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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: H

Scientific NameCommon Name
Habenaria dilatata var. leucostachys
(Under Platanthera dilatata var. leucostachys)
Synonym
Habenaria elegans var. elata
(Under Piperia elongata)
Synonym
Habenaria elegans var. maritima
(Under Piperia elegans subsp. elegans)
Synonym
Habenaria elegans var. multiflora
(Under Piperia elegans subsp. elegans)
Synonym
Habenaria greenei
(Under Piperia elegans subsp. elegans)
Synonym
Habenaria leucostachys var. virida
(Under Platanthera sparsiflora)
Synonym
Habenaria saccata
(Under Platanthera stricta)
Synonym
Habenaria unalascensis
(Under Piperia unalascensis)
Synonym
Hackelia
  ↳  Key to Hackelia
STICKSEED
Hackelia amethystinaAMETHYST STICKSEEDNative
Hackelia bellaBEAUTIFUL STICKSEEDNative
Hackelia breviculaPOISON CANYON STICKSEEDNative
Hackelia californicaCALIFORNIA STICKSEEDNative
Hackelia cusickiiCUSICK'S STICKSEEDNative
Hackelia floribundaMANY-FLOWERED STICKSEEDNative
Hackelia jessicae
(Under Hackelia micrantha)
Synonym
Hackelia longituba
(Under Hackelia velutina)
Synonym
Hackelia micranthaJESSICA'S STICKSEED, MEADOW STICKSEEDNative
Hackelia mundulaPINK-FLOWERED STICKSEEDNative
Hackelia nervosaSIERRAN STICKSEEDNative
Hackelia setosaBRISTLY STICKSEED, SISKIYOU STICKSEEDNative
Hackelia sharsmithiiSHARSMITH'S STICKSEEDNative
Hackelia velutinaVELVETY STICKSEEDNative
HainardiaBARB GRASS
Hainardia cylindricaNaturalized
Halerpestes cymbalaria
(Under Ranunculus cymbalaria)
Synonym
Halimodendron
Halimodendron halodendronRUSSIAN SALT TREEAgricultural weed
Halimolobos
Halimolobos diffusa var. jaegeri
(Under Halimolobos jaegeri)
Synonym
Halimolobos jaegeriNative
Halimolobos virgata
(Under Transberingia bursifolia subsp. virgata)
Synonym
Halimolobos virgata
(Under Halimolobos jaegeri)
Mentioned in
a note
Halogeton
Halogeton glomeratusSALTLOVERNaturalized
HaloragaceaeWATER-MILFOIL FAMILY
Haloragis erecta
(Under Haloragaceae)
Mentioned in
a note
Haplopappus acaulis
(Under Stenotus acaulis)
Synonym
Haplopappus acradenius subsp. bracteosus
(Under Isocoma acradenia var. bracteosa)
Synonym
Haplopappus acradenius subsp. eremophilus
(Under Isocoma acradenia var. eremophila)
Synonym
Haplopappus apargioides
(Under Pyrrocoma apargioides)
Synonym
Haplopappus arborescens
(Under Ericameria arborescens)
Synonym
Haplopappus bloomeri
(Under Ericameria bloomeri)
Synonym
Haplopappus brickellioides
(Under Hazardia brickellioides)
Synonym
Haplopappus canus
(Under Hazardia cana)
Synonym
Haplopappus carthamoides subsp. cusickii
(Under Pyrrocoma carthamoides var. cusickii)
Synonym
Haplopappus cuneatus var. spathulatus
(Under Ericameria cuneata var. spathulata)
Synonym
Haplopappus eastwoodiae
(Under Ericameria fasciculata)
Synonym
Haplopappus ericoides
(Under Ericameria ericoides)
Synonym
Haplopappus ericoides subsp. blakei
(Under Ericameria ericoides)
Synonym
Haplopappus eximius
(Under Tonestus eximius)
Synonym
Haplopappus eximius subsp. peirsonii
(Under Tonestus peirsonii)
Synonym
Haplopappus gilmanii
(Under Ericameria gilmanii)
Synonym
Haplopappus greenei
(Under Ericameria greenei)
Synonym
Haplopappus hirtus subsp. hirtus
(Under Pyrrocoma hirta var. hirta)
Synonym
Haplopappus hirtus subsp. lanulosus
(Under Pyrrocoma hirta var. lanulosa)
Synonym
Haplopappus hirtus var. lanulosus
(Under Pyrrocoma hirta var. lanulosa)
Synonym
Haplopappus lanceolatus
(Under Pyrrocoma lanceolata var. lanceolata)
Synonym
Haplopappus lanceolatus subsp. tenuicaulis
(Under Pyrrocoma lanceolata var. lanceolata)
Synonym
Haplopappus laricifolius
(Under Ericameria laricifolia)
Synonym
Haplopappus linearifolius
(Under Ericameria linearifolia)
Synonym
Haplopappus lucidus
(Under Pyrrocoma lucida)
Synonym
Haplopappus lyallii
(Under Tonestus lyallii)
Synonym
Haplopappus macronema
(Under Ericameria discoidea)
Synonym
Haplopappus nanus
(Under Ericameria nana)
Synonym
Haplopappus occidentalis
(Under Benitoa occidentalis)
Synonym
Haplopappus ophitidis
(Under Ericameria ophitidis)
Synonym
Haplopappus peirsonii
(Under Tonestus peirsonii)
Synonym
Haplopappus pinifolius
(Under Ericameria pinifolia)
Synonym
Haplopappus propinquus
(Under Ericameria brachylepis)
Synonym
Haplopappus racemosus subsp. congestus
(Under Pyrrocoma racemosa var. congesta)
Synonym
Haplopappus racemosus subsp. glomeratus
(Under Pyrrocoma racemosa var. paniculata)
Synonym
Haplopappus racemosus subsp. pinetorum
(Under Pyrrocoma racemosa var. pinetorum)
Synonym
Haplopappus racemosus subsp. sessiliflorus
(Under Pyrrocoma racemosa var. sessiliflora)
Synonym
Haplopappus squarrosus subsp. grindelioides
(Under Hazardia squarrosa var. grindelioides)
Synonym
Haplopappus squarrosus subsp. obtusus
(Under Hazardia squarrosa var. obtusa)
Synonym
Haplopappus squarrosus subsp. stenolepis
(Under Hazardia stenolepis)
Synonym
Haplopappus stenophyllus
(Under Nestotus stenophyllus)
Synonym
Haplopappus suffruticosus
(Under Ericameria suffruticosa)
Synonym
Haplopappus uniflorus subsp. gossypinus
(Under Pyrrocoma uniflora var. gossypina)
Synonym
Haplopappus venetus subsp. argutus
(Under Isocoma arguta)
Synonym
Haplopappus venetus subsp. furfuraceus
(Under Isocoma menziesii var. menziesii)
Synonym
Haplopappus whitneyi subsp. discoideus
(Under Hazardia whitneyi var. discoidea)
