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Key to families Table of families and genera
  Index to accepted names and synonyms:
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Scientific Name

Index Page: P

Scientific NameCommon Name
Packera
  ↳  Key to Packera
GROUNDSEL, RAGWORT, BUTTERWEED
Packera bernardinaSAN BERNARDINO RAGWORTNative
Packera bolanderi var. bolanderiSEACOAST RAGWORTNative
Packera breweriBREWER'S RAGWORTNative
Packera canaWOOLLY GROUNDSELNative
Packera clevelandiiCLEVELAND'S RAGWORTNative
Packera clevelandii
(Under Packera clevelandii)
Synonym
Packera eurycephalaNative
Packera eurycephala var. eurycephalaWIDEHEAD GROUNDSELNative
Packera eurycephala var. lewisroseiLEWIS ROSE'S RAGWORTNative
Packera ganderiGANDER'S RAGWORTNative
Packera greeneiFLAME RAGWORTNative
Packera hesperiaWESTERN RAGWORTNative
Packera indecoraRAYLESS MOUNTAIN RAGWORTNative
Packera ionophyllaTEHACHAPI RAGWORTNative
Packera layneaeLAYNE'S RAGWORTNative
Packera macouniiSISKIYOU MOUNTAINS RAGWORTNative
Packera multilobataLOBELEAF GROUNDSELNative
Packera paucifloraALPINE GROUNDSELNative
Packera pseudaurea var. pseudaureaFALSE-GOLD GROUNDSELNative
Packera streptanthifolia var. rubricaulis
(Under Packera streptanthifolia var. streptanthifolia)
Synonym
Packera streptanthifolia var. streptanthifoliaROCKY MOUNTAIN GROUNDSELNative
Packera subnuda var. subnudaCLEFTLEAF GROUNDSELNative
Packera werneriifoliaHOARY GROUNDSELNative
Paeonia
  ↳  Key to Paeonia
PEONY
Paeonia browniiNative
Paeonia californicaNative
PaeoniaceaePEONY FAMILY
Palafoxia
Palafoxia arida
  ↳  Key to Palafoxia arida
Native
Palafoxia arida var. aridaNative
Palafoxia arida var. giganteaGIANT SPANISH-NEEDLENative
Pallenis
Pallenis maritimaGOLD COINNaturalized
Pancratium
Pancratium maritimumNaturalized
Panicum
  ↳  Key to Panicum
PANIC GRASS
Panicum acuminatumNative
Panicum acuminatum var. acuminatum
(Under Panicum acuminatum)
Mentioned in
a note
Panicum acuminatum var. fasciculatumPACIFIC PANIC GRASSNative
Panicum acuminatum var. lindheimeriNative
Panicum acuminatum var. thermaleGEYSERS PANICUMNative
Panicum antidotaleBLUE PANIC GRASSNaturalized
Panicum capillareWITCH GRASSNative
Panicum capillare subsp. hillmanii
(Under Panicum hillmanii)
Synonym
Panicum dichotomiflorum subsp. dichotomiflorumFALL PANIC GRASSNaturalized
Panicum dichotomiflorum var. dichotomiflorum
(Under Panicum dichotomiflorum subsp. dichotomiflorum)
Synonym
Panicum hillmaniiHILLMAN'S PANIC GRASSNaturalized
Panicum hirticaule subsp. hirticauleROUGHSTALK WITCH GRASSNative
Panicum hirticaule var. hirticaule
(Under Panicum hirticaule subsp. hirticaule)
Synonym
Panicum huachucae
(Under Panicum acuminatum var. fasciculatum)
Synonym
Panicum lassenianum
(Under Panicum acuminatum var. thermale)
Synonym
Panicum lindheimeri
(Under Panicum acuminatum var. lindheimeri)
Synonym
Panicum miliaceum subsp. miliaceumBROOM CORN MILLETNaturalized
Panicum occidentale
(Under Panicum acuminatum var. fasciculatum)
Synonym
Panicum oligosanthes var. oligosanthes
(Under Panicum oligosanthes var. scribnerianum)
Mentioned in
a note
Panicum oligosanthes var. scribnerianumSCRIBNER'S PANIC GRASSNative
Panicum pacificum
(Under Panicum acuminatum var. fasciculatum)
Synonym
Panicum rigidulum subsp. rigidulumREDTOP PANICUMNaturalized
Panicum rigidulum var. rigidulum
(Under Panicum rigidulum subsp. rigidulum)
Synonym
Panicum scribnerianum
(Under Panicum oligosanthes var. scribnerianum)
Synonym
Panicum thermale
(Under Panicum acuminatum var. thermale)
Synonym
Panicum urvilleanumSILKY PANIC GRASSNative
Papaver
  ↳  Key to Papaver
Papaver apulum var. micranthum
(Under Papaver hybridum)
Synonym
Papaver argemoneWaif
Papaver californicumFIRE POPPYNative
Papaver dubium
(Under Papaver)
Mentioned in
a note
Papaver heterophyllumWIND POPPYNative
Papaver hybridumROUGH POPPYNaturalized
Papaver lemmonii
(Under Papaver californicum)
Synonym
Papaver rhoeasCORN POPPYNaturalized
Papaver somniferumOPIUM POPPYWaif
Papaveraceae
  ↳  Key to Papaveraceae
POPPY FAMILY
Pappostipa speciosa
(Under Stipa speciosa)
Synonym
Paragymnopteris marantae
(Under Pellaea breweri)
Mentioned in
a note
Paragymnopteris sargentii
(Under Pellaea breweri)
Mentioned in
a note
Parapholis
  ↳  Key to Parapholis
SICKLE GRASS
Parapholis incurvaNaturalized
Parapholis strigosaNaturalized
Paraserianthes lophantha
(Under Albizia lophantha)
Synonym
Parathelypteris nevadensis
(Under Thelypteris nevadensis)
Synonym
Parentucellia
  ↳  Key to Parentucellia
Parentucellia latifoliaNaturalized
Parentucellia viscosaNaturalized
Parietaria
  ↳  Key to Parietaria
PELLITORY
Parietaria floridana
(Under Parietaria)
Mentioned in
a note
Parietaria hesperaNative
Parietaria hespera var. californicaNative
Parietaria hespera var. hesperaNative
Parietaria judaicaNaturalized
Parietaria pensylvanicaNative
Parishella californica
(Under Nemacladus californicus)
Synonym
Parishella californica
(Under Nemacladus)
Mentioned in
a note
Parkinsonia
  ↳  Key to Parkinsonia
PALO VERDE
Parkinsonia aculeataMEXICAN PALO VERDENaturalized
Parkinsonia floridaBLUE PALO VERDENative
Parkinsonia microphyllaLITTLE-LEAVED PALO VERDENative
Parnassia
  ↳  Key to Parnassia
GRASS-OF-PARNASSUS
Parnassia californica
(Under Parnassia palustris)
Synonym
Parnassia cirrataNative
Parnassia cirrata var. cirrataSAN BERNARDINO GRASS-OF-PARNASSUSNative
Parnassia cirrata var. intermediaCASCADE GRASS-OF-PARNASSUSNative
Parnassia fimbriataNative
Parnassia palustrisNative
Parnassia palustris var. californica
(Under Parnassia palustris)
Synonym
Parnassia palustris var. montanensis
(Under Parnassia palustris)
Synonym
Parnassia palustris var. neogaea
(Under Parnassia palustris)
Synonym
Parnassia palustris var. parviflora
(Under Parnassia parviflora)
Synonym
Parnassia parvifloraSMALL-FLOWERED GRASS-OF-PARNASSUSNative
ParnassiaceaeGRASS-OF-PARNASSUS FAMILY
Paronychia
  ↳  Key to Paronychia
NAILWORT
Paronychia ahartiiAHART'S NAILWORT, AHART'S PARONYCHIANative
Paronychia echinulata var. echinulataNaturalized
Paronychia franciscanaNaturalized
Paronychia pusilla
(Under Herniaria hirsuta var. cinerea)
Synonym
Parosela parryi
(Under Marina parryi)
Synonym
Parrya menziesii var. glabra
(Under Phoenicaulis cheiranthoides)
Synonym
ParthenocissusVIRGINIA CREEPER
Parthenocissus insertaWOODBINENaturalized
Parthenocissus vitacea
(Under Parthenocissus inserta)
Synonym
Parvisedum congdonii
(Under Sedella pumila)
Synonym
Parvisedum leiocarpum
(Under Sedella leiocarpa)
Synonym
Parvisedum pentandrum
(Under Sedella pentandra)
Synonym
Parvisedum pumilum
(Under Sedella pumila)
Synonym
Pascopyrum smithii
(Under Elymus smithii)
Synonym
Paspalum
  ↳  Key to Paspalum
Paspalum boscianum
(Under Paspalum)
Mentioned in
a note
Paspalum dilatatumDALLIS GRASSNaturalized
Paspalum distichumKNOT GRASSNative
Paspalum distichum var. indutum
(Under Paspalum distichum)
Synonym
Paspalum notatum
(Under Paspalum)
Mentioned in
a note
Paspalum paspalodes
(Under Paspalum distichum)
Synonym
Paspalum pubiflorum
(Under Poaceae (Gramineae))
Mentioned in
a note
Paspalum quadrifarium
(Under Poaceae (Gramineae))
Mentioned in
a note
Paspalum urvilleiNaturalized
Paspalum vaginatumSEASHORE PASPALUMNaturalized
Passiflora
  ↳  Key to Passiflora
PASSION FLOWER
Passiflora caeruleaBLUE PASSION FLOWERNaturalized
Passiflora mixta
(Under Passiflora tarminiana)
Mentioned in
a note
Passiflora mollissima
(Under Passiflora tarminiana)
Synonym
Passiflora tarminianaBANANA PASSION FRUITNaturalized
PassifloraceaePASSION FLOWER FAMILY
PastinacaPARSNIP
Pastinaca sativaNaturalized
Paxistima
Paxistima myrsinitesOREGON BOXWOODNative
Pectiantia
  ↳  Key to Pectiantia
Pectiantia breweriNative
Pectiantia ovalisNative
Pectiantia pentandraNative
Pectis
Pectis papposa var. papposaCHINCH-WEEDNative
Pectocarya
  ↳  Key to Pectocarya
PECTOCARYA, COMBSEED
Pectocarya heterocarpaMIXED-NUT PECTOCARYANative
Pectocarya linearis subsp. feroculaNARROW-TOOTHED PECTOCARYANative
Pectocarya penicillataNORTHERN PECTOCARYANative
Pectocarya peninsularisBAJA PECTOCARYANative
Pectocarya platycarpaWIDE-TOOTHED PECTOCARYANative
Pectocarya pusillaLITTLE PECTOCARYANative
Pectocarya recurvataARCHED-NUT PECTOCARYANative
Pectocarya setosaROUND-NUT PECTOCARYANative
Pedicularis
  ↳  Key to Pedicularis
LOUSEWORT
Pedicularis attollensLITTLE ELEPHANT'S HEADNative
Pedicularis aurantiaca
(Under Pedicularis densiflora)
Synonym
Pedicularis bracteosa var. flavidaYELLOWISH LOUSEWORTNative
Pedicularis centrantheraGREAT BASIN LOUSEWORTNative
Pedicularis contortaCURVED-BEAK LOUSEWORTNative
Pedicularis crenulataSCALLOPED-LEAVED LOUSEWORTNative
Pedicularis crenulata f. candida
(Under Pedicularis crenulata)
Synonym
Pedicularis crenulata subsp. candida
(Under Pedicularis crenulata)
Synonym
Pedicularis densifloraWARRIOR'S PLUMENative
Pedicularis densiflora subsp. aurantiaca
(Under Pedicularis densiflora)
Synonym
Pedicularis dudleyiDUDLEY'S LOUSEWORTNative
Pedicularis flavida
(Under Pedicularis bracteosa var. flavida)
Synonym
Pedicularis groenlandicaELEPHANT'S HEADNative
Pedicularis groenlandica var. surrecta
(Under Pedicularis groenlandica)
Synonym
Pedicularis howelliiHOWELL'S LOUSEWORTNative
Pedicularis racemosaLEAFY LOUSEWORTNative
Pedicularis racemosa subsp. alba
(Under Pedicularis racemosa)
Mentioned in
a note
Pedicularis semibarbataNative
Pedicularis semibarbata subsp. charlestonensis
(Under Pedicularis semibarbata)
Synonym
Pediomelum
  ↳  Key to Pediomelum
BREADROOT
Pediomelum californicumNative
Pediomelum castoreumBEAVER DAM BREADROOTNative
Pediomelum mephiticum
(Under Pediomelum)
Mentioned in
a note
PeganumHARMAL
Peganum harmalaAFRICAN RUE, SYRIAN RUENaturalized
Pelargonium
  ↳  Key to Pelargonium
GARDEN GERANIUM
Pelargonium ×hortorumFISH GERANIUMNaturalized
Pelargonium capitatumWaif
Pelargonium grossularioidesNaturalized
Pelargonium inquinansNaturalized
Pelargonium panduriformeOAK-LEAVED GERANIUMNaturalized
Pelargonium peltatumIVY GERANIUMWaif
Pelargonium quercifolium
(Under Pelargonium)
Mentioned in
a note
Pelargonium vitifoliumWaif
Pelargonium zonaleHORSESHOE GERANIUMWaif
Pellaea
  ↳  Key to Pellaea
CLIFF-BRAKE
Pellaea andromedifoliaCOFFEE FERNNative
Pellaea andromedifolia var. pubescens
(Under Pellaea andromedifolia)
Mentioned in
a note
Pellaea andromedifolia var. rubens
(Under Pellaea andromedifolia)
Mentioned in
a note
Pellaea brachypteraSIERRA CLIFF-BRAKENative
Pellaea breweriBREWER'S CLIFF-BRAKENative
Pellaea bridgesiiBRIDGES' CLIFF-BRAKENative
Pellaea mucronataBIRD'S-FOOT FERNNative
Pellaea mucronata var. californicaNative
Pellaea mucronata var. mucronataNative
Pellaea truncataSPINY CLIFF-BRAKENative
Pellaea wrightiana var. californica
(Under Pellaea mucronata var. californica)
Synonym
Peltandra
Peltandra virginicaGREEN ARROW ARUM, TUCKAHOEWaif
Peltiphyllum peltatum
(Under Darmera peltata)
Synonym
Pennisetum
  ↳  Key to Pennisetum
FOUNTAIN GRASS
Pennisetum advena
(Under Pennisetum setaceum)
Mentioned in
a note
Pennisetum ciliareBUFFEL GRASSNaturalized
Pennisetum clandestinumKIKUYU GRASSNaturalized
Pennisetum glaucum
(Under Pennisetum)
Mentioned in
a note
Pennisetum latifolium
(Under Pennisetum)
Mentioned in
a note
Pennisetum macrourum
(Under Pennisetum)
Mentioned in
a note
Pennisetum nervosum
(Under Pennisetum)
Mentioned in
a note
Pennisetum purpureum
(Under Pennisetum)
Mentioned in
a note
Pennisetum setaceumCRIMSON FOUNTAIN GRASSNaturalized
Pennisetum villosumFEATHERTOPNaturalized
Penstemon
  ↳  Key to Penstemon
BEARDTONGUE
Penstemon albomarginatusWHITE-MARGINED BEARDTONGUENative
Penstemon anguineusNative
Penstemon antirrhinoides subsp. microphyllus
(Under Keckiella antirrhinoides var. microphylla)
Mentioned in
a note
Penstemon austinii
(Under Penstemon floridus var. austinii)
Synonym
Penstemon azureusNative
Penstemon azureus subsp. angustissimus
(Under Penstemon azureus var. angustissimus)
Synonym
Penstemon azureus subsp. azureus
(Under Penstemon azureus var. azureus)
Synonym
Penstemon azureus var. angustissimusNative
Penstemon azureus var. azureusNative
Penstemon barnebyiBARNEBY'S BEARDTONGUENative
Penstemon bicolorNative
Penstemon bridgesii
(Under Penstemon rostriflorus)
Synonym
Penstemon bryantiae
(Under Penstemon palmeri var. palmeri)
Synonym
Penstemon caesiusNative
Penstemon calcareusLIMESTONE BEARDTONGUENative
Penstemon californicusCALIFORNIA BEARDTONGUENative
Penstemon centranthifoliusSCARLET BUGLERNative
Penstemon cinereus
(Under Penstemon humilis var. humilis)
Mentioned in
a note
Penstemon cinicolaASH BEARDTONGUENative
Penstemon clevelandiiNative
Penstemon clevelandii var. clevelandiiNative
Penstemon clevelandii var. connatusSAN JACINTO BEARDTONGUENative
Penstemon clevelandii var. mohavensisNative
Penstemon confusus subsp. patens
(Under Penstemon patens)
Synonym
Penstemon confusus var. patens
(Under Penstemon patens)
Synonym
Penstemon cordifolius
(Under Keckiella cordifolia)
Synonym
Penstemon davidsonii
(Under Penstemon rupicola)
Mentioned in
a note
Penstemon davidsonii var. davidsoniiNative
Penstemon deustusHOT-ROCK PENSTEMONNative
Penstemon deustus subsp. heterander
(Under Penstemon deustus var. pedicellatus)
Synonym
Penstemon deustus subsp. sudans
(Under Penstemon sudans)
Synonym
Penstemon deustus var. deustusNative
