsola damascena Botsch.	CHENOPODIACEAE		naturalized	
Salsola gobicola Iljin	CHENOPODIACEAE		naturalized	
Salsola paulsenii Litv.	CHENOPODIACEAE	BARBWIRE RUSSIAN THISTLE	naturalized	
Salsola ryanii Hrusa & Gaskin	CHENOPODIACEAE		naturalized	
Salsola soda L.	CHENOPODIACEAE		naturalized	
Salsola tragus L.	CHENOPODIACEAE	TUMBLEWEED	naturalized	
Saltugilia australis (H. Mason & A. D. Grant) L. A. Johnson	POLEMONIACEAE		native	
Saltugilia caruifolia (Abrams) L. A. Johnson	POLEMONIACEAE	CARAWAY-LEAVED WOODLAND-GILIA	native	
Saltugilia latimeri T. L. Weese & L. A. Johnson	POLEMONIACEAE	LATIMER'S WOODLAND-GILIA	native	
Saltugilia splendens (Douglas ex H. Mason & A. D. Grant) L. A. Johnson	POLEMONIACEAE	SPLENDID WOODLAND-GILIA	native	
Saltugilia splendens (Douglas ex H. Mason & A. D. Grant) L. A. Johnson subsp. grantii (Brand) L. A. Johnson	POLEMONIACEAE		native	
Saltugilia splendens (Douglas ex H. Mason & A. D. Grant) L. A. Johnson subsp. splendens	POLEMONIACEAE		native	
Salvia aethiopis L.	LAMIACEAE	MEDITERRANEAN SAGE	naturalized	
Salvia apiana Jeps.	LAMIACEAE	WHITE SAGE	native	
Salvia brandegeei Munz	LAMIACEAE	BRANDEGEE'S SAGE	native	
Salvia carduacea Benth.	LAMIACEAE	THISTLE SAGE	native	
Salvia clevelandii (A. Gray) Greene	LAMIACEAE		native	
Salvia columbariae Benth.	LAMIACEAE	CHIA	native	
Salvia dorrii (Kellogg) Abrams	LAMIACEAE		native	
Salvia dorrii (Kellogg) Abrams var. dorrii	LAMIACEAE		native	
Salvia dorrii (Kellogg) Abrams var. incana (Benth.) Strachan	LAMIACEAE	FLESHY SAGE	native	
Salvia dorrii (Kellogg) Abrams var. pilosa (A. Gray) Strachan & Reveal	LAMIACEAE		native	
Salvia eremostachya Jeps.	LAMIACEAE	DESERT SAGE	native	
Salvia funerea M. E. Jones	LAMIACEAE	DEATH VALLEY SAGE	native	
Salvia greatae Brandegee	LAMIACEAE	OROCOPIA SAGE	native	
Salvia leucophylla Greene	LAMIACEAE	PURPLE SAGE	native	
Salvia longistyla Benth.	LAMIACEAE		naturalized	
Salvia mellifera Greene	LAMIACEAE	BLACK SAGE	native	
Salvia mohavensis Greene	LAMIACEAE		native	
Salvia munzii Epling	LAMIACEAE	MUNZ'S SAGE	native	
Salvia pachyphylla Munz	LAMIACEAE		native	
Salvia sonomensis Greene	LAMIACEAE		native	
Salvia spathacea Greene	LAMIACEAE	CALIFORNIA HUMMINGBIRD SAGE	native	
Salvia vaseyi (Porter) Parish	LAMIACEAE		native	
Salvia virgata Jacq.	LAMIACEAE	MEADOW SAGE	naturalized	
Salvinia minima Baker	SALVINIACEAE		naturalized	
Salvinia molesta D. S. Mitch.	SALVINIACEAE		naturalized	
Sambucus nigra L.	ADOXACEAE		native	
Sambucus nigra L. subsp. caerulea (Raf.) Bolli	ADOXACEAE	BLUE ELDERBERRY	native	
Sambucus racemosa L.	ADOXACEAE		native	
Sambucus racemosa L. var. melanocarpa (A. Gray) McMinn	ADOXACEAE	BLACK ELDERBERRY	native	
Sambucus racemosa L. var. racemosa	ADOXACEAE	RED ELDERBERRY	native	
Samolus parviflorus Raf.	THEOPHRASTACEAE	SEASIDE BROOKWEED	native	
Sanguisorba officinalis L.	ROSACEAE	GREAT BURNET	native	
Sanicula arctopoides Hook. & Arn.	APIACEAE	YELLOW MATS	native	
Sanicula arguta J. M. Coult. & Rose	APIACEAE		native	
Sanicula bipinnata Hook. & Arn.	APIACEAE	POISON SANICLE	native	
Sanicula bipinnatifida Hook.	APIACEAE	SHOE BUTTONS	native	
Sanicula crassicaulis DC.	APIACEAE		native	
Sanicula graveolens DC.	APIACEAE		native	
Sanicula hoffmannii (Munz) R. H. Shan & Constance	APIACEAE	HOFFMANN'S SANICLE	native	
Sanicula laciniata Hook. & Arn.	APIACEAE		native	
Sanicula maritima S. Watson	APIACEAE	ADOBE SANICLE	native	
Sanicula peckiana J. F. Macbr.	APIACEAE	PECK'S SANICLE	native	
Sanicula saxatilis Greene	APIACEAE	ROCK SANICLE	native	
Sanicula tracyi R. H. Shan & Constance	APIACEAE	TRACY'S SANICLE	native	
Sanicula tuberosa Torr.	APIACEAE		native	
Sanvitalia abertii A. Gray	ASTERACEAE	ABERT'S SANVITALIA	native	
Saponaria officinalis L.	CARYOPHYLLACEAE		naturalized	
Sarcobatus baileyi Coville	SARCOBATACEAE		native	
Sarcobatus vermiculatus (Hook.) Torr.	SARCOBATACEAE		native	
Sarcodes sanguinea Torr.	ERICACEAE		native	
Sarracenia purpurea L.	SARRACENIACEAE		naturalized	
Sarracenia purpurea L. subsp. purpurea	SARRACENIACEAE		naturalized	
Sarracenia purpurea L. subsp. venosa (Raf.) Wherry	SARRACENIACEAE		naturalized	
Saussurea americana D. C. Eaton	ASTERACEAE	AMERICAN SAW-WORT	native	
Saxifraga cespitosa L.	SAXIFRAGACEAE	TUFTED SAXIFRAGE	native	
Saxifraga hyperborea R. Br.	SAXIFRAGACEAE		native	
Saxifraga mertensiana Bong.	SAXIFRAGACEAE		native	
Saxifragopsis fragarioides (Greene) Small	SAXIFRAGACEAE		native	
Scabiosa atropurpurea L.	DIPSACACEAE		naturalized	
Scandix pecten-veneris L.	APIACEAE	VENUS' NEEDLE	naturalized	
Sceptridium multifidum (S.G. Gmel.) M. Nishida ex Tagawa	OPHIOGLOSSACEAE	LEATHER GRAPE-FERN	native	
Scheuchzeria palustris L.	SCHEUCHZERIACEAE	SCHEUCHZERIA	native	
Schinus molle L.	ANACARDIACEAE	PEPPER TREE	naturalized	
Schinus polygamus (Cav.) Cabrera	ANACARDIACEAE	CHILEAN PEPPER TREE	naturalized	
Schinus terebinthifolius Raddi	ANACARDIACEAE	BRAZILIAN PEPPER TREE	naturalized	
Schismus arabicus Nees	POACEAE		naturalized	
Schismus barbatus (L.) Thell.	POACEAE		naturalized	
Schoenoplectus acutus (Muhl. ex Bigelow) Á. Löve & D. Löve	CYPERACEAE		native	
Schoenoplectus acutus (Muhl. ex Bigelow) Á. Löve & D. Löve var. occidentalis (S. Watson) S. G. Sm.	CYPERACEAE	COMMON TULE	native	
Schoenoplectus americanus (Pers.) Volkart ex Schinz & R. Keller	CYPERACEAE	OLNEY'S THREE-SQUARE BULRUSH	native	
Schoenoplectus californicus (C. A. Mey.) Soják	CYPERACEAE	SOUTHERN BULRUSH	native	
Schoenoplectus heterochaetus (Chase) Soják	CYPERACEAE	SLENDER BULRUSH	native	
Schoenoplectus mucronatus (L.) Palla	CYPERACEAE	RICE-FIELD BULRUSH	naturalized	
Schoenoplectus pungens (Vahl) Palla	CYPERACEAE		native	
Schoenoplectus pungens (Vahl) Palla var. longispicatus (Britton) S. G. Sm.	CYPERACEAE	COMMON THREE-SQUARE BULRUSH	native	
Schoenoplectus saximontanus (Fernald) J. Raynal	CYPERACEAE	ROCKY MOUNTAIN BULRUSH	native	
Schoenoplectus subterminalis (Torr.) Soják	CYPERACEAE	WATER BULRUSH	native	
Schoenoplectus tabernaemontani (C. C. Gmel.) Palla	CYPERACEAE	SOFT-STEM BULRUSH	native	
Schoenus nigricans L.	CYPERACEAE	BLACK BOG-RUSH	native	
Scirpus congdonii Britton	CYPERACEAE		native	
Scirpus cyperinus (L.) Kunth	CYPERACEAE		naturalized	
Scirpus diffusus Schuyler	CYPERACEAE		native	
Scirpus microcarpus J. Presl & C. Presl	CYPERACEAE		native	
Scirpus pendulus Muhl.	CYPERACEAE	PENDULOUS BULRUSH	native	
Scleranthus annuus L.	CARYOPHYLLACEAE		naturalized	
Scleranthus annuus L. subsp. annuus	CARYOPHYLLACEAE		naturalized	
Sclerocactus johnsonii (Parry ex Engelm.) N. P. Taylor	CACTACEAE	JOHNSON'S BEE-HIVE CACTUS	native	
Sclerocactus polyancistrus (Engelm. & J. M. Bigelow) Britton & Rose	CACTACEAE	MOJAVE FISHHOOK CACTUS	native	
Sclerochloa dura (L.) P. Beauv.	POACEAE	FAIRGROUND GRASS	naturalized	
Sclerolinon digynum (A. Gray) C. M. Rogers	LINACEAE		native	
Scleropogon brevifolius Phil.	POACEAE	BURRO GRASS	native	
Scoliopus bigelovii Torr.	LILIACEAE		native	
Scolymus hispanicus L.	ASTERACEAE		naturalized	
Scopulophila rixfordii (Brandegee) Munz & I. M. Johnst.	CARYOPHYLLACEAE	RIXFORD ROCKWORT	native	
Scorzonera hispanica L.	ASTERACEAE	VIPER'S GRASS	naturalized	
Scribneria bolanderi (Thurb.) Hack.	POACEAE		native	
Scrophularia atrata Pennell	SCROPHULARIACEAE	BLACK-FLOWERED FIGWORT	native	
Scrophularia californica Cham. & Schltdl.	SCROPHULARIACEAE	CALIFORNIA FIGWORT	native	
Scrophularia desertorum (Munz) R. J. Shaw	SCROPHULARIACEAE		native	
Scrophularia lanceolata Pursh	SCROPHULARIACEAE		native	
Scrophularia peregrina L.	SCROPHULARIACEAE		naturalized	
Scrophularia villosa Pennell	SCROPHULARIACEAE	SANTA CATALINA FIGWORT	native	
Scutellaria antirrhinoides Benth.	LAMIACEAE		native	
Scutellaria bolanderi A. Gray	LAMIACEAE		native	
Scutellaria bolanderi A. Gray subsp. austromontana Epling	LAMIACEAE	SOUTHERN MOUNTAINS SKULLCAP	native	
Scutellaria bolanderi A. Gray subsp. bolanderi	LAMIACEAE		native	
Scutellaria californica A. Gray	LAMIACEAE		native	
Scutellaria galericulata L.	LAMIACEAE	MARSH SKULLCAP	native	
Scutellaria lateriflora L.	LAMIACEAE	SIDE-FLOWERING SKULLCAP	native	
Scutellaria mexicana (Torr.) A.J. Paton	LAMIACEAE	BLADDER-SAGE	native	
Scutellaria nana A. Gray	LAMIACEAE		native	
Scutellaria siphocampyloides Vatke	LAMIACEAE		native	
Scutellaria tuberosa Benth.	LAMIACEAE		native	
Searsia lancea (L. f.) F.A. Barkley	ANACARDIACEAE	AFRICAN SUMAC	naturalized	
Secale cereale L.	POACEAE		naturalized	
Sedella leiocarpa H. Sharsm.	CRASSULACEAE	LAKE COUNTY STONECROP	native	
Sedella pentandra H. Sharsm.	CRASSULACEAE		native	
Sedella pumila (Benth.) Britton & Rose	CRASSULACEAE		native	
Sedum albomarginatum R. T. Clausen	CRASSULACEAE	FEATHER RIVER STONECROP	native	
Sedum album L.	CRASSULACEAE	WHITE STONECROP	naturalized	
Sedum divergens S. Watson	CRASSULACEAE	CASCADE STONECROP	native	
Sedum lanceolatum Torr.	CRASSULACEAE	SPEARLEAF STONECROP	native	
Sedum laxum (Britton) A. Berger	CRASSULACEAE		native	
Sedum laxum (Britton) A. Berger subsp. eastwoodiae (Britton) R.T. Clausen	CRASSULACEAE	RED MOUNTAIN STONECROP	native	
Sedum laxum (Britton) A. Berger subsp. flavidum Denton	CRASSULACEAE	PALE-YELLOW STONECROP	native	
Sedum laxum (Britton) A. Berger subsp. heckneri (M. Peck) R. T. Clausen	CRASSULACEAE	HECKNER'S STONECROP	native	
Sedum laxum (Britton) A. Berger subsp. laxum	CRASSULACEAE	ROSEFLOWER STONECROP	native	
Sedum niveum Davidson	CRASSULACEAE	DAVIDSON'S STONECROP	native	
Sedum oblanceolatum R. T. Clausen	CRASSULACEAE	APPLEGATE STONECROP	native	
Sedum obtusatum A. Gray	CRASSULACEAE	SIERRA STONECROP	native	
Sedum obtusatum A. Gray subsp. boreale R. T. Clausen	CRASSULACEAE		native	
Sedum obtusatum A. Gray subsp. obtusatum	CRASSULACEAE		native	
Sedum obtusatum A. Gray subsp. paradisum Denton	CRASSULACEAE	CANYON CREEK STONECROP	native	
Sedum obtusatum A. Gray subsp. retusum (Rose) R. T. Clausen	CRASSULACEAE		native	
Sedum oreganum Nutt.	CRASSULACEAE	OREGON STONECROP	native	
Sedum oregonense (S. Watson) M. Peck	CRASSULACEAE	CREAM STONECROP	native	
Sedum praealtum A. DC.	CRASSULACEAE	GREEN COCKSCOMB	naturalized	
Sedum radiatum S. Watson	CRASSULACEAE	COAST RANGE STONECROP	native	
Sedum spathulifolium Hook.	CRASSULACEAE	BROADLEAF STONECROP	native	
Sedum stenopetalum Pursh	CRASSULACEAE		native	
Selaginella asprella Maxon	SELAGINELLACEAE	BLUISH SPIKE-MOSS	native	
Selaginella bigelovii Underw.	SELAGINELLACEAE		native	
Selaginella cinerascens A. A. Eaton	SELAGINELLACEAE	ASHY SPIKE-MOSS	native	
Selaginella eremophila Maxon	SELAGINELLACEAE	DESERT SPIKE-MOSS	native	