Synonym
Harmonia
  ↳  Key to Harmonia
Harmonia doris-nilesiaeNILES' HARMONIANative
Harmonia guggolziorumGUGGOLZ'S HARMONIANative
Harmonia halliiHALL'S HARMONIANative
Harmonia nutansNODDING HARMONIANative
Harmonia stebbinsiiSTEBBINS' HARMONIANative
Harpagonella
Harpagonella palmeriPALMER'S GRAPPLINGHOOKNative
Hastingsia
  ↳  Key to Hastingsia
Hastingsia albaNative
Hastingsia serpentinicolaNative
Hazardia
  ↳  Key to Hazardia
GOLDENBUSH
Hazardia brickellioidesBRICKELL GOLDENBUSHNative
Hazardia canaSAN CLEMENTE ISLAND HAZARDIANative
Hazardia detonsaISLAND HAZARDIANative
Hazardia orcuttiiORCUTT'S HAZARDIANative
Hazardia squarrosaSAW-TOOTHED GOLDENBUSHNative
Hazardia squarrosa var. grindelioidesNative
Hazardia squarrosa var. obtusaNative
Hazardia squarrosa var. squarrosaNative
Hazardia stenolepisNative
Hazardia whitneyiWHITNEY'S GOLDENBUSHNative
Hazardia whitneyi var. discoideaNative
Hazardia whitneyi var. whitneyiNative
Hebe speciosa
(Under Plantaginaceae)
Mentioned in
a note
Hecastocleis
Hecastocleis shockleyiNative
Hedeoma
  ↳  Key to Hedeoma
MOCK PENNYROYAL
Hedeoma drummondiiDRUMMOND'S FALSE PENNYROYALNative
Hedeoma nana subsp. californicaCALIFORNIA MOCK PENNYROYALNative
Hedeoma nanum subsp. californicum
(Under Hedeoma nana subsp. californica)
Synonym
Hedera
  ↳  Key to Hedera
IVY
Hedera canariensisCANARY ISLANDS IVYNaturalized
Hedera helixENGLISH IVYNaturalized
Hedera helix subsp. canariensis
(Under Hedera canariensis)
Synonym
Hedera helix subsp. helix
(Under Hedera helix)
Synonym
HedychiumGINGER-LILY
Hedychium flavescensYELLOW GINGERWaif
Hedypnois
Hedypnois cretica
(Under Hedypnois rhagadioloides)
Synonym
Hedypnois rhagadioloidesCRETE WEEDNaturalized
Heleniastrum autumnale
(Under Helenium autumnale)
Synonym
Heleniastrum bigelovii
(Under Helenium bigelovii)
Synonym
Heleniastrum bolanderi
(Under Helenium bolanderi)
Synonym
Heleniastrum occidentale
(Under Helenium bigelovii)
Synonym
Heleniastrum puberulum
(Under Helenium puberulum)
Synonym
Heleniastrum rivulare
(Under Helenium bigelovii)
Synonym
Helenium
  ↳  Key to Helenium
SNEEZEWEED
Helenium altissimum
(Under Helenium autumnale)
Synonym
Helenium amarum var. amarumNaturalized
Helenium autumnaleNative
Helenium autumnale var. canaliculatum
(Under Helenium autumnale)
Synonym
Helenium autumnale var. fylesii
(Under Helenium autumnale)
Synonym
Helenium autumnale var. grandiflorum
(Under Helenium autumnale)
Synonym
Helenium autumnale var. montanum
(Under Helenium autumnale)
Synonym
Helenium autumnale var. parviflorum
(Under Helenium autumnale)
Synonym
Helenium bigeloviiNative
Helenium bigelovii var. festivum
(Under Helenium bolanderi)
Synonym
Helenium bolanderiNative
Helenium californicum
(Under Helenium puberulum)
Synonym
Helenium canaliculatum
(Under Helenium autumnale)
Synonym
Helenium decurrens
(Under Helenium puberulum)
Synonym
Helenium edwardsianum
(Under Helenium autumnale)
Synonym
Helenium grandiflorum
(Under Helenium autumnale)
Synonym
Helenium hoopesii
(Under Hymenoxys hoopesii)
Synonym
Helenium huronense
(Under Helenium autumnale)
Synonym
Helenium latifolium
(Under Helenium autumnale)
Synonym
Helenium macranthum
(Under Helenium autumnale)
Synonym
Helenium montanum
(Under Helenium autumnale)
Synonym
Helenium parviflorum
(Under Helenium autumnale)
Synonym
Helenium puberulumNative
Helenium pubescens
(Under Helenium puberulum)
Synonym
Helenium rivulare
(Under Helenium bigelovii)
Synonym
Helenium rosilla
(Under Helenium puberulum)
Synonym
Helenium tenuifolium
(Under Helenium amarum var. amarum)
Synonym
Heleochloa schoenoides
(Under Crypsis schoenoides)
Synonym
Helianthella
  ↳  Key to Helianthella
Helianthella californicaNative
Helianthella californica subsp. californica
(Under Helianthella californica var. californica)
Synonym
Helianthella californica subsp. nevadensis
(Under Helianthella californica var. nevadensis)
Synonym
Helianthella californica subsp. shastensis
(Under Helianthella californica var. shastensis)
Synonym
Helianthella californica var. californicaNative
Helianthella californica var. nevadensisNative
Helianthella californica var. shastensisNative
Helianthella castaneaDIABLO HELIANTHELLANative
Helianthemum aldersonii
(Under Crocanthemum aldersonii)
Synonym
Helianthemum greenei
(Under Crocanthemum greenei)
Synonym
Helianthemum guttatum
(Under Tuberaria guttata)
Synonym
Helianthemum mendocinensis
(Under Crocanthemum scoparium var. scoparium)
Mentioned in
a note
Helianthemum scoparium
(Under Crocanthemum aldersonii)
Synonym
Helianthemum scoparium
(Under Crocanthemum scoparium)
Synonym
Helianthemum scoparium
(Under Crocanthemum scoparium var. scoparium)
Synonym
Helianthemum scoparium
(Under Crocanthemum scoparium var. vulgare)
Synonym
Helianthemum scoparium
(Under Crocanthemum suffrutescens)
Synonym
Helianthemum scoparium var. aldersonii
(Under Crocanthemum aldersonii)
Synonym
Helianthemum scoparium var. scoparium
(Under Crocanthemum scoparium var. scoparium)
Synonym
Helianthemum scoparium var. vulgare
(Under Crocanthemum scoparium var. vulgare)
Synonym
Helianthemum suffrutescens
(Under Crocanthemum suffrutescens)
Synonym
Helianthus
  ↳  Key to Helianthus
SUNFLOWER
Helianthus annuusNative
Helianthus annuus subsp. jaegeri
(Under Helianthus annuus)
Synonym
Helianthus annuus subsp. lenticularis