Penstemon deustus var. pedicellatusNative
Penstemon deustus var. savagei
(Under Penstemon deustus var. suffrutescens)
Synonym
Penstemon deustus var. suffrutescensNative
Penstemon eatoniiNative
Penstemon eatonii var. eatoniiNative
Penstemon eatonii var. undosusNative
Penstemon filiformisTHREAD-LEAVED BEARDTONGUENative
Penstemon floridusNative
Penstemon floridus var. austiniiNative
Penstemon floridus var. floridusNative
Penstemon fruticiformisNative
Penstemon fruticiformis subsp. amargosae
(Under Penstemon fruticiformis var. amargosae)
Synonym
Penstemon fruticiformis subsp. fruticiformis
(Under Penstemon fruticiformis var. fruticiformis)
Synonym
Penstemon fruticiformis var. amargosaeAMARGOSA BEARDTONGUENative
Penstemon fruticiformis var. fruticiformisNative
Penstemon gracilentusNative
Penstemon grinnelliiNative
Penstemon grinnellii subsp. grinnellii
(Under Penstemon grinnellii var. grinnellii)
Synonym
Penstemon grinnellii subsp. scrophularioides
(Under Penstemon grinnellii var. scrophularioides)
Synonym
Penstemon grinnellii var. grinnelliiNative
Penstemon grinnellii var. scrophularioidesNative
Penstemon heterodoxusNative
Penstemon heterodoxus var. cephalophorusNative
Penstemon heterodoxus var. heterodoxusNative
Penstemon heterodoxus var. shastensisSHASTA BEARDTONGUENative
Penstemon heterophyllusNative
Penstemon heterophyllus subsp. australis
(Under Penstemon heterophyllus var. australis)
Synonym
Penstemon heterophyllus subsp. heterophyllus
(Under Penstemon heterophyllus var. heterophyllus)
Synonym
Penstemon heterophyllus subsp. purdyi
(Under Penstemon heterophyllus var. purdyi)
Synonym
Penstemon heterophyllus var. australisNative
Penstemon heterophyllus var. heterophyllusNative
Penstemon heterophyllus var. purdyiNative
Penstemon hians
(Under Penstemon grinnellii var. grinnellii)
Synonym
Penstemon humilis
(Under Penstemon humilis var. humilis)
Mentioned in
a note
Penstemon humilis subsp. humilis
(Under Penstemon humilis var. humilis)
Synonym
Penstemon humilis var. humilisNative
Penstemon incertusNative
Penstemon jacintensis
(Under Keckiella rothrockii var. jacintensis)
Synonym
Penstemon janishiaeJANISH'S BEARDTONGUENative
Penstemon labrosusNative
Penstemon laetusNative
Penstemon laetus subsp. laetus
(Under Penstemon laetus var. laetus)
Synonym
Penstemon laetus subsp. leptosepalus
(Under Penstemon laetus var. leptosepalus)
Synonym
Penstemon laetus subsp. roezlii
(Under Penstemon roezlii)
Synonym
Penstemon laetus subsp. sagittatus
(Under Penstemon laetus var. sagittatus)
Synonym
Penstemon laetus var. laetusNative
Penstemon laetus var. leptosepalusNative
Penstemon laetus var. sagittatusNative
Penstemon lemmonii
(Under Keckiella lemmonii)
Synonym
Penstemon linarioides var. californicus
(Under Penstemon californicus)
Synonym
Penstemon miser
(Under Penstemon janishiae)
Synonym
Penstemon monoensisNative
Penstemon nemorosus
(Under Nothochelone nemorosa)
Synonym
Penstemon neotericusPLUMAS COUNTY BEARDTONGUENative
Penstemon newberryiNative
Penstemon newberryi subsp. berryi
(Under Penstemon newberryi var. berryi)
Synonym
Penstemon newberryi subsp. newberryi
(Under Penstemon newberryi var. newberryi)
Synonym
Penstemon newberryi subsp. sonomensis
(Under Penstemon newberryi var. sonomensis)
Synonym
Penstemon newberryi var. berryiNative
Penstemon newberryi var. newberryiNative
Penstemon newberryi var. sonomensisSONOMA BEARDTONGUENative
Penstemon oreocharis
(Under Penstemon rydbergii var. oreocharis)
Synonym
Penstemon pahutensisPAHUTE BEARDTONGUENative
Penstemon palmeri var. palmeriNative
Penstemon papillatusINYO BEARDTONGUENative
Penstemon parvulusNative
Penstemon patensNative
Penstemon peirsonii
(Under Penstemon grinnellii var. scrophularioides)
Synonym
Penstemon personatusCLOSED-THROATED BEARDTONGUENative
Penstemon procerusNative
Penstemon procerus var. brachyanthusNative
Penstemon procerus var. formosusNative
Penstemon pseudospectabilisNative
Penstemon purpusiiSNOW MOUNTAIN BEARDTONGUENative
Penstemon rattaniiNative
Penstemon rattanii subsp. kleei
(Under Penstemon rattanii var. kleei)
Synonym
Penstemon rattanii subsp. rattanii
(Under Penstemon rattanii var. rattanii)
Synonym
Penstemon rattanii var. kleeiSANTA CRUZ MOUNTAINS BEARDTONGUENative
Penstemon rattanii var. rattaniiNative
Penstemon roezliiNative
Penstemon rostriflorusNative
Penstemon rupicolaNative
Penstemon rydbergii var. oreocharisNative
Penstemon scapoidesPINYON BEARDTONGUENative
Penstemon scrophularioides
(Under Penstemon grinnellii var. scrophularioides)
Synonym
Penstemon shastensis
(Under Penstemon heterodoxus var. shastensis)
Synonym
Penstemon speciosusNative
Penstemon speciosus subsp. kennedyi
(Under Penstemon speciosus)
Synonym
Penstemon spectabilisNative
Penstemon spectabilis subsp. spectabilis
(Under Penstemon spectabilis var. spectabilis)
Synonym
Penstemon spectabilis subsp. subviscosus
(Under Penstemon spectabilis var. subviscosus)
Synonym
Penstemon spectabilis var. spectabilisNative
Penstemon spectabilis var. subviscosusNative
Penstemon stephensiiSTEPHENS' BEARDTONGUENative
Penstemon strictus
(Under Penstemon)
Mentioned in
a note
Penstemon subglaber
(Under Penstemon)
Mentioned in
a note
Penstemon sudansSUSANVILLE BEARDTONGUENative
Penstemon thompsoniaeTHOMPSON'S BEARDTONGUENative
Penstemon thompsoniae subsp. thompsoniae
(Under Penstemon thompsoniae)
Synonym
Penstemon thurberiTHURBER'S BEARDTONGUENative
Penstemon tracyiTRACY'S BEARDTONGUENative
Penstemon utahensisUTAH BEARDTONGUENative
Penstemon venustusNaturalized
Pentachaeta
  ↳  Key to Pentachaeta
Pentachaeta alsinoidesNative
Pentachaeta aureaNative
Pentachaeta aurea subsp. alleniiALLEN'S PENTACHAETANative
Pentachaeta aurea subsp. aureaGOLDEN-RAYED PENTACHAETANative
Pentachaeta bellidifloraWHITE-RAYED PENTACHAETANative
Pentachaeta exilisNative
Pentachaeta exilis subsp. aeolicaSAN BENITO PENTACHAETANative
Pentachaeta exilis subsp. exilisNative
Pentachaeta fragilisFRAGILE PENTACHAETANative
Pentachaeta lyoniiLYON'S PENTACHAETANative
Pentagramma
  ↳  Key to Pentagramma
GOLDBACK or SILVERBACK FERN
Pentagramma glanduloviscidaSAN DIEGO SILVERBACK FERNNative
Pentagramma maxoniiDESERT SILVERBACK FERNNative
Pentagramma pallidaFROSTY SILVERBACK FERNNative
Pentagramma rebmaniiREBMAN'S SILVERBACK FERNNative
Pentagramma triangularisGOLDBACK FERNNative
Pentagramma triangularis subsp. maxonii
(Under Pentagramma maxonii)
Synonym
Pentagramma triangularis subsp. rebmanii
(Under Pentagramma rebmanii)
Synonym
Pentagramma triangularis subsp. semipallida
(Under Pentagramma triangularis)
Synonym
Pentagramma triangularis subsp. viscosa
(Under Pentagramma viscosa)
Synonym
Pentagramma viscosaCOASTAL SILVERBACK FERNNative
Pentaphylloides fruticosa
(Under Dasiphora fruticosa)
Synonym
Peplis portula
(Under Lythrum portula)
Synonym
Peraphyllum
Peraphyllum ramosissimumNative
Perezia microcephala
(Under Acourtia microcephala)
Synonym
Pericallis hybrida
(Under Senecio)
Mentioned in
a note
Pericome
Pericome caudataNative
Perideridia
  ↳  Key to Perideridia
YAMPAH
Perideridia bacigalupiiBACIGALUPI'S YAMPAHNative
Perideridia bolanderiNative
Perideridia bolanderi subsp. bolanderiNative
Perideridia bolanderi subsp. involucrataNative
Perideridia californicaNative
Perideridia gairdneriNative
Perideridia gairdneri subsp. borealisNative
Perideridia gairdneri subsp. gairdneriGAIRDNER'S YAMPAHNative
Perideridia howelliiNative
Perideridia kelloggiiNative
Perideridia lemmoniiNative
Perideridia leptocarpaNARROW-SEEDED YAMPAHNative
Perideridia oreganaNative
Perideridia parishiiNative
Perideridia parishii subsp. latifoliaNative
Perideridia parishii subsp. parishiiPARISH'S YAMPAHNative
Perideridia pringleiADOBE YAMPAHNative
Peritoma
  ↳  Key to Peritoma
BEE PLANT
Peritoma arboreaBLADDERPODNative
Peritoma arborea var. angustataNative
Peritoma arborea var. arboreaNative
Peritoma arborea var. globosaNative
Peritoma jonesiiJONES' BEE PLANTNative
Peritoma luteaYELLOW BEE PLANTNative
Peritoma platycarpaGOLDEN BEE PLANTNative
Peritoma serrulataROCKY MOUNTAIN BEE PLANTNaturalized
Perityle
  ↳  Key to Perityle
ROCK DAISY
Perityle emoryiEMORY'S ROCK DAISYNative
Perityle intricataDESERT ROCK DAISYNative
Perityle inyoensisINYO ROCK DAISYNative
Perityle megalocephalaNative
Perityle megalocephala var. intricata
(Under Perityle intricata)
Synonym
Perityle megalocephala var. megalocephalaNEVADA ROCK DAISYNative
Perityle megalocephala var. oligophyllaSMALL-LEAVED ROCK DAISYNative
Perityle villosaHANAUPAH ROCK DAISYNative
PerseaRED BAY
Persea americanaAVOCADOWaif
Persicaria
  ↳  Key to Persicaria
SMARTWEED
Persicaria amphibiaWATER SMARTWEEDNative
Persicaria amphibia var. emersa
(Under Persicaria amphibia)
Synonym
Persicaria amphibia var. stipulacea
(Under Persicaria amphibia)
Synonym
Persicaria capitataNaturalized
Persicaria coccinea
(Under Persicaria amphibia)
Synonym
Persicaria fusiformis
(Under Persicaria maculosa)
Synonym
Persicaria hydropiperWATERPEPPERNaturalized
Persicaria hydropiperoidesFALSE WATERPEPPERNative
Persicaria lapathifoliaWILLOW WEEDNative
Persicaria maculosaLADY'S THUMBNaturalized
Persicaria mississippiensis
(Under Persicaria pensylvanica)
Synonym
Persicaria opelousana
(Under Persicaria hydropiperoides)
Synonym
Persicaria orientalisKISS-ME-OVER-THE-GARDEN-GATEWaif
Persicaria paludicola
(Under Persicaria hydropiperoides)
Synonym
Persicaria pensylvanicaPINKWEEDNaturalized
Persicaria pensylvanica var. dura
(Under Persicaria pensylvanica)
Synonym
Persicaria polystachya
(Under Persicaria wallichii)
Synonym
Persicaria punctataNative
Persicaria wallichiiHIMALAYAN KNOTWEEDNaturalized
Petalonyx
  ↳  Key to Petalonyx
SANDPAPER-PLANT
Petalonyx gilmanii
(Under Petalonyx thurberi subsp. gilmanii)
Synonym
Petalonyx linearisNative
Petalonyx nitidusNative
Petalonyx thurberiNative
Petalonyx thurberi subsp. gilmaniiDEATH VALLEY SANDPAPER-PLANTNative
Petalonyx thurberi subsp. thurberiNative
Petalostemon ornatus
(Under Dalea ornata)
Synonym
Petalostemon searlsiae
(Under Dalea searlsiae)
Synonym
Petasites
Petasites frigidus var. palmatusWESTERN SWEET COLTSFOOTNative
Peteria
Peteria thompsoniaeSPINE-NODED MILKVETCHNative
Petradoria
Petradoria pumila subsp. pumila
(Under Petradoria pumila var. pumila)
Synonym
Petradoria pumila var. pumilaROCK-GOLDENRODNative
Petrophyton caespitosum
(Under Petrophytum caespitosum)
Synonym
Petrophyton caespitosum subsp. acuminatum
(Under Petrophytum caespitosum subsp. acuminatum)
Synonym
Petrophyton caespitosum subsp. caespitosum
(Under Petrophytum caespitosum subsp. caespitosum)
Synonym
Petrophytum
Petrophytum caespitosum
  ↳  Key to Petrophytum caespitosum
Native
Petrophytum caespitosum subsp. acuminatumNative
Petrophytum caespitosum subsp. caespitosumNative
Petrorhagia
  ↳  Key to Petrorhagia
PROLIFEROUS PINK
Petrorhagia dubiaNaturalized
Petrorhagia nanteuiliiNaturalized
Petrorhagia proliferaNaturalized
Petrorhagia velutina
(Under Petrorhagia dubia)
Synonym
Petroselinum
Petroselinum crispumPARSLEYWaif
Petunia
Petunia axillaris
(Under Petunia)
Mentioned in
a note
Petunia parvifloraNative
Petunia violacea
(Under Petunia)
Mentioned in
a note
PeucephyllumPYGMY-CEDAR
Peucephyllum schottiiNative
Phacelia
  ↳  Key to Phacelia
Phacelia acanthominthoides
(Under Phacelia ciliata)
Synonym
Phacelia adenophoraNative
Phacelia affinisNative
Phacelia affinis var. patens
(Under Phacelia affinis)
Mentioned in
a note
Phacelia aldersonii
(Under Phacelia davidsonii)
Synonym
Phacelia alpina
(Under Phacelia hastata var. hastata)
Synonym
Phacelia alvordensis
(Under Phacelia distans)
Synonym
Phacelia amabilisSALINE VALLEY PHACELIANative
Phacelia ambigua
(Under Phacelia crenulata var. ambigua)
Mentioned in
a note
Phacelia ambigua var. minutiflora
(Under Phacelia crenulata var. minutiflora)
Synonym
Phacelia ammophila
(Under Phacelia distans)
Synonym
Phacelia anelsoniiAVEN NELSON'S PHACELIANative
Phacelia argenteaSAND DUNE PHACELIANative
Phacelia arthuri
(Under Phacelia distans)
Synonym
Phacelia austromontanaNative
Phacelia barnebyanaBARNEBY'S PHACELIANative
Phacelia bicolorNative
Phacelia bicolor var. bicolor
(Under Phacelia bicolor)
Synonym
Phacelia biennis
(Under Phacelia hastata var. hastata)
Synonym
Phacelia biolettii
(Under Phacelia californica)
Synonym
Phacelia bolanderiNative
Phacelia brachylobaNative
Phacelia brannanii
(Under Phacelia fremontii)
Synonym
Phacelia breweriNative
Phacelia burkei
(Under Phacelia hastata var. hastata)
Synonym
Phacelia californicaNative
Phacelia californica var. bernardina
(Under Phacelia imbricata var. bernardina)
Synonym
Phacelia californica var. egena
(Under Phacelia egena)
Synonym
Phacelia californica var. jacintensis
(Under Phacelia mutabilis)
Synonym
Phacelia californica var. patula
(Under Phacelia imbricata var. patula)
Synonym
Phacelia californica var. rotundata
(Under Phacelia argentea)
Synonym
Phacelia californica var. rubacea
(Under Phacelia heterophylla var. virgata)
Synonym
Phacelia californica var. virgata
(Under Phacelia heterophylla var. virgata)
Synonym
Phacelia calthifoliaNative
Phacelia campanulariaDESERT BLUEBELLSNative
Phacelia campanularia subsp. campanularia
(Under Phacelia campanularia var. campanularia)
Synonym
Phacelia campanularia subsp. vasiformis
(Under Phacelia campanularia var. vasiformis)
Synonym