Selaginella hansenii Hieron.	SELAGINELLACEAE		native	
Selaginella kraussiana (Kunze) A. Braun	SELAGINELLACEAE		naturalized	acceptance uncertain
Selaginella leucobryoides Maxon	SELAGINELLACEAE	MOJAVE SPIKE-MOSS	native	
Selaginella oregana D. C. Eaton	SELAGINELLACEAE		native	
Selaginella scopulorum Maxon	SELAGINELLACEAE	ROCKY MOUNTAIN SPIKE-MOSS	native	
Selaginella wallacei Hieron.	SELAGINELLACEAE		native	
Selaginella watsonii Underw.	SELAGINELLACEAE		native	
Senecio aphanactis Greene	ASTERACEAE	CHAPARRAL RAGWORT	native	
Senecio aronicoides DC.	ASTERACEAE	RAYLESS RAGWORT	native	
Senecio astephanus Greene	ASTERACEAE	SAN GABRIEL RAGWORT	native	
Senecio blochmaniae Greene	ASTERACEAE	BLOCHMAN'S RAGWORT	native	
Senecio californicus DC.	ASTERACEAE	CALIFORNIA RAGWORT	native	
Senecio clarkianus A. Gray	ASTERACEAE	CLARK'S RAGWORT	native	
Senecio elegans L.	ASTERACEAE	RED-PURPLE RAGWORT	naturalized	
Senecio flaccidus Less.	ASTERACEAE	THREADLEAF RAGWORT	native	
Senecio flaccidus Less. var. douglasii (DC.) B. L. Turner & T. Barkley	ASTERACEAE	DOUGLAS' THREADLEAF RAGWORT	native	
Senecio flaccidus Less. var. monoensis (Greene) B. L. Turner & T. Barkley	ASTERACEAE	SMOOTH THREADLEAF RAGWORT	native	
Senecio fremontii Torr. & A. Gray	ASTERACEAE		native	
Senecio fremontii Torr. & A. Gray var. fremontii	ASTERACEAE	DWARF MOUNTAIN RAGWORT	native	
Senecio fremontii Torr. & A. Gray var. occidentalis A. Gray	ASTERACEAE	WESTERN DWARF MOUNTAIN RAGWORT	native	
Senecio glomeratus Desf. ex Poir.	ASTERACEAE	CUTLEAF BURNWEED	naturalized	
Senecio hydrophiloides Rydb.	ASTERACEAE	SWEET MARSH RAGWORT	native	
Senecio hydrophilus Nutt.	ASTERACEAE	ALKALI-MARSH RAGWORT	native	
Senecio integerrimus Nutt.	ASTERACEAE		native	
Senecio integerrimus Nutt. var. exaltatus (Nutt.) Cronquist	ASTERACEAE	COLUMBIA RAGWORT	native	
Senecio integerrimus Nutt. var. major (A. Gray) Cronquist	ASTERACEAE	LAMBS-TONGUE RAGWORT	native	
Senecio integerrimus Nutt. var. ochroleucus (A. Gray) Cronquist	ASTERACEAE	PALE-YELLOW RAGWORT	native	
Senecio jacobaea L.	ASTERACEAE	TANSY RAGWORT	naturalized	
Senecio linearifolius A. Rich.	ASTERACEAE		naturalized	
Senecio linearifolius A. Rich. var. linearifolius	ASTERACEAE	LINEAR-LEAVED AUSTRALIAN FIREWEED	naturalized	
Senecio lyonii A. Gray	ASTERACEAE	ISLAND SENECIO	native	
Senecio minimus Poir.	ASTERACEAE	COASTAL BURNWEED	naturalized	
Senecio mohavensis A. Gray	ASTERACEAE	MOJAVE RAGWORT	native	
Senecio pattersonensis Hoover	ASTERACEAE	MOUNT PATTERSON SENECIO	native	
Senecio quadridentatus Labill.	ASTERACEAE	COTTON BURNWEED	naturalized	
Senecio scorzonella Greene	ASTERACEAE	SIERRA RAGWORT	native	
Senecio serra Hook.	ASTERACEAE		native	
Senecio serra Hook. var. serra	ASTERACEAE	SAWTOOTH GROUNDSEL	native	
Senecio spartioides Torr. & A. Gray	ASTERACEAE	BROOM-LIKE RAGWORT	native	
Senecio sylvaticus L.	ASTERACEAE	WOODLAND RAGWORT	naturalized	
Senecio triangularis Hook.	ASTERACEAE	ARROWLEAF RAGWORT	native	
Senecio vulgaris L.	ASTERACEAE	COMMON GROUNDSEL	naturalized	
Senegalia greggii Britton & Rose	FABACEAE	DEVIL'S CLAW	native	
Senna armata (S. Watson) H. S. Irwin & Barneby	FABACEAE	SPINY SENNA	native	
Senna artemisioides (Gaudich. ex DC.) Randell	FABACEAE	SILVER SENNA	naturalized	
Senna covesii (A. Gray) H. S. Irwin & Barneby	FABACEAE	COUES' CASSIA	native	
Senna didymobotrya (Fresen.) H. S. Irwin & Barneby	FABACEAE		naturalized	
Senna multiglandulosa (Jacq.) H. S. Irwin & Barneby	FABACEAE		naturalized	
Sequoia sempervirens (D. Don) Endl.	CUPRESSACEAE		native	
Sequoiadendron giganteum (Lindl.) J. Buchholz	CUPRESSACEAE		native	
Sericocarpus oregonensis Nutt.	ASTERACEAE		native	
Sericocarpus oregonensis Nutt. subsp. californicus (Durand) Ferris	ASTERACEAE		native	
Sericocarpus oregonensis Nutt. subsp. oregonensis	ASTERACEAE		native	
Sesbania herbacea (Mill.) McVaugh	FABACEAE	COLORADO RIVER HEMP	native	
Sesbania punicea (Cav.) Benth.	FABACEAE	SCARLET SESBAN	naturalized	
Sesuvium verrucosum Raf.	AIZOACEAE	WESTERN SEA-PURSLANE	native	
Setaria adhaerens (Forssk.) Chiov.	POACEAE	BUR BRISTLE GRASS	naturalized	
Setaria faberi R. A. W. Herrm.	POACEAE	CHINESE FOXTAIL	naturalized	
Setaria parviflora (Poir.) Kerguélen	POACEAE	KNOTROOT BRISTLE GRASS	native	
Setaria pumila (Poir.) Roem. & Schult.	POACEAE		naturalized	
Setaria pumila (Poir.) Roem. & Schult. subsp. pumila	POACEAE	YELLOW BRISTLE GRASS	naturalized	
Setaria sphacelata (Schumach.) M. B. Moss ex Stapf & C. E. Hubb.	POACEAE	AFRICAN BRISTLE GRASS	naturalized	
Setaria verticillata (L.) P. Beauv.	POACEAE	HOOKED BRISTLE GRASS	naturalized	
Setaria viridis (L.) P. Beauv.	POACEAE	GREEN BRISTLE GRASS	naturalized	
Shepherdia argentea (Pursh) Nutt.	ELAEAGNACEAE	BUFFALO-BERRY	native	
Shepherdia canadensis (L.) Nutt.	ELAEAGNACEAE	CANADIAN BUFFALO-BERRY	native	
Sherardia arvensis L.	RUBIACEAE	FIELD MADDER	naturalized	
Sibara deserti (M. E. Jones) Rollins	BRASSICACEAE	DESERT WINGED ROCKCRESS	native	
Sibara filifolia (Greene) Greene	BRASSICACEAE	SANTA CRUZ ISLAND ROCKCRESS	native	
Sibaropsis hammittii S. D. Boyd & T. S. Ross	BRASSICACEAE	HAMMITT'S CLAY-CRESS	native	
Sibbaldia procumbens L.	ROSACEAE		native	
Sidalcea asprella Greene	MALVACEAE		native	
Sidalcea asprella Greene subsp. asprella	MALVACEAE	SIERRA FOOTHILLS CHECKERBLOOM	native	
Sidalcea asprella Greene subsp. nana (Jeps.) S.R. Hill	MALVACEAE	DWARF SIERRAN CHECKERBLOOM	native	
Sidalcea calycosa M. E. Jones	MALVACEAE	VERNAL POOL CHECKERBLOOM	native	
Sidalcea calycosa M. E. Jones subsp. calycosa	MALVACEAE	HOGWALLOW CHECKERBLOOM	native	
Sidalcea calycosa M. E. Jones subsp. rhizomata (Jeps.) Munz	MALVACEAE	POINT REYES CHECKERBLOOM	native	
Sidalcea celata (Jeps.) S. R. Hill	MALVACEAE	REDDING CHECKERBLOOM	native	
Sidalcea covillei Greene	MALVACEAE	OWENS VALLEY CHECKERBLOOM	native	
Sidalcea diploscypha (Torr. & A. Gray) A. Gray	MALVACEAE	FRINGED CHECKERBLOOM	native	
Sidalcea elegans Greene	MALVACEAE	DEL NORTE CHECKERBLOOM	native	
Sidalcea gigantea G. Clifton, R. E. Buck, & S. R. Hill	MALVACEAE	GIANT CHECKERBLOOM	native	
Sidalcea glaucescens Greene	MALVACEAE	WAXY CHECKERBLOOM	native	
Sidalcea hartwegii A. Gray	MALVACEAE	HARTWEG'S CHECKERBLOOM	native	
Sidalcea hickmanii Greene	MALVACEAE		native	
Sidalcea hickmanii Greene subsp. anomala C. L. Hitchc.	MALVACEAE	CUESTA PASS CHECKERBLOOM	native	
Sidalcea hickmanii Greene subsp. hickmanii	MALVACEAE	HICKMAN'S CHECKERBLOOM	native	
Sidalcea hickmanii Greene subsp. napensis S. R. Hill	MALVACEAE	NAPA CHECKERBLOOM	native	
Sidalcea hickmanii Greene subsp. parishii (B. L. Rob.) C. L. Hitchc.	MALVACEAE	PARISH'S CHECKERBLOOM	native	
Sidalcea hickmanii Greene subsp. pillsburiensis S. R. Hill	MALVACEAE	LAKE PILLSBURY CHECKERBLOOM	native	
Sidalcea hickmanii Greene subsp. viridis C. L. Hitchc.	MALVACEAE	MARIN CHECKERBLOOM	native	
Sidalcea hirsuta A. Gray	MALVACEAE	HAIRY CHECKERBLOOM	native	
Sidalcea keckii Wiggins	MALVACEAE	KECK'S CHECKERBLOOM	native	
Sidalcea malachroides (Hook. & Arn.) A. Gray	MALVACEAE	MAPLE-LEAVED CHECKERBLOOM	native	
Sidalcea malviflora (DC.) A. Gray	MALVACEAE	CHECKERMALLOW	native	
Sidalcea malviflora (DC.) A. Gray subsp. californica (Torr. & A. Gray) C. L. Hitchc.	MALVACEAE	CALIFORNIA CHECKERBLOOM	native	
Sidalcea malviflora (DC.) A. Gray subsp. dolosa C. L. Hitchc.	MALVACEAE	BEAR VALLEY CHECKERBLOOM	native	
Sidalcea malviflora (DC.) A. Gray subsp. laciniata C. L. Hitchc.	MALVACEAE	GERANIUM-LEAVED CHECKERBLOOM	native	
Sidalcea malviflora (DC.) A. Gray subsp. malviflora	MALVACEAE		native	
Sidalcea malviflora (DC.) A. Gray subsp. patula C. L. Hitchc.	MALVACEAE	SISKIYOU CHECKERBLOOM	native	
Sidalcea malviflora (DC.) A. Gray subsp. purpurea C. L. Hitchc.	MALVACEAE	PURPLE-STEMMED CHECKERBLOOM	native	
Sidalcea malviflora (DC.) A. Gray subsp. rostrata (Eastw.) Wiggins	MALVACEAE	SEACLIFF CHECKERBLOOM	native	
Sidalcea multifida Greene	MALVACEAE	CUT-LEAF CHECKERBLOOM	native	
Sidalcea neomexicana A. Gray	MALVACEAE	SALT SPRING CHECKERBLOOM	native	
Sidalcea oregana (Torr. & A. Gray) A. Gray	MALVACEAE		native	
Sidalcea oregana (Torr. & A. Gray) A. Gray subsp. eximia (Greene) C. L. Hitchc.	MALVACEAE	COAST CHECKERBLOOM	native	
Sidalcea oregana (Torr. & A. Gray) A. Gray subsp. hydrophila (A. Heller) C. L. Hitchc.	MALVACEAE	MARSH CHECKERBLOOM	native	
Sidalcea oregana (Torr. & A. Gray) A. Gray subsp. oregana	MALVACEAE	OREGON CHECKERBLOOM	native	
Sidalcea oregana (Torr. & A. Gray) A. Gray subsp. spicata (Regel) C. L. Hitchc.	MALVACEAE		native	
Sidalcea oregana (Torr. & A. Gray) A. Gray subsp. valida (Greene) C. L. Hitchc.	MALVACEAE	KENWOOD MARSH CHECKERBLOOM	native	
Sidalcea pedata A. Gray	MALVACEAE	BIRD-FOOT CHECKERBLOOM	native	
Sidalcea ranunculacea Greene	MALVACEAE		native	
Sidalcea reptans Greene	MALVACEAE		native	
Sidalcea robusta A. Heller ex Roush	MALVACEAE	BUTTE COUNTY CHECKERBLOOM	native	
Sidalcea setosa C. L. Hitchc.	MALVACEAE	BRISTLY CHECKERBLOOM	native	
Sidalcea sparsifolia (C. L. Hitchc.) S. R. Hill	MALVACEAE	SOUTHERN CHECKERBLOOM	native	
Sidalcea stipularis J. T. Howell & G. H. True	MALVACEAE	SCADDEN FLAT CHECKERBLOOM	native	
Sidotheca caryophylloides (Parry) Reveal	POLYGONACEAE	CHICKWEED OXYTHECA	native	
Sidotheca emarginata (H. M. Hall) Reveal	POLYGONACEAE	WHITE-MARGINED OXYTHECA	native	
Sidotheca trilobata (A. Gray) Reveal	POLYGONACEAE	THREE-LOBED STARRY PUNCTUREBRACT	native	
Silene antirrhina L.	CARYOPHYLLACEAE	SLEEPY CATCHFLY	native	
Silene aperta Greene	CARYOPHYLLACEAE	TULARE CAMPION	native	
Silene armeria L.	CARYOPHYLLACEAE	SWEET-WILLIAM CATCHFLY	naturalized	
Silene bernardina S. Watson	CARYOPHYLLACEAE	PALMER'S CATCHFLY	native	
Silene bolanderi A. Gray	CARYOPHYLLACEAE	BOLANDER'S CATCHFLY	native	
Silene bridgesii Rohrb.	CARYOPHYLLACEAE	BRIDGES' CATCHFLY	native	
Silene campanulata S. Watson	CARYOPHYLLACEAE		native	
Silene campanulata S. Watson subsp. campanulata	CARYOPHYLLACEAE	RED MOUNTAIN CATCHFLY	native	
Silene campanulata S. Watson subsp. glandulosa C. L. Hitchc. & Maguire	CARYOPHYLLACEAE	BELL CATCHFLY	native	
Silene coniflora Nees ex Otth	CARYOPHYLLACEAE	MULTINERVED CATCHFLY	naturalized	
Silene conoidea L.	CARYOPHYLLACEAE	LARGE SAND CATCHFLY	naturalized	
Silene dichotoma Ehrh.	CARYOPHYLLACEAE		naturalized	
Silene dichotoma Ehrh. subsp. dichotoma	CARYOPHYLLACEAE	FORKED CATCHFLY	naturalized	
Silene douglasii Hook.	CARYOPHYLLACEAE		native	
Silene douglasii Hook. var. douglasii	CARYOPHYLLACEAE	DOUGLAS' CATCHFLY	native	
Silene gallica L.	CARYOPHYLLACEAE	WINDMILL PINK	naturalized	