(Under Helianthus annuus)
Synonym
Helianthus annuus var. macrocarpus
(Under Helianthus annuus)
Synonym
Helianthus bolanderiBOLANDER'S SUNFLOWERNative
Helianthus californicusCALIFORNIA SUNFLOWERNative
Helianthus ciliarisBLUEWEEDNaturalized
Helianthus cusickiiCUSICK'S SUNFLOWERNative
Helianthus exilisSERPENTINE SUNFLOWERNative
Helianthus gracilentusSLENDER SUNFLOWERNative
Helianthus inexpectatusNEWHALL SUNFLOWERNative
Helianthus maximilianii
(Under Helianthus)
Mentioned in
a note
Helianthus niveus subsp. canescens
(Under Helianthus petiolaris subsp. canescens)
Synonym
Helianthus niveus subsp. tephrodesALGODONES DUNES SUNFLOWERNative
Helianthus nuttalliiNative
Helianthus nuttallii subsp. nuttalliiNUTTALL'S SUNFLOWERNative
Helianthus nuttallii subsp. parishiiLOS ANGELES SUNFLOWERNative
Helianthus petiolarisPRAIRIE SUNFLOWERNative
Helianthus petiolaris subsp. canescensNative
Helianthus petiolaris subsp. petiolarisNaturalized
Helichrysum
Helichrysum orbiculare
(Under Plecostachys serpyllifolia)
Synonym
Helichrysum petiolareLICORICE PLANTNaturalized
Helichrysum serpyllifolium
(Under Plecostachys serpyllifolia)
Synonym
HeliomerisGOLDEN-EYE
Heliomeris hispida
(Under Heliomeris)
Mentioned in
a note
Heliomeris multiflora var. nevadensisNEVADA GOLDENEYENative
Heliotropium
  ↳  Key to Heliotropium
HELIOTROPE
Heliotropium amplexicauleFRAGRANT HELIOTROPENaturalized
Heliotropium californicum
(Under Heliotropium convolvulaceum var. californicum)
Synonym
Heliotropium convolvulaceum var. californicumMORNING-GLORY HELIOTROPENative
Heliotropium curassavicum var. oculatumSEASIDE HELIOTROPE, ALKALI HELIOTROPENative
Heliotropium europaeumEUROPEAN HELIOTROPENaturalized
Heliotropium oculatum
(Under Heliotropium curassavicum var. oculatum)
Synonym
Heliotropium spathulatum subsp. oculatum
(Under Heliotropium curassavicum var. oculatum)
Synonym
HelminthothecaOX-TONGUE
Helminthotheca echioidesBRISTLY OX-TONGUENaturalized
Helxine soleirolii
(Under Soleirolia soleirolii)
Synonym
Hemicarpha micrantha
(Under Lipocarpha micrantha)
Synonym
Hemicarpha micrantha var. aristulata
(Under Lipocarpha aristulata)
Synonym
Hemicarpha micrantha var. minor
(Under Lipocarpha micrantha)
Synonym
Hemicarpha occidentalis
(Under Lipocarpha occidentalis)
Synonym
Hemieva
Hemieva ranunculifoliaNative
HemitomesGNOME PLANT
Hemitomes congestumNative
HemizonellaMINIATURE TARWEED
Hemizonella minimaNative
HemizoniaHAYFIELD TARWEED
Hemizonia angustifolia
(Under Deinandra corymbosa)
Synonym
Hemizonia arida
(Under Deinandra arida)
Synonym
Hemizonia calyculata
(Under Hemizonia congesta subsp. calyculata)
Synonym
Hemizonia clementina
(Under Deinandra clementina)
Synonym
Hemizonia clevelandii
(Under Hemizonia congesta subsp. clevelandii)
Synonym
Hemizonia congesta
  ↳  Key to Hemizonia congesta
Native
Hemizonia congesta subsp. calyculataMENDOCINO TARPLANTNative
Hemizonia congesta subsp. clevelandiiNative
Hemizonia congesta subsp. congestaCONGESTED-HEADED HAYFIELD TARPLANTNative
Hemizonia congesta subsp. congesta
(Under Hemizonia congesta subsp. lutescens)
Synonym
Hemizonia congesta subsp. leucocephala
(Under Hemizonia congesta subsp. congesta)
Synonym
Hemizonia congesta subsp. lutescensNative
Hemizonia congesta subsp. luzulifoliaNative
Hemizonia congesta subsp. tracyiTRACY'S TARPLANTNative
Hemizonia congesta subsp. vernalis
(Under Hemizonia congesta subsp. congesta)
Synonym
Hemizonia conjugens
(Under Deinandra conjugens)
Synonym
Hemizonia corymbosa
(Under Deinandra corymbosa)
Synonym
Hemizonia corymbosa subsp. macrocephala
(Under Deinandra corymbosa)
Synonym
Hemizonia fasciculata
(Under Deinandra fasciculata)
Synonym
Hemizonia fitchii
(Under Centromadia fitchii)
Synonym
Hemizonia floribunda
(Under Deinandra floribunda)
Synonym
Hemizonia halliana
(Under Deinandra halliana)
Synonym
Hemizonia increscens subsp. foliosa
(Under Deinandra paniculata)
Synonym
Hemizonia increscens subsp. increscens
(Under Deinandra increscens subsp. increscens)
Synonym
Hemizonia increscens subsp. villosa
(Under Deinandra increscens subsp. villosa)
Synonym
Hemizonia kelloggii
(Under Deinandra kelloggii)
Synonym
Hemizonia lobbii
(Under Deinandra lobbii)
Synonym
Hemizonia lutescens
(Under Hemizonia congesta subsp. lutescens)
Synonym
Hemizonia luzulifolia
(Under Hemizonia congesta subsp. luzulifolia)
Synonym
Hemizonia luzulifolia subsp. luzulifolia
(Under Hemizonia congesta subsp. luzulifolia)
Synonym
Hemizonia luzulifolia subsp. rudis
(Under Hemizonia congesta subsp. luzulifolia)
Synonym
Hemizonia minthornii
(Under Deinandra minthornii)
Synonym
Hemizonia mohavensis
(Under Deinandra mohavensis)
Synonym
Hemizonia oppositifolia
(Under Calycadenia oppositifolia)
Synonym
Hemizonia pallida
(Under Deinandra pallida)
Synonym
Hemizonia paniculata
(Under Deinandra paniculata)
Synonym
Hemizonia parryi
(Under Centromadia parryi)
Synonym
Hemizonia parryi subsp. australis
(Under Centromadia parryi subsp. australis)
Synonym
Hemizonia parryi subsp. congdonii
(Under Centromadia parryi subsp. congdonii)
Synonym
Hemizonia parryi subsp. parryi
(Under Centromadia parryi subsp. parryi)
Synonym
Hemizonia parryi subsp. rudis
(Under Centromadia parryi subsp. rudis)
Synonym
Hemizonia pentactis
(Under Deinandra pentactis)
Synonym
Hemizonia pungens
(Under Centromadia pungens)