Phacelia campanularia var. campanulariaNative
Phacelia campanularia var. vasiformisNative
Phacelia campestris
(Under Phacelia ivesiana)
Synonym
Phacelia canescens
(Under Phacelia hastata var. hastata)
Synonym
Phacelia cicutariaNative
Phacelia cicutaria subsp. hispida
(Under Phacelia cicutaria var. hispida)
Synonym
Phacelia cicutaria var. cicutariaNative
Phacelia cicutaria var. eximia
(Under Phacelia cicutaria var. hispida)
Synonym
Phacelia cicutaria var. heterosepala
(Under Phacelia cicutaria)
Mentioned in
a note
Phacelia cicutaria var. hispidaNative
Phacelia cicutaria var. hubbyi
(Under Phacelia hubbyi)
Synonym
Phacelia ciliataNative
Phacelia ciliata var. opaca
(Under Phacelia ciliata)
Mentioned in
a note
Phacelia ciliosa
(Under Phacelia sericea var. ciliosa)
Synonym
Phacelia cinerea
(Under Phacelia distans)
Synonym
Phacelia circinata var. integrifolia
(Under Phacelia hastata var. hastata)
Synonym
Phacelia circinatiformis
(Under Phacelia phacelioides)
Synonym
Phacelia coeruleaSKY-BLUE PHACELIANative
Phacelia compacta
(Under Phacelia hastata var. compacta)
Synonym
Phacelia congdoniiNative
Phacelia conmixta
(Under Phacelia distans)
Synonym
Phacelia cookeiCOOKE'S PHACELIANative
Phacelia cooperae
(Under Phacelia brachyloba)
Synonym
Phacelia corymbosaNative
Phacelia crassifolia
(Under Phacelia gymnoclada)
Synonym
Phacelia crenulataNative
Phacelia crenulata var. ambiguaNative
Phacelia crenulata var. crenulataNative
Phacelia crenulata var. funerea
(Under Phacelia crenulata var. crenulata)
Synonym
Phacelia crenulata var. minutifloraNative
Phacelia cryptanthaNative
Phacelia cryptantha var. derivata
(Under Phacelia cryptantha)
Synonym
Phacelia curvipesNative
Phacelia curvipes var. davidsonii
(Under Phacelia davidsonii)
Synonym
Phacelia curvipes var. insularis
(Under Phacelia insularis var. insularis)
Synonym
Phacelia curvipes var. macrantha
(Under Phacelia davidsonii)
Synonym
Phacelia curvipes var. pratensis
(Under Phacelia davidsonii)
Synonym
Phacelia curvipes var. yosemitana
(Under Phacelia vallicola)
Synonym
Phacelia dalesiana
(Under Howellanthus dalesianus)
Synonym
Phacelia dalesiana
(Under Phacelia)
Mentioned in
a note
Phacelia dasyphylla
(Under Phacelia hastata var. compacta)
Synonym
Phacelia dasyphylla var. ophitidis
(Under Phacelia corymbosa)
Synonym
Phacelia davidsoniiNative
Phacelia davidsonii var. macrantha
(Under Phacelia davidsonii)
Synonym
Phacelia distansNative
Phacelia distans var. ammophila
(Under Phacelia distans)
Synonym
Phacelia distans var. australis
(Under Phacelia distans)
Synonym
Phacelia distans var. genuina
(Under Phacelia distans)
Synonym
Phacelia distans var. leptostachya
(Under Phacelia distans)
Synonym
Phacelia distans var. scabrella
(Under Phacelia distans)
Synonym
Phacelia divaricataNative
Phacelia divaricata var. congdonii
(Under Phacelia congdonii)
Synonym
Phacelia divaricata var. continentis
(Under Phacelia insularis var. continentis)
Synonym
Phacelia divaricata var. insularis
(Under Phacelia insularis var. insularis)
Synonym
Phacelia dociana
(Under Phacelia quickii)
Synonym
Phacelia douglasiiNative
Phacelia douglasii subsp. cryptantha
(Under Phacelia stellaris)
Synonym
Phacelia douglasii var. cryptantha
(Under Phacelia stellaris)
Synonym
Phacelia douglasii var. petrophila
(Under Phacelia douglasii)
Mentioned in
a note
Phacelia egenaNative
Phacelia eiseniiNative
Phacelia eisenii var. brandegeeana
(Under Phacelia eisenii)
Mentioned in
a note
Phacelia eremica
(Under Phacelia cryptantha)
Synonym
Phacelia exilisTRANSVERSE RANGE PHACELIANative
Phacelia eximia
(Under Phacelia cicutaria var. hispida)
Synonym
Phacelia flaccida
(Under Phacelia rattanii)
Synonym
Phacelia floribundaMANY-FLOWERED PHACELIANative
Phacelia fremontiiNative
Phacelia frigida
(Under Phacelia hastata var. compacta)
Synonym
Phacelia frigida subsp. dasyphylla
(Under Phacelia hastata var. compacta)
Synonym
Phacelia frigida subsp. frigida
(Under Phacelia hastata var. compacta)
Synonym
Phacelia geraniifolia
(Under Phacelia perityloides var. jaegeri)
Synonym
Phacelia glanduliferaNative
Phacelia gooddingii
(Under Phacelia pulchella var. gooddingii)
Synonym
Phacelia grandifloraNative
Phacelia greeneiSCOTT VALLEY PHACELIANative
Phacelia griseaNative
Phacelia gymnocladaNAKED-STEMMED PHACELIANative
Phacelia hallii
(Under Phacelia fremontii)
Synonym
Phacelia hardhamiae
(Under Phacelia longipes)
Mentioned in
a note
Phacelia hastataNative
Phacelia hastata subsp. compacta
(Under Phacelia hastata var. compacta)
Synonym
Phacelia hastata subsp. hastata
(Under Phacelia hastata var. hastata)
Synonym
Phacelia hastata var. alpina
(Under Phacelia hastata var. hastata)
Synonym
Phacelia hastata var. charlestonensis
(Under Phacelia hastata)
Mentioned in
a note
Phacelia hastata var. compactaNative
Phacelia hastata var. dasyphylla
(Under Phacelia hastata var. compacta)
Synonym
Phacelia hastata var. hastataNative
Phacelia hastata var. leucophylla
(Under Phacelia hastata var. hastata)
Synonym
Phacelia heterophylla subsp. virgata
(Under Phacelia heterophylla var. virgata)
Synonym
Phacelia heterophylla var. alpina
(Under Phacelia hastata var. hastata)
Synonym
Phacelia heterophylla var. compacta
(Under Phacelia hastata var. compacta)
Synonym
Phacelia heterophylla var. dasyphylla
(Under Phacelia hastata var. compacta)
Synonym
Phacelia heterophylla var. frigida
(Under Phacelia hastata var. compacta)
Synonym
Phacelia heterophylla var. griseophylla
(Under Phacelia mutabilis)
Synonym
Phacelia heterophylla var. pseudohispida
(Under Phacelia mutabilis)
Synonym
Phacelia heterophylla var. pygmaea
(Under Phacelia hastata var. compacta)
Synonym
Phacelia heterophylla var. rotundata
(Under Phacelia argentea)
Synonym
Phacelia heterophylla var. virgataNative
Phacelia heterosperma
(Under Phacelia lemmonii)
Synonym
Phacelia hispida var. brachyantha
(Under Phacelia cryptantha)
Synonym
Phacelia hispida var. cicutaria
(Under Phacelia cicutaria var. cicutaria)
Synonym
Phacelia hispida var. eximia
(Under Phacelia cicutaria var. hispida)
Synonym
Phacelia hispida var. hubbyi
(Under Phacelia hubbyi)
Synonym
Phacelia hispida var. umbrosa
(Under Phacelia umbrosa)
Synonym
Phacelia hubbyiNative
Phacelia humilisNative
Phacelia humilis var. congdonii
(Under Phacelia congdonii)
Synonym
Phacelia humilis var. dudleyiNative
Phacelia humilis var. humilisNative
Phacelia humilis var. lobata
(Under Phacelia austromontana)
Synonym
Phacelia hydrophylloidesNative
Phacelia imbricataNative
Phacelia imbricata subsp. bernardina
(Under Phacelia imbricata var. bernardina)
Synonym
Phacelia imbricata subsp. imbricata
(Under Phacelia imbricata var. bernardina)
Synonym
Phacelia imbricata subsp. imbricata
(Under Phacelia imbricata var. imbricata)
Synonym
Phacelia imbricata subsp. patula
(Under Phacelia imbricata var. patula)
Synonym
Phacelia imbricata var. bernardinaNative
Phacelia imbricata var. caudata
(Under Phacelia imbricata var. imbricata)
Synonym
Phacelia imbricata var. imbricataNative
Phacelia imbricata var. patulaNative
Phacelia insularisNative
Phacelia insularis var. continentisNORTH COAST PHACELIANative
Phacelia insularis var. insularisNORTHERN CHANNEL ISLANDS PHACELIANative
Phacelia inundataPLAYA PHACELIANative
Phacelia inyoensisINYO PHACELIANative
Phacelia ivesianaNative
Phacelia ivesiana var. glandulifera
(Under Phacelia glandulifera)
Synonym
Phacelia ivesiana var. pediculoides
(Under Phacelia ivesiana)
Mentioned in
a note
Phacelia ixodes
(Under Phacelia)
Mentioned in
a note
Phacelia keckiiSANTIAGO PEAK PHACELIANative
Phacelia lemmoniiNative
Phacelia leonisSISKIYOU PHACELIANative
Phacelia leptostachya
(Under Phacelia distans)
Synonym
Phacelia leucantha
(Under Phacelia brachyloba)
Synonym
Phacelia leucophylla
(Under Phacelia hastata var. hastata)
Synonym
Phacelia leucophylla var. alpina
(Under Phacelia hastata var. hastata)
Synonym
Phacelia leucophylla var. compacta
(Under Phacelia hastata var. compacta)
Synonym
Phacelia leucophylla var. suksdorfii
(Under Phacelia hastata var. hastata)
Synonym
Phacelia linearisNative
Phacelia loasifolia
(Under Phacelia malvifolia var. loasifolia)
Synonym
Phacelia lobata
(Under Phacelia austromontana)
Synonym
Phacelia longipesNative
Phacelia lutea
(Under Phacelia monoensis)
Mentioned in
a note
Phacelia lutea var. glandulifera
(Under Phacelia adenophora)
Synonym
Phacelia luteopurpurea
(Under Phacelia glandulifera)
Synonym
Phacelia lyoniiNative
Phacelia magellanica f. compacta
(Under Phacelia hastata var. compacta)
Synonym
Phacelia magellanica f. egena
(Under Phacelia egena)
Synonym
Phacelia magellanica f. patula
(Under Phacelia imbricata var. patula)
Synonym
Phacelia magellanica var. californica
(Under Phacelia californica)
Synonym
Phacelia magellanica var. corymbosa
(Under Phacelia corymbosa)
Synonym
Phacelia magellanica var. frigida
(Under Phacelia hastata var. compacta)
Synonym
Phacelia magellanica var. griseophylla
(Under Phacelia mutabilis)
Synonym
Phacelia magellanica var. integrifolia
(Under Phacelia hastata var. hastata)
Synonym
Phacelia magellanica var. jacintensis
(Under Phacelia mutabilis)
Synonym
Phacelia magellanica var. patula
(Under Phacelia imbricata var. patula)
Synonym
Phacelia malvifoliaNative
Phacelia malvifolia
(Under Phacelia malvifolia var. loasifolia)
Synonym
Phacelia malvifolia
(Under Phacelia malvifolia var. malvifolia)
Synonym
Phacelia malvifolia subsp. loasifolia
(Under Phacelia malvifolia var. loasifolia)
Synonym
Phacelia malvifolia var. loasifoliaNative
Phacelia malvifolia var. malvifoliaNative
Phacelia marcescensNative
Phacelia menziesii
(Under Phacelia linearis)
Synonym
Phacelia micrantha
(Under Eucrypta micrantha)
Synonym
Phacelia micrantha var. bipinnatifida
(Under Eucrypta chrysanthemifolia var. bipinnatifida)
Synonym
Phacelia minima
(Under Phacelia eisenii)
Synonym
Phacelia minorWILD CANTERBURY BELLSNative
Phacelia minor var. campanularia
(Under Phacelia campanularia var. campanularia)
Synonym
Phacelia minor var. whitlavia
(Under Phacelia minor)
Synonym
Phacelia minutiflora
(Under Phacelia crenulata var. minutiflora)
Synonym
Phacelia mohavensisMOJAVE PHACELIANative
Phacelia mohavensis var. exilis
(Under Phacelia exilis)
Synonym
Phacelia monoensisMONO COUNTY PHACELIANative
Phacelia monosperma
(Under Phacelia heterophylla var. virgata)
Synonym
Phacelia mustelinaDEATH VALLEY ROUND-LEAVED PHACELIANative
Phacelia mutabilisNative
Phacelia mutabilis var. frigida
(Under Phacelia hastata var. compacta)
Synonym
Phacelia namatoides
(Under Phacelia racemosa)
Synonym
Phacelia nashianaCHARLOTTE'S PHACELIANative
Phacelia neglectaNative
Phacelia nemophiloides
(Under Phacelia davidsonii)
Synonym
Phacelia nemoralisNative
Phacelia nemoralis subsp. nemoralis
(Under Phacelia nemoralis var. nemoralis)
Synonym
Phacelia nemoralis subsp. oregonensis
(Under Phacelia nemoralis var. oregonensis)
Synonym
Phacelia nemoralis var. mutabilis
(Under Phacelia mutabilis)
Synonym
Phacelia nemoralis var. nemoralisNative
Phacelia nemoralis var. oregonensisNative
Phacelia nemoralis var. pseudohispida
(Under Phacelia mutabilis)
Synonym
Phacelia nervosa
(Under Phacelia hastata var. hastata)
Synonym
Phacelia novenmillensisNINE MILE CANYON PHACELIANative
Phacelia orcuttiana
(Under Phacelia brachyloba)
Synonym
Phacelia oreopola
(Under Phacelia imbricata var. patula)
Synonym
Phacelia oreopola subsp. oreopola
(Under Phacelia imbricata var. patula)
Synonym
Phacelia oreopola subsp. simulans
(Under Phacelia hastata var. hastata)
Synonym
Phacelia orogenesMOUNTAIN PHACELIANative
Phacelia pachyphyllaNative
Phacelia palmeri
(Under Phacelia stellaris)
Synonym
Phacelia parishiiPARISH'S PHACELIANative
Phacelia parryiNative
Phacelia pedicellataNative
Phacelia peirsonianaPEIRSON'S PHACELIANative
Phacelia perityloidesNative
Phacelia perityloides var. jaegeriJAEGER'S PHACELIANative
Phacelia perityloides var. laxiflora
(Under Phacelia perityloides)
Mentioned in
a note
Phacelia perityloides var. perityloidesNative
Phacelia phacelioidesMOUNT DIABLO PHACELIANative
Phacelia phyllomanica var. interrupta
(Under Phacelia floribunda)
Synonym
Phacelia piersoniae
(Under Phacelia heterophylla var. virgata)
Synonym
Phacelia pinetorum
(Under Eucrypta micrantha)
Synonym
Phacelia pinnata var. pseudohispida
(Under Phacelia mutabilis)
Synonym
Phacelia platylobaNative
Phacelia polysperma
(Under Phacelia lemmonii)
Synonym
Phacelia pratensis
(Under Phacelia davidsonii)
Synonym
Phacelia pringleiNative
Phacelia pringlei var. orogenes
(Under Phacelia orogenes)
Synonym
Phacelia proceraNative
Phacelia pulchella var. gooddingiiGOODDING'S PHACELIANative
Phacelia purpusiiNative
Phacelia quickiiNative
Phacelia racemosaNative
Phacelia ramosissimaNative
Phacelia ramosissima var. austrolitoralis
(Under Phacelia ramosissima)
Synonym
Phacelia ramosissima var. eremophila
(Under Phacelia ramosissima)
Synonym
Phacelia ramosissima var. hispida
(Under Phacelia cicutaria var. hispida)
Synonym
Phacelia ramosissima var. latifolia
(Under Phacelia ramosissima)
Synonym
Phacelia ramosissima var. montereyensis
(Under Phacelia ramosissima)
Synonym
Phacelia ramosissima var. subglabra
(Under Phacelia ramosissima)
Synonym
Phacelia ramosissima var. suffrutescens
(Under Phacelia ramosissima)
Synonym
Phacelia ramosissima var. valida