Silene grayi S. Watson	CARYOPHYLLACEAE	GRAY'S CATCHFLY	native	
Silene hookeri Nutt.	CARYOPHYLLACEAE	HOOKER'S CATCHFLY	native	
Silene invisa C. L. Hitchc. & Maguire	CARYOPHYLLACEAE	SHORT-PETALED CAMPION	native	
Silene laciniata Cav.	CARYOPHYLLACEAE		native	
Silene laciniata Cav. subsp. californica (Durand) J. K. Morton	CARYOPHYLLACEAE	CALIFORNIA PINK	native	
Silene laciniata Cav. subsp. laciniata	CARYOPHYLLACEAE	MEXICAN PINK	native	
Silene latifolia Poir.	CARYOPHYLLACEAE	WHITE CAMPION	naturalized	
Silene lemmonii S. Watson	CARYOPHYLLACEAE	LEMMON'S CATCHFLY	native	
Silene marmorensis Kruckeb.	CARYOPHYLLACEAE	MARBLE MOUNTAIN CAMPION	native	
Silene menziesii Hook.	CARYOPHYLLACEAE	MENZIES' CATCHFLY	native	
Silene noctiflora L.	CARYOPHYLLACEAE	NIGHT-FLOWERING CATCHFLY	naturalized	
Silene nuda (S. Watson) C. L. Hitchc. & Maguire	CARYOPHYLLACEAE	STICKY CATCHFLY	native	
Silene occidentalis S. Watson	CARYOPHYLLACEAE	WESTERN CAMPION	native	
Silene oregana S. Watson	CARYOPHYLLACEAE	OREGON CAMPION	native	
Silene parishii S. Watson	CARYOPHYLLACEAE	PARISH'S CATCHFLY	native	
Silene salmonacea T. W. Nelson, J. P. Nelson, & S. A. Erwin	CARYOPHYLLACEAE	SALMON-FLOWERED CATCHFLY	native	
Silene sargentii S. Watson	CARYOPHYLLACEAE	SARGENT'S CATCHFLY	native	
Silene scouleri Hook.	CARYOPHYLLACEAE		native	
Silene scouleri Hook. subsp. scouleri	CARYOPHYLLACEAE	SCOULER'S CATCHFLY	native	
Silene serpentinicola T. W. Nelson & J. P. Nelson	CARYOPHYLLACEAE	SERPENTINE CATCHFLY	native	
Silene suksdorfii B. L. Rob.	CARYOPHYLLACEAE	SUKSDORF'S CATCHFLY	native	
Silene verecunda S. Watson	CARYOPHYLLACEAE	SAN FRANCISCO CAMPION	native	
Silene vulgaris (Moench) Garcke	CARYOPHYLLACEAE	BLADDER CAMPION	naturalized	
Silybum marianum (L.) Gaertn.	ASTERACEAE		naturalized	
Simmondsia chinensis (Link) C. K. Schneid.	SIMMONDSIACEAE		native	
Sinapis alba L.	BRASSICACEAE	WHITE MUSTARD	naturalized	
Sinapis arvensis L.	BRASSICACEAE	CHARLOCK	naturalized	
Sisymbrium altissimum L.	BRASSICACEAE	TUMBLE MUSTARD	naturalized	
Sisymbrium erysimoides Desf.	BRASSICACEAE		naturalized	
Sisymbrium irio L.	BRASSICACEAE	LONDON ROCKET	naturalized	
Sisymbrium loeselii L.	BRASSICACEAE		naturalized	
Sisymbrium officinale (L.) Scop.	BRASSICACEAE	HEDGE MUSTARD	naturalized	
Sisymbrium orientale L.	BRASSICACEAE		naturalized	
Sisyrinchium bellum S. Watson	IRIDACEAE	WESTERN BLUE-EYED-GRASS	native	
Sisyrinchium californicum (Ker Gawl.) W. T. Aiton	IRIDACEAE	GOLDEN-EYED-GRASS	native	
Sisyrinchium elmeri Greene	IRIDACEAE	ELMER'S BLUE-EYED-GRASS	native	
Sisyrinchium funereum E. P. Bicknell	IRIDACEAE	DEATH VALLEY BLUE-EYED-GRASS	native	
Sisyrinchium halophilum Greene	IRIDACEAE	NEVADA BLUE-EYED-GRASS	native	
Sisyrinchium hitchcockii Douglass M. Hend.	IRIDACEAE	HITCHCOCK'S BLUE-EYED-GRASS	native	
Sisyrinchium idahoense E. P. Bicknell	IRIDACEAE	IDAHO BLUE-EYED-GRASS	native	
Sisyrinchium idahoense E. P. Bicknell var. idahoense	IRIDACEAE		native	
Sisyrinchium idahoense E. P. Bicknell var. occidentale (E. P. Bicknell) Douglass M. Hend.	IRIDACEAE		native	
Sisyrinchium longipes (E. P. Bicknell) Kearney & Peebles	IRIDACEAE	TIMBERLAND BLUE-EYED-GRASS	native	
Sium suave Walter	APIACEAE		native	
Smelowskia ovalis M. E. Jones	BRASSICACEAE		native	
Smilax californica (A. DC.) A. Gray	SMILACACEAE		native	
Smilax jamesii G. A. Wallace	SMILACACEAE	ENGLISH PEAK GREENBRIER	native	
Solanum americanum Mill.	SOLANACEAE		native	
Solanum aviculare G. Forst.	SOLANACEAE		naturalized	
Solanum carolinense L.	SOLANACEAE	CAROLINA HORSE-NETTLE	naturalized	
Solanum douglasii Dunal	SOLANACEAE		native	
Solanum dulcamara L.	SOLANACEAE		naturalized	
Solanum elaeagnifolium Cav.	SOLANACEAE	WHITE HORSE-NETTLE	naturalized	
Solanum furcatum Dunal	SOLANACEAE		naturalized	
Solanum lanceolatum Cav.	SOLANACEAE	LANCELEAF NIGHTSHADE	naturalized	
Solanum marginatum L. f.	SOLANACEAE	WHITE-MARGINED NIGHTSHADE	naturalized	
Solanum mauritianum Scop.	SOLANACEAE		naturalized	
Solanum nigrum L.	SOLANACEAE	BLACK NIGHTSHADE	naturalized	
Solanum parishii A. Heller	SOLANACEAE		native	
Solanum physalifolium Rusby	SOLANACEAE		naturalized	
Solanum physalifolium Rusby var. nitidibaccatum (Bitter) Edmonds	SOLANACEAE		naturalized	
Solanum rostratum Dunal	SOLANACEAE	BUFFALO BERRY	naturalized	
Solanum sisymbriifolium Lam.	SOLANACEAE		naturalized	
Solanum triflorum Nutt.	SOLANACEAE		naturalized	
Solanum umbelliferum Eschsch.	SOLANACEAE		native	
Solanum wallacei (A. Gray) Parish	SOLANACEAE	WALLACE'S NIGHTSHADE	native	
Solanum xanti A. Gray	SOLANACEAE		native	
Soleirolia soleirolii (Req.) Dandy	URTICACEAE		naturalized	
Solidago altissima L.	ASTERACEAE		naturalized	
Solidago altissima L. subsp. altissima	ASTERACEAE	LATE GOLDENROD	naturalized	
Solidago confinis A. Gray	ASTERACEAE	SOUTHERN GOLDENROD	native	
Solidago elongata Nutt.	ASTERACEAE	WEST COAST CANADA GOLDENROD	native	
Solidago guiradonis A. Gray	ASTERACEAE	GUIRADO'S GOLDENROD	native	
Solidago lepida DC. var. salebrosa (Piper) Semple	ASTERACEAE	WESTERN GOLDENROD	native	
Solidago multiradiata Aiton	ASTERACEAE	NORTHERN GOLDENROD	native	
Solidago spathulata DC.	ASTERACEAE	COAST GOLDENROD	native	
Solidago spectabilis (D. C. Eaton) A. Gray	ASTERACEAE	SHOWY GOLDENROD	native	
Solidago velutina DC.	ASTERACEAE	VELVETY GOLDENROD	native	
Solidago velutina DC. subsp. californica (Nutt.) Semple	ASTERACEAE	CALIFORNIA GOLDENROD	native	
Solidago velutina DC. subsp. sparsiflora (A. Gray) Semple	ASTERACEAE		native	
Soliva sessilis Ruiz & Pav.	ASTERACEAE		naturalized	
Sonchus arvensis L.	ASTERACEAE	PERENNIAL SOW THISTLE	naturalized	
Sonchus arvensis L. subsp. uliginosus (M. Bieb.) Nyman	ASTERACEAE		naturalized	
Sonchus asper (L.) Hill	ASTERACEAE		naturalized	
Sonchus asper (L.) Hill subsp. asper	ASTERACEAE	PRICKLY SOW THISTLE	naturalized	
Sonchus oleraceus L.	ASTERACEAE	COMMON SOW THISTLE	naturalized	
Sonchus tenerrimus L.	ASTERACEAE		naturalized	
Sorbus californica Greene	ROSACEAE	CALIFORNIA MOUNTAIN ASH	native	
Sorbus scopulina Greene	ROSACEAE	CASCADE MOUNTAIN ASH	native	
Sorbus sitchensis M. Roem.	ROSACEAE		native	
Sorbus sitchensis M. Roem. var. grayi (Wenz.) C. L. Hitchc.	ROSACEAE	GRAY'S MOUNTAIN ASH	native	
Sorbus sitchensis M. Roem. var. sitchensis	ROSACEAE	SITKA MOUNTAIN ASH	native	
Sorghum bicolor (L.) Moench	POACEAE	SORGHUM	naturalized	
Sorghum halepense (L.) Pers.	POACEAE	JOHNSON GRASS	naturalized	
Sparganium angustifolium Michx.	TYPHACEAE	NARROW-LEAVED BUR-REED	native	
Sparganium emersum Rehmann	TYPHACEAE		native	
Sparganium eurycarpum Engelm. ex A. Gray	TYPHACEAE		native	
Sparganium eurycarpum Engelm. ex A. Gray var. eurycarpum	TYPHACEAE		native	
Sparganium eurycarpum Engelm. ex A. Gray var. greenei (Morong) Graebn.	TYPHACEAE		native	
Sparganium natans L.	TYPHACEAE	SMALL BUR-REED	native	
Spartina alterniflora Loisel.	POACEAE	SALT-WATER CORD GRASS	naturalized	
Spartina densiflora Brongn.	POACEAE	DENSE-FLOWERED CORD GRASS	naturalized	
Spartina foliosa Trin.	POACEAE	CALIFORNIA CORD GRASS	native	
Spartina gracilis Trin.	POACEAE	ALKALI CORD GRASS	native	
Spartina patens (Aiton) Muhl.	POACEAE	SALT-MEADOW CORD GRASS	naturalized	
Spartium junceum L.	FABACEAE	SPANISH BROOM	naturalized	
Spergula arvensis L.	CARYOPHYLLACEAE	STARWORT	naturalized	
Spergularia atrosperma R. Rossbach	CARYOPHYLLACEAE	BLACK SEED SAND-SPURREY	native	
Spergularia bocconi (Scheele) Graebn.	CARYOPHYLLACEAE	BOCCONE'S SAND-SPURREY	naturalized	
Spergularia canadensis (Pers.) G. Don	CARYOPHYLLACEAE		native	
Spergularia canadensis (Pers.) G. Don var. occidentalis R. Rossbach	CARYOPHYLLACEAE	WESTERN SAND-SPURREY	native	
Spergularia macrotheca (Hornem. ex Cham. & Schltdl.) Heynh.	CARYOPHYLLACEAE	STICKY SAND-SPURREY	native	
Spergularia macrotheca (Hornem. ex Cham. & Schltdl.) Heynh. var. leucantha (Greene) B. L. Rob.	CARYOPHYLLACEAE		native	
Spergularia macrotheca (Hornem. ex Cham. & Schltdl.) Heynh. var. longistyla R. Rossbach	CARYOPHYLLACEAE		native	
Spergularia macrotheca (Hornem. ex Cham. & Schltdl.) Heynh. var. macrotheca	CARYOPHYLLACEAE		native	
Spergularia marina (L.) Besser	CARYOPHYLLACEAE	SALTMARSH SAND-SPURREY	native	
Spergularia media (L.) C. Presl	CARYOPHYLLACEAE		naturalized	
Spergularia media (L.) C. Presl var. media	CARYOPHYLLACEAE	GREATER SEA-SPURREY	naturalized	
Spergularia platensis (Cambess.) Fenzl	CARYOPHYLLACEAE		naturalized	
Spergularia platensis (Cambess.) Fenzl var. platensis	CARYOPHYLLACEAE	LA PLATA SAND-SPURREY	naturalized	
Spergularia rubra (L.) J. Presl & C. Presl	CARYOPHYLLACEAE	RED SAND-SPURREY	naturalized	
Spergularia villosa (Pers.) Cambess.	CARYOPHYLLACEAE	HAIRY SAND-SPURREY	naturalized	
Spermolepis echinata (DC.) A. Heller	APIACEAE	BRISTLY SCALESEED	native	
Sphaeralcea ambigua A. Gray	MALVACEAE		native	
Sphaeralcea ambigua A. Gray var. ambigua	MALVACEAE	APRICOT MALLOW	native	
Sphaeralcea ambigua A. Gray var. rosacea (Munz & I. M. Johnst.) Kearney	MALVACEAE	PARISH MALLOW	native	
Sphaeralcea ambigua A. Gray var. rugosa (Kearney) Kearney	MALVACEAE	ROUGHLEAF APRICOT MALLOW	native	
Sphaeralcea angustifolia (Cav.) G. Don	MALVACEAE	NARROW-LEAVED GLOBEMALLOW	native	
Sphaeralcea coulteri (S. Watson) A. Gray	MALVACEAE	COULTER'S GLOBEMALLOW	native	
Sphaeralcea emoryi Torr. ex A. Gray	MALVACEAE		native	
Sphaeralcea emoryi Torr. ex A. Gray var. emoryi	MALVACEAE	EMORY'S GLOBEMALLOW	native	
Sphaeralcea grossulariifolia (Hook. & Arn.) Rydb.	MALVACEAE	GOOSEBERRY-LEAVED GLOBEMALLOW	native	
Sphaeralcea munroana (Douglas ex Lindl.) Spach ex A. Gray	MALVACEAE	MUNRO'S DESERT-MALLOW	native	
Sphaeralcea orcuttii Rose	MALVACEAE	CARRIZO MALLOW	native	
Sphaeralcea rusbyi A. Gray	MALVACEAE		native	
Sphaeralcea rusbyi A. Gray var. eremicola (Jeps.) Kearney	MALVACEAE	RUSBY'S DESERT-MALLOW	native	
Sphaeromeria cana (D. C. Eaton) A. Heller	ASTERACEAE	GRAY CHICKENSAGE	native	
Sphaeromeria potentilloides (A. Gray) A. Heller	ASTERACEAE	FIVEFINGER CHICKENSAGE	native	
Sphaeromeria potentilloides (A. Gray) A. Heller var. nitrophila (Cronquist) A. H. Holmgren, L. Schultz, & T. Lowrey	ASTERACEAE	ALKALI TANSY-SAGE	native	
Sphaeromeria potentilloides (A. Gray) A. Heller var. potentilloides	ASTERACEAE		native	
Sphenopholis obtusata (Michx.) Scribn.	POACEAE	PRAIRIE WEDGE GRASS	native	
Sphenosciadium capitellatum A. Gray	APIACEAE	RANGER'S BUTTONS	native	
Spinacia oleracea L.	CHENOPODIACEAE		naturalized	acceptance uncertain
Spiraea douglasii Hook.	ROSACEAE		native	
Spiraea splendens Baumann ex K. Koch	ROSACEAE		native	