Synonym
Hemizonia pungens subsp. laevis
(Under Centromadia pungens subsp. laevis)
Synonym
Hemizonia pungens subsp. maritima
(Under Centromadia pungens subsp. pungens)
Synonym
Hemizonia pungens subsp. septentrionalis
(Under Centromadia pungens subsp. pungens)
Synonym
HeracleumHOGWEED
Heracleum lanatum
(Under Heracleum maximum)
Synonym
Heracleum maximumCOW PARSNIP, GIANT HOGWEEDNative
HerissantiaBLADDER MALLOW
Herissantia crispaCURLY HERISSANTIANative
Hermidium alipes
(Under Mirabilis alipes)
Synonym
HerniariaRUPTUREWORT
Herniaria cinerea
(Under Herniaria hirsuta var. cinerea)
Synonym
Herniaria hirsuta
  ↳  Key to Herniaria hirsuta
Naturalized
Herniaria hirsuta subsp. cinerea
(Under Herniaria hirsuta var. cinerea)
Synonym
Herniaria hirsuta subsp. hirsuta
(Under Herniaria hirsuta var. hirsuta)
Synonym
Herniaria hirsuta var. cinereaNaturalized
Herniaria hirsuta var. hirsutaNaturalized
Hesperevax
  ↳  Key to Hesperevax
Hesperevax acaulisDWARF EVAXNative
Hesperevax acaulis var. acaulisSTEMLESS EVAXNative
Hesperevax acaulis var. ambusticolaFIRE EVAXNative
Hesperevax acaulis var. robustiorNative
Hesperevax caulescensHOGWALLOW STARFISHNative
Hesperevax sparsifloraERECT EVAXNative
Hesperevax sparsiflora var. brevifoliaSHORTLEAVED EVAXNative
Hesperevax sparsiflora var. sparsifloraNative
Hesperidanthus
Hesperidanthus jaegeriNative
HesperisROCKET
Hesperis matronalisDAME'S ROCKETNaturalized
HesperocallisDESERT LILY
Hesperocallis undulataNative
Hesperochiron
  ↳  Key to Hesperochiron
Hesperochiron californicusNative
Hesperochiron californicus var. benthamianus
(Under Hesperochiron californicus)
Synonym
Hesperochiron californicus var. incanus
(Under Hesperochiron californicus)
Synonym
Hesperochiron californicus var. lasianthus
(Under Hesperochiron californicus)
Synonym
Hesperochiron californicus var. latifolius
(Under Hesperochiron californicus)
Synonym
Hesperochiron californicus var. leporinus
(Under Hesperochiron californicus)
Synonym
Hesperochiron californicus var. strigosus
(Under Hesperochiron californicus)
Synonym
Hesperochiron californicus var. watsonianus
(Under Hesperochiron californicus)
Synonym
Hesperochiron campanulatus
(Under Hesperochiron pumilus)
Synonym
Hesperochiron ciliatus
(Under Hesperochiron pumilus)
Synonym
Hesperochiron latifolius
(Under Hesperochiron californicus)
Synonym
Hesperochiron nanus
(Under Hesperochiron californicus)
Synonym
Hesperochiron pumilusNative
Hesperochiron pumilus f. fulcratus
(Under Hesperochiron pumilus)
Synonym
Hesperochiron pumilus f. hirtellus
(Under Hesperochiron pumilus)
Synonym
Hesperochiron pumilus f. nervosus
(Under Hesperochiron pumilus)
Synonym
Hesperochiron pumilus f. villosulus
(Under Hesperochiron pumilus)
Synonym
Hesperochiron pumilus var. ciliatus
(Under Hesperochiron pumilus)
Synonym
Hesperochiron pumilus var. vestitus
(Under Hesperochiron pumilus)
Synonym
Hesperochloa kingii
(Under Festuca kingii)
Synonym
HesperocnideWESTERN NETTLE
Hesperocnide tenellaNative
Hesperocyparis
  ↳  Key to Hesperocyparis
WESTERN CYPRESS
Hesperocyparis abramsianaSANTA CRUZ CYPRESSNative
Hesperocyparis abramsiana var. abramsianaNative
Hesperocyparis abramsiana var. butanoensisNative
Hesperocyparis bakeriBAKER CYPRESS, SISKIYOU CYPRESSNative
Hesperocyparis forbesiiTECATE CYPRESSNative
Hesperocyparis govenianaGOWEN CYPRESSNative
Hesperocyparis macnabianaMCNAB CYPRESSNative
Hesperocyparis macrocarpaMONTEREY CYPRESSNative
Hesperocyparis nevadensisPIUTE CYPRESSNative
Hesperocyparis pygmaeaPYGMY CYPRESSNative
Hesperocyparis revealiana
(Under Hesperocyparis stephensonii)
Synonym
Hesperocyparis sargentiiSARGENT CYPRESSNative
Hesperocyparis stephensoniiCUYAMACA CYPRESSNative
Hesperolinon
  ↳  Key to Hesperolinon
WESTERN FLAX
Hesperolinon adenophyllumGLANDULAR WESTERN FLAXNative
Hesperolinon bicarpellatumTWO-CARPELLATE WESTERN FLAXNative
Hesperolinon breweriBREWER'S WESTERN FLAXNative
Hesperolinon californicumNative
Hesperolinon clevelandiiNative
Hesperolinon congestumMARIN WESTERN FLAXNative
Hesperolinon didymocarpumLAKE COUNTY WESTERN FLAXNative
Hesperolinon disjunctumNative
Hesperolinon drymarioidesDRYMARIA-LIKE WESTERN FLAXNative
Hesperolinon micranthumNative
Hesperolinon serpentinum
(Under Hesperolinon)
Mentioned in
a note
Hesperolinon sharsmithiae
(Under Hesperolinon bicarpellatum)
Mentioned in
a note
Hesperolinon spergulinumNative
Hesperolinon tehamenseTEHAMA COUNTY WESTERN FLAXNative
Hesperomecon
Hesperomecon filiformis
(Under Hesperomecon linearis)
Synonym
Hesperomecon linearisNative
Hesperoscordum aridum
(Under Triteleia hyacinthina)
Synonym
Hesperoscordum hyacinthinum
(Under Triteleia hyacinthina)
Synonym
Hesperoscordum lacteum
(Under Triteleia hyacinthina)
Synonym
Hesperoscordum lewisii
(Under Triteleia hyacinthina)
Synonym
Hesperoscordum lilacinum
(Under Triteleia lilacina)
Synonym
Hesperoscordum maritimum
(Under Muilla maritima)
Synonym
Hesperostipa comata
(Under Stipa comata)
Synonym
Hesperostipa comata subsp. comata
(Under Stipa comata var. comata)
Synonym
Hesperostipa comata subsp. intermedia
(Under Stipa comata var. intermedia)
Synonym
HesperoyuccaQUIXOTE PLANT, CHAPARRAL YUCCA
Hesperoyucca whippleiNative
Hesperoyucca whipplei var. graminifolia
(Under Hesperoyucca whipplei)
Synonym
Heteranthemis
Heteranthemis viscidehirta