(Under Phacelia ramosissima)
Synonym
Phacelia rattaniiNative
Phacelia rotundifoliaNative
Phacelia rugulosa
(Under Phacelia affinis)
Synonym
Phacelia salina
(Under Phacelia parishii)
Synonym
Phacelia saxicolaNative
Phacelia scabrella
(Under Phacelia distans)
Synonym
Phacelia sericea subsp. ciliosa
(Under Phacelia sericea var. ciliosa)
Synonym
Phacelia sericea var. biennis
(Under Phacelia hastata var. hastata)
Synonym
Phacelia sericea var. ciliosaBLUE ALPINE PHACELIANative
Phacelia sericea var. nelsonii
(Under Phacelia sericea var. ciliosa)
Synonym
Phacelia sericea var. sericea
(Under Phacelia sericea var. ciliosa)
Mentioned in
a note
Phacelia stebbinsiiSTEBBINS' PHACELIANative
Phacelia stellarisBRAND'S STAR PHACELIANative
Phacelia suaveolensNative
Phacelia suaveolens subsp. keckii
(Under Phacelia keckii)
Synonym
Phacelia suaveolens var. keckii
(Under Phacelia keckii)
Synonym
Phacelia tanacetifoliaNative
Phacelia tanacetifolia var. cinerea
(Under Phacelia tanacetifolia)
Synonym
Phacelia tanacetifolia var. hubbyi
(Under Phacelia hubbyi)
Synonym
Phacelia tanacetifolia var. pseudo-distans
(Under Phacelia tanacetifolia)
Synonym
Phacelia tanacetifolia var. tenuifolia
(Under Phacelia distans)
Synonym
Phacelia tenuifolia
(Under Phacelia distans)
Synonym
Phacelia tetrameraNative
Phacelia thermalisNative
Phacelia umbrosaNative
Phacelia vallicolaMARIPOSA PHACELIANative
Phacelia vallis-mortaeNative
Phacelia vallis-mortae var. heliophila
(Under Phacelia vallis-mortae)
Mentioned in
a note
Phacelia virgata
(Under Phacelia heterophylla var. virgata)
Synonym
Phacelia virgata
(Under Phacelia imbricata var. bernardina)
Synonym
Phacelia virgata var. ampliata
(Under Phacelia heterophylla var. virgata)
Synonym
Phacelia viscidaNative
Phacelia viscida var. albifloraNative
Phacelia viscida var. viscidaNative
Phacelia whitlavia
(Under Phacelia minor)
Synonym
Phacelia whitlavia var. jonesii
(Under Phacelia minor)
Synonym
Phalacroseris
Phalacroseris bolanderiBOLANDER'S MOCK DANDELIONNative
Phalacroseris bolanderi var. coronata
(Under Phalacroseris bolanderi)
Synonym
Phalaris
  ↳  Key to Phalaris
CANARY GRASS
Phalaris americana
(Under Phalaris caroliniana)
Synonym
Phalaris amethystina
(Under Phalaris californica)
Synonym
Phalaris angustaTIMOTHY CANARY GRASSNative
Phalaris aquaticaHARDING GRASSNaturalized
Phalaris arundinaceaREED CANARY GRASSNative
Phalaris brachystachysSHORT-SPIKED CANARY GRASSNaturalized
Phalaris bulbosa
(Under Phalaris aquatica)
Synonym
Phalaris bulbosa
(Under Phalaris coerulescens)
Synonym
Phalaris californicaCALIFORNIA CANARY GRASSNative
Phalaris canariensisCANARY GRASSNaturalized
Phalaris carolinianaCAROLINA CANARY GRASSNaturalized
Phalaris coerulescensSUNOL GRASSNaturalized
Phalaris commutata
(Under Phalaris aquatica)
Synonym
Phalaris intermedia
(Under Phalaris caroliniana)
Synonym
Phalaris intermedia var. angusta
(Under Phalaris angusta)
Synonym
Phalaris intermedia var. angustata
(Under Phalaris angusta)
Synonym
Phalaris lemmoniiLEMMON'S CANARY GRASSNative
Phalaris microstachya
(Under Phalaris caroliniana)
Synonym
Phalaris minorLITTLE-SEEDED CANARY GRASSNaturalized
Phalaris occidentalis
(Under Phalaris caroliniana)
Synonym
Phalaris paradoxaHOOD CANARY GRASSNaturalized
Phalaris paradoxa var. coerulescens
(Under Phalaris coerulescens)
Synonym
Phalaris paradoxa var. praemorsa
(Under Phalaris paradoxa)
Synonym
Phalaris praemorsa
(Under Phalaris paradoxa)
Synonym
Phalaris stenoptera
(Under Phalaris aquatica)
Synonym
Phalaris trivialis
(Under Phalaris caroliniana)
Synonym
Phalaris tuberosa
(Under Phalaris aquatica)
Synonym
Phalaris tuberosa var. stenoptera
(Under Phalaris aquatica)
Synonym
PhaseolusWILD BEAN
Phaseolus carterae
(Under Phaseolus filiformis)
Synonym
Phaseolus coccineus
(Under Phaseolus)
Mentioned in
a note
Phaseolus filiformisSLENDER-STEM BEANNative
Phaseolus lunatus
(Under Phaseolus)
Mentioned in
a note
Phaseolus sanctorum
(Under Phaseolus filiformis)
Synonym
Phaseolus vulgaris
(Under Phaseolus)
Mentioned in
a note
Phaseolus wrightii
(Under Phaseolus filiformis)
Synonym
Philadelphus
  ↳  Key to Philadelphus
MOCK ORANGE
Philadelphus californicus
(Under Philadelphus lewisii)
Synonym
Philadelphus lewisiiWILD MOCK ORANGENative
Philadelphus lewisii subsp. californicus
(Under Philadelphus lewisii)
Synonym
Philadelphus lewisii subsp. gordonianus
(Under Philadelphus lewisii)
Synonym
Philadelphus microphyllusLITTLELEAF MOCK ORANGENative
Philadelphus microphyllus subsp. pumilus
(Under Philadelphus microphyllus)
Synonym
Philadelphus microphyllus subsp. stramineus
(Under Philadelphus microphyllus)
Synonym
Philadelphus microphyllus var. stramineus
(Under Philadelphus microphyllus)
Synonym
Philadelphus pumilus
(Under Philadelphus microphyllus)
Synonym
Philadelphus stramineus
(Under Philadelphus microphyllus)
Synonym
Philibertella hartwegii
(Under Funastrum cynanchoides var. hartwegii)
Synonym
Philibertia heterophylla
(Under Funastrum cynanchoides var. hartwegii)
Synonym
Philibertia hirtella
(Under Funastrum hirtellum)
Synonym
Philibertia linearis var. hirtella
(Under Funastrum hirtellum)
Synonym
Phleum
  ↳  Key to Phleum
TIMOTHY
Phleum alpinumALPINE TIMOTHY, MOUNTAIN TIMOTHYNative
Phleum pratenseCULTIVATED TIMOTHYNaturalized
Phlox
  ↳  Key to Phlox
Phlox adsurgensNative
Phlox austromontanaNative
Phlox austromontana subsp. austromontana
(Under Phlox austromontana)
Synonym
Phlox austromontana subsp. prostrata
(Under Phlox austromontana)
Synonym
Phlox azurea
(Under Phlox diffusa)
Synonym
Phlox bryoides
(Under Phlox muscoides)
Synonym
Phlox caespitosa
(Under Phlox douglasii)
Mentioned in
a note
Phlox caespitosa subsp. pulvinata
(Under Phlox pulvinata)
Synonym
Phlox caespitosa var. condensata
(Under Phlox condensata)
Synonym
Phlox condensataNative
Phlox covillei
(Under Phlox condensata)
Synonym
Phlox diffusaNative
Phlox dispersaHIGH SIERRA PHLOXNative
Phlox dolichanthaBIG BEAR VALLEY PHLOXNative
Phlox douglasiiNative
Phlox douglasii subsp. rigida
(Under Phlox douglasii)
Synonym
Phlox gracilis
(Under Microsteris gracilis)
Synonym
Phlox gracilis
(Under Phlox)
Mentioned in
a note
Phlox hirsutaYREKA PHLOXNative
Phlox hoodii subsp. canescensNative
Phlox hoodii subsp. lanata
(Under Phlox hoodii subsp. canescens)
Synonym
Phlox longifolia
(Under Phlox stansburyi)
Mentioned in
a note
Phlox muscoidesSQUARESTEM PHLOXNative
Phlox pulvinataNative
Phlox rigida
(Under Phlox douglasii)
Synonym
Phlox speciosaNative
Phlox speciosa subsp. nitida
(Under Phlox speciosa)
Synonym
Phlox speciosa subsp. occidentalis
(Under Phlox speciosa)
Synonym
Phlox stansburyiNative
Phlox stansburyi subsp. stansburyiNative
Phlox stansburyi subsp. superbaNative
Phlox stansburyi var. brevifoliaNative
Phoenicaulis
Phoenicaulis cheiranthoidesNative
Phoenicaulis cheiranthoides subsp. glabra
(Under Phoenicaulis cheiranthoides)
Synonym
Phoenicaulis cheiranthoides var. lanuginosa
(Under Phoenicaulis cheiranthoides)
Synonym
Phoenicaulis eurycarpa
(Under Anelsonia eurycarpa)
Synonym
Phoenix
  ↳  Key to Phoenix
Phoenix canariensisCANARY ISLAND PALMNaturalized
Phoenix dactyliferaDATE PALMWaif
Pholisma
  ↳  Key to Pholisma
Pholisma arenariumNative
Pholisma sonoraeSAND FOODNative
Pholistoma
  ↳  Key to Pholistoma
Pholistoma auritumNative
Pholistoma auritum var. arizonicumARIZONA PHOLISTOMANative
Pholistoma auritum var. auritumFIESTA FLOWERNative
Pholistoma membranaceumNative
Pholistoma racemosumNative
Phoradendron
  ↳  Key to Phoradendron
MISTLETOE
Phoradendron bolleanumNative
Phoradendron bolleanum subsp. densum
(Under Phoradendron bolleanum)
Synonym
Phoradendron bolleanum subsp. pauciflorum
(Under Phoradendron bolleanum)
Synonym
Phoradendron bolleanum var. densum
(Under Phoradendron bolleanum)
Synonym
Phoradendron bolleanum var. pauciflorum
(Under Phoradendron bolleanum)
Synonym
Phoradendron californicumDESERT MISTLETOENative
Phoradendron californicum var. distans
(Under Phoradendron californicum)
Synonym
Phoradendron californicum var. leucocarpum
(Under Phoradendron californicum)
Synonym
Phoradendron densum
(Under Phoradendron bolleanum)
Synonym
Phoradendron juniperinumJUNIPER or INCENSE CEDAR MISTLETOENative
Phoradendron juniperinum var. ligatum
(Under Phoradendron juniperinum)
Synonym
Phoradendron leucarpumAMERICAN MISTLETOENative
Phoradendron leucarpum subsp. macrophyllumNative
Phoradendron leucarpum subsp. tomentosumNative
Phoradendron libocedri
(Under Phoradendron juniperinum)
Synonym
Phoradendron macrophyllum
(Under Phoradendron leucarpum subsp. macrophyllum)
Synonym
Phoradendron pauciflorum
(Under Phoradendron bolleanum)
Synonym
Phoradendron serotinum
(Under Phoradendron leucarpum)
Synonym
Phoradendron serotinum
(Under Phoradendron)
Mentioned in
a note
Phoradendron serotinum subsp. macrophyllum
(Under Phoradendron leucarpum subsp. macrophyllum)
Synonym
Phoradendron serotinum subsp. tomentosum
(Under Phoradendron leucarpum subsp. tomentosum)
Synonym
Phoradendron villosum
(Under Phoradendron leucarpum subsp. tomentosum)
Synonym
PhragmitesCOMMON REED, CARRIZO
Phragmites australisCOMMON REEDNative
Phragmites australis subsp. americanus
(Under Phragmites australis)
Mentioned in
a note
Phragmites australis subsp. berlandieri
(Under Phragmites australis)
Mentioned in
a note
Phragmites australis var. berlandieri
(Under Phragmites australis)
Synonym
Phragmites berlandieri
(Under Phragmites australis)
Synonym
Phragmites communis
(Under Phragmites australis)
Synonym
Phragmites communis var. berlandieri
(Under Phragmites australis)
Synonym
PhrymaceaeLOPSEED FAMILY
Phyla
  ↳  Key to Phyla
Phyla lanceolataNative
Phyla nodifloraNative
Phyla nodiflora var. canescens
(Under Phyla nodiflora)
Synonym
Phyla nodiflora var. incisa
(Under Phyla nodiflora)
Synonym
Phyla nodiflora var. reptans
(Under Phyla nodiflora)
Synonym
Phyla nodiflora var. rosea
(Under Phyla nodiflora)
Synonym
Phyllodoce
  ↳  Key to Phyllodoce
MOUNTAIN HEATHER
Phyllodoce breweriNative
Phyllodoce empetriformisNative
Phyllogonum luteolum
(Under Gilmania luteola)
Synonym
Phyllospadix
  ↳  Key to Phyllospadix
SURF-GRASS
Phyllospadix scouleriNative
Phyllospadix torreyiNative
Phyllostachys
Phyllostachys aureaFISHPOLE BAMBOO, GOLDEN BAMBOOJfp-4
Phyllostachys bambusoides
(Under Poaceae (Gramineae))
Mentioned in
a note
Physalis
  ↳  Key to Physalis
GROUND-CHERRY
Physalis acutifoliaNative
Physalis angulata var. lancifolia
(Under Physalis lancifolia)
Synonym
Physalis crassifoliaNative
Physalis crassifolia var. versicolor
(Under Physalis crassifolia)
Synonym
Physalis fendleri
(Under Physalis hederifolia var. fendleri)
Synonym
Physalis greenei
(Under Physalis crassifolia)
Synonym
Physalis hederifoliaNative
Physalis hederifolia var. cordifolia
(Under Physalis hederifolia var. fendleri)
Synonym
Physalis hederifolia var. fendleriNative
Physalis hederifolia var. palmeriNative
Physalis ixocarpa
(Under Physalis philadelphica)
Synonym
Physalis lancifoliaNaturalized
Physalis lobataLOBED GROUND-CHERRYNative
Physalis longifoliaWaif
Physalis mollis
(Under Physalis viscosa)
Synonym
Physalis philadelphicaTOMATILLONaturalized
Physalis pruinosa
(Under Physalis pubescens var. grisea)
Synonym
Physalis pubescensNaturalized
Physalis pubescens var. griseaNaturalized
Physalis pubescens var. integrifoliaNaturalized
Physalis viscosaGRAPE GROUND-CHERRYWaif
Physalis viscosa var. cinerascens
(Under Physalis viscosa)
Synonym
Physaria
  ↳  Key to Physaria
BLADDERPOD
Physaria chambersiiCHAMBERS' PHYSARIANative
Physaria cordiformisNative
Physaria kingiiNative
Physaria kingii subsp. bernardinaSAN BERNARDINO MOUNTAINS BLADDERPODNative
Physaria kingii subsp. kingiiNative
Physaria kingii subsp. latifoliaNative
Physaria ludovicianaSILVER BLADDERPODNative
Physaria occidentalis subsp. cinerascens
(Under Physaria occidentalis subsp. occidentalis)
Mentioned in
a note
Physaria occidentalis subsp. occidentalisNative
Physaria tenellaNative
Physaria wardii
(Under Physaria kingii subsp. latifolia)
Synonym
Physocarpus
  ↳  Key to Physocarpus
NINEBARK
Physocarpus alternansNEVADA NINEBARKNative
Physocarpus alternans subsp. annulatus
(Under Physocarpus alternans)
Synonym
Physocarpus alternans subsp. panamintensis
(Under Physocarpus alternans)
Synonym
Physocarpus capitatusNative
Phytolacca
  ↳  Key to Phytolacca
Phytolacca americana var. americanaPOKEWEEDNaturalized
Phytolacca americana var. rigida
(Under Phytolacca americana var. americana)
Mentioned in
a note
Phytolacca heterotepalaMEXICAN POKEWEEDWaif
Phytolacca icosandraTROPICAL POKEWEEDNaturalized
Phytolacca octandra
(Under Phytolacca icosandra)
Mentioned in
a note
PhytolaccaceaePOKEWEED FAMILY
Picea
  ↳  Key to Picea
SPRUCE
Picea brewerianaBREWER SPRUCENative
Picea engelmanniiENGELMANN SPRUCENative
Picea sitchensisSITKA SPRUCENative
PickeringiaCHAPARRAL PEA
Pickeringia montana
  ↳  Key to Pickeringia montana
CHAPARRAL PEANative
Pickeringia montana var. montanaNative
Pickeringia montana var. tomentosaWOOLLY CHAPARRAL PEANative
Picradeniopsis
Picradeniopsis multifloraNative
Picris echioides
(Under Helminthotheca echioides)
Synonym
Picris echioides
(Under Asteraceae (Compositae))
Mentioned in
a note
PicrodendraceaeBITTER-TREE FAMILY
Picrothamnus desertorum
(Under Artemisia spinescens)
Synonym
Pilostyles
Pilostyles thurberiTHURBER'S PILOSTYLESNative