Spiranthes porrifolia Lindl.	ORCHIDACEAE		native	
Spiranthes romanzoffiana Cham.	ORCHIDACEAE		native	
Spirodela polyrhiza (L.) Schleid.	ARACEAE		native	
Sporobolus airoides (Torr.) Torr.	POACEAE	ALKALI SACATON	native	
Sporobolus contractus Hitchc.	POACEAE	SPIKE DROPSEED	native	
Sporobolus cryptandrus (Torr.) A. Gray	POACEAE	SAND DROPSEED	native	
Sporobolus flexuosus (Thurb. ex Vasey) Rydb.	POACEAE	MESA DROPSEED	native	
Sporobolus indicus (L.) R. Br.	POACEAE	SMUT GRASS	naturalized	
Sporobolus vaginiflorus (Torr. ex A. Gray) Alph. Wood	POACEAE	POVERTY DROPSEED	naturalized	
Sporobolus wrightii Munro ex Scribn.	POACEAE	BIG SACATON	native	
Stachys ajugoides Benth.	LAMIACEAE		native	
Stachys albens A. Gray	LAMIACEAE		native	
Stachys bergii G. A. Mulligan & D. B. Munro	LAMIACEAE		native	
Stachys bullata Benth.	LAMIACEAE		native	
Stachys chamissonis Benth.	LAMIACEAE		native	
Stachys mexicana Benth.	LAMIACEAE		native	
Stachys pilosa Nutt.	LAMIACEAE	PRAIRIE WOUNDWORT	native	
Stachys pycnantha Benth.	LAMIACEAE	SHORT-SPIKED HEDGE NETTLE	native	
Stachys rigida Nutt. ex Benth.	LAMIACEAE		native	
Stachys rigida Nutt. ex Benth. var. quercetorum (A. Heller) Epling ex Munz	LAMIACEAE		native	
Stachys rigida Nutt. ex Benth. var. rigida	LAMIACEAE		native	
Stachys stebbinsii G. A. Mulligan & D. B. Munro	LAMIACEAE		native	
Stachys stricta Greene	LAMIACEAE		native	
Stanleya elata M. E. Jones	BRASSICACEAE		native	
Stanleya pinnata (Pursh) Britton	BRASSICACEAE		native	
Stanleya pinnata (Pursh) Britton var. pinnata	BRASSICACEAE		native	
Stanleya viridiflora Nutt.	BRASSICACEAE	GREEN-FLOWERED PRINCE'S PLUME	native	
Staphylea bolanderi A. Gray	STAPHYLEACEAE	SIERRA BLADDERNUT	native	
Stebbinsoseris decipiens (K. L. Chambers) K. L. Chambers	ASTERACEAE	SANTA CRUZ MICROSERIS	native	
Stebbinsoseris heterocarpa (Nutt.) K. L. Chambers	ASTERACEAE	GRASSLAND SILVERPUFFS	native	
Stellaria borealis Bigelow	CARYOPHYLLACEAE		native	
Stellaria borealis Bigelow subsp. sitchana (Steud.) Piper & Beattie	CARYOPHYLLACEAE	SITKA STARWORT	native	
Stellaria calycantha (Ledeb.) Bong.	CARYOPHYLLACEAE	NORTHERN STARWORT	native	
Stellaria crispa Cham. & Schltdl.	CARYOPHYLLACEAE	CRISP STARWORT	native	
Stellaria graminea L.	CARYOPHYLLACEAE	COMMON STARWORT	naturalized	
Stellaria littoralis Torr.	CARYOPHYLLACEAE	BEACH STARWORT	native	
Stellaria longifolia Muhl. ex Willd.	CARYOPHYLLACEAE	LONG-LEAVED STARWORT	native	
Stellaria longipes Goldie	CARYOPHYLLACEAE		native	
Stellaria longipes Goldie subsp. longipes	CARYOPHYLLACEAE	GOLDIE'S STARWORT	native	
Stellaria media (L.) Vill.	CARYOPHYLLACEAE	COMMON CHICKWEED	naturalized	
Stellaria neglecta Weihe	CARYOPHYLLACEAE	GREATER CHICKWEED	naturalized	
Stellaria nitens Nutt.	CARYOPHYLLACEAE	SHINING CHICKWEED	native	
Stellaria obtusa Engelm.	CARYOPHYLLACEAE	ROCKY MOUNTAIN STARWORT	native	
Stellaria pallida (Dumort.) Crép.	CARYOPHYLLACEAE	LESSER CHICKWEED	naturalized	
Stellaria umbellata Turcz. ex Kar. & Kir.	CARYOPHYLLACEAE	UMBELLATE STARWORT	native	
Stemodia durantifolia (L.) Sw.	PLANTAGINACEAE	PURPLE STEMODIA	native	
Stenanthium occidentale A. Gray	MELANTHIACEAE		native	
Stenotaphrum secundatum (Walter) Kuntze	POACEAE	SAINT AUGUSTINE GRASS	naturalized	
Stenotus acaulis (Nutt.) Nutt.	ASTERACEAE	STEMLESS GOLDENWEED	native	
Stenotus lanuginosus (A. Gray) Greene	ASTERACEAE		native	
Stenotus lanuginosus (A. Gray) Greene var. lanuginosus	ASTERACEAE	WOOLLY STENOTUS	native	
Stephanomeria cichoriacea A. Gray	ASTERACEAE	CHICORYLEAF WIRE-LETTUCE	native	
Stephanomeria diegensis Gottlieb	ASTERACEAE		native	
Stephanomeria elata Nutt.	ASTERACEAE		native	
Stephanomeria exigua Nutt.	ASTERACEAE		native	
Stephanomeria exigua Nutt. subsp. carotifera (Hoover) Gottlieb	ASTERACEAE		native	
Stephanomeria exigua Nutt. subsp. coronaria (Greene) Gottlieb	ASTERACEAE		native	
Stephanomeria exigua Nutt. subsp. deanei (J. F. Macbr.) Gottlieb	ASTERACEAE		native	
Stephanomeria exigua Nutt. subsp. exigua	ASTERACEAE		native	
Stephanomeria exigua Nutt. subsp. macrocarpa Gottlieb	ASTERACEAE		native	
Stephanomeria lactucina A. Gray	ASTERACEAE		native	
Stephanomeria paniculata Nutt.	ASTERACEAE		native	
Stephanomeria parryi A. Gray	ASTERACEAE		native	
Stephanomeria pauciflora (Torr.) A. Nelson	ASTERACEAE	WIRE-LETTUCE	native	
Stephanomeria tenuifolia (Raf.) H. M. Hall	ASTERACEAE	NARROW-LEAVED WIRE-LETTUCE	native	
Stephanomeria virgata Benth.	ASTERACEAE		native	
Stephanomeria virgata Benth. subsp. pleurocarpa (Greene) Gottlieb	ASTERACEAE		native	
Stephanomeria virgata Benth. subsp. virgata	ASTERACEAE		native	
Stillingia linearifolia S. Watson	EUPHORBIACEAE		native	
Stillingia paucidentata S. Watson	EUPHORBIACEAE		native	
Stillingia spinulosa Torr.	EUPHORBIACEAE		native	
Stipa arida M.E. Jones	POACEAE	MORMON NEEDLE GRASS	native	
Stipa brachychaeta Godr.	POACEAE	PUNA NEEDLE GRASS	naturalized	
Stipa capensis Thunb.	POACEAE	CAPE RICE GRASS	naturalized	
Stipa cernua Stebbins & Love	POACEAE	NODDING NEEDLE GRASS	native	
Stipa chaetophora (Griseb.) Columbus & J.P. Sm.	POACEAE	STIPOID RICE GRASS	naturalized	
Stipa comata Trin. & Rupr.	POACEAE	NEEDLE-AND-THREAD	native	
Stipa comata Trin. & Rupr. var. comata	POACEAE		native	
Stipa comata Trin. & Rupr. var. intermedia Scribn. & Tweedy	POACEAE		native	
Stipa coronata Thurb.	POACEAE	CRESTED NEEDLE GRASS	native	
Stipa diegoensis Swallen	POACEAE	SAN DIEGO NEEDLE GRASS	native	
Stipa divaricata Columbus & J.P. Sm.	POACEAE	SMALL-FLOWERED RICE GRASS	native	
Stipa exigua (Thurb.) Columbus & J.P. Sm.	POACEAE	LITTLE RICE GRASS	native	
Stipa hymenoides Roem. & Schult.	POACEAE	SAND RICE GRASS	native	
Stipa kingii Bol.	POACEAE	KING'S RICE GRASS	native	
Stipa latiglumis Swallen	POACEAE	WIDE-GLUMED NEEDLE GRASS	native	
Stipa lemmonii (Vasey) Scribn.	POACEAE	LEMMON'S NEEDLE GRASS	native	
Stipa lemmonii (Vasey) Scribn. var. lemmonii	POACEAE		native	
Stipa lemmonii (Vasey) Scribn. var. pubescens Crampton	POACEAE		native	
Stipa lepida Hitchc.	POACEAE	FOOTHILL NEEDLE GRASS	native	
Stipa lettermanii Vasey	POACEAE	LETTERMAN'S NEEDLE GRASS	native	
Stipa manicata E. Desv.	POACEAE	ANDEAN TUSSOCK GRASS	naturalized	
Stipa mauritanica (Poir.) Columbus & J.P. Sm.	POACEAE	MAURITANIAN GRASS	naturalized	
Stipa miliacea (L.) Hoover	POACEAE		naturalized	
Stipa miliacea (L.) Hoover var. miliacea	POACEAE	SMILO GRASS	naturalized	
Stipa nelsonii Scribn. var. dorei (Barkworth & J.R. Maze) Dorn	POACEAE	MOUNTAIN NEEDLE GRASS	native	
Stipa nevadensis B.L. Johnson	POACEAE	NEVADA NEEDLE GRASS	native	
Stipa occidentalis Thurb. ex S. Watson	POACEAE		native	
Stipa occidentalis Thurb. ex S. Watson var. californica (Merr. & Burtt Davy) C.L. Hitchc.	POACEAE	CALIFORNIA NEEDLE GRASS	native	
Stipa occidentalis Thurb. ex S. Watson var. occidentalis	POACEAE	WESTERN NEEDLE GRASS	native	
Stipa occidentalis Thurb. ex S. Watson var. pubescens (Vasey) J.R. Maze, Roy L. Taylor & MacBryde	POACEAE	COMMON WESTERN NEEDLE GRASS	native	
Stipa parishii Vasey	POACEAE		native	
Stipa parishii Vasey var. parishii	POACEAE		native	
Stipa pinetorum M.E. Jones	POACEAE	PINEWOODS NEEDLE GRASS	native	
Stipa pulchra Hitchc.	POACEAE	PURPLE NEEDLE GRASS	native	
Stipa purpurata Columbus & J.P. Sm.	POACEAE	BRISTLY NEEDLE GRASS	naturalized	
Stipa speciosa Trin. & Rupr.	POACEAE	DESERT NEEDLE GRASS	native	
Stipa stillmanii Bol.	POACEAE	STILLMAN'S NEEDLE GRASS	native	
Stipa thurberiana Piper	POACEAE	THURBER'S NEEDLE GRASS	native	
Stipa webberi (Thurb.) B.L. Johnson	POACEAE	WEBBER'S NEEDLE GRASS	native	
Streptanthella longirostris (S. Watson) Rydb.	BRASSICACEAE		native	
Streptanthus barbatus S. Watson	BRASSICACEAE		native	
Streptanthus barbiger Greene	BRASSICACEAE	BEARDED JEWELFLOWER	native	
Streptanthus batrachopus J. L. Morrison	BRASSICACEAE	TAMALPAIS JEWELFLOWER	native	
Streptanthus bernardinus (Greene) Parish	BRASSICACEAE	LAGUNA MOUNTAINS JEWELFLOWER	native	
Streptanthus brachiatus F. W. Hoffm.	BRASSICACEAE		native	
Streptanthus breweri A. Gray	BRASSICACEAE		native	
Streptanthus callistus J. L. Morrison	BRASSICACEAE	MOUNT HAMILTON JEWELFLOWER	native	
Streptanthus campestris S. Watson	BRASSICACEAE	SOUTHERN JEWELFLOWER	native	
Streptanthus cordatus Nutt.	BRASSICACEAE		native	
Streptanthus cordatus Nutt. var. cordatus	BRASSICACEAE		native	
Streptanthus cordatus Nutt. var. piutensis J. T. Howell	BRASSICACEAE	PIUTE MOUNTAINS JEWELFLOWER	native	
Streptanthus diversifolius S. Watson	BRASSICACEAE	VARIED-LEAVED JEWELFLOWER	native	
Streptanthus drepanoides Kruckeb. & J. L. Morrison	BRASSICACEAE	SICKLE-FRUIT JEWELFLOWER	native	
Streptanthus farnsworthianus J. T. Howell	BRASSICACEAE	FARNSWORTH'S JEWELFLOWER	native	
Streptanthus fenestratus (Greene) J. T. Howell	BRASSICACEAE	TEHIPITE VALLEY JEWELFLOWER	native	
Streptanthus glandulosus Hook.	BRASSICACEAE		native	
Streptanthus glandulosus Hook. subsp. albidus (Greene) Al-Shehbaz, M.S. Mayer & D.W. Taylor	BRASSICACEAE	METCALF CANYON JEWELFLOWER	native	
Streptanthus glandulosus Hook. subsp. glandulosus	BRASSICACEAE		native	
Streptanthus glandulosus Hook. subsp. hoffmanii (Kruckeb.) M.S. Mayer & D.W. Taylor	BRASSICACEAE	HOFFMAN'S BRISTLY JEWELFLOWER	native	
Streptanthus glandulosus Hook. subsp. niger (Greene) Al-Shehbaz, M.S. Mayer & D.W. Taylor	BRASSICACEAE	TIBURON JEWELFLOWER	native	
Streptanthus glandulosus Hook. subsp. pulchellus (Greene) Kruckeb.	BRASSICACEAE	MOUNT TAMALPAIS BRISTLY JEWELFLOWER	native	
Streptanthus glandulosus Hook. subsp. secundus (Greene) Kruckeb.	BRASSICACEAE		native	
Streptanthus glandulosus Hook. subsp. sonomensis (Kruckeb.) M.S. Mayer & D.W. Taylor	BRASSICACEAE	UNCOMMON JEWELFLOWER	native	
Streptanthus gracilis Eastw.	BRASSICACEAE	ALPINE JEWELFLOWER	native	
Streptanthus hesperidis Jeps.	BRASSICACEAE		native	
Streptanthus hispidus A. Gray	BRASSICACEAE	MOUNT DIABLO JEWELFLOWER	native	
Streptanthus howellii S. Watson	BRASSICACEAE	HOWELL'S JEWELFLOWER	native	
Streptanthus insignis Jeps.	BRASSICACEAE	SAN BENITO JEWELFLOWER	native	
Streptanthus insignis Jeps. subsp. insignis	BRASSICACEAE		native	
Streptanthus insignis Jeps. subsp. lyonii Kruckeb. & J. L. Morrison	BRASSICACEAE	ARBURUA RANCH JEWELFLOWER	native	
Streptanthus longisiliquus G. Clifton & R. E. Buck	BRASSICACEAE	LONG-FRUIT JEWELFLOWER	native	
Streptanthus morrisonii F. W. Hoffm.	BRASSICACEAE		native	
Streptanthus niger Greene	BRASSICACEAE		native	
Streptanthus oblanceolatus T.W. Nelson & J.P. Nelson	BRASSICACEAE	TRINITY RIVER JEWELFLOWER	native	