(Under Heteranthemis viscidihirta)
Synonym
Heteranthemis viscidihirtaNaturalized
Heteranthera
  ↳  Key to Heteranthera
MUD PLANTAIN
Heteranthera dubiaWATER STAR-GRASSNative
Heteranthera limosaNaturalized
Heteranthera rotundifolia
(Under Heteranthera)
Mentioned in
a note
Heterocodon
Heterocodon rariflorumNative
Heterodraba unilateralis
(Under Athysanus unilateralis)
Synonym
Heterogaura heterandra
(Under Clarkia heterandra)
Synonym
HeteromelesCHRISTMAS BERRY, TOYON
Heteromeles arbutifoliaNative
Heteromeles arbutifolia var. arbutifolia
(Under Heteromeles arbutifolia)
Synonym
Heteromeles arbutifolia var. cerina
(Under Heteromeles arbutifolia)
Synonym
Heteromeles arbutifolia var. macrocarpa
(Under Heteromeles arbutifolia)
Synonym
Heteromeles salicifolia
(Under Heteromeles arbutifolia)
Synonym
Heteropogon
Heteropogon contortusTANGLEHEADNaturalized
Heterotheca
  ↳  Key to Heterotheca
GOLDENASTER, TELEGRAPH WEED
Heterotheca echioides var. bolanderi
(Under Heterotheca sessiliflora subsp. bolanderi)
Synonym
Heterotheca grandifloraTELEGRAPH WEEDNative
Heterotheca monarchensisMONARCH GOLDENASTERNative
Heterotheca oregonaRAYLESS GOLDENASTERNative
Heterotheca oregona var. compactaNative
Heterotheca oregona var. oregonaNative
Heterotheca oregona var. rudisNative
Heterotheca oregona var. scaberrimaNative
Heterotheca psammophila
(Under Heterotheca subaxillaris subsp. latifolia)
Synonym
Heterotheca sessilifloraSESSILEFLOWER GOLDENASTERNative
Heterotheca sessiliflora subsp. bolanderiNative
Heterotheca sessiliflora subsp. echioidesNative
Heterotheca sessiliflora subsp. fastigiataNative
Heterotheca sessiliflora subsp. sessilifloraBEACH GOLDENASTERNative
Heterotheca sessiliflora var. bolanderioides
(Under Heterotheca sessiliflora subsp. echioides)
Mentioned in
a note
Heterotheca sessiliflora var. echioides
(Under Heterotheca sessiliflora subsp. echioides)
Synonym
Heterotheca sessiliflora var. fastigiata
(Under Heterotheca sessiliflora subsp. fastigiata)
Synonym
Heterotheca sessiliflora var. sanjacintensis
(Under Heterotheca sessiliflora subsp. fastigiata)
Mentioned in
a note
Heterotheca sessiliflora var. sessiliflora
(Under Heterotheca sessiliflora subsp. sessiliflora)
Synonym
Heterotheca shevockiiSHEVOCK'S GOLDENASTERNative
Heterotheca subaxillaris subsp. latifoliaCAMPHOR-WEEDNative
Heterotheca villosaHAIRY GOLDENASTERNative
Heterotheca villosa var. hispida
(Under Heterotheca villosa var. minor)
Synonym
Heterotheca villosa var. minorNative
Heterotheca villosa var. scabraNative
Heterotheca villosa var. shevockii
(Under Heterotheca shevockii)
Synonym
Heterotheca villosa var. villosa
(Under Heterotheca villosa var. minor)
Synonym
Hetherotheca echioides var. bolanderioides
(Under Heterotheca sessiliflora subsp. echioides)
Mentioned in
a note
Hetherotheca sessiliflora var. camphorata
(Under Heterotheca sessiliflora subsp. echioides)
Mentioned in
a note
Heuchera
  ↳  Key to Heuchera
ALUMROOT
Heuchera abramsiiABRAMS' ALUMROOTNative
Heuchera brevistamineaLAGUNA MOUNTAINS ALUMROOTNative
Heuchera caespitosaNative
Heuchera cespitosa
(Under Heuchera caespitosa)
Synonym
Heuchera cylindricaNative
Heuchera cylindrica var. alpina
(Under Heuchera cylindrica)
Synonym
Heuchera duranii
(Under Heuchera parvifolia)
Synonym
Heuchera elegans
(Under Heuchera caespitosa)
Synonym
Heuchera hirsutissimaSHAGGY-HAIRED ALUMROOTNative
Heuchera maximaISLAND ALUMROOTNative
Heuchera merriamiiNative
Heuchera micranthaNative
Heuchera micrantha var. diversifolia
(Under Heuchera micrantha)
Synonym
Heuchera micrantha var. erubescens
(Under Heuchera micrantha)
Synonym
Heuchera micrantha var. hartwegii
(Under Heuchera micrantha)
Synonym
Heuchera micrantha var. macropetala
(Under Heuchera micrantha)
Synonym
Heuchera parishiiPARISH'S ALUMROOTNative
Heuchera parvifoliaNative
Heuchera pilosissimaNative
Heuchera rubescensNative
Heuchera rubescens var. abramsii
(Under Heuchera abramsii)
Synonym
Heuchera rubescens var. alpicola
(Under Heuchera rubescens)
Synonym
Heuchera rubescens var. glandulosa
(Under Heuchera rubescens)
Synonym
Heuchera rubescens var. parishii
(Under Heuchera parishii)
Synonym
Heuchera rubescens var. rydbergiana
(Under Heuchera rubescens)
Synonym
Heuchera rubescens var. versicolor
(Under Heuchera rubescens)
Synonym
Hibiscus
  ↳  Key to Hibiscus
HIBISCUS
Hibiscus californicus
(Under Hibiscus lasiocarpos var. occidentalis)
Synonym
Hibiscus denudatusPALE FACENative
Hibiscus denundatus var. involucellatus
(Under Hibiscus denudatus)
Synonym
Hibiscus lasiocarpos var. californicus
(Under Hibiscus lasiocarpos var. occidentalis)
Synonym
Hibiscus lasiocarpos var. lasiocarpos
(Under Hibiscus lasiocarpos var. occidentalis)
Mentioned in
a note
Hibiscus lasiocarpos var. occidentalisWOOLLY ROSE-MALLOWNative
Hibiscus lasiocarpus
(Under Hibiscus lasiocarpos var. occidentalis)
Synonym
Hibiscus moscheutos var. occidentalis
(Under Hibiscus lasiocarpos var. occidentalis)
Synonym
Hibiscus syriacus
(Under Hibiscus)
Mentioned in
a note
Hibiscus trionumFLOWER-OF-AN-HOURNaturalized
Hieracium
  ↳  Key to Hieracium
HAWKWEED
Hieracium albertinum
(Under Hieracium scouleri)
Synonym
Hieracium albiflorumWHITE HAWKWEEDNative
Hieracium argutumSOUTHERN HAWKWEEDNative
Hieracium argutum var. parishii
(Under Hieracium argutum)
Synonym