Pilularia
Pilularia americanaNative
Pimenta dioica
(Under Myrtaceae)
Mentioned in
a note
Pinaceae
  ↳  Key to Pinaceae
PINE FAMILY
Pinellia ternata
(Under Araceae)
Mentioned in
a note
PinguiculaBUTTERWORT
Pinguicula macrocerasHORNED BUTTERWORTNative
Pinguicula macroceras subsp. macroceras
(Under Pinguicula macroceras)
Synonym
Pinguicula macroceras subsp. nortensis
(Under Pinguicula macroceras)
Synonym
Pinguicula vulgaris
(Under Pinguicula macroceras)
Mentioned in
a note
Pinguicula vulgaris subsp. macroceras
(Under Pinguicula macroceras)
Synonym
Pinus
  ↳  Key to Pinus
PINE
Pinus albicaulisWHITEBARK PINENative
Pinus aristata
(Under Pinus longaeva)
Synonym
Pinus attenuataKNOBCONE PINENative
Pinus balfourianaFOXTAIL PINENative
Pinus balfouriana subsp. austrinaNative
Pinus balfouriana subsp. balfourianaNative
Pinus benthamiana
(Under Pinus ponderosa var. pacifica)
Synonym
Pinus californiarum
(Under Pinus monophylla)
Synonym
Pinus contortaNative
Pinus contorta subsp. bolanderiBOLANDER'S BEACH PINENative
Pinus contorta subsp. contortaSHORE PINENative
Pinus contorta subsp. murrayanaLODGEPOLE PINENative
Pinus coulteriCOULTER PINENative
Pinus edulisCOLORADO PINYONNative
Pinus flexilisLIMBER PINENative
Pinus jeffreyiJEFFREY PINENative
Pinus juarezensis
(Under Pinus quadrifolia)
Mentioned in
a note
Pinus lambertianaSUGAR PINENative
Pinus longaevaBRISTLECONE PINENative
Pinus monophyllaSINGLELEAF PINYON PINENative
Pinus monticolaWESTERN WHITE PINENative
Pinus muricataBISHOP PINENative
Pinus murrayana
(Under Pinus contorta subsp. murrayana)
Synonym
Pinus pinea
(Under Pinus)
Mentioned in
a note
Pinus ponderosaPONDEROSA PINE, WESTERN YELLOW PINENative
Pinus ponderosa subsp. benthamiana
(Under Pinus ponderosa var. pacifica)
Synonym
Pinus ponderosa var. benthamiana
(Under Pinus ponderosa var. pacifica)
Synonym
Pinus ponderosa var. pacificaPACIFIC PONDEROSA PINENative
Pinus ponderosa var. ponderosaNORTH PLATEAU PONDEROSA PINENative
Pinus ponderosa var. washoensisWASHOE PINENative
Pinus quadrifoliaPARRY PINYON PINENative
Pinus radiataMONTEREY PINENative
Pinus remorata
(Under Pinus muricata)
Synonym
Pinus sabinianaGRAY, GHOST, or FOOTHILL PINENative
Pinus torreyanaNative
Pinus torreyana subsp. insularisSANTA ROSA ISLAND TORREY PINENative
Pinus torreyana subsp. torreyanaTORREY PINENative
Pinus washoensis
(Under Pinus ponderosa var. washoensis)
Synonym
Pinus washoensis
(Under Pinus)
Mentioned in
a note
Piperia
  ↳  Key to Piperia
PIPERIA
Piperia candidaWHITE-FLOWERED REIN-ORCHIDNative
Piperia colemaniiCOLEMAN'S REIN-ORCHIDNative
Piperia cooperiCHAPARRAL REIN-ORCHIDNative
Piperia elegansNative
Piperia elegans subsp. decurtataPOINT REYES REIN-ORCHIDNative
Piperia elegans subsp. elegansCOAST PIPERIA, ELEGANT PIPERIANative
Piperia elongataCHAPARRAL ORCHID, WOOD REIN-ORCHIDNative
Piperia leptopetalaNARROW-PETALED REIN-ORCHIDNative
Piperia michaeliiMICHAEL'S REIN-ORCHIDNative
Piperia transversaFLAT SPURRED PIPERIANative
Piperia unalascensisALASKA PIPERIA, SLENDER-SPIRE ORCHIDNative
Piperia yadoniiYADON'S REIN-ORCHIDNative
Piptatherum exiguum
(Under Stipa exigua)
Synonym
Piptatherum micranthum
(Under Stipa divaricata)
Synonym
Piptatherum miliaceum
(Under Stipa miliacea var. miliacea)
Synonym
Piptatherum miliaceum subsp. miliaceum
(Under Stipa miliacea var. miliacea)
Synonym
Piptochaetium setosum
(Under Stipa purpurata)
Synonym
Piptochaetium stipoides
(Under Stipa chaetophora)
Synonym
PistaciaPISTACHIO
Pistacia atlanticaNaturalized
Pistacia texana
(Under Pistacia)
Mentioned in
a note
Pistacia vera
(Under Pistacia)
Mentioned in
a note
Pistacia vera
(Under Pistacia atlantica)
Mentioned in
a note
PistiaWATER-LETTUCE
Pistia stratiotesWaif
PisumPEA
Pisum sativumCOMMON PEANaturalized
Pisum sativum var. arvense
(Under Pisum sativum)
Synonym
Pithecellobium minutum
(Under Vachellia farnesiana var. minuta)
Synonym
Pittosporaceae
  ↳  Key to Pittosporaceae
PITTOSPORUM FAMILY
Pittosporum
  ↳  Key to Pittosporum
Pittosporum crassifoliumNaturalized
Pittosporum tenuifoliumWaif
Pittosporum tobiraJAPANESE PITTOSPORUM, MOCK ORANGENaturalized
Pittosporum undulatumVICTORIAN BOX, MOCK ORANGENaturalized
Pityopus
Pityopus californicusCALIFORNIA PINEFOOTNative
Pityrogramma triangularis var. maxonii
(Under Pentagramma maxonii)
Synonym
Pityrogramma triangularis var. pallida
(Under Pentagramma pallida)
Synonym
Pityrogramma triangularis var. triangularis
(Under Pentagramma triangularis)
Synonym
Pityrogramma triangularis var. viscosa
(Under Pentagramma viscosa)
Synonym
Plagiobothrys
  ↳  Key to Plagiobothrys
POPCORNFLOWER
Plagiobothrys acanthocarpusADOBE POPCORNFLOWERNative
Plagiobothrys arizonicusARIZONA POPCORNFLOWERNative
Plagiobothrys austinae
(Under Plagiobothrys austiniae)
Synonym
Plagiobothrys austiniaeAUSTIN'S SPINY-NUT POPCORNFLOWERNative
Plagiobothrys bracteatusBRACTED POPCORNFLOWERNative
Plagiobothrys bracteatus var. aculeolatus
(Under Plagiobothrys bracteatus)
Synonym
Plagiobothrys californicus
(Under Plagiobothrys collinus var. californicus)
Synonym
Plagiobothrys californicus var. fulvescens
(Under Plagiobothrys collinus var. fulvescens)
Synonym
Plagiobothrys californicus var. gracilis
(Under Plagiobothrys collinus var. gracilis)
Synonym
Plagiobothrys californicus var. ursinus
(Under Plagiobothrys collinus var. ursinus)
Synonym
Plagiobothrys canescensNative
Plagiobothrys canescens var. canescensVALLEY POPCORNFLOWERNative
Plagiobothrys canescens var. catalinensisSANTA CATALINA POPCORNFLOWERNative
Plagiobothrys chorisianusARTIST'S POPCORNFLOWERNative
Plagiobothrys chorisianus var. chorisianusCHORIS' POPCORNFLOWERNative
Plagiobothrys chorisianus var. hickmaniiHICKMAN'S POPCORNFLOWERNative
Plagiobothrys cognatusCOGNATE POPCORNFLOWERNative
Plagiobothrys collinusNative
Plagiobothrys collinus var. californicusCALIFORNIA POPCORNFLOWERNative
Plagiobothrys collinus var. fulvescensROUGH-STEMMED POPCORNFLOWERNative
Plagiobothrys collinus var. gracilisSAN DIEGO POPCORNFLOWERNative
Plagiobothrys collinus var. ursinusBEAR VALLEY POPCORNFLOWERNative
Plagiobothrys colorans
(Under Plagiobothrys tenellus)
Mentioned in
a note
Plagiobothrys cusickiiCUSICK'S POPCORNFLOWERNative
Plagiobothrys diffususSAN FRANCISCO POPCORNFLOWERNative
Plagiobothrys distantiflorusMADERA POPCORNFLOWERNative
Plagiobothrys foliaceus
(Under Plagiobothrys hispidus)
Synonym
Plagiobothrys fulvus var. campestrisFIELD POPCORNFLOWERNative
Plagiobothrys glaberHAIRLESS POPCORNFLOWERNative
Plagiobothrys glyptocarpusSCULPTURED-NUT POPCORNFLOWERNative
Plagiobothrys glyptocarpus var. glyptocarpusNative
Plagiobothrys glyptocarpus var. modestusCEDAR RIDGE POPCORNFLOWERNative
Plagiobothrys greeneiGREENE'S SPINY-NUT POPCORNFLOWERNative
Plagiobothrys hispidulusHARSH POPCORNFLOWERNative
Plagiobothrys hispidusCASCADE POPCORNFLOWER, BRISTLY POPCORNFLOWERNative
Plagiobothrys humistratusLOW POPCORNFLOWERNative
Plagiobothrys hystriculusBEARDED POPCORNFLOWERNative
Plagiobothrys infectivusDYE POPCORNFLOWERNative
Plagiobothrys jonesiiMOJAVE POPCORNFLOWERNative
Plagiobothrys kingiiGREAT BASIN POPCORNFLOWERNative
Plagiobothrys kingii var. harknessiiNORTHERN GREAT BASIN POPCORNFLOWERNative
Plagiobothrys kingii var. kingiiSOUTHERN GREAT BASIN POPCORNFLOWERNative
Plagiobothrys leptocladusALKALI PLAGIOBOTHRYSNative
Plagiobothrys lithocaryusMAYACAMAS POPCORNFLOWERNative
Plagiobothrys mollisCREEPING POPCORNFLOWER, SOFT POPCORNFLOWERNative
Plagiobothrys mollis var. mollisNative
Plagiobothrys mollis var. vestitusPETALUMA POPCORNFLOWERNative
Plagiobothrys myosotoides
(Under Plagiobothrys verrucosus)
Synonym
Plagiobothrys myosotoides subsp. verrucosus
(Under Plagiobothrys verrucosus)
Synonym
Plagiobothrys nitensSHINY-NUTLET POPCORNFLOWERNative
Plagiobothrys nothofulvusRUSTY POPCORNFLOWER, FOOTHILL SNOWDROPSNative
Plagiobothrys parishiiPARISH'S POPCORNFLOWERNative
Plagiobothrys reticulatusTRACY'S POPCORNFLOWERNative
Plagiobothrys reticulatus var. reticulatusNative
Plagiobothrys reticulatus var. rossianorumFORT ROSS POPCORNFLOWERNative
Plagiobothrys salsusDESERT POPCORNFLOWERNative
Plagiobothrys scouleri
(Under Plagiobothrys cognatus)
Mentioned in
a note
Plagiobothrys scouleri var. cusickii
(Under Plagiobothrys cusickii)
Synonym
Plagiobothrys scouleri var. hispidulus
(Under Plagiobothrys hispidulus)
Synonym
Plagiobothrys scouleri var. penicillatus
(Under Plagiobothrys cognatus)
Synonym
Plagiobothrys scouleri var. penicillatus
(Under Plagiobothrys cusickii)
Synonym
Plagiobothrys scouleri var. penicillatus
(Under Plagiobothrys hispidulus)
Synonym
Plagiobothrys scouleri var. penicillatus
(Under Plagiobothrys nitens)
Synonym
Plagiobothrys scouleri var. penicillatus
(Under Plagiobothrys reticulatus var. rossianorum)
Synonym
Plagiobothrys scriptusSCRIDGEE'S POPCORNFLOWERNative
Plagiobothrys shastensisSHASTA POPCORNFLOWERNative
Plagiobothrys stipitatusGREAT VALLEY POPCORNFLOWERNative
Plagiobothrys stipitatus var. micranthusNative
Plagiobothrys stipitatus var. stipitatusSHOWY GREAT VALLEY POPCORNFLOWERNative
Plagiobothrys strictusCALISTOGA POPCORNFLOWERNative
Plagiobothrys tenellusPACIFIC POPCORNFLOWERNative
Plagiobothrys tenerSLENDER POPCORNFLOWERNative
Plagiobothrys tener var. subglaberSERPENTINE POPCORNFLOWERNative
Plagiobothrys tener var. tenerNative
Plagiobothrys torreyiHIGH SIERRA POPCORNFLOWERNative
Plagiobothrys torreyi var. diffususNative
Plagiobothrys torreyi var. perplexansCHAPARRAL POPCORNFLOWERNative
Plagiobothrys torreyi var. torreyiYOSEMITE POPCORNFLOWERNative
Plagiobothrys trachycarpusROUGH-NUTLET POPCORNFLOWERNative
Plagiobothrys uncinatusHOOKED POPCORNFLOWERNative
Plagiobothrys undulatusWAVY-STEMMED POPCORNFLOWERNative
Plagiobothrys verrucosusFORGET-ME-NOT POPCORNFLOWERNative
Plagobothrys shastensis
(Under Plagiobothrys tenellus)
Mentioned in
a note
Planodes
Planodes virginicaNaturalized
Planodes virginicum
(Under Sibara)
Mentioned in
a note
Plantaginaceae
  ↳  Key to Plantaginaceae
PLANTAIN FAMILY
Plantago
  ↳  Key to Plantago
PLANTAIN
Plantago afra
(Under Plantago)
Mentioned in
a note
Plantago arenariaNaturalized
Plantago aristataNaturalized
Plantago bigelovii
(Under Plantago elongata)
Synonym
Plantago bigelovii subsp. bigelovii
(Under Plantago elongata)
Synonym
Plantago bigelovii subsp. californica
(Under Plantago elongata)
Synonym
Plantago bigelovii subsp. californica
(Under Plantago erecta)
Synonym
Plantago coronopusNaturalized
Plantago elongataNative
Plantago elongata subsp. elongata
(Under Plantago elongata)
Synonym
Plantago elongata subsp. pentasperma
(Under Plantago elongata)
Synonym
Plantago erectaNative
Plantago erecta subsp. rigidior
(Under Plantago erecta)
Synonym
Plantago eriopodaNative
Plantago fastigiata
(Under Plantago ovata var. fastigiata)
Synonym
Plantago heterophylla
(Under Plantago)
Mentioned in
a note
Plantago hirtella var. galeottiana
(Under Plantago subnuda)
Synonym
Plantago hookeriana var. californica
(Under Plantago erecta)
Synonym
Plantago indica
(Under Plantago arenaria)
Synonym
Plantago insularis
(Under Plantago ovata var. insularis)
Synonym
Plantago insularis var. fastigiata
(Under Plantago ovata var. fastigiata)
Synonym
Plantago lanceolataENGLISH PLANTAINNaturalized
Plantago majorCOMMON PLANTAINNaturalized
Plantago major var. pilgeri
(Under Plantago major)
Synonym
Plantago major var. scopulorum
(Under Plantago major)
Synonym
Plantago maritimaNative
Plantago maritima var. californica
(Under Plantago maritima)
Synonym
Plantago maritima var. juncoides
(Under Plantago maritima)
Synonym
Plantago maritima var. maritima
(Under Plantago maritima)
Synonym
Plantago ovataNative
Plantago ovata var. fastigiataNative
Plantago ovata var. insularisNative
Plantago patagonicaNative
Plantago psyllium
(Under Plantago arenaria)
Synonym
Plantago purshii
(Under Plantago patagonica)
Synonym
Plantago purshii var. oblonga
(Under Plantago patagonica)
Synonym
Plantago purshii var. picta
(Under Plantago patagonica)
Synonym
Plantago pusillaNaturalized
Plantago rhodospermaNative
Plantago sempervirens
(Under Plantago)
Mentioned in
a note
Plantago subnudaNative
Plantago truncata subsp. firmaNaturalized
Plantago virginicaNaturalized
PlatanaceaePLANE-TREE or SYCAMORE FAMILY
Platanthera
  ↳  Key to Platanthera
BOG-ORCHID
Platanthera dilatata
(Under Platanthera)
Mentioned in
a note
Platanthera dilatata var. leucostachysWHITE-FLOWERED BOG-ORCHIDNative
Platanthera foetida
(Under Piperia unalascensis)
Synonym
Platanthera gracilis
(Under Platanthera stricta)
Synonym
Platanthera huronensis
(Under Platanthera)
Mentioned in
a note
Platanthera hyperborea
(Under Platanthera tescamnis)
Synonym
Platanthera hyperborea
(Under Platanthera)
Mentioned in
a note
Platanthera hyperborea var. purpurascens
(Under Platanthera yosemitensis)
Synonym
Platanthera leucostachys
(Under Platanthera dilatata var. leucostachys)
Synonym
Platanthera purpurascens
(Under Platanthera yosemitensis)
Synonym
Platanthera sparsifloraSPARSE-FLOWERED BOG-ORCHIDNative
Platanthera strictaSLENDER BOG-ORCHIDNative
Platanthera tescamnisNative
Platanthera yosemitensisYOSEMITE BOG-ORCHIDNative
Platanus
  ↳  Key to Platanus
Platanus ×acerifolia (Aiton) Willd.
(Under Platanus ×hispanica)
Synonym
Platanus ×hispanicaLONDON PLANE TREEWaif
Platanus ×hybrida Brot.