Streptanthus oliganthus Rollins	BRASSICACEAE	MASONIC MOUNTAIN JEWELFLOWER	native	
Streptanthus polygaloides A. Gray	BRASSICACEAE	MILKWORT JEWELFLOWER	native	
Streptanthus tortuosus Kellogg	BRASSICACEAE	MOUNTAIN JEWELFLOWER	native	
Streptanthus vernalis R. O'Donnell & R. W. Dolan	BRASSICACEAE	EARLY JEWELFLOWER	native	
Streptanthus vimineus (Greene) Al-Shehbaz & D.W. Taylor	BRASSICACEAE		native	
Streptopus amplexifolius (L.) DC.	LILIACEAE		native	
Streptopus amplexifolius (L.) DC. var. americanus Schult. & Schult. f.	LILIACEAE		native	
Strigosella africana (L.) Botsch.	BRASSICACEAE		naturalized	
Stuckenia filiformis (Pers.) Börner	POTAMOGETONACEAE		native	
Stuckenia filiformis (Pers.) Börner subsp. alpina (Blytt) R. R. Haynes, Les, & M. Král	POTAMOGETONACEAE	SLENDER-LEAVED PONDWEED	native	
Stuckenia pectinata (L.) Börner	POTAMOGETONACEAE	FENNEL-LEAF PONDWEED	native	
Stuckenia striata (Ruiz & Pav.) Holub	POTAMOGETONACEAE	NEVADA PONDWEED	native	
Stutzia covillei (Standl.) E.H. Zacharias	CHENOPODIACEAE		native	
Stylocline citroleum Morefield	ASTERACEAE	OIL NESTSTRAW	native	
Stylocline gnaphaloides Nutt.	ASTERACEAE	EVERLASTING NESTSTRAW	native	
Stylocline intertexta Morefield	ASTERACEAE	MOJAVE NESTSTRAW	native	
Stylocline masonii Morefield	ASTERACEAE	MASON'S NESTSTRAW	native	
Stylocline micropoides A. Gray	ASTERACEAE	WOOLLYHEAD FANBRACT	native	
Stylocline psilocarphoides M. Peck	ASTERACEAE	PECK NESTSTRAW	native	
Stylocline sonorensis Wiggins	ASTERACEAE	MESQUITE NESTSTRAW	native	
Styrax redivivus (Torr.) L. C. Wheeler	STYRACACEAE		native	
Suaeda calceoliformis (Hook.) Moquin	CHENOPODIACEAE	HORNED SEABLITE	native	
Suaeda californica S. Watson	CHENOPODIACEAE	CALIFORNIA SEABLITE	native	
Suaeda esteroa Ferren & S. A. Whitmore	CHENOPODIACEAE	ESTUARY SEABLITE	native	
Suaeda nigra (Raf.) J. F. Macbr.	CHENOPODIACEAE	BUSH SEEPWEED	native	
Suaeda occidentalis S. Watson	CHENOPODIACEAE	WESTERN SEABLITE	native	
Suaeda taxifolia (Standl.) Standl.	CHENOPODIACEAE	WOOLLY SEABLITE	native	
Subularia aquatica L.	BRASSICACEAE		native	
Subularia aquatica L. subsp. americana G. A. Mulligan & Calder	BRASSICACEAE	WATER AWLWORT	native	
Swallenia alexandrae (Swallen) Soderstr. & H. F. Decker	POACEAE	EUREKA VALLEY DUNE GRASS	native	
Swertia perennis L.	GENTIANACEAE	STAR SWERTIA	native	
Symphoricarpos albus (L.) S. F. Blake	CAPRIFOLIACEAE		native	
Symphoricarpos albus (L.) S. F. Blake var. laevigatus (Fernald) S. F. Blake	CAPRIFOLIACEAE	SNOWBERRY	native	
Symphoricarpos longiflorus A. Gray	CAPRIFOLIACEAE	FRAGRANT SNOWBERRY	native	
Symphoricarpos mollis Nutt.	CAPRIFOLIACEAE	TRIP VINE	native	
Symphoricarpos rotundifolius A. Gray	CAPRIFOLIACEAE		native	
Symphoricarpos rotundifolius A. Gray var. parishii (Rydb.) Dempster	CAPRIFOLIACEAE		native	
Symphoricarpos rotundifolius A. Gray var. rotundifolius	CAPRIFOLIACEAE		native	
Symphyotrichum ascendens (Lindl.) G. L. Nesom	ASTERACEAE		native	
Symphyotrichum bracteolatum (Nutt.) G.L. Nesom	ASTERACEAE		native	
Symphyotrichum campestre (Nutt.) G. L. Nesom	ASTERACEAE		native	
Symphyotrichum chilense (Nees) G. L. Nesom	ASTERACEAE		native	
Symphyotrichum defoliatum (Parish) G. L. Nesom	ASTERACEAE	SAN BERNARDINO ASTER	native	
Symphyotrichum foliaceum (Lindl. ex DC.) G. L. Nesom	ASTERACEAE		native	
Symphyotrichum foliaceum (Lindl. ex DC.) G. L. Nesom var. apricum (A. Gray) G. L. Nesom	ASTERACEAE		native	
Symphyotrichum foliaceum (Lindl. ex DC.) G. L. Nesom var. parryi (D. C. Eaton) G. L. Nesom	ASTERACEAE		native	
Symphyotrichum frondosum (Nutt.) G. L. Nesom	ASTERACEAE		native	
Symphyotrichum greatae (Parish) G. L. Nesom	ASTERACEAE	GREATA'S ASTER	native	
Symphyotrichum lanceolatum (Willd.) G. L. Nesom	ASTERACEAE		native	
Symphyotrichum lanceolatum (Willd.) G. L. Nesom var. hesperium (A. Gray) G. L. Nesom	ASTERACEAE		native	
Symphyotrichum lentum (Greene) G. L. Nesom	ASTERACEAE	SUISUN MARSH ASTER	native	
Symphyotrichum spathulatum (Lindl.) G. L. Nesom	ASTERACEAE		native	
Symphyotrichum spathulatum (Lindl.) G. L. Nesom var. intermedium (A. Gray) G. L. Nesom	ASTERACEAE		native	
Symphyotrichum spathulatum (Lindl.) G. L. Nesom var. spathulatum	ASTERACEAE		native	
Symphyotrichum spathulatum (Lindl.) G. L. Nesom var. yosemitanum (A. Gray) G. L. Nesom	ASTERACEAE	WESTERN BOG ASTER	native	
Symphyotrichum subspicatum (Nees) G. L. Nesom	ASTERACEAE	DOUGLAS ASTER	native	
Symphyotrichum subulatum (Michx.) G. L. Nesom	ASTERACEAE	ANNUAL SALTMARSH ASTER	native	
Symphyotrichum subulatum (Michx.) G. L. Nesom var. elongatum (A.G. Jones & Lowry) S.D. Sundb.	ASTERACEAE		naturalized	
Symphyotrichum subulatum (Michx.) G. L. Nesom var. parviflorum (Nees) S. D. Sundb.	ASTERACEAE		native	
Symphyotrichum subulatum (Michx.) G. L. Nesom var. squamatum (Spreng.) S.D. Sundb.	ASTERACEAE		naturalized	
Symphytum X uplandicum Nyman	BORAGINACEAE	RUSSIAN COMFREY	naturalized	
Synthyris cordata (A. Gray) A. Heller	PLANTAGINACEAE	SERPENTINE SNOW QUEEN	native	
Synthyris missurica (Raf.) Pennell	PLANTAGINACEAE		native	
Synthyris missurica (Raf.) Pennell subsp. missurica	PLANTAGINACEAE	KITTENTAIL	native	
Synthyris reniformis (Douglas ex Benth.) Benth.	PLANTAGINACEAE	SNOW QUEEN	native	
Syntrichopappus fremontii A. Gray	ASTERACEAE		native	
Syntrichopappus lemmonii (A. Gray) A. Gray	ASTERACEAE	LEMMON'S SYNTRICHOPAPPUS	native	
Systenotheca vortriedei (Brandegee) Reveal & Hardham	POLYGONACEAE	VORTRIEDE'S SPINEFLOWER	native	
Tagetes minuta L.	ASTERACEAE	WILD MARIGOLD	naturalized	
Tamarix aphylla (L.) H. Karst.	TAMARICACEAE	ATHEL	naturalized	
Tamarix chinensis Lour.	TAMARICACEAE	FIVESTAMEN TAMARISK	naturalized	
Tamarix gallica L.	TAMARICACEAE	FRENCH TAMARISK	naturalized	
Tamarix parviflora DC.	TAMARICACEAE	SMALLFLOWER TAMARISK	naturalized	
Tamarix ramosissima Ledeb.	TAMARICACEAE	SALTCEDAR	naturalized	
Tanacetum bipinnatum (L.) Sch. Bip.	ASTERACEAE	DUNE TANSY	native	
Tanacetum parthenium (L.) Sch. Bip.	ASTERACEAE	FEVERFEW	naturalized	
Tanacetum vulgare L.	ASTERACEAE	COMMON TANSY	naturalized	
Taraxacum californicum Munz & I. M. Johnst.	ASTERACEAE	CALIFORNIA DANDELION	native	
Taraxacum ceratophorum (Ledeb.) DC.	ASTERACEAE	HORNED DANDELION	native	
Taraxacum erythrospermum Besser	ASTERACEAE	RED-SEEDED DANDELION	naturalized	
Taraxacum officinale F. H. Wigg.	ASTERACEAE	COMMON DANDELION	naturalized	
Taraxia ovata (Nutt.) Small	ONAGRACEAE		native	
Taraxia subacaulis (Pursh) Rydb.	ONAGRACEAE		native	
Taraxia tanacetifolia (Torr. & A. Gray) Piper	ONAGRACEAE		native	
Tauschia arguta (Torr. & A. Gray) J. F. Macbr.	APIACEAE		native	
Tauschia glauca (J. M. Coult. & Rose) Mathias & Constance	APIACEAE	GLAUCOUS TAUSCHIA	native	
Tauschia hartwegii (A. Gray) J. F. Macbr.	APIACEAE		native	
Tauschia howellii (J. M. Coult. & Rose) J. F. Macbr.	APIACEAE	HOWELL'S TAUSCHIA	native	
Tauschia kelloggii (A. Gray) J. F. Macbr.	APIACEAE		native	
Tauschia parishii (J. M. Coult. & Rose) J. F. Macbr.	APIACEAE		native	
Taxus brevifolia Nutt.	TAXACEAE	PACIFIC YEW	native	
Tellima grandiflora (Pursh) Douglas ex Lindl.	SAXIFRAGACEAE		native	
Tetracoccus dioicus Parry	PICRODENDRACEAE	PARRY'S TETRACOCCUS	native	
Tetracoccus hallii Brandegee	PICRODENDRACEAE	HALL'S TETRACOCCUS	native	
Tetracoccus ilicifolius Coville & Gilman	PICRODENDRACEAE	HOLLY-LEAVED TETRACOCCUS	native	
Tetradymia argyraea Munz & Roos	ASTERACEAE	STRIPED HORSEBRUSH	native	
Tetradymia axillaris A. Nelson	ASTERACEAE		native	
Tetradymia axillaris A. Nelson var. axillaris	ASTERACEAE		native	
Tetradymia axillaris A. Nelson var. longispina (M. E. Jones) Strother	ASTERACEAE		native	
Tetradymia canescens DC.	ASTERACEAE		native	
Tetradymia comosa A. Gray	ASTERACEAE		native	
Tetradymia glabrata Torr. & A. Gray	ASTERACEAE		native	
Tetradymia spinosa Hook. & Arn.	ASTERACEAE		native	
Tetradymia stenolepis Greene	ASTERACEAE		native	
Tetradymia tetrameres (S. F. Blake) Strother	ASTERACEAE	DUNE HORSEBRUSH	native	
Tetragonia tetragonioides (Pall.) Kuntze	AIZOACEAE	NEW ZEALAND SPINACH	naturalized	
Tetraneuris acaulis (Pursh) Greene	ASTERACEAE		native	
Tetraneuris acaulis (Pursh) Greene var. arizonica (Greene) K. L. Parker	ASTERACEAE		native	
Tetrapteron graciliflorum (Hook. & Arn.) W.L. Wagner & Hoch	ONAGRACEAE	HILL SUN CUP	native	
Tetrapteron palmeri (S. Watson) W.L. Wagner & Hoch	ONAGRACEAE		native	
Teucrium cubense Jacq.	LAMIACEAE		native	
Teucrium cubense Jacq. subsp. depressum (Small) E. M. McClint. & Epling	LAMIACEAE	DWARF GERMANDER	native	
Teucrium glandulosum Kellogg	LAMIACEAE	DESERT GERMANDER	native	
Thalictrum alpinum L.	RANUNCULACEAE	ARCTIC MEADOW-RUE	native	
Thalictrum fendleri Engelm. ex A. Gray	RANUNCULACEAE		native	
Thalictrum fendleri Engelm. ex A. Gray var. fendleri	RANUNCULACEAE		native	
Thalictrum fendleri Engelm. ex A. Gray var. polycarpum Torr.	RANUNCULACEAE		native	
Thalictrum occidentale A. Gray	RANUNCULACEAE		native	
Thalictrum sparsiflorum Turcz. ex Fisch. & C. A. Mey.	RANUNCULACEAE		native	
Thamnosma montana Torr. & Frém.	RUTACEAE		native	
Thelypodium brachycarpum Torr.	BRASSICACEAE	SHORT-PODDED THELYPODIUM	native	
Thelypodium crispum Payson	BRASSICACEAE		native	
Thelypodium flexuosum B. L. Rob.	BRASSICACEAE		native	
Thelypodium howellii S. Watson	BRASSICACEAE		native	
Thelypodium howellii S. Watson subsp. howellii	BRASSICACEAE	HOWELL'S THELYPODIUM	native	
Thelypodium integrifolium (Nutt.) Endl. ex Walp.	BRASSICACEAE		native	
Thelypodium integrifolium (Nutt.) Endl. ex Walp. subsp. affine (Greene) Al-Shehbaz	BRASSICACEAE		native	
Thelypodium integrifolium (Nutt.) Endl. ex Walp. subsp. complanatum Al-Shehbaz	BRASSICACEAE	FOXTAIL THELYPODIUM	native	
Thelypodium laciniatum (Hook.) Endl. ex Walp.	BRASSICACEAE		native	
Thelypodium milleflorum A. Nelson	BRASSICACEAE	MANY-FLOWERED THELYPODIUM	native	
Thelypodium stenopetalum S. Watson	BRASSICACEAE	SLENDER-PETALED THELYPODIUM	native	
Thelypteris nevadensis (Baker) C. V. Morton	THELYPTERIDACEAE	NEVADA MARSH FERN	native	
Thelypteris puberula (Baker) C. V. Morton	THELYPTERIDACEAE		native	
Thelypteris puberula (Baker) C. V. Morton var. sonorensis A. R. Sm.	THELYPTERIDACEAE	SONORAN MAIDEN FERN	native	
Thermopsis californica S. Watson	FABACEAE		native	
Thermopsis californica S. Watson var. argentata (Greene) C. J. Chen & B. L. Turner	FABACEAE	SILVERY FALSE-LUPINE	native	
Thermopsis californica S. Watson var. californica	FABACEAE		native	
Thermopsis californica S. Watson var. semota (Jeps.) C. J. Chen & B. L. Turner	FABACEAE	VELVETY FALSE-LUPINE	native	
Thermopsis gracilis Howell	FABACEAE		native	