Hieracium aurantiacumORANGE HAWKWEEDWaif
Hieracium bolanderiBOLANDER'S HAWKWEEDNative
Hieracium gracile
(Under Hieracium triste)
Synonym
Hieracium greeneiGREENE'S HAWKWEEDNative
Hieracium horridumPRICKLY HAWKWEEDNative
Hieracium nudicauleNAKED-STEMMED HAWKWEEDNative
Hieracium parryiPARRY'S HAWKWEEDNative
Hieracium scouleriWESTERN HAWKWEEDNative
Hieracium scouleri var. albertinum
(Under Hieracium scouleri)
Synonym
Hieracium scouleri var. griseum
(Under Hieracium scouleri)
Synonym
Hieracium tristeSLENDER HAWKWEEDNative
Hierochloe hirta
(Under Anthoxanthum nitens subsp. nitens)
Synonym
Hierochloe occidentalis
(Under Anthoxanthum occidentale)
Synonym
Hierochloe odorata
(Under Anthoxanthum nitens subsp. nitens)
Synonym
Hilaria
  ↳  Key to Hilaria
Hilaria jamesiiGALLETANative
Hilaria rigidaBIG GALLETANative
HippurisMARE'S-TAIL
Hippuris vulgarisNative
HirschfeldiaPERENNIAL, SHORTPOD, or SUMMER MUSTARD
Hirschfeldia incanaNaturalized
Hoffmannseggia
  ↳  Key to Hoffmannseggia
Hoffmannseggia densiflora
(Under Hoffmannseggia glauca)
Synonym
Hoffmannseggia glaucaPIG-NUT, HOG POTATONative
Hoffmannseggia microphyllaNative
Hofmeisteria pluriseta
(Under Pleurocoronis pluriseta)
Synonym
Hoita
  ↳  Key to Hoita
LEATHER ROOT
Hoita hallii
(Under Rupertia hallii)
Synonym
Hoita macrostachyaNative
Hoita orbicularisNative
Hoita rigida
(Under Rupertia rigida)
Synonym
Hoita strobilinaLOMA PRIETA HOITANative
Holacantha emoryi
(Under Castela emoryi)
Synonym
Holcus
  ↳  Key to Holcus
VELVET GRASS
Holcus lanatusCOMMON VELVET GRASSNaturalized
Holcus mollisCREEPING VELVET GRASSNaturalized
Hollisteria
Hollisteria lanataFALSE SPIKEFLOWERNative
Holmgrenanthe
Holmgrenanthe petrophilaROCK LADYNative
Holmgrenia andina
(Under Neoholmgrenia andina)
Synonym
Holocarpha
  ↳  Key to Holocarpha
TARWEED, TARPLANT
Holocarpha heermanniiNative
Holocarpha macradeniaSANTA CRUZ TARPLANTNative
Holocarpha obconicaNative
Holocarpha obconica subsp. autumnalis
(Under Holocarpha obconica)
Synonym
Holocarpha virgataNative
Holocarpha virgata subsp. elongataGRACEFUL TARPLANTNative
Holocarpha virgata subsp. virgataNative
Holodiscus
Holodiscus boursieri
(Under Holodiscus discolor)
Mentioned in
a note
Holodiscus discolor
  ↳  Key to Holodiscus discolor
OCEANSPRAYNative
Holodiscus discolor var. discolorNative
Holodiscus discolor var. glabrescensNative
Holodiscus discolor var. microphyllusNative
Holodiscus microphyllus
(Under Holodiscus discolor var. microphyllus)
Synonym
Holodiscus microphyllus var. glabrescens
(Under Holodiscus discolor var. glabrescens)
Synonym
Holodiscus microphyllus var. microphyllus
(Under Holodiscus discolor var. microphyllus)
Synonym
Holodiscus saxicola
(Under Holodiscus discolor)
Synonym
HolosteumJAGGED CHICKWEED
Holosteum umbellatum subsp. umbellatumNaturalized
Holozonia
Holozonia filipesWHITECROWNNative
Homo sapiens
(Under Vinca)
Mentioned in
a note
Hookera bicolor
(Under Triteleia grandiflora)
Synonym
Hookera bridgesii
(Under Triteleia bridgesii)
Synonym
Hookera californica
(Under Brodiaea californica)
Synonym
Hookera congesta
(Under Dichelostemma congestum)
Synonym
Hookera crocea
(Under Triteleia crocea)
Synonym
Hookera douglasii
(Under Triteleia grandiflora)
Synonym
Hookera filifolia
(Under Brodiaea filifolia)
Synonym
Hookera gracilis
(Under Triteleia montana)
Synonym
Hookera grandiflora
(Under Triteleia grandiflora)
Synonym
Hookera howellii
(Under Triteleia grandiflora)
Synonym
Hookera hyacinthina
(Under Triteleia hyacinthina)
Synonym
Hookera hyacinthina var. lactea
(Under Triteleia hyacinthina)
Synonym
Hookera ixioides var. lugens
(Under Triteleia lugens)
Synonym
Hookera laxa
(Under Triteleia laxa)
Synonym
Hookera leptandra
(Under Brodiaea leptandra)
Synonym
Hookera macropoda
(Under Brodiaea terrestris subsp. terrestris)
Synonym
Hookera minor
(Under Brodiaea minor)
Synonym
Hookera multiflora
(Under Dichelostemma multiflorum)
Synonym
Hookera multipedunculata
(Under Brodiaea orcuttii)
Synonym
Hookera orcuttii
(Under Brodiaea orcuttii)
Synonym
Hookera parviflora
(Under Dichelostemma multiflorum)
Synonym
Hookera pauciflora
(Under Dichelostemma capitatum subsp. pauciflorum)
Synonym
Hookera peduncularis
(Under Triteleia peduncularis)
Synonym
Hookera purdyi
(Under Brodiaea minor)
Synonym
Hookera rosea
(Under Brodiaea rosea)
Synonym
Hookera stellaris
(Under Brodiaea stellaris)
Synonym
Hookera synandra
(Under Brodiaea leptandra)
Synonym
Hookera volubilis
(Under Dichelostemma volubile)
Synonym
Hordeum
  ↳  Key to Hordeum
BARLEY
Hordeum arizonicumARIZONA BARLEYNative
Hordeum brachyantherumNative
Hordeum brachyantherum subsp. brachyantherumNORTHERN BARLEYNative
Hordeum brachyantherum subsp. californicumCALIFORNIA BARLEYNative
Hordeum californicum
(Under Hordeum brachyantherum subsp. californicum)
Synonym
Hordeum depressumLOW BARLEY, ALKALI BARLEYNative
Hordeum geniculatum
(Under Hordeum marinum subsp. gussoneanum)
Synonym
Hordeum glaucum
(Under Hordeum murinum subsp. glaucum)
Synonym
Hordeum hystrix
(Under Hordeum marinum subsp. gussoneanum)
Synonym
Hordeum intercedensBOBTAIL BARLEYNative
Hordeum jubatum
(Under Elymus trachycaulus subsp. trachycaulus)
Mentioned in
a note
Hordeum jubatum subsp. jubatumFOXTAIL BARLEY, SQUIRRELTAIL BARLEYNative
Hordeum jubatum var. caespitosum
(Under Hordeum jubatum subsp. jubatum)
Synonym