(Under Platanus ×hispanica)
Synonym
Platanus hispanica
(Under Platanus ×hispanica)
Synonym
Platanus occidentalis
(Under Platanus ×hispanica)
Mentioned in
a note
Platanus orientalis
(Under Platanus ×hispanica)
Mentioned in
a note
Platanus racemosaWESTERN SYCAMORENative
Platanus racemosa var. wrightii
(Under Platanus racemosa)
Mentioned in
a note
Platanus wrightii
(Under Platanus racemosa)
Mentioned in
a note
Platystemon
Platystemon californicusCREAM CUPSNative
Platystemon californicus var. ciliatus
(Under Platystemon californicus)
Synonym
Platystemon californicus var. crinitus
(Under Platystemon californicus)
Synonym
Platystemon californicus var. horridulus
(Under Platystemon californicus)
Synonym
Platystemon californicus var. nutans
(Under Platystemon californicus)
Synonym
Platystemon californicus var. ornithopus
(Under Platystemon californicus)
Synonym
Platystemon californicus var. sphaerocarpus
(Under Platystemon californicus)
Synonym
Platystemon crinitus
(Under Platystemon californicus)
Synonym
Platystigma linearis
(Under Hesperomecon linearis)
Synonym
Plecostachys
Plecostachys serpyllifoliaPETITE-LICORICENaturalized
Plectritis
  ↳  Key to Plectritis
Plectritis brachystemon
(Under Plectritis congesta subsp. brachystemon)
Synonym
Plectritis ciliosaNative
Plectritis ciliosa subsp. ciliosa
(Under Plectritis ciliosa)
Synonym
Plectritis ciliosa subsp. insignis
(Under Plectritis ciliosa)
Synonym
Plectritis congestaNative
Plectritis congesta subsp. brachystemonNative
Plectritis congesta subsp. congestaSEA BLUSHNative
Plectritis congesta subsp. nitida
(Under Plectritis congesta subsp. brachystemon)
Synonym
Plectritis eichleriana
(Under Plectritis macrocera)
Synonym
Plectritis jepsonii
(Under Plectritis macrocera)
Synonym
Plectritis macroceraNative
Plectritis macrocera var. collina
(Under Plectritis macrocera)
Synonym
Plectritis macrocera var. grayi
(Under Plectritis macrocera)
Synonym
Plectritis macrocera var. mamillata
(Under Plectritis macrocera)
Synonym
Plectritis magna var. nitida
(Under Plectritis congesta subsp. brachystemon)
Synonym
Pleiacanthus
Pleiacanthus spinosusTHORNY SKELETONWEEDNative
Pleuraphis jamesii
(Under Hilaria jamesii)
Synonym
Pleuraphis rigida
(Under Hilaria rigida)
Synonym
Pleuricospora
Pleuricospora fimbriolataNative
PleurocoronisARROWLEAF
Pleurocoronis plurisetaNative
Pleuropogon
  ↳  Key to Pleuropogon
SEMAPHORE GRASS
Pleuropogon californicusNative
Pleuropogon californicus var. californicusNative
Pleuropogon californicus var. davyiDAVY'S SEMAPHORE GRASSNative
Pleuropogon davyi
(Under Pleuropogon californicus var. davyi)
Synonym
Pleuropogon hooverianusNORTH COAST SEMAPHORE GRASSNative
Pleuropogon refractusNODDING SEMAPHORE GRASSNative
Pluchea
  ↳  Key to Pluchea
Pluchea odorata var. odorataSALTMARSH-FLEABANENative
Pluchea sericeaARROW-WEEDNative
Plumbaginaceae
  ↳  Key to Plumbaginaceae
LEADWORT FAMILY
PlumbagoLEADWORT
Plumbago auriculataCAPE LEADWORTWaif
Pneumonanthe newberryi var. tiogana
(Under Gentiana newberryi var. tiogana)
Synonym
Poa
  ↳  Key to Poa
BLUE GRASS
Poa ×limosa Scribn. & T. A. Williams
(Under Poa secunda subsp. juncifolia)
Synonym
Poa abbreviataDWARF BLUE GRASSNative
Poa abbreviata subsp. marshiiMARSH'S BLUE GRASSNative
Poa abbreviata subsp. pattersoniiPATTERSON'S BLUE GRASSNative
Poa alpina var. purpurascens
(Under Poa cusickii subsp. purpurascens)
Synonym
Poa ampla
(Under Poa secunda subsp. juncifolia)
Mentioned in
a note
Poa annuaANNUAL BLUE GRASSNaturalized
Poa atropurpureaSAN BERNARDINO BLUE GRASSNative
Poa bigeloviiNative
Poa bolanderiNative
Poa bolanderi var. howellii
(Under Poa howellii)
Synonym
Poa bulbosaNaturalized
Poa bulbosa subsp. bulbosaWaif
Poa bulbosa subsp. viviparaNaturalized
Poa bulbosa var. bulbosa
(Under Poa bulbosa subsp. bulbosa)
Synonym
Poa bulbosa var. vivipara
(Under Poa bulbosa subsp. vivipara)
Synonym
Poa canbyi
(Under Poa secunda subsp. secunda)
Synonym
Poa compressaCANADIAN BLUE GRASSNaturalized
Poa confinisBEACH BLUE GRASSNative
Poa cusickiiNative
Poa cusickii subsp. cusickiiNative
Poa cusickii subsp. epilisSKYLINE BLUE GRASSNative
Poa cusickii subsp. pallidaNative
Poa cusickii subsp. purpurascensNative
Poa diaboliDIABLO CANYON BLUE GRASSNative
Poa douglasiiSAND DUNE BLUE GRASSNative
Poa douglasii subsp. macrantha
(Under Poa macrantha)
Synonym
Poa epilis
(Under Poa cusickii subsp. epilis)
Synonym
Poa fendlerianaNative
Poa fendleriana subsp. fendlerianaMUTTON GRASSNative
Poa fendleriana subsp. longiligulaLONG-TONGUE MUTTON GRASSNative
Poa fibrata
(Under Poa secunda subsp. juncifolia)
Mentioned in
a note
Poa glauca
(Under Poa glauca subsp. rupicola)
Mentioned in
a note
Poa glauca subsp. rupicolaTIMBERLINE BLUE GRASSNative
Poa gracillima
(Under Poa secunda subsp. secunda)
Synonym
Poa hansenii
(Under Poa cusickii subsp. cusickii)
Synonym
Poa hansenii
(Under Poa stebbinsii)
Mentioned in
a note
Poa howelliiNative
Poa incurva
(Under Poa secunda subsp. secunda)
Synonym
Poa infirmaWEAK BLUE GRASSNaturalized
Poa juncifolia
(Under Poa secunda subsp. juncifolia)
Mentioned in
a note
Poa keckiiNative
Poa kelloggiiKELLOGG'S BLUE GRASSNative
Poa leibergii
(Under Poa stebbinsii)
Mentioned in
a note
Poa lemmonii
(Under Puccinellia lemmonii)
Synonym
Poa leptocoma subsp. leptocomaBOG BLUE GRASSNative
Poa lettermaniiLETTERMAN'S BLUE GRASSNative
Poa longiligula
(Under Poa fendleriana subsp. longiligula)
Synonym
Poa macranthaSEASHORE BLUE GRASSNative
Poa napensisNAPA BLUE GRASSNative
Poa nemoralisWOOD BLUE GRASSNaturalized
Poa nemoralis subsp. nemoralis
(Under Poa nemoralis)
Synonym
Poa nervosa
(Under Poa wheeleri)
Synonym
Poa nevadensis
(Under Poa secunda subsp. juncifolia)
Mentioned in
a note
Poa palustrisFOWL BLUE GRASSNaturalized
Poa pattersonii
(Under Poa abbreviata subsp. pattersonii)
Synonym
Poa piperiPIPER'S BLUE GRASSNative
Poa pratensis
(Under Poa secunda subsp. juncifolia)
Mentioned in
a note
Poa pratensis subsp. agassizensis
(Under Poa pratensis subsp. pratensis)
Mentioned in
a note
Poa pratensis subsp. angustifolia
(Under Poa pratensis subsp. pratensis)
Mentioned in
a note
Poa pratensis subsp. juncifolia
(Under Poa secunda subsp. juncifolia)
Mentioned in
a note
Poa pratensis subsp. pratensisKENTUCKY BLUE GRASSNaturalized
Poa pringleiNative
Poa purpurascens
(Under Poa cusickii subsp. purpurascens)
Synonym
Poa rhizomataTIMBER BLUE GRASSNative
Poa rhizomata
(Under Poa piperi)
Synonym
Poa rupicola
(Under Poa glauca subsp. rupicola)
Synonym
Poa sandbergii
(Under Poa secunda subsp. secunda)
Synonym
Poa scabrella
(Under Poa secunda subsp. secunda)
Synonym
Poa secundaNEVADA BLUE GRASSNative
Poa secunda subsp. juncifoliaNative
Poa secunda subsp. secundaONE-SIDED BLUE GRASSNative
Poa sierraeSIERRA BLUE GRASSNative
Poa stebbinsiiNative
Poa subaristata
(Under Poa cusickii subsp. pallida)
Synonym
Poa suksdorfii
(Under Poa keckii)
Synonym
Poa tenerrimaDELICATE BLUE GRASSNative
Poa trivialisROUGH BLUE GRASSNaturalized
Poa unilateralis subsp. unilateralisSAN FRANCISCO BLUE GRASSNative
Poa wheeleriNative
Poaceae (Gramineae)
  ↳  Key to Poaceae (Gramineae)
GRASS FAMILY
Podagrostis humilis
(Under Agrostis humilis)
Synonym
Podagrostis thurberiana
(Under Agrostis humilis)
Synonym
Podistera
Podistera nevadensisSIERRA PODISTERANative
Pogogyne
  ↳  Key to Pogogyne
BEARDSTYLE, MESA MINT
Pogogyne abramsiiSAN DIEGO MESA MINTNative
Pogogyne clareanaSANTA LUCIA MINTNative
Pogogyne douglasiiDOUGLAS' BEARDSTYLENative
Pogogyne douglasii subsp. parviflora
(Under Pogogyne douglasii)
Mentioned in
a note
Pogogyne floribundaPROFUSE-FLOWERED POGOGYNENative
Pogogyne nudiusculaOTAY MESA MINTNative
Pogogyne serpylloidesTHYMELEAF BEARDSTYLENative
Pogogyne serpylloides subsp. intermedia
(Under Pogogyne serpylloides)
Synonym
Pogogyne tenuiflora
(Under Pogogyne)
Mentioned in
a note
Pogogyne zizyphoroidesSACRAMENTO BEARDSTYLENative
Poinciana gilliesii
(Under Caesalpinia gilliesii)
Synonym
Poinciana spinosa
(Under Caesalpinia spinosa)
Synonym
Polanisia
Polanisia dodecandra subsp. dodecandra
(Under Polanisia dodecandra subsp. trachysperma)
Mentioned in
a note
Polanisia dodecandra subsp. trachyspermaWESTERN CLAMMYWEEDNative
Polanisia trachysperma
(Under Polanisia dodecandra subsp. trachysperma)
Synonym
Polemoniaceae
  ↳  Key to Polemoniaceae
PHLOX FAMILY
Polemonium
  ↳  Key to Polemonium
Polemonium californicumNative
Polemonium carneumOREGON POLEMONIUMNative
Polemonium chartaceumMASON'S SKY PILOTNative
Polemonium eddyenseMOUNT EDDY SKY PILOTNative
Polemonium eximiumNative
Polemonium micranthumNative
Polemonium occidentaleNative
Polemonium occidentale subsp. occidentale
(Under Polemonium occidentale)
Synonym
Polemonium pulcherrimumNative
Polemonium pulcherrimum var. pulcherrimumNative
Polemonium pulcherrimum var. shastenseNative
Polemonium shastense
(Under Polemonium pulcherrimum var. shastense)
Synonym
Poliomintha
Poliomintha incanaFROSTED MINTNative
Polycarpon
  ↳  Key to Polycarpon
POLYCARP
Polycarpon depressumNative
Polycarpon tetraphyllum var. tetraphyllumFOUR-LEAVED ALLSEEDNaturalized
Polyctenium
Polyctenium fremontiiNative
Polyctenium fremontii var. confertum
(Under Polyctenium fremontii)
Synonym
Polyctenium fremontii var. fremontii
(Under Polyctenium fremontii)
Synonym
Polyctenium williamsiae
(Under Polyctenium fremontii)
Synonym
Polygala
  ↳  Key to Polygala
MILKWORT
Polygala acanthocladaTHORNY MILKWORTNative
Polygala acanthoclada var. intricata
(Under Polygala intermontana)
Synonym
Polygala californicaCALIFORNIA MILKWORTNative
Polygala cornutaNative
Polygala cornuta subsp. fishiae
(Under Polygala cornuta var. fishiae)
Synonym
Polygala cornuta var. cornutaSIERRA MILKWORTNative
Polygala cornuta var. fishiaeFISH'S MILKWORTNative
Polygala cornuta var. pollardii
(Under Polygala cornuta var. fishiae)
Mentioned in
a note
Polygala heterorhynchaNOTCH-BEAKED MILKWORTNative
Polygala intermontanaINTERMOUNTAIN MILKWORTNative
Polygala subspinosaSPINY MILKWORTNative
Polygala subspinosa var. heterorhyncha
(Under Polygala heterorhyncha)
Synonym
PolygalaceaeMILKWORT FAMILY
Polygonaceae
  ↳  Key to Polygonaceae
BUCKWHEAT FAMILY
Polygonum
  ↳  Key to Polygonum
KNOTWEED
Polygonum aequale
(Under Polygonum aviculare subsp. depressum)
Synonym
Polygonum amphibium
(Under Persicaria amphibia)
Synonym
Polygonum amphibium var. emersum
(Under Persicaria amphibia)
Synonym
Polygonum amphibium var. stipulaceum
(Under Persicaria amphibia)
Synonym
Polygonum arenastrum
(Under Polygonum aviculare subsp. depressum)
Synonym
Polygonum argyrocoleonPERSIAN KNOTWEEDNaturalized
Polygonum aubertii
(Under Fallopia baldschuanica)
Synonym
Polygonum austiniaeMRS. AUSTIN'S KNOTWEEDNative
Polygonum aviculareKNOTWEED, KNOTGRASSNaturalized
Polygonum aviculare subsp. aviculareNaturalized
Polygonum aviculare subsp. buxiformeWaif
Polygonum aviculare subsp. depressumNaturalized
Polygonum aviculare subsp. neglectumWaif
Polygonum aviculare subsp. rectum
(Under Polygonum aviculare subsp. neglectum)
Synonym
Polygonum aviculare subsp. rurivagumWaif
Polygonum aviculare subsp. rurivagum
(Under Polygonum aviculare subsp. rurivagum)
Synonym
Polygonum baldschuanicum
(Under Fallopia baldschuanica)
Synonym
Polygonum bidwelliaeBIDWELL'S KNOTWEEDNative
Polygonum bistortoides
(Under Bistorta bistortoides)
Synonym
Polygonum bolanderiBOLANDER'S KNOTWEEDNative
Polygonum buxiforme
(Under Polygonum aviculare subsp. buxiforme)
Synonym
Polygonum calcatum
(Under Polygonum aviculare subsp. depressum)
Synonym
Polygonum californicumNative
Polygonum capitatum
(Under Persicaria capitata)
Synonym
Polygonum confertiflorum
(Under Polygonum polygaloides subsp. confertiflorum)
Synonym
Polygonum convolvulus
(Under Fallopia convolvulus)
Synonym
Polygonum cuspidatum
(Under Fallopia japonica)
Synonym
Polygonum davisiae
(Under Aconogonon davisiae)
Synonym
Polygonum douglasiiDOUGLAS' KNOTWEEDNative
Polygonum douglasii subsp. austiniae
(Under Polygonum austiniae)
Synonym
Polygonum douglasii subsp. douglasii
(Under Polygonum douglasii)
Synonym
Polygonum douglasii subsp. johnstonii
(Under Polygonum sawatchense subsp. sawatchense)
Synonym
Polygonum douglasii subsp. majus
(Under Polygonum majus)
Synonym
Polygonum douglasii subsp. spergulariiforme
(Under Polygonum spergulariiforme)
Synonym
Polygonum douglasii var. johnstonii
(Under Polygonum sawatchense subsp. sawatchense)
Synonym
Polygonum douglasii var. latifolium
(Under Polygonum douglasii)
Synonym
Polygonum emaciatum
(Under Polygonum douglasii)
Synonym
Polygonum esotericum
(Under Polygonum polygaloides subsp. esotericum)
Synonym
Polygonum exile
(Under Polygonum sawatchense subsp. sawatchense)
Synonym
Polygonum exsertum
(Under Polygonum ramosissimum subsp. ramosissimum)
Synonym
Polygonum fowleri subsp. fowleriWaif
Polygonum fowleri var. fowleri
(Under Polygonum fowleri subsp. fowleri)
Mentioned in
a note
Polygonum fusiforme
(Under Persicaria maculosa)
Synonym
Polygonum hickmaniiSCOTTS VALLEY POLYGONUMNative
Polygonum hydropiper
(Under Persicaria hydropiper)
Synonym
Polygonum hydropiperoides
(Under Persicaria hydropiperoides)
Synonym
Polygonum hydropiperoides var. asperifolia
(Under Persicaria hydropiperoides)
Synonym
Polygonum interior
(Under Polygonum ramosissimum subsp. ramosissimum)
Synonym
Polygonum kelloggii
(Under Polygonum polygaloides subsp. kelloggii)
Synonym
Polygonum kelloggii
(Under Polygonum polygaloides)
Mentioned in
a note
Polygonum kelloggii var. confertiflorum
(Under Polygonum polygaloides subsp. confertiflorum)
Synonym
Polygonum lapathifolium
(Under Persicaria lapathifolia)
Synonym
Polygonum lapathifolium var. salicifolium
(Under Persicaria lapathifolia)
Synonym
Polygonum latum
(Under Polygonum ramosissimum subsp. ramosissimum)
Synonym
Polygonum leptocarpum
(Under Polygonum ramosissimum subsp. ramosissimum)
Synonym
Polygonum majusWIRY KNOTWEEDNative
Polygonum marinenseMARIN KNOTWEEDNative
Polygonum microspermum
(Under Polygonum aviculare subsp. depressum)
Synonym
Polygonum minimumNative
Polygonum montanum
(Under Polygonum douglasii)
Synonym