Thermopsis macrophylla Hook. & Arn.	FABACEAE	SANTA YNEZ FALSE-LUPINE	native	
Thermopsis robusta Howell	FABACEAE	ROBUST FALSE-LUPINE	native	
Thlaspi arvense L.	BRASSICACEAE		naturalized	
Thuja plicata Donn ex D. Don	CUPRESSACEAE	CANOE CEDAR	native	
Thymophylla pentachaeta (DC.) Small	ASTERACEAE		native	
Thymophylla pentachaeta (DC.) Small var. belenidium (DC.) Strother	ASTERACEAE		native	
Thysanocarpus conchuliferus Greene	BRASSICACEAE	SANTA CRUZ ISLAND FRINGEPOD	native	
Thysanocarpus curvipes Hook.	BRASSICACEAE		native	
Thysanocarpus curvipes Hook. subsp. amplectens (Greene) P.J. Alexander & Windham	BRASSICACEAE		native	
Thysanocarpus curvipes Hook. subsp. curvipes	BRASSICACEAE		native	
Thysanocarpus curvipes Hook. subsp. elegans (Fisch. & C.A. Mey.) P.J. Alexander & Windham	BRASSICACEAE		native	
Thysanocarpus curvipes Hook. subsp. eradiatus (Jeps.) P.J. Alexander & Windham	BRASSICACEAE		native	
Thysanocarpus curvipes Hook. subsp. longistylus (Jeps.) P.J. Alexander & Windham	BRASSICACEAE		native	
Thysanocarpus desertorum A. Heller	BRASSICACEAE		native	
Thysanocarpus laciniatus Nutt.	BRASSICACEAE		native	
Thysanocarpus radians Benth.	BRASSICACEAE		native	
Thysanocarpus rigidus (Munz) P.J. Alexander & Windham	BRASSICACEAE		native	
Tiarella trifoliata L.	SAXIFRAGACEAE	LACE FLOWER	native	
Tiarella trifoliata L. var. trifoliata	SAXIFRAGACEAE		native	
Tiarella trifoliata L. var. unifoliata (Hook.) Kurtz	SAXIFRAGACEAE		native	
Tidestromia lanuginosa (Nutt.) Standl.	AMARANTHACEAE	WOOLLY TIDESTROMIA	native	
Tidestromia suffruticosa (Torr.) Standl. var. oblongifolia (S. Watson) Sánch.Pino & Flores Olv.	AMARANTHACEAE	HONEYSWEET	native	
Tiquilia canescens (DC.) A. T. Richardson	BORAGINACEAE	SHRUBBY TIQUILIA	native	
Tiquilia canescens (DC.) A. T. Richardson var. canescens	BORAGINACEAE		native	
Tiquilia canescens (DC.) A. T. Richardson var. pulchella (I. M. Johnst.) A. T. Richardson	BORAGINACEAE		native	
Tiquilia nuttallii (Hook.) A. T. Richardson	BORAGINACEAE	ANNUAL TIQUILIA	native	
Tiquilia palmeri (A. Gray) A. T. Richardson	BORAGINACEAE	PALMER'S TIQUILIA	native	
Tiquilia plicata (Torr.) A. T. Richardson	BORAGINACEAE	FAN-LEAVED TIQUILIA	native	
Tolmiea diplomenziesii Judd, Soltis, & P. S. Soltis	SAXIFRAGACEAE		native	
Tolpis barbata (L.) Gaertn.	ASTERACEAE		naturalized	
Tonella tenella (Benth.) A. Heller	PLANTAGINACEAE		native	
Tonestus eximius (H. M. Hall) A. Nelson & J. F. Macbr.	ASTERACEAE	TAHOE TONESTUS	native	
Tonestus lyallii (A. Gray) A. Nelson	ASTERACEAE	LYALL'S TONESTUS	native	
Tonestus peirsonii (D. D. Keck) G. L. Nesom & D. R. Morgan	ASTERACEAE	PEIRSON'S TONESTUS	native	
Torilis arvensis (Huds.) Link	APIACEAE	TALL SOCK-DESTROYER	naturalized	
Torilis nodosa (L.) Gaertn.	APIACEAE	SHORT SOCK-DESTROYER	naturalized	
Torreya californica Torr.	TAXACEAE	CALIFORNIA-NUTMEG	native	
Torreyochloa erecta (Hitchc.) G. L. Church	POACEAE		native	
Torreyochloa pallida (Torr.) G. L. Church	POACEAE		native	
Torreyochloa pallida (Torr.) G. L. Church var. pauciflora (J. Presl) J. I Davis	POACEAE	WEAK MANNA GRASS	native	
Townsendia condensata Parry	ASTERACEAE	CUSHION TOWNSENDIA	native	
Townsendia leptotes (A. Gray) Osterh.	ASTERACEAE	SLENDER TOWNSENDIA	native	
Townsendia scapigera D. C. Eaton	ASTERACEAE		native	
Toxicodendron diversilobum (Torr. & A. Gray) Greene	ANACARDIACEAE	WESTERN POISON OAK	native	
Toxicoscordion brevibracteatum (M. E. Jones) R. R. Gates	MELANTHIACEAE		native	
Toxicoscordion exaltatum (Eastw.) A. Heller	MELANTHIACEAE		native	
Toxicoscordion fontanum (Eastw.) Zomlefer & Judd	MELANTHIACEAE		native	
Toxicoscordion fremontii (Torr.) Rydb.	MELANTHIACEAE		native	
Toxicoscordion micranthum (Eastw.) A. Heller	MELANTHIACEAE		native	
Toxicoscordion paniculatum (Nutt.) Rydb.	MELANTHIACEAE		native	
Toxicoscordion venenosum (S. Watson) Rydb.	MELANTHIACEAE		native	
Toxicoscordion venenosum (S. Watson) Rydb. var. venenosum	MELANTHIACEAE		native	
Tracyina rostrata S. F. Blake	ASTERACEAE	BEAKED TRACYINA	native	
Tradescantia fluminensis Vell.	COMMELINACEAE		naturalized	
Tragia ramosa Torr.	EUPHORBIACEAE	DESERT TRAGIA	native	
Tragopogon dubius Scop.	ASTERACEAE		naturalized	
Tragopogon porrifolius L.	ASTERACEAE	OYSTER PLANT	naturalized	
Tragopogon pratensis L.	ASTERACEAE	MEADOW SALSIFY	naturalized	
Transberingia bursifolia (DC.) Al-Shehbaz & O'Kane subsp. virgata (Nutt.) Al-Shehbaz & O'Kane	BRASSICACEAE	VIRGATE HALIMOLOBOS	native	
Trautvetteria caroliniensis (Walter) Vail	RANUNCULACEAE		native	
Triadica sebifera (L.) Small	EUPHORBIACEAE	CHINESE TALLOWTREE	naturalized	
Triantha occidentalis (S. Watson) R. R. Gates	TOFIELDIACEAE		native	
Triantha occidentalis (S. Watson) R. R. Gates subsp. occidentalis	TOFIELDIACEAE		native	
Trianthema portulacastrum L.	AIZOACEAE		native	
Tribolium obliterum (Hemsl.) Renvoize	POACEAE		naturalized	
Tribulus terrestris L.	ZYGOPHYLLACEAE		naturalized	
Tricardia watsonii Torr ex S. Watson	BORAGINACEAE	THREE HEARTS	native	
Trichocoronis wrightii (Torr. & A. Gray) A. Gray	ASTERACEAE		native	
Trichocoronis wrightii (Torr. & A. Gray) A. Gray var. wrightii	ASTERACEAE	WRIGHT'S TRICHOCORONIS	native	
Trichophorum clementis (M. E. Jones) S. G. Sm.	CYPERACEAE		native	
Trichophorum pumilum (Vahl) Schinz & Thell.	CYPERACEAE	LITTLE BULRUSH	native	
Trichoptilium incisum (A. Gray) A. Gray	ASTERACEAE		native	
Trichostema austromontanum H. Lewis	LAMIACEAE		native	
Trichostema austromontanum H. Lewis subsp. austromontanum	LAMIACEAE		native	
Trichostema austromontanum H. Lewis subsp. compactum H. Lewis	LAMIACEAE	HIDDEN LAKE BLUECURLS	native	
Trichostema lanatum Benth.	LAMIACEAE	WOOLLY BLUE CURLS	native	
Trichostema lanceolatum Benth.	LAMIACEAE	VINEGAR WEED	native	
Trichostema laxum A. Gray	LAMIACEAE	TURPENTINE WEED	native	
Trichostema micranthum A. Gray	LAMIACEAE	SMALL-FLOWERED BLUECURLS	native	
Trichostema oblongum Benth.	LAMIACEAE		native	
Trichostema ovatum Curran	LAMIACEAE	SAN JOAQUIN BLUECURLS	native	
Trichostema parishii Vasey	LAMIACEAE		native	
Trichostema rubisepalum Elmer	LAMIACEAE	HERNANDEZ BLUECURLS	native	
Trichostema ruygtii H. Lewis	LAMIACEAE	NAPA BLUECURLS	native	
Trichostema simulatum Jeps.	LAMIACEAE		native	
Tridens muticus (Torr.) Nash	POACEAE		native	
Tridens muticus (Torr.) Nash var. muticus	POACEAE	SLIM TRIDENS	native	
Trientalis europaea L.	MYRSINACEAE	ARCTIC STARFLOWER	native	
Trientalis latifolia Hook.	MYRSINACEAE		native	
Trifolium albopurpureum Torr. & A. Gray	FABACEAE		native	
Trifolium amoenum Greene	FABACEAE	TWO-FORK CLOVER	native	
Trifolium andersonii A. Gray	FABACEAE		native	
Trifolium andersonii A. Gray subsp. andersonii	FABACEAE	ANDERSON'S CLOVER	native	
Trifolium andersonii A. Gray subsp. beatleyae J. M. Gillett	FABACEAE	BEATLEY'S FIVE-LEAVED CLOVER	native	
Trifolium angustifolium L.	FABACEAE	NARROW-LEAVED CLOVER	naturalized	
Trifolium arvense L.	FABACEAE	RABBITFOOT CLOVER	naturalized	
Trifolium aureum Pollich	FABACEAE	LARGE HOP CLOVER	naturalized	
Trifolium barbigerum Torr.	FABACEAE	BEARDED CLOVER	native	
Trifolium beckwithii S. Watson	FABACEAE	BECKWITH'S CLOVER	native	
Trifolium bifidum A. Gray	FABACEAE	PINOLE CLOVER	native	
Trifolium bifidum A. Gray var. bifidum	FABACEAE		native	
Trifolium bifidum A. Gray var. decipiens Greene	FABACEAE		native	
Trifolium bolanderi A. Gray	FABACEAE	BOLANDER'S CLOVER	native	
Trifolium breweri S. Watson	FABACEAE	BREWER'S CLOVER	native	
Trifolium buckwestiorum Isely	FABACEAE	SANTA CRUZ CLOVER	native	
Trifolium campestre Schreb.	FABACEAE	HOP CLOVER	naturalized	
Trifolium cernuum Brot.	FABACEAE	NODDING CLOVER	naturalized	
Trifolium ciliolatum Benth.	FABACEAE	FOOTHILL CLOVER	native	
Trifolium cyathiferum Lindl.	FABACEAE	BOWL CLOVER	native	
Trifolium depauperatum Desv.	FABACEAE		native	
Trifolium depauperatum Desv. var. amplectens (Torr. & A. Gray) McDermott	FABACEAE	PALE SACK CLOVER	native	
Trifolium depauperatum Desv. var. depauperatum	FABACEAE	DWARF SACK CLOVER	native	
Trifolium depauperatum Desv. var. truncatum (Greene) J. S. Martin ex Isely	FABACEAE	TRUNCATE SACK CLOVER	native	
Trifolium dichotomum Hook. & Arn.	FABACEAE		native	
Trifolium dubium Sibth.	FABACEAE	LITTLE HOP CLOVER	naturalized	
Trifolium eriocephalum Nutt.	FABACEAE		native	
Trifolium eriocephalum Nutt. subsp. eriocephalum	FABACEAE	HAIRY HEAD CLOVER	native	
Trifolium fragiferum L.	FABACEAE	STRAWBERRY CLOVER	naturalized	
Trifolium fucatum Lindl.	FABACEAE	BULL CLOVER	native	
Trifolium glomeratum L.	FABACEAE	CLUSTERED CLOVER	naturalized	
Trifolium gracilentum Torr. & A. Gray	FABACEAE	PINPOINT CLOVER	native	
Trifolium grayi Lojac.	FABACEAE	GRAY'S CLOVER	native	
Trifolium gymnocarpon Nutt.	FABACEAE		native	
Trifolium gymnocarpon Nutt. subsp. plummerae (S. Watson) J. M. Gillett	FABACEAE	PLUMMER'S CLOVER	native	
Trifolium hirtum All.	FABACEAE	ROSE CLOVER	naturalized	
Trifolium howellii S. Watson	FABACEAE	HOWELL'S CLOVER	native	
Trifolium hybridum L.	FABACEAE	ALSIKE CLOVER	naturalized	
Trifolium hydrophilum Greene	FABACEAE	SALINE CLOVER	native	
Trifolium incarnatum L.	FABACEAE	CRIMSON CLOVER	naturalized	
Trifolium jokerstii Vincent & Rand. Morgan	FABACEAE	BUTTE COUNTY GOLDEN CLOVER	native	
Trifolium kingii S. Watson	FABACEAE		native	
Trifolium kingii S. Watson subsp. dedeckerae (J.M. Gillett) D. Heller	FABACEAE	DEDECKER'S CLOVER	native	
Trifolium lemmonii S. Watson	FABACEAE	LEMMON'S CLOVER	native	
Trifolium longipes Nutt.	FABACEAE	LONG-STALKED CLOVER	native	
Trifolium longipes Nutt. subsp. atrorubens (Greene) J. M. Gillett	FABACEAE		native	
Trifolium longipes Nutt. subsp. elmeri (Greene) J. M. Gillett	FABACEAE	ELMER'S CLOVER	native	
Trifolium longipes Nutt. subsp. hansenii (Greene) J. M. Gillett	FABACEAE		native	
Trifolium longipes Nutt. subsp. multipedunculatum (P. B. Kenn.) J. M. Gillett	FABACEAE		native	
Trifolium longipes Nutt. subsp. oreganum (Howell) J. M. Gillett	FABACEAE		native	
Trifolium longipes Nutt. subsp. shastense (House) J. M. Gillett	FABACEAE		native	
Trifolium macraei Hook. & Arn.	FABACEAE	MACRAE'S CLOVER	native	
Trifolium macrocephalum (Pursh) Poir.	FABACEAE	LARGE-HEAD CLOVER	native	
Trifolium microcephalum Pursh	FABACEAE	SMALL-HEAD CLOVER	native	
Trifolium microdon Hook. & Arn.	FABACEAE	THIMBLE CLOVER	native	
Trifolium monanthum A. Gray	FABACEAE		native	
Trifolium monanthum A. Gray subsp. grantianum (A. Heller) J. M. Gillett	FABACEAE	GRANT'S CARPET CLOVER	native	
Trifolium monanthum A. Gray subsp. monanthum	FABACEAE	CARPET CLOVER	native	