Hordeum leporinum
(Under Hordeum murinum subsp. leporinum)
Synonym
Hordeum marinum subsp. gussoneanumMEDITERRANEAN BARLEYNaturalized
Hordeum murinumWALL BARLEYNaturalized
Hordeum murinum subsp. glaucumSMOOTH BARLEYNaturalized
Hordeum murinum subsp. leporinumHARE BARLEYNaturalized
Hordeum murinum subsp. murinumNaturalized
Hordeum pusillum
(Under Hordeum intercedens)
Synonym
Hordeum pusillum
(Under Hordeum)
Mentioned in
a note
Hordeum stebbinsii
(Under Hordeum murinum subsp. glaucum)
Synonym
Hordeum vulgareBARLEYWaif
Hordeum vulgare var. trifurcatum
(Under Hordeum vulgare)
Synonym
Hordeum vulgare var. vulgare
(Under Hordeum vulgare)
Synonym
Horkelia
  ↳  Key to Horkelia
Horkelia bolanderiBOLANDER'S HORKELIANative
Horkelia bolanderi subsp. clevelandii
(Under Horkelia clevelandii var. clevelandii)
Synonym
Horkelia bolanderi subsp. parryi
(Under Horkelia rydbergii)
Synonym
Horkelia californicaNative
Horkelia californica subsp. californica
(Under Horkelia californica var. californica)
Synonym
Horkelia californica subsp. dissita
(Under Horkelia californica var. elata)
Synonym
Horkelia californica subsp. frondosa
(Under Horkelia californica var. frondosa)
Synonym
Horkelia californica var. californicaNative
Horkelia californica var. elataNative
Horkelia californica var. frondosaNative
Horkelia chaetophora
(Under Ivesia pygmaea)
Synonym
Horkelia chandleri
(Under Ivesia muirii)
Synonym
Horkelia clevelandii var. brevibracteata
(Under Horkelia clevelandii var. clevelandii)
Mentioned in
a note
Horkelia clevelandii var. clevelandiiNative
Horkelia congesta subsp. nemorosa
(Under Horkelia congesta var. nemorosa)
Synonym
Horkelia congesta var. nemorosaJOSEPHINE HORKELIANative
Horkelia cuneataNative
Horkelia cuneata subsp. cuneata
(Under Horkelia cuneata var. cuneata)
Synonym
Horkelia cuneata subsp. puberula
(Under Horkelia cuneata var. puberula)
Synonym
Horkelia cuneata subsp. sericea
(Under Horkelia cuneata var. sericea)
Synonym
Horkelia cuneata var. cuneataNative
Horkelia cuneata var. puberulaMESA HORKELIANative
Horkelia cuneata var. sericeaKELLOGG'S HORKELIANative
Horkelia daucifoliaNative
Horkelia daucifolia subsp. daucifolia
(Under Horkelia daucifolia var. daucifolia)
Synonym
Horkelia daucifolia subsp. latior
(Under Horkelia daucifolia var. daucifolia)
Synonym
Horkelia daucifolia var. caruifolia
(Under Horkelia daucifolia var. indicta)
Mentioned in
a note
Horkelia daucifolia var. daucifoliaNative
Horkelia daucifolia var. indictaJEPSON'S HORKELIANative
Horkelia elata
(Under Horkelia californica var. elata)
Synonym
Horkelia flavescens
(Under Horkelia tridentata var. flavescens)
Synonym
Horkelia frondosa
(Under Horkelia californica var. frondosa)
Synonym
Horkelia fuscaNative
Horkelia fusca subsp. capitata
(Under Horkelia fusca var. pseudocapitata)
Synonym
Horkelia fusca subsp. parviflora
(Under Horkelia fusca var. parviflora)
Synonym
Horkelia fusca subsp. pseudocapitata
(Under Horkelia fusca var. brownii)
Synonym
Horkelia fusca subsp. pseudocapitata
(Under Horkelia fusca var. pseudocapitata)
Synonym
Horkelia fusca subsp. tenella
(Under Horkelia fusca var. tenella)
Synonym
Horkelia fusca var. browniiNative
Horkelia fusca var. parvifloraNative
Horkelia fusca var. pseudocapitataNative
Horkelia fusca var. tenellaNative
Horkelia glandulosa
(Under Horkelia californica var. elata)
Synonym
Horkelia hendersoniiHENDERSON'S HORKELIANative
Horkelia hispidulaWHITE MOUNTAINS HORKELIANative
Horkelia howelliiHOWELL'S HORKELIANative
Horkelia marinensisPOINT REYES HORKELIANative
Horkelia mollis
(Under Ivesia campestris)
Synonym
Horkelia parryiPARRY'S HORKELIANative
Horkelia rydbergiiNative
Horkelia scandularis
(Under Ivesia lycopodioides var. scandularis)
Synonym
Horkelia sericataSILKY HORKELIANative
Horkelia tenuilobaTHIN-LOBED HORKELIANative
Horkelia tridentataNative
Horkelia tridentata subsp. flavescens
(Under Horkelia tridentata var. flavescens)
Synonym
Horkelia tridentata subsp. tridentata
(Under Horkelia tridentata var. tridentata)
Synonym
Horkelia tridentata var. flavescensNative
Horkelia tridentata var. tridentataNative
Horkelia truncataRAMONA HORKELIANative
Horkelia tularensisKERN PLATEAU HORKELIANative
Horkelia wilderaeBARTON FLATS HORKELIANative
Horkelia yadoniiSANTA LUCIA HORKELIANative
Horkeliella
  ↳  Key to Horkeliella
Horkeliella congdonisNative
Horkeliella purpurascensNative
Hornungia
Hornungia procumbensNaturalized
Horsfordia
  ↳  Key to Horsfordia
Horsfordia alataPINK VELVET-MALLOWNative
Horsfordia newberryiNEWBERRY'S VELVET-MALLOWNative
Hosackia
  ↳  Key to Hosackia
LOTUS
Hosackia bicolor
(Under Hosackia pinnata)
Synonym
Hosackia crassifoliaNative
Hosackia crassifolia var. crassifoliaNative
Hosackia crassifolia var. otayensisOTAY MOUNTAIN HOSACKIANative
Hosackia cuprea
(Under Hosackia oblongifolia var. cuprea)
Synonym
Hosackia gracilisHARLEQUIN LOTUSNative
Hosackia incanaNative
Hosackia oblongifoliaNative
Hosackia oblongifolia var. cupreaCOPPER-FLOWERED BIRD'S-FOOT TREFOILNative
Hosackia oblongifolia var. oblongifoliaNative
Hosackia pinnataNative
Hosackia roseaNative
Hosackia stipularisNative
Hosackia stipularis var. ottleyiNative
Hosackia stipularis var. stipularisNative
Hosackia yollabolliensisYOLLA BOLLY MOUNTAINS BIRD'S-FOOT TREFOILNative
Howellanthus