Polygonum montereyense
(Under Polygonum aviculare subsp. depressum)
Mentioned in
a note
Polygonum neglectum
(Under Polygonum aviculare subsp. neglectum)
Synonym
Polygonum newberryi
(Under Aconogonon newberryi)
Synonym
Polygonum omissum
(Under Persicaria pensylvanica)
Synonym
Polygonum paronychiaNative
Polygonum parryiPARRY'S or PRICKLY KNOTWEEDNative
Polygonum patulum
(Under Polygonum ramosissimum)
Synonym
Polygonum pensylvanicum
(Under Persicaria pensylvanica)
Synonym
Polygonum pensylvanicum var. durum
(Under Persicaria pensylvanica)
Synonym
Polygonum pensylvanicum var. eglandulosum
(Under Persicaria pensylvanica)
Synonym
Polygonum pensylvanicum var. laevigatum
(Under Persicaria pensylvanica)
Synonym
Polygonum pensylvanicum var. nesophilum
(Under Persicaria pensylvanica)
Synonym
Polygonum pensylvanicum var. rosiflorum
(Under Persicaria pensylvanica)
Synonym
Polygonum persicaria
(Under Persicaria maculosa)
Synonym
Polygonum phytolaccifolium
(Under Aconogonon phytolaccifolium)
Synonym
Polygonum polygaloidesPOLYGALA KNOTWEEDNative
Polygonum polygaloides subsp. confertiflorumNative
Polygonum polygaloides subsp. confertiflorum
(Under Polygonum polygaloides subsp. confertiflorum)
Synonym
Polygonum polygaloides subsp. esotericumMODOC COUNTY KNOTWEEDNative
Polygonum polygaloides subsp. kelloggiiNative
Polygonum polygaloides subsp. polygaloides
(Under Polygonum polygaloides)
Mentioned in
a note
Polygonum polystachyum
(Under Persicaria wallichii)
Synonym
Polygonum prolificum
(Under Polygonum ramosissimum subsp. prolificum)
Synonym
Polygonum punctatum
(Under Persicaria punctata)
Synonym
Polygonum punctatum var. confertiflorum
(Under Persicaria punctata)
Synonym
Polygonum punctatum var. ellipticum
(Under Persicaria punctata)
Synonym
Polygonum punctatum var. leptostachyum
(Under Persicaria punctata)
Synonym
Polygonum punctatum var. parviflorum
(Under Persicaria punctata)
Synonym
Polygonum puritanorum
(Under Persicaria maculosa)
Synonym
Polygonum ramosissimumBUSHY KNOTWEEDNative
Polygonum ramosissimum subsp. prolificumNaturalized
Polygonum ramosissimum subsp. ramosissimumNative
Polygonum ramosissimum var. prolificum
(Under Polygonum ramosissimum subsp. prolificum)
Synonym
Polygonum rurivagum
(Under Polygonum aviculare subsp. rurivagum)
Synonym
Polygonum sachalinense
(Under Fallopia sachalinensis)
Synonym
Polygonum sawatchenseNative
Polygonum sawatchense subsp. obliviumNative
Polygonum sawatchense subsp. sawatchenseNative
Polygonum scabrum
(Under Persicaria lapathifolia)
Synonym
Polygonum sect
(Under Aconogonon)
Synonym
Polygonum shastenseNative
Polygonum spergulariiformeNative
Polygonum stevensii
(Under Polygonum ramosissimum subsp. ramosissimum)
Synonym
Polygonum torreyi
(Under Polygonum minimum)
Synonym
Polygonum triandrum
(Under Polygonum sawatchense subsp. sawatchense)
Synonym
Polygonum triangulum
(Under Polygonum ramosissimum subsp. ramosissimum)
Synonym
Polygonum unifolium
(Under Polygonum polygaloides subsp. kelloggii)
Synonym
Polygonum watsonii
(Under Polygonum polygaloides subsp. confertiflorum)
Synonym
PolypodiaceaePOLYPODY FAMILY
Polypodium
  ↳  Key to Polypodium
POLYPODY
Polypodium australe
(Under Polypodium)
Mentioned in
a note
Polypodium californicumCALIFORNIA POLYPODYNative
Polypodium calirhizaNative
Polypodium glycyrrhizaLICORICE FERNNative
Polypodium hesperiumWESTERN POLYPODYNative
Polypodium scouleriLEATHER-LEAF FERNNative
Polypodium vulgare var. columbianum
(Under Polypodium hesperium)
Synonym
Polypogon
  ↳  Key to Polypogon
BEARD GRASS
Polypogon australisCHILEAN BEARD GRASSNaturalized
Polypogon elongatus
(Under Polypogon imberbis)
Synonym
Polypogon fugax
(Under Polypogon)
Mentioned in
a note
Polypogon imberbisNaturalized
Polypogon interruptusDITCH BEARD GRASSNaturalized
Polypogon maritimusMEDITERRANEAN BEARD GRASSNaturalized
Polypogon monspeliensisANNUAL BEARD GRASS, RABBITFOOT GRASSNaturalized
Polypogon semiverticillatus
(Under Polypogon viridis)
Synonym
Polypogon viridisWATER BEARD GRASSNaturalized
Polystichum
  ↳  Key to Polystichum
SWORD FERN
Polystichum californicumNative
Polystichum dudleyiNative
Polystichum imbricansNative
Polystichum imbricans subsp. curtumNative
Polystichum imbricans subsp. imbricansNative
Polystichum kruckebergiiKRUCKEBERG'S SWORD FERNNative
Polystichum lemmoniiNative
Polystichum lonchitisHOLLY FERNNative
Polystichum munitumWESTERN SWORD FERNNative
Polystichum munitum subsp. imbricans
(Under Polystichum imbricans subsp. imbricans)
Synonym
Polystichum munitum subsp. nudatum
(Under Polystichum imbricans subsp. imbricans)
Synonym
Polystichum scopulinumNative
Pontederia cordata
(Under Pontederiaceae)
Mentioned in
a note
Pontederiaceae
  ↳  Key to Pontederiaceae
PICKEREL-WEED FAMILY
Populus
  ↳  Key to Populus
COTTONWOOD
Populus albaWHITE POPLARNaturalized
Populus angustifoliaNARROW-LEAVED COTTONWOODNative
Populus balsamifera subsp. trichocarpa
(Under Populus trichocarpa)
Synonym
Populus deltoides
(Under Populus nigra)
Mentioned in
a note
Populus deltoides var. fremontii
(Under Populus fremontii subsp. fremontii)
Synonym
Populus fremontii
(Under Populus nigra)
Mentioned in
a note
Populus fremontii
(Under Populus trichocarpa)
Mentioned in
a note
Populus fremontii subsp. fremontiiALAMO or FREMONT COTTONWOODNative
Populus fremontii var. arizonica
(Under Populus fremontii subsp. fremontii)
Synonym
Populus fremontii var. macdougalii
(Under Populus fremontii subsp. fremontii)
Synonym
Populus nigraBLACK POPLAR, LOMBARDY POPLARNaturalized
Populus nigra var. italica
(Under Populus nigra)
Synonym
Populus nigra var. nigra
(Under Populus nigra)
Mentioned in
a note
Populus tremuloidesQUAKING ASPENNative
Populus trichocarpaBLACK COTTONWOODNative
Porophyllum
  ↳  Key to Porophyllum
Porophyllum gracileODORA, SLENDER PORELEAFNative
Porophyllum ruderale var. macrocephalumYERBA POROSAAgricultural weed
Porterella
Porterella carnosulaNative
Portulaca
  ↳  Key to Portulaca
Portulaca granulato-stellulata
(Under Portulaca oleracea)
Synonym
Portulaca halimoidesDESERT PORTULACANative
Portulaca johnstonii
(Under Portulaca oleracea)
Mentioned in
a note
Portulaca nitida
(Under Portulaca oleracea)
Synonym
Portulaca oleraceaPURSLANENaturalized
Portulaca oleracea subsp. granulato-stellulata
(Under Portulaca oleracea)
Synonym
Portulaca oleracea subsp. impolita
(Under Portulaca oleracea)
Mentioned in
a note
Portulaca oleracea subsp. nitida
(Under Portulaca oleracea)
Synonym
Portulaca oleracea subsp. oleracea
(Under Portulaca oleracea)
Synonym
Portulaca oleracea subsp. papillato-stellulata
(Under Portulaca oleracea)
Synonym
Portulaca papillato-stellulata
(Under Portulaca oleracea)
Synonym
Portulaca parvula
(Under Portulaca halimoides)
Synonym
Portulaca retusa
(Under Portulaca oleracea)
Synonym
PortulacaceaePURSLANE FAMILY
Potamogeton
  ↳  Key to Potamogeton
PONDWEED
Potamogeton alpinusNative
Potamogeton alpinus subsp. tenuifolius
(Under Potamogeton alpinus)
Synonym
Potamogeton alpinus var. subellipticus
(Under Potamogeton alpinus)
Synonym
Potamogeton alpinus var. tenuifolius
(Under Potamogeton alpinus)
Synonym
Potamogeton amplifoliusBROAD-LEAVED PONDWEEDNative
Potamogeton berchtoldiiNative
Potamogeton crispusCRISP-LEAVED PONDWEEDNaturalized
Potamogeton diversifoliusDIVERSE-LEAVED PONDWEEDNative
Potamogeton epihydrusNUTTALL'S RIBBON-LEAVED PONDWEEDNative
Potamogeton epihydrus subsp. nuttallii
(Under Potamogeton epihydrus)
Synonym
Potamogeton fibrillosus
(Under Potamogeton foliosus subsp. fibrillosus)
Synonym
Potamogeton filiformis
(Under Stuckenia filiformis subsp. alpina)
Mentioned in
a note
Potamogeton filiformis var. alpinus
(Under Stuckenia filiformis subsp. alpina)
Synonym
Potamogeton filiformis var. macounii
(Under Stuckenia filiformis subsp. alpina)
Synonym
Potamogeton foliosusLEAFY PONDWEEDNative
Potamogeton foliosus subsp. fibrillosusFIBROUS PONDWEEDNative
Potamogeton foliosus subsp. foliosusNative
Potamogeton foliosus var. fibrillosus
(Under Potamogeton foliosus subsp. fibrillosus)
Synonym
Potamogeton foliosus var. foliosus
(Under Potamogeton foliosus subsp. foliosus)
Synonym
Potamogeton gramineusGRASS-LEAVED PONDWEEDNative
Potamogeton illinoensisSHINING PONDWEEDNative
Potamogeton latifolius
(Under Stuckenia striata)
Synonym
Potamogeton natansFLOATING-LEAVED PONDWEEDNative
Potamogeton nodosusLONG-LEAVED PONDWEEDNative
Potamogeton pectinatus
(Under Stuckenia pectinata)
Synonym
Potamogeton praelongusWHITE-STEMMED PONDWEEDNative
Potamogeton pusillusSMALL PONDWEEDNative
Potamogeton pusillus subsp. pusillus
(Under Potamogeton pusillus)
Synonym
Potamogeton pusillus subsp. tenuissimus
(Under Potamogeton berchtoldii)
Synonym
Potamogeton pusillus var. pusillus
(Under Potamogeton pusillus)
Synonym
Potamogeton pusillus var. tenuissimus
(Under Potamogeton berchtoldii)
Synonym
Potamogeton richardsoniiRICHARDSON'S PONDWEEDNative
Potamogeton robbinsiiROBBINS' PONDWEEDNative
Potamogeton zosteriformisEEL-GRASS PONDWEEDNative
Potamogetonaceae
  ↳  Key to Potamogetonaceae
PONDWEED FAMILY
Potentilla
  ↳  Key to Potentilla
CINQUEFOIL
Potentilla anglicaENGLISH CINQUEFOILNaturalized
Potentilla anserinaNative
Potentilla anserina subsp. anserinaCOMMON SILVERWEEDNative
Potentilla anserina subsp. pacificaPACIFIC SILVERWEEDNative
Potentilla anserina var. sericea
(Under Potentilla anserina subsp. anserina)
Synonym
Potentilla basalticaBLACK ROCK POTENTILLANative
Potentilla beanii
(Under Potentilla concinna var. proxima)
Synonym
Potentilla biennisBIENNIAL or GREENE'S CINQUEFOILNative
Potentilla breweriBREWER'S CINQUEFOILNative
Potentilla bruceaeBRUCE'S CINQUEFOILNative
Potentilla callida
(Under Ivesia callida)
Synonym
Potentilla concinna var. proximaEARLY CINQUEFOILNative
Potentilla cristaeCRESTED POTENTILLANative
Potentilla diversifolia
(Under Potentilla glaucophylla var. glaucophylla)
Synonym
Potentilla drummondiiDRUMMOND'S CINQUEFOILNative
Potentilla drummondii subsp. breweri
(Under Potentilla breweri)
Synonym
Potentilla drummondii subsp. bruceae
(Under Potentilla bruceae)
Synonym
Potentilla egedei var. grandis
(Under Potentilla anserina subsp. pacifica)
Synonym
Potentilla elata var. dissita
(Under Horkelia californica var. elata)
Synonym
Potentilla flabellifoliaFAN-FOIL, FANLEAF CINQUEFOILNative
Potentilla flabellifolia var. grayi
(Under Potentilla grayi)
Synonym
Potentilla flabelliformis
(Under Potentilla gracilis var. flabelliformis)
Synonym
Potentilla flabelliformis var. inyoensis
(Under Potentilla gracilis var. elmeri)
Synonym
Potentilla frondosa
(Under Horkelia californica var. frondosa)
Synonym
Potentilla fruticosa
(Under Dasiphora fruticosa)
Synonym
Potentilla glandulosa
(Under Drymocallis glandulosa)
Synonym
Potentilla glandulosa subsp. ashlandica
(Under Drymocallis lactea var. austiniae)
Synonym
Potentilla glandulosa subsp. ewanii
(Under Drymocallis cuneifolia var. ewanii)
Synonym
Potentilla glandulosa subsp. glandulosa
(Under Drymocallis glandulosa var. glandulosa)
Synonym
Potentilla glandulosa subsp. globosa
(Under Drymocallis rhomboidea)
Synonym
Potentilla glandulosa subsp. hansenii
(Under Drymocallis hansenii)
Synonym
Potentilla glandulosa subsp. nevadensis
(Under Drymocallis lactea var. lactea)
Synonym
Potentilla glandulosa subsp. nevadensis
(Under Drymocallis lactea var. austiniae)
Mentioned in
a note
Potentilla glandulosa subsp. pseudorupestris
(Under Drymocallis pseudorupestris)
Synonym
Potentilla glandulosa subsp. reflexa
(Under Drymocallis glandulosa var. reflexa)
Synonym
Potentilla glaucophylla var. glaucophyllaBLUELEAF CINQUEFOILNative
Potentilla gracilisSLENDER CINQUEFOILNative
Potentilla gracilis subsp. nuttallii
(Under Potentilla gracilis var. fastigiata)
Synonym
Potentilla gracilis var. elmeriNative
Potentilla gracilis var. fastigiataNative
Potentilla gracilis var. flabelliformisNative
Potentilla gracilis var. glabrata
(Under Potentilla gracilis var. fastigiata)
Synonym
Potentilla gracilis var. gracilisNative
Potentilla gracilis var. permollis
(Under Potentilla gracilis var. fastigiata)
Synonym
Potentilla gracilis var. pulcherrima
(Under Potentilla pulcherrima)
Synonym
Potentilla grayiGRAY'S CINQUEFOILNative
Potentilla hickmaniiHICKMAN'S CINQUEFOILNative
Potentilla howellii
(Under Horkelia sericata)
Synonym
Potentilla jepsoniiJEPSON'S CINQUEFOILNative
Potentilla luteosericea
(Under Potentilla wheeleri)
Mentioned in
a note
Potentilla millefoliaFEATHER CINQUEFOILNative
Potentilla millefolia var. klamathensis
(Under Potentilla millefolia)
Mentioned in
a note
Potentilla morefieldiiMOREFIELD'S CINQUEFOILNative
Potentilla multijugaBALLONA CINQUEFOILNative
Potentilla newberryiNEWBERRY'S CINQUEFOILNative
Potentilla norvegicaNORWEGIAN or ROUGH CINQUEFOILNaturalized
Potentilla norvegica subsp. monspeliensis
(Under Potentilla norvegica)
Synonym
Potentilla palustris
(Under Comarum palustre)
Synonym
Potentilla patellifera
(Under Ivesia patellifera)
Synonym
Potentilla pectinisecta
(Under Potentilla gracilis var. elmeri)
Synonym
Potentilla peirsonii
(Under Drymocallis cuneifolia var. cuneifolia)
Synonym
Potentilla pensylvanicaPRAIRIE CINQUEFOILNative
Potentilla pensylvanica var. ovium
(Under Potentilla jepsonii)
Synonym
Potentilla pseudosericeaMONO CINQUEFOILNative
Potentilla pulcherrimaBEAUTIFUL CINQUEFOILNative
Potentilla rectaSULPHUR CINQUEFOILNaturalized
Potentilla reptans
(Under Potentilla anglica)
Mentioned in
a note
Potentilla rhomboidea
(Under Drymocallis rhomboidea)
Synonym
Potentilla rimicolaCLIFF CINQUEFOILNative
Potentilla rivalisBROOK or RIVER CINQUEFOILNative
Potentilla rivalis var. millegrana
(Under Potentilla rivalis)
Synonym
Potentilla rosulata
(Under Ivesia saxosa)
Synonym
Potentilla saxosa
(Under Ivesia saxosa)
Synonym
Potentilla saxosa subsp. sierrae
(Under Ivesia saxosa)
Synonym
Potentilla subvillosa
(Under Potentilla bruceae)
Synonym
Potentilla uliginosaCUNNINGHAM MARSH CINQUEFOILNative
Potentilla wheeleriWHEELER'S CINQUEFOILNative
Potentilla wheeleri var. rimicola
(Under Potentilla rimicola)
Synonym
Poteridium