Trifolium monanthum A. Gray subsp. parvum (Kellogg) J. M. Gillett	FABACEAE	SMALL CARPET CLOVER	native	
Trifolium monanthum A. Gray subsp. tenerum (Eastw.) J. M. Gillett	FABACEAE	DELICATE CARPET CLOVER	native	
Trifolium obtusiflorum Hook.	FABACEAE	CLAMMY CLOVER	native	
Trifolium oliganthum Steud.	FABACEAE	FEW-FLOWERED CLOVER	native	
Trifolium olivaceum Greene	FABACEAE	OLIVE CLOVER	native	
Trifolium palmeri S. Watson	FABACEAE	SOUTHERN ISLAND CLOVER	native	
Trifolium polyodon Greene	FABACEAE	PACIFIC GROVE CLOVER	native	
Trifolium pratense L.	FABACEAE	RED CLOVER	naturalized	
Trifolium productum Greene	FABACEAE	PRODUCTIVE CLOVER	native	
Trifolium repens L.	FABACEAE	WHITE CLOVER	naturalized	
Trifolium retusum L.	FABACEAE	TEASEL CLOVER	naturalized	
Trifolium siskiyouense J. M. Gillett	FABACEAE	SISKIYOU CLOVER	naturalized	
Trifolium striatum L.	FABACEAE	KNOTTED CLOVER	naturalized	
Trifolium subterraneum L.	FABACEAE	SUBTERRANEAN CLOVER	naturalized	
Trifolium tomentosum L.	FABACEAE	WOOLLY CLOVER	naturalized	
Trifolium trichocalyx A. Heller	FABACEAE	MONTEREY CLOVER	native	
Trifolium variegatum Nutt.	FABACEAE		native	
Trifolium variegatum Nutt. var. geminiflorum (Greene) Vincent	FABACEAE	SMALL-FLOWERED VARIEGATED CLOVER	native	
Trifolium variegatum Nutt. var. major Lojac.	FABACEAE	LARGE VARIEGATED CLOVER	native	
Trifolium variegatum Nutt. var. variegatum	FABACEAE	VARIEGATED CLOVER	native	
Trifolium vesiculosum Savi	FABACEAE	ARROWLEAF CLOVER	naturalized	
Trifolium willdenovii Spreng.	FABACEAE	TOMCAT CLOVER	native	
Trifolium wormskioldii Lehm.	FABACEAE	COW CLOVER	native	
Trifolium wormskioldii Lehm. var. arizonicum (Greene) Barneby	FABACEAE		native	acceptance uncertain
Triglochin concinna Burtt Davy	JUNCAGINACEAE		native	
Triglochin concinna Burtt Davy var. concinna	JUNCAGINACEAE	SEASIDE ARROW-GRASS	native	
Triglochin concinna Burtt Davy var. debilis (M. E. Jones) J. T. Howell	JUNCAGINACEAE		native	
Triglochin maritima L.	JUNCAGINACEAE	COMMON ARROW-GRASS	native	
Triglochin palustris L.	JUNCAGINACEAE	MARSH ARROW-GRASS	native	
Triglochin scilloides (Poir.) Mering & Kadereit	JUNCAGINACEAE	FLOWERING-QUILLWORT	native	
Triglochin striata Ruiz & Pav.	JUNCAGINACEAE	THREE-RIBBED ARROW-GRASS	native	
Trillium albidum J. D. Freeman	MELANTHIACEAE		native	
Trillium angustipetalum (Torr.) J. D. Freeman	MELANTHIACEAE		native	
Trillium chloropetalum (Torr.) Howell	MELANTHIACEAE	GIANT TRILLIUM	native	
Trillium ovatum Pursh	MELANTHIACEAE	WESTERN TRILLIUM	native	
Trillium ovatum Pursh subsp. oettingeri Munz & Thorne	MELANTHIACEAE	SALMON MOUNTAINS WAKEROBIN	native	
Trillium ovatum Pursh subsp. ovatum	MELANTHIACEAE		native	
Triodanis biflora (Ruiz & Pav.) Greene	CAMPANULACEAE		native	
Triodanis perfoliata (L.) Nieuwl.	CAMPANULACEAE		native	
Triphysaria eriantha (Benth.) T. I. Chuang & Heckard subsp. eriantha	OROBANCHACEAE		native	
Triphysaria eriantha (Benth.) T. I. Chuang & Heckard subsp. rosea (A. Gray) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Triphysaria eriantha (Benth.) T.I. Chuang & Heckard	OROBANCHACEAE	JOHNNY-TUCK	native	
Triphysaria floribunda (Benth.) T. I. Chuang & Heckard	OROBANCHACEAE	SAN FRANCISCO OWL'S-CLOVER	native	
Triphysaria micrantha (Greene ex A. Heller) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Triphysaria pusilla (Benth.) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Triphysaria versicolor Fisch. & C. A. Mey.	OROBANCHACEAE		native	
Triphysaria versicolor Fisch. & C. A. Mey. subsp. faucibarbata (A. Gray) T. I. Chuang & Heckard	OROBANCHACEAE		native	
Triphysaria versicolor Fisch. & C. A. Mey. subsp. versicolor	OROBANCHACEAE		native	
Tripleurospermum inodorum (L.) Sch. Bip.	ASTERACEAE	FALSE CHAMOMILE	naturalized	
Tripterocalyx crux-maltae (Kellogg) Standl.	NYCTAGINACEAE	KELLOGG'S SAND-VERBENA	native	
Tripterocalyx micranthus (Torr.) Hook.	NYCTAGINACEAE	SMALL-FLOWERED SAND-VERBENA	native	
Trisetum canescens Buckley	POACEAE	TALL FALSE OAT	native	
Trisetum cernuum Trin.	POACEAE	NODDING FALSE OAT	native	
Trisetum projectum Louis-Marie	POACEAE	INTERRUPTED FALSE OAT	native	
Trisetum spicatum (L.) K. Richt.	POACEAE	SPIKE FALSE OAT	native	
Trisetum wolfii Vasey	POACEAE	WOLF'S FALSE OAT	native	
Triteleia bridgesii (S. Watson) Greene	THEMIDACEAE		native	
Triteleia clementina Hoover	THEMIDACEAE	SAN CLEMENTE ISLAND TRITELEIA	native	
Triteleia crocea (Alph. Wood) Greene	THEMIDACEAE		native	
Triteleia dudleyi Hoover	THEMIDACEAE		native	
Triteleia grandiflora Lindl.	THEMIDACEAE	LARGE-FLOWERED TRITELEIA	native	
Triteleia hendersonii Greene	THEMIDACEAE		native	
Triteleia hyacinthina (Lindl.) Greene	THEMIDACEAE	FOOL'S ONION	native	
Triteleia ixioides (W. T. Aiton) Greene	THEMIDACEAE		native	
Triteleia ixioides (W. T. Aiton) Greene subsp. anilina (Greene) L. W. Lenz	THEMIDACEAE	PRETTY FACE	native	
Triteleia ixioides (W. T. Aiton) Greene subsp. cookii (Hoover) L. W. Lenz	THEMIDACEAE	COOK'S TRITELEIA	native	
Triteleia ixioides (W. T. Aiton) Greene subsp. ixioides	THEMIDACEAE	GOLDEN BRODIAEA	native	
Triteleia ixioides (W. T. Aiton) Greene subsp. scabra (Greene) L. W. Lenz	THEMIDACEAE		native	
Triteleia ixioides (W. T. Aiton) Greene subsp. unifolia L. W. Lenz	THEMIDACEAE		native	
Triteleia laxa Benth.	THEMIDACEAE	COMMON TRITELEIA	native	
Triteleia lilacina Greene	THEMIDACEAE		native	
Triteleia lugens Greene	THEMIDACEAE	DARK-MOUTHED TRITELEIA	native	
Triteleia montana Hoover	THEMIDACEAE	MOUNTAIN TRITELEIA	native	
Triteleia peduncularis Lindl.	THEMIDACEAE	LONG-RAYED BRODIAEA	native	
Triticum aestivum L.	POACEAE		naturalized	
Trixis californica Kellogg	ASTERACEAE		native	
Trixis californica Kellogg var. californica	ASTERACEAE		native	
Tropaeolum majus L.	TROPAEOLACEAE	GARDEN NASTURTIUM	naturalized	
Tropidocarpum californicum (Al-Shehbaz) Al-Shehbaz	BRASSICACEAE	KINGS GOLD	native	
Tropidocarpum capparideum Greene	BRASSICACEAE	CAPER-FRUITED TROPIDOCARPUM	native	
Tropidocarpum gracile Hook.	BRASSICACEAE		native	
Tsuga heterophylla (Raf.) Sarg.	PINACEAE	WESTERN HEMLOCK	native	
Tsuga mertensiana (Bong.) Carrière	PINACEAE	MOUNTAIN HEMLOCK	native	
Tuberaria guttata (L.) Fourr.	CISTACEAE		naturalized	
Tuctoria greenei (Vasey) Reeder	POACEAE	GREENE'S TUCTORIA	native	
Tuctoria mucronata (Crampton) Reeder	POACEAE	SOLANO GRASS	native	
Tulipa clusiana DC.	LILIACEAE	TULIP	naturalized	
Turritis glabra L.	BRASSICACEAE		native	
Typha angustifolia L.	TYPHACEAE	NARROW-LEAVED CATTAIL	naturalized	
Typha domingensis Pers.	TYPHACEAE	SOUTHERN CATTAIL	native	
Typha latifolia L.	TYPHACEAE	BROAD-LEAVED CATTAIL	native	
Ulex europaeus L.	FABACEAE		naturalized	
Ulmus parvifolia Jacq.	ULMACEAE	LACEBARK ELM	naturalized	
Ulmus pumila L.	ULMACEAE	SIBERIAN ELM	naturalized	
Umbellularia californica (Hook. & Arn.) Nutt.	LAURACEAE		native	
Uropappus lindleyi (DC.) Nutt.	ASTERACEAE		native	
Urospermum picroides (L.) F. W. Schmidt	ASTERACEAE		naturalized	
Urtica dioica L.	URTICACEAE		native	
Urtica dioica L. subsp. gracilis (Aiton) Selander	URTICACEAE	AMERICAN STINGING NETTLE	native	
Urtica dioica L. subsp. holosericea (Nutt.) Thorne	URTICACEAE	HOARY NETTLE	native	
Urtica urens L.	URTICACEAE	DWARF NETTLE	naturalized	
Utricularia gibba L.	LENTIBULARIACEAE		native	
Utricularia intermedia Hayne	LENTIBULARIACEAE	FLAT-LEAVED BLADDERWORT	native	
Utricularia macrorhiza Leconte	LENTIBULARIACEAE	COMMON BLADDERWORT	native	
Utricularia minor L.	LENTIBULARIACEAE	LESSER BLADDERWORT	native	
Utricularia ochroleuca R. W. Hartm.	LENTIBULARIACEAE	CREAM-FLOWERED BLADDERWORT	native	
Utricularia subulata L.	LENTIBULARIACEAE		naturalized	
Vaccaria hispanica (Mill.) Rauschert	CARYOPHYLLACEAE		naturalized	
Vaccinium cespitosum Michx.	ERICACEAE	DWARF BILBERRY	native	
Vaccinium deliciosum Piper	ERICACEAE	CASCADE BILBERRY	native	
Vaccinium macrocarpon Aiton	ERICACEAE	CRANBERRY	naturalized	
Vaccinium membranaceum Douglas ex Torr.	ERICACEAE	THINLEAF HUCKLEBERRY	native	
Vaccinium ovatum Pursh	ERICACEAE	CALIFORNIA HUCKLEBERRY	native	
Vaccinium parvifolium Sm.	ERICACEAE	RED HUCKLEBERRY	native	
Vaccinium scoparium Coville	ERICACEAE	LITTLE-LEAVED HUCKLEBERRY	native	
Vaccinium uliginosum L.	ERICACEAE		native	
Vaccinium uliginosum L. subsp. occidentale (A. Gray) Hultén	ERICACEAE	WESTERN BLUEBERRY	native	
Vachellia farnesiana (L.) Wight & Arn.	FABACEAE	SWEET ACACIA	native	
Vachellia farnesiana (L.) Wight & Arn. var. farnesiana	FABACEAE		native	
Vachellia farnesiana (L.) Wight & Arn. var. minuta (M.E. Jones) Seigler & Ebinger	FABACEAE		native	
Vahlodea atropurpurea (Wahlenb.) Fr. ex Hartm.	POACEAE		native	
Valeriana californica A. Heller	VALERIANACEAE		native	
Valeriana occidentalis A. Heller	VALERIANACEAE	WESTERN VALERIAN	native	
Valeriana pubicarpa Rydb.	VALERIANACEAE		native	
Valeriana sitchensis Bong.	VALERIANACEAE		native	
Valeriana sitchensis Bong. subsp. scouleri Piper	VALERIANACEAE		native	
Valeriana sitchensis Bong. subsp. sitchensis	VALERIANACEAE		native	
Valerianella carinata Loisel.	VALERIANACEAE		naturalized	
Valerianella locusta (L.) Betcke	VALERIANACEAE		naturalized	
Vancouveria chrysantha Greene	BERBERIDACEAE	SISKIYOU INSIDE-OUT-FLOWER	native	
Vancouveria hexandra (Hook.) C. Morren & Decne.	BERBERIDACEAE		native	
Vancouveria planipetala Calloni	BERBERIDACEAE	REDWOOD IVY	native	
Velezia rigida L.	CARYOPHYLLACEAE		naturalized	
Venegasia carpesioides DC.	ASTERACEAE		native	
Ventenata dubia (Leers) Durieu	POACEAE	NORTH AFRICA GRASS	naturalized	
Veratrum californicum Durand	MELANTHIACEAE		native	
Veratrum californicum Durand var. californicum	MELANTHIACEAE		native	
Veratrum fimbriatum A. Gray	MELANTHIACEAE	FRINGED FALSE-HELLEBORE	native	
Veratrum insolitum Jeps.	MELANTHIACEAE	SISKIYOU FALSE-HELLEBORE	native	
Veratrum viride Aiton	MELANTHIACEAE		native	
Verbascum blattaria L.	SCROPHULARIACEAE	MOTH MULLEIN	naturalized	
Verbascum bombyciferum Boiss.	SCROPHULARIACEAE	GIANT SILVER MULLEIN	naturalized	
Verbascum speciosum Schrad.	SCROPHULARIACEAE	SHOWY MULLEIN	naturalized	
Verbascum thapsus L.	SCROPHULARIACEAE	WOOLLY MULLEIN	naturalized	
Verbascum virgatum Stokes	SCROPHULARIACEAE	WAND MULLEIN	naturalized	
Verbena bonariensis L.	VERBENACEAE		naturalized	
Verbena bracteata Lag. & Rodr.	VERBENACEAE		native	
Verbena californica Moldenke	VERBENACEAE	RED HILLS VERVAIN	native	
Verbena gooddingii Briq.	VERBENACEAE		native	
Verbena hastata L.	VERBENACEAE		native	
Verbena lasiostachys Link	VERBENACEAE		native	
Verbena lasiostachys Link var. lasiostachys	VERBENACEAE		native	
Verbena lasiostachys Link var. scabrida Moldenke	VERBENACEAE		native	
Verbena litoralis Kunth	VERBENACEAE		naturalized	
Verbena menthifolia Benth.	VERBENACEAE		native	
Verbena pulchella Sweet	VERBENACEAE		naturalized	
Verbena scabra Vahl	VERBENACEAE		native	
Verbesina dissita A. Gray	ASTERACEAE	BIG-LEAVED CROWNBEARD	native	
Verbesina encelioides (Cav.) Benth. & Hook. f. ex A. Gray	ASTERACEAE		naturalized	
Verbesina encelioides (Cav.) Benth. & Hook. f. ex A. Gray subsp. exauriculata (B. L. Rob. & Greenm.) J. R. Coleman	ASTERACEAE	GOLDEN CROWNBEARD	naturalized	
Veronica americana Schwein. ex Benth.	PLANTAGINACEAE	AMERICAN BROOKLIME	native	
Veronica anagallis-aquatica L.	PLANTAGINACEAE	WATER SPEEDWELL	naturalized	
Veronica arvensis L.	PLANTAGINACEAE		naturalized	
Veronica beccabunga L.	PLANTAGINACEAE		naturalized	
Veronica catenata Pennell	PLANTAGINACEAE	CHAIN SPEEDWELL	naturalized	
Veronica copelandii Eastw.	PLANTAGINACEAE	COPELAND'S SPEEDWELL	native	
Veronica cusickii A. Gray	PLANTAGINACEAE	CUSICK'S SPEEDWELL	native	
Veronica peregrina L.	PLANTAGINACEAE		native	
Veronica peregrina L. subsp. xalapensis (Kunth) Pennell	PLANTAGINACEAE	PURSLANE SPEEDWELL	native	
Veronica persica Poir.	PLANTAGINACEAE	PERSIAN SPEEDWELL	naturalized	
Veronica scutellata L.	PLANTAGINACEAE	MARSH SPEEDWELL	native	
Veronica serpyllifolia L.	PLANTAGINACEAE		native	
Veronica serpyllifolia L. subsp. humifusa (Dicks.) Syme	PLANTAGINACEAE		native	
Veronica wormskjoldii Roem. & Schult.	PLANTAGINACEAE	AMERICAN ALPINE SPEEDWELL	native	
Viburnum edule (Michx.) Raf.	ADOXACEAE	SQUASHBERRY	native	
Viburnum ellipticum Hook.	ADOXACEAE	OVAL-LEAVED VIBURNUM	native	
Vicia americana Willd.	FABACEAE		native	
Vicia americana Willd. subsp. americana	FABACEAE	AMERICAN VETCH	native	
Vicia benghalensis L.	FABACEAE	PURPLE VETCH	naturalized	
Vicia gigantea Hook.	FABACEAE	GIANT VETCH	native	
Vicia hassei S. Watson	FABACEAE	SLENDER VETCH	native	
Vicia hirsuta (L.) Gray	FABACEAE		naturalized	
Vicia ludoviciana Nutt. ex Torr. & A. Gray	FABACEAE		native	
Vicia ludoviciana Nutt. ex Torr. & A. Gray subsp. ludoviciana	FABACEAE	DEERPEA VETCH	native	
Vicia lutea L.	FABACEAE	YELLOW VETCH	naturalized	
Vicia sativa L.	FABACEAE		naturalized	
Vicia sativa L. subsp. nigra (L.) Ehrh.	FABACEAE	NARROW-LEAVED VETCH	naturalized	
Vicia sativa L. subsp. sativa	FABACEAE	SPRING VETCH	naturalized	
Vicia tetrasperma (L.) Schreb.	FABACEAE	SPARROW VETCH	naturalized	
Vicia villosa Roth	FABACEAE	WINTER VETCH	naturalized	
Vicia villosa Roth subsp. varia (Host) Corb.	FABACEAE		naturalized	
Vicia villosa Roth subsp. villosa	FABACEAE		naturalized	
Viguiera purisimae Brandegee	ASTERACEAE	LA PURISIMA VIGUIERA	native	
Vinca major L.	APOCYNACEAE	GREATER PERIWINKLE	naturalized	
Viola adunca Sm.	VIOLACEAE		native	
Viola adunca Sm. subsp. adunca	VIOLACEAE	EARLY BLUE VIOLET	native	
Viola arvensis Murray	VIOLACEAE	WILD PANSY	naturalized	
Viola bakeri Greene	VIOLACEAE	BAKER'S VIOLET	native	
Viola beckwithii Torr. & A. Gray	VIOLACEAE	GREAT BASIN VIOLET	native	
Viola cuneata S. Watson	VIOLACEAE	WEDGE-LEAVED VIOLET	native	
Viola douglasii Steud.	VIOLACEAE	GOLDEN VIOLET	native	
Viola glabella Nutt. in Torr. & A. Gray	VIOLACEAE	SMOOTH YELLOW VIOLET	native	
Viola hallii A. Gray	VIOLACEAE	WILD PANSY	native	
Viola howellii A. Gray	VIOLACEAE	HOWELL'S VIOLET	native	
Viola langsdorffii Fisch. ex Ging.	VIOLACEAE	LANGSDORF'S VIOLET	native	
Viola lobata Benth.	VIOLACEAE	YELLOW WOOD VIOLET	native	
Viola lobata Benth. subsp. integrifolia (S. Watson) R. J. Little	VIOLACEAE		native	
Viola lobata Benth. subsp. lobata	VIOLACEAE		native	
Viola macloskeyi F. E. Lloyd	VIOLACEAE	SMOOTH WHITE VIOLET	native	
Viola nephrophylla Greene	VIOLACEAE	LECONTE VIOLET	native	
Viola ocellata Torr. & A. Gray	VIOLACEAE	TWO-EYED VIOLET	native	
Viola odorata L.	VIOLACEAE	SWEET VIOLET	naturalized	
Viola palustris L.	VIOLACEAE	ALPINE MARSH VIOLET	native	
Viola pedunculata Torr. & A. Gray	VIOLACEAE	JOHNNY-JUMP-UP	native	
Viola pinetorum Greene	VIOLACEAE	MOUNTAIN YELLOW VIOLET	native	
Viola pinetorum Greene subsp. grisea (Jeps.) R. J. Little	VIOLACEAE	GRAY-LEAVED VIOLET	native	
Viola pinetorum Greene subsp. pinetorum	VIOLACEAE		native	
Viola praemorsa Douglas ex Lindl.	VIOLACEAE		native	
Viola praemorsa Douglas ex Lindl. subsp. linguifolia (Nutt.) M.S. Baker & J.C. Clausen	VIOLACEAE		native	
Viola praemorsa Douglas ex Lindl. subsp. praemorsa	VIOLACEAE	YELLOW MONTANE VIOLET	native	
Viola primulifolia L.	VIOLACEAE		native	
Viola primulifolia L. subsp. occidentalis (A. Gray) L.E. McKinney & R. J. Little	VIOLACEAE	WESTERN WHITE BOG VIOLET	native	
Viola purpurea Kellogg	VIOLACEAE		native	
Viola purpurea Kellogg subsp. aurea (Kellogg) J.C. Clausen	VIOLACEAE	GOLDEN VIOLET	native	
Viola purpurea Kellogg subsp. dimorpha M. S. Baker & J. C. Clausen	VIOLACEAE		native	
Viola purpurea Kellogg subsp. integrifolia M. S. Baker & J. C. Clausen	VIOLACEAE		native	
Viola purpurea Kellogg subsp. mesophyta M. S. Baker & J. C. Clausen	VIOLACEAE		native	
Viola purpurea Kellogg subsp. mohavensis (M. S. Baker & J. C. Clausen) J. C. Clausen	VIOLACEAE		native	
Viola purpurea Kellogg subsp. purpurea	VIOLACEAE	MOUNTAIN VIOLET	native	
Viola purpurea Kellogg subsp. quercetorum (M. S. Baker & J. C. Clausen) R. J. Little	VIOLACEAE		native	
Viola purpurea Kellogg subsp. venosa (S. Watson) M. S. Baker & J. C. Clausen	VIOLACEAE	PURPLE-MARKED YELLOW VIOLET	native	
Viola sempervirens Greene	VIOLACEAE	REDWOOD VIOLET	native	
Viola sheltonii Torr.	VIOLACEAE	SHELTON'S VIOLET	native	
Viola tomentosa M. S. Baker & J. C. Clausen	VIOLACEAE	FELT-LEAVED VIOLET	native	
Viscum album L.	VISCACEAE	EUROPEAN MISTLETOE	naturalized	
Vitex agnus-castus L.	VERBENACEAE		naturalized	acceptance uncertain
Vitex agnus-castus L. var. agnus-castus	VERBENACEAE		naturalized	acceptance uncertain
Vitis californica Benth.	VITACEAE	CALIFORNIA WILD GRAPE	native	
Vitis girdiana Munson	VITACEAE	DESERT WILD GRAPE	native	
Vitis vinifera L.	VITACEAE	WINE GRAPE	naturalized	
Volutaria muricata (L.) Maire	ASTERACEAE	MOROCCO KNAPWEED	naturalized	
Washingtonia filifera (Linden ex André) H. Wendl. ex de Bary	ARECACEAE	CALIFORNIA FAN PALM	native	
Washingtonia robusta H. Wendl.	ARECACEAE	MEXICAN FAN PALM	naturalized	acceptance uncertain
Watsonia meriana (L.) Mill.	IRIDACEAE		naturalized	
Whipplea modesta Torr.	HYDRANGEACEAE		native	
Wigandia caracasana Kunth	BORAGINACEAE		naturalized	acceptance uncertain
Wislizenia refracta Engelm.	CLEOMACEAE	JACKASS-CLOVER	native	
Wislizenia refracta Engelm. subsp. californica (Greene) S. Keller	CLEOMACEAE		native	
Wislizenia refracta Engelm. subsp. palmeri (A. Gray) S. Keller	CLEOMACEAE	PALMER'S JACKASS-CLOVER	native	
Wislizenia refracta Engelm. subsp. refracta	CLEOMACEAE		native	
Wolffia arrhiza (L.) Wimm.	ARACEAE		naturalized	
Wolffia borealis (Engelm. ex Hegelm.) Landolt & Wildi	ARACEAE		native	
Wolffia brasiliensis Wedd.	ARACEAE	BRAZILIAN WATERMEAL	native	
Wolffia columbiana H. Karst.	ARACEAE		native	
Wolffia globosa (Roxb.) Hartog & Plas	ARACEAE		native	
Wolffiella lingulata (Hegelm.) Hegelm.	ARACEAE		native	
Wolffiella oblonga (Phil.) Hegelm.	ARACEAE		native	
Woodsia oregana D. C. Eaton	WOODSIACEAE		native	
Woodsia plummerae Lemmon	WOODSIACEAE	PLUMMER'S WOODSIA	native	
Woodsia scopulina D. C. Eaton	WOODSIACEAE		native	
Woodwardia fimbriata Sm.	BLECHNACEAE	GIANT CHAIN FERN	native	
Wyethia angustifolia (DC.) Nutt.	ASTERACEAE		native	
Wyethia bolanderi (A. Gray) W. A. Weber	ASTERACEAE	BOLANDER'S MULE'S EARS	native	
Wyethia elata H. M. Hall	ASTERACEAE	HALL'S WYETHIA	native	
Wyethia glabra A. Gray	ASTERACEAE		native	
Wyethia helenioides (DC.) Nutt.	ASTERACEAE		native	
Wyethia invenusta (Greene) W. A. Weber	ASTERACEAE	RAYLESS MULE'S EARS	native	
Wyethia longicaulis A. Gray	ASTERACEAE	HUMBOLDT COUNTY WYETHIA	native	
Wyethia mollis A. Gray	ASTERACEAE		native	
Wyethia ovata Torr. & A. Gray	ASTERACEAE	SOUTHERN MULE'S EARS	native	
Wyethia reticulata Greene	ASTERACEAE	EL DORADO COUNTY MULE EARS	native	
Xanthisma gracile (Nutt.) D. R. Morgan & R. L. Hartm.	ASTERACEAE	ANNUAL BRISTLEWEED	native	
Xanthisma junceum (Greene) D. R. Morgan & R. L. Hartm.	ASTERACEAE	RUSH-LIKE BRISTLEWEED	native	
Xanthisma spinulosum (Pursh) D. R. Morgan & R. L. Hartm.	ASTERACEAE		native	
Xanthisma spinulosum (Pursh) D. R. Morgan & R. L. Hartm. var. gooddingii (A. Nelson) D. R. Morgan & R. L. Hartm.	ASTERACEAE	SPINY GOLDENWEED	native	
Xanthium spinosum L.	ASTERACEAE	SPINY COCKLEBUR	native	
Xanthium strumarium L.	ASTERACEAE	COCKLEBUR	native	
Xerophyllum tenax (Pursh) Nutt.	MELANTHIACEAE		native	
Xylococcus bicolor Nutt.	ERICACEAE		native	
Xylorhiza cognata (H. M. Hall) T. J. Watson	ASTERACEAE	MECCA-ASTER	native	
Xylorhiza orcuttii (Vasey & Rose) Greene	ASTERACEAE	ORCUTT'S WOODY-ASTER	native	
Xylorhiza tortifolia (Torr. & A. Gray) Greene	ASTERACEAE		native	
Xylorhiza tortifolia (Torr. & A. Gray) Greene var. tortifolia	ASTERACEAE	MOJAVE-ASTER	native	
Yabea microcarpa (Hook. & Arn.) Koso-Pol.	APIACEAE		native	
Yucca baccata Torr.	AGAVACEAE		native	
Yucca baccata Torr. var. baccata	AGAVACEAE	BLUE YUCCA	native	
Yucca brevifolia Engelm.	AGAVACEAE	JOSHUA TREE	native	
Yucca schidigera Ortgies	AGAVACEAE	MOJAVE YUCCA	native	
Zannichellia palustris L.	ZANNICHELLIACEAE		native	
Zantedeschia aethiopica (L.) Spreng.	ARACEAE	CALLA-LILY	naturalized	
Zeltnera davyi (Jeps.) G. Mans.	GENTIANACEAE	DAVY'S CENTAURY	native	
Zeltnera exaltata (Griseb.) G. Mans.	GENTIANACEAE	DESERT CENTAURY	native	
Zeltnera muehlenbergii (Griseb.) G. Mans.	GENTIANACEAE	MONTEREY CENTAURY	native	
Zeltnera namophila (Reveal, C.R. Broome, & Beatley) G. Mans.	GENTIANACEAE	SPRING-LOVING CENTAURY	native	
Zeltnera trichantha (Griseb.) G. Mans.	GENTIANACEAE	ALKALI CENTAURY	native	
Zeltnera venusta (A. Gray) G. Mans.	GENTIANACEAE	CHARMING CENTAURY	native	
Ziziphus obtusifolia (Hook. ex Torr. & A. Gray) A. Gray	RHAMNACEAE		native	
Ziziphus obtusifolia (Hook. ex Torr. & A. Gray) A. Gray var. canescens (A. Gray) M. C. Johnst.	RHAMNACEAE	GRAYTHORN	native	
Ziziphus parryi Torr.	RHAMNACEAE		native	
Ziziphus parryi Torr. var. parryi	RHAMNACEAE	PARRY'S JUJUBE	native	
Zostera asiatica Miki	ZOSTERACEAE		naturalized	acceptance uncertain
Zostera japonica Asch. & Graebn.	ZOSTERACEAE		naturalized	acceptance uncertain
Zostera marina L.	ZOSTERACEAE		native	
Zostera pacifica S. Watson	ZOSTERACEAE		native	
Zygophyllum fabago L.	ZYGOPHYLLACEAE		naturalized