Poteridium annuumWESTERN BURNETNative
Poterium
Poterium sanguisorbaGARDEN BURNETNaturalized
Prenanthella
Prenanthella exiguaBRIGHTWHITENative
Primula
  ↳  Key to Primula
PRIMROSE, SHOOTING STAR
Primula clevelandiiNative
Primula clevelandii var. clevelandiiNative
Primula clevelandii var. gracilisNative
Primula clevelandii var. insularisNative
Primula clevelandii var. patulaNative
Primula conjugensNative
Primula fragransNative
Primula hendersoniiMOSQUITO BILL(S), SAILOR CAPSNative
Primula jeffreyiSIERRA SHOOTING STARNative
Primula paucifloraBEAUTIFUL SHOOTING STARNative
Primula pauciflora var. macrocarpa
(Under Primula pauciflora)
Synonym
Primula pauciflora var. monantha
(Under Primula pauciflora)
Synonym
Primula pauciflora var. pauciflora
(Under Primula pauciflora)
Mentioned in
a note
Primula pauciflora var. shoshonense
(Under Primula pauciflora)
Mentioned in
a note
Primula pauciflora var. shoshonensis
(Under Primula pauciflora)
Synonym
Primula subalpinaNative
Primula suffrutescensSIERRA PRIMROSENative
Primula tetrandraALPINE SHOOTING STARNative
Primula tetrandra
(Under Primula tetrandra)
Synonym
Primulaceae
  ↳  Key to Primulaceae
PRIMROSE FAMILY
Prionopsis ciliata
(Under Grindelia)
Mentioned in
a note
Proboscidea
  ↳  Key to Proboscidea
UNICORN-PLANT
Proboscidea althaeifoliaDESERT UNICORN-PLANTNative
Proboscidea altheaefolia
(Under Proboscidea althaeifolia)
Synonym
Proboscidea louisianica subsp. louisianicaNaturalized
Proboscidea luteaNaturalized
Proboscidea parviflora subsp. parviflora
(Under Proboscidea)
Mentioned in
a note
Proboscidea parviflora var. hohokamiana
(Under Proboscidea)
Mentioned in
a note
Prosartes
  ↳  Key to Prosartes
Prosartes hookeriNative
Prosartes hookeri var. hookeri
(Under Prosartes hookeri)
Synonym
Prosartes hookeri var. parvifolia
(Under Prosartes parvifolia)
Synonym
Prosartes hookeri var. trachyandra
(Under Prosartes hookeri)
Synonym
Prosartes parvifoliaSISKIYOU BELLSNative
Prosartes smithiiNative
Prosopis
  ↳  Key to Prosopis
MESQUITE
Prosopis glandulosa var. torreyanaHONEY MESQUITENative
Prosopis juliflora var. torreyana
(Under Prosopis glandulosa var. torreyana)
Synonym
Prosopis juliflora var. velutina
(Under Prosopis velutina)
Synonym
Prosopis pubescensSCREW BEAN, TORNILLONative
Prosopis strombuliferaARGENTINE SCREWBEANWaif
Prosopis velutinaNaturalized
ProteaceaePROTEA FAMILY
PrunellaSELF-HEAL
Prunella vulgaris
  ↳  Key to Prunella vulgaris
Native
Prunella vulgaris subsp. lanceolata
(Under Prunella vulgaris var. lanceolata)
Synonym
Prunella vulgaris var. atropurpurea
(Under Prunella vulgaris var. lanceolata)
Synonym
Prunella vulgaris var. lanceolataNative
Prunella vulgaris var. parviflora
(Under Prunella vulgaris var. vulgaris)
Synonym
Prunella vulgaris var. vulgarisNaturalized
Prunus
  ↳  Key to Prunus
Prunus amygdalus
(Under Prunus dulcis)
Synonym
Prunus andersoniiDESERT PEACHNative
Prunus armeniaca
(Under Prunus)
Mentioned in
a note
Prunus avium
(Under Prunus)
Mentioned in
a note
Prunus caroliniana
(Under Prunus)
Mentioned in
a note
Prunus cerasiferaCHERRY PLUMNaturalized
Prunus cerasus
(Under Prunus)
Mentioned in
a note
Prunus domestica
(Under Prunus)
Mentioned in
a note
Prunus dulcisALMONDNaturalized
Prunus emarginataBITTER CHERRYNative
Prunus eremophilaMOJAVE DESERT PLUMNative
Prunus fasciculataDESERT ALMONDNative
Prunus fasciculata var. fasciculataNative
Prunus fasciculata var. punctataSAND ALMONDNative
Prunus fremontiiDESERT APRICOTNative
Prunus ilicifoliaNative
Prunus ilicifolia subsp. ilicifoliaISLAY, HOLLY-LEAFED CHERRYNative
Prunus ilicifolia subsp. lyoniiCATALINA CHERRYNative
Prunus laurocerasus
(Under Prunus)
Mentioned in
a note
Prunus lusitanica
(Under Prunus)
Mentioned in
a note
Prunus lyonii
(Under Prunus ilicifolia subsp. lyonii)
Synonym
Prunus mahaleb
(Under Prunus)
Mentioned in
a note
Prunus munsoniana
(Under Prunus)
Mentioned in
a note
Prunus persicaPEACHNaturalized
Prunus speciosa
(Under Prunus)
Mentioned in
a note
Prunus subcordataPACIFIC PLUM, SIERRA PLUMNative
Prunus subcordata var. oregana
(Under Prunus subcordata)
Mentioned in
a note
Prunus virginiana var. demissaWESTERN CHOKE CHERRYNative
Prunus virginiana var. virginiana
(Under Prunus virginiana var. demissa)
Mentioned in
a note
Prunus yedoensis
(Under Prunus)
Mentioned in
a note
Psathyrotes
  ↳  Key to Psathyrotes
Psathyrotes annuaNative
Psathyrotes ramosissimaTURTLEBACKNative
Pseudelymus saxicola
(Under Elymus elymoides)
Mentioned in
a note
Pseudelymus saxicola
(Under Elymus spicatus)
Mentioned in
a note
Pseudobahia
  ↳  Key to Pseudobahia
Pseudobahia bahiifoliaHARTWEG'S GOLDEN SUNBURSTNative
Pseudobahia bahiifolia var. pinnatifida
(Under Pseudobahia heermannii)
Synonym
Pseudobahia heermanniiFOOTHILL SUNBURST, BRITTLESTEMNative
Pseudobahia peirsoniiSAN JOAQUIN ADOBE SUNBURSTNative
Pseudognaphalium
  ↳  Key to Pseudognaphalium
CUDWEED, EVERLASTING
Pseudognaphalium beneolensNative
Pseudognaphalium biolettiiNative
Pseudognaphalium californicumNative
Pseudognaphalium canescensNative
Pseudognaphalium canescens subsp. beneolens
(Under Pseudognaphalium beneolens)
Synonym
Pseudognaphalium leucocephalumWHITE RABBIT-TOBACCONative
Pseudognaphalium luteoalbumNaturalized
Pseudognaphalium macouniiMACOUN'S EVERLASTINGNative
Pseudognaphalium microcephalumNative
Pseudognaphalium microcephalum var. thermale
(Under Pseudognaphalium thermale)
Synonym
Pseudognaphalium ramosissimumNative
Pseudognaphalium roseumNative
Pseudognaphalium stramineumNative
Pseudognaphalium thermaleNative
Pseudoroegneria spicata
(Under Elymus spicatus)
Synonym
Pseudoroegneria spicata subsp. spicata
(Under Elymus spicatus)
Synonym
Pseudorontium
Pseudorontium cyathiferumDEEP CANYON SNAPDRAGONNative
Pseudosasa japonica
(Under Phyllostachys)
Mentioned in
a note
Pseudostellaria
  ↳  Key to Pseudostellaria
Pseudostellaria jamesianaTUBER STARWORTNative
Pseudostellaria sierraeSIERRA STARWORTNative
Pseudotrillium
Pseudotrillium rivaleBROOK WAKEROBINNative
Pseudotsuga
  ↳  Key to Pseudotsuga
Pseudotsuga macrocarpaBIGCONE DOUGLAS-FIR, BIGCONE SPRUCENative
Pseudotsuga menziesii var. menziesiiDOUGLAS-FIRNative
Psidium guajava
(Under Myrtaceae)
Mentioned in
a note
Psilocarphus
  ↳  Key to Psilocarphus
WOOLLY-MARBLES, WOOLLYHEADS
Psilocarphus brevissimusNative
Psilocarphus brevissimus var. brevissimusDWARF WOOLLYHEADSNative
Psilocarphus brevissimus var. multiflorusDELTA WOOLLY-MARBLESNative
Psilocarphus chilensisROUND WOOLLY-MARBLESNative
Psilocarphus elatiorTALL WOOLLY-MARBLESNative
Psilocarphus globiferus
(Under Psilocarphus brevissimus var. brevissimus)
Synonym
Psilocarphus globiferus
(Under Psilocarphus chilensis)
Synonym
Psilocarphus oregonusOREGON WOOLLYHEADSNative
Psilocarphus tenellusSLENDER WOOLLY-MARBLESNative
Psilocarphus tenellus var. globiferus
(Under Psilocarphus chilensis)
Synonym
Psilocarphus tenellus var. globiferus
(Under Psilocarphus brevissimus var. brevissimus)
Mentioned in
a note
Psilocarphus tenellus var. tenellus
(Under Psilocarphus tenellus)
Synonym
Psilocarphus tenellus var. tenuis
(Under Psilocarphus chilensis)
Synonym
PsilostrophePAPER-DAISY
Psilostrophe cooperiNative
Psilotum nudum
(Under Ophioglossaceae)
Mentioned in
a note
Psoralea bituminosa
(Under Bituminaria bituminosa)
Synonym
Psoralea californica
(Under Pediomelum californicum)
Synonym
Psoralea castorea
(Under Pediomelum castoreum)
Synonym
Psoralea hallii var. media
(Under Hoita macrostachya)
Synonym
Psoralea lanceolata
(Under Ladeania lanceolata)
Synonym
Psoralea lanceolata subsp. scabra
(Under Ladeania lanceolata)
Synonym
Psoralea orbicularis
(Under Hoita orbicularis)
Synonym
Psoralea physodes
(Under Rupertia physodes)
Synonym
Psoralea rigida
(Under Rupertia rigida)
Synonym
Psoralea strobilina
(Under Hoita strobilina)
Synonym
Psoralidium lanceolatum
(Under Ladeania lanceolata)
Synonym
Psoralidium lanceolatum
(Under Fabaceae (Leguminosae))
Mentioned in
a note
Psorodendron arborescens
(Under Psorothamnus arborescens var. arborescens)
Synonym
Psorodendron fremontii
(Under Psorothamnus fremontii var. fremontii)
Synonym
Psorodendron schottii
(Under Psorothamnus schottii)
Synonym
Psorothamnus
  ↳  Key to Psorothamnus
INDIGO-BUSH
Psorothamnus arborescensMOJAVE INDIGO-BUSHNative
Psorothamnus arborescens var. arborescensNative
Psorothamnus arborescens var. minutifoliusNative
Psorothamnus arborescens var. simplicifoliusNative
Psorothamnus emoryiNative
Psorothamnus fremontiiFREMONT'S DALEANative
Psorothamnus fremontii var. attenuatusNARROW-LEAVED PSOROTHAMNUSNative
Psorothamnus fremontii var. fremontiiNative
Psorothamnus polydeniusNative
Psorothamnus schottiiINDIGO-BUSHNative
Psorothamnus spinosusSMOKE TREENative
PteleaHOP TREE
Ptelea crenulataNative
Pteridaceae
  ↳  Key to Pteridaceae
BRAKE FAMILY
PteridiumBRACKEN, BRAKE
Pteridium aquilinum var. pubescensNative
Pteris
  ↳  Key to Pteris
BRAKE
Pteris creticaCRETAN BRAKENaturalized
Pteris tremulaWaif
Pteris vittataLADDER BRAKENaturalized
PterocaryaWINGNUT
Pterocarya stenopteraCHINESE WINGNUTWaif
PterosporaPINEDROPS
Pterospora andromedeaNative
PterostegiaWOODLAND THREADSTEM
Pterostegia diphylla
(Under Pterostegia drymarioides)
Synonym
Pterostegia diphylla var. biloba
(Under Pterostegia drymarioides)
Synonym
Pterostegia drymarioidesNative
Pterostegia microphylla
(Under Pterostegia drymarioides)
Synonym
Pteryxia petraea
(Under Cymopterus terebinthinus var. petraeus)
Synonym
Pteryxia terebinthina var. californica
(Under Cymopterus terebinthinus var. californicus)
Synonym
Ptilagrostis kingii
(Under Stipa kingii)
Synonym
Puccinellia
  ↳  Key to Puccinellia
ALKALI GRASS
Puccinellia airoides
(Under Puccinellia nuttalliana)
Synonym
Puccinellia californica
(Under Torreyochloa pallida var. pauciflora)
Synonym
Puccinellia distansEUROPEAN ALKALI GRASSNaturalized
Puccinellia erecta
(Under Torreyochloa erecta)
Synonym
Puccinellia grandis
(Under Puccinellia nutkaensis)
Synonym
Puccinellia howelliiHOWELL'S ALKALI GRASSNative
Puccinellia lemmoniiLEMMON'S ALKALI GRASSNative
Puccinellia maritima
(Under Puccinellia)
Mentioned in
a note
Puccinellia nutkaensisALASKA ALKALI GRASSNative
Puccinellia nuttallianaNUTTALL'S ALKALI GRASSNative
Puccinellia parishiiPARISH'S ALKALI GRASSNative
Puccinellia pauciflora
(Under Torreyochloa pallida var. pauciflora)
Synonym
Puccinellia pumilaDWARF ALKALI GRASSNative
Puccinellia simplexNative
Puccinia graminis
(Under Berberis vulgaris)
Mentioned in
a note
Pugiopappus bigelovii
(Under Leptosyne bigelovii)
Synonym
PulicariaFALSE-FLEABANE
Pulicaria hispanica
(Under Pulicaria paludosa)
Synonym
Pulicaria paludosaNaturalized
PunicaPOMEGRANATE
Punica granatumNaturalized
Purpusia saxosa
(Under Ivesia arizonica var. arizonica)
Synonym
Purshia
  ↳  Key to Purshia
Purshia glandulosa
(Under Purshia tridentata var. glandulosa)
Synonym
Purshia mexicana var. stansburyana
(Under Purshia stansburyana)
Synonym
Purshia stansburyanaCLIFFROSENative
Purshia tridentataBITTERBRUSHNative
Purshia tridentata var. glandulosaNative
Purshia tridentata var. tridentataNative
Pycnanthemum
Pycnanthemum californicumNative
Pyracantha
  ↳  Key to Pyracantha
Pyracantha angustifoliaSLENDER or WOOLLY FIRETHORNNaturalized
Pyracantha atalantioidesSICHUAN FIRETHORNWaif
Pyracantha coccineaFIRETHORN or SCARLET FIRETHORNWaif
Pyracantha crenatoserrata
(Under Pyracantha fortuneana)
Synonym
Pyracantha crenulataHIMALAYAN or NEPAL FIRETHORNWaif
Pyracantha fortuneanaCHINESE FIRETHORNNaturalized
Pyracantha koidzumiiTAIWAN FIRETHORNNaturalized
Pyracantha rogersiana
(Under Pyracantha fortuneana)
Synonym
Pyrola
  ↳  Key to Pyrola
WINTERGREEN
Pyrola aphyllaLEAFLESS WINTERGREENNative
Pyrola asarifoliaNative
Pyrola asarifolia subsp. asarifoliaBOG WINTERGREENNative
Pyrola asarifolia subsp. bracteataLONG-BRACTED WINTERGREENNative
Pyrola asarifolia var. purpurea
(Under Pyrola asarifolia subsp. asarifolia)
Synonym
Pyrola bracteata
(Under Pyrola asarifolia subsp. bracteata)
Synonym
Pyrola californica
(Under Pyrola asarifolia subsp. asarifolia)
Synonym
Pyrola chloranthaGREEN-FLOWERED WINTERGREENNative
Pyrola cryptaCRYPTIC WINTERGREENNative
Pyrola dentataTOOTHED WINTERGREENNative
Pyrola minorLESSER WINTERGREENNative
Pyrola pallida
(Under Pyrola dentata)
Synonym
Pyrola pictaWHITE-VEINED WINTERGREENNative
Pyrola picta f. aphylla
(Under Pyrola aphylla)
Synonym
Pyrola picta f. aphylla
(Under Pyrola picta)
Synonym
Pyrola picta subsp. dentata
(Under Pyrola dentata)
Synonym
Pyrola picta subsp. dentata
(Under Pyrola picta)
Synonym
Pyrola picta subsp. integra
(Under Pyrola dentata)
Synonym
Pyrola picta subsp. pallida
(Under Pyrola dentata)
Synonym
Pyrola picta var. dentata
(Under Pyrola dentata)
Synonym
Pyrola rotundifolia
(Under Pyrola minor)
Mentioned in
a note
Pyrola secunda
(Under Orthilia secunda)
Synonym
Pyrola virens
(Under Pyrola chlorantha)
Synonym
Pyrrocoma
  ↳  Key to Pyrrocoma
Pyrrocoma apargioidesALPINE FLAMESNative
Pyrrocoma carthamoides var. cusickiiLARGE-FLOWERED GOLDENWEEDNative
Pyrrocoma hirtaTACKY GOLDENWEEDNative
Pyrrocoma hirta var. hirtaNative
Pyrrocoma hirta var. lanulosaNative
Pyrrocoma lanceolataLANCE-LEAVED GOLDENWEED; Native
Pyrrocoma lanceolata var. lanceolataNative
Pyrrocoma lanceolata var. subviscosaNative
Pyrrocoma lanulosa
(Under Pyrrocoma hirta var. lanulosa)
Synonym
Pyrrocoma lucidaSTICKY PYRROCOMANative
Pyrrocoma racemosaCLUSTERED GOLDENWEEDNative
Pyrrocoma racemosa var. congestaDEL NORTE PYRROCOMANative
Pyrrocoma racemosa var. paniculataNative
Pyrrocoma racemosa var. pinetorumPINE PYRROCOMANative
Pyrrocoma racemosa var. racemosaNative
Pyrrocoma racemosa var. sessilifloraNative
Pyrrocoma unifloraPLANTAIN GOLDENWEEDNative
Pyrrocoma uniflora var. gossypinaBEAR VALLEY PYRROCOMANative
Pyrrocoma uniflora var. unifloraNative
PyrusPEAR
Pyrus calleryana
(Under Pyrus)
Mentioned in
a note
Pyrus communisCOMMON PEARNaturalized
Pyrus dioica
(Under Malus pumila)
Mentioned in
a note
Pyrus malus
(Under Malus pumila)
Synonym
probably Opuntia mojavensis Engelm. & J.M. Bigelow.
(Under Opuntia phaeacantha)
Synonym