Howellanthus dalesianusSCOTT MOUNTAIN PHACELIANative
Howellia
Howellia aquatilisWATER HOWELLIANative
Howellia limosa
(Under Legenere limosa)
Synonym
Hulsea
  ↳  Key to Hulsea
Hulsea algidaNative
Hulsea brevifoliaSHORTLEAVED HULSEANative
Hulsea californicaSAN DIEGO SUNFLOWERNative
Hulsea californica subsp. inyoensis
(Under Hulsea vestita subsp. inyoensis)
Synonym
Hulsea heterochromaNative
Hulsea mexicanaMEXICAN HULSEANative
Hulsea nanaLITTLE HULSEANative
Hulsea vestitaNative
Hulsea vestita subsp. callicarphaBEAUTIFUL HULSEANative
Hulsea vestita subsp. gabrielensisSAN GABRIEL MOUNTAINS SUNFLOWERNative
Hulsea vestita subsp. inyoensisINYO HULSEANative
Hulsea vestita subsp. parryiPARRY'S SUNFLOWERNative
Hulsea vestita subsp. pygmaeaPYGMY HULSEANative
Hulsea vestita subsp. vestitaNative
Hulsea vestita var. callicarpha
(Under Hulsea vestita subsp. callicarpha)
Synonym
HumulusHOP
Humulus lupulusEUROPEAN HOPNaturalized
Humulus lupulus var. lupulus
(Under Humulus lupulus)
Synonym
Humulus lupulus var. neomexicanus
(Under Humulus lupulus)
Synonym
Hunnemannia fumariifolia
(Under Papaveraceae)
Mentioned in
a note
Hutchinsia procumbens
(Under Hornungia procumbens)
Synonym
Hydastylus borealis
(Under Sisyrinchium californicum)
Synonym
Hydastylus brachypus
(Under Sisyrinchium californicum)
Synonym
Hydastylus longipes
(Under Sisyrinchium longipes)
Synonym
Hydrangeaceae
  ↳  Key to Hydrangeaceae
HYDRANGEA FAMILY
Hydrilla
Hydrilla verticillataNaturalized
Hydrocharis spongia
(Under Limnobium spongia)
Synonym
Hydrocharitaceae
  ↳  Key to Hydrocharitaceae
WATERWEED FAMILY
Hydrocotyle
  ↳  Key to Hydrocotyle
MARSH PENNYWORT
Hydrocotyle moschata
(Under Hydrocotyle)
Mentioned in
a note
Hydrocotyle ranunculoidesNative
Hydrocotyle sibthorpioides
(Under Hydrocotyle)
Mentioned in
a note
Hydrocotyle umbellataNative
Hydrocotyle verticillataNative
Hydrocotyle verticillata var. triradiata
(Under Hydrocotyle verticillata)
Synonym
Hydrolea urens
(Under Wigandia urens)
Synonym
Hydropeltis purpurea
(Under Brasenia schreberi)
Synonym
Hydrophyllum
  ↳  Key to Hydrophyllum
WATERLEAF
Hydrophyllum albifrons
(Under Hydrophyllum fendleri var. albifrons)
Synonym
Hydrophyllum albifrons var. pendulum
(Under Hydrophyllum fendleri var. albifrons)
Synonym
Hydrophyllum alpestreALPINE BREECHESNative
Hydrophyllum alpinum
(Under Hydrophyllum alpestre)
Mentioned in
a note
Hydrophyllum capitatum var. alpinum
(Under Hydrophyllum alpestre)
Synonym
Hydrophyllum capitatum var. alpinum
(Under Hydrophyllum)
Mentioned in
a note
Hydrophyllum congestum
(Under Hydrophyllum fendleri var. albifrons)
Synonym
Hydrophyllum fendleri var. albifronsWHITE WATERLEAFNative
Hydrophyllum lineare
(Under Phacelia linearis)
Synonym
Hydrophyllum occidentaleWESTERN WATERLEAFNative
Hydrophyllum tenuipesSLENDERFOOT WATERLEAF, PACIFIC WATERLEAFNative
Hydrophyllum viridulum var. viride
(Under Hydrophyllum tenuipes)
Synonym
Hymenoclea monogyra
(Under Ambrosia monogyra)
Synonym
Hymenoclea platyspina
(Under Ambrosia ×platyspina)
Synonym
Hymenoclea salsola var. fasciculata
(Under Ambrosia salsola var. salsola)
Synonym
Hymenoclea salsola var. patula
(Under Ambrosia salsola var. salsola)
Synonym
Hymenoclea salsola var. pentalepis
(Under Ambrosia salsola var. pentalepis)
Synonym
Hymenoclea salsola var. salsola
(Under Ambrosia salsola var. salsola)
Synonym
Hymenolobus procumbens
(Under Hornungia procumbens)
Synonym
Hymenopappus
Hymenopappus filifolius
  ↳  Key to Hymenopappus filifolius
Native
Hymenopappus filifolius var. eriopodusHAIRY-PODDED FINE-LEAF HYMENOPAPPUSNative
Hymenopappus filifolius var. lugensNative
Hymenopappus filifolius var. megacephalusNative
Hymenopappus filifolius var. nanusLITTLE CUTLEAFNative
Hymenothrix
  ↳  Key to Hymenothrix
Hymenothrix dissectaNative
Hymenothrix loomisiiWaif
Hymenothrix wrightiiWRIGHT'S HYMENOTHRIXNative
Hymenoxys
  ↳  Key to Hymenoxys
Hymenoxys acaulis
(Under Hymenoxys)
Mentioned in
a note
Hymenoxys acaulis var. arizonica
(Under Tetraneuris acaulis var. arizonica)
Synonym
Hymenoxys acaulis var. nana
(Under Tetraneuris acaulis var. arizonica)
Synonym
Hymenoxys cooperiNative
Hymenoxys cooperi var. canescens
(Under Hymenoxys cooperi)
Synonym
Hymenoxys hoopesiiNative
Hymenoxys lemmoniiALKALI HYMENOXYSNative
Hymenoxys odorataBITTER HYMENOXYSNative
Hyparrhenia
Hyparrhenia hirtaTHATCHING GRASSNaturalized
HypericaceaeST. JOHN'S WORT FAMILY
Hypericum
  ↳  Key to Hypericum
Hypericum anagalloidesTINKER'S PENNYNative
Hypericum androsaemumWaif
Hypericum calycinumAARON'S BEARDNaturalized
Hypericum canarienseNaturalized
Hypericum concinnumGOLD-WIRENative
Hypericum formosum var. scouleri
(Under Hypericum scouleri)
Synonym
Hypericum hookerianumWaif
Hypericum mutilum
(Under Hypericum anagalloides)
Mentioned in
a note
Hypericum mutilum subsp. mutilumNaturalized
Hypericum perforatum subsp. perforatumKLAMATHWEEDNaturalized
Hypericum scouleriNative
Hypericum scouleri subsp. scouleri
(Under Hypericum scouleri)
Synonym
Hypochaeris
  ↳  Key to Hypochaeris
CAT'S-EAR
Hypochaeris glabraSMOOTH CAT'S-EARNaturalized
Hypochaeris radicataROUGH CAT'S-EARNaturalized
Hypopitys fimbriata
(Under Monotropa hypopitys)
Synonym
Hypopitys lanuginosa
(Under Monotropa hypopitys)
Synonym
Hypopitys monotropa
(Under Monotropa hypopitys)
Synonym
Hyptis emoryi
(Under Condea emoryi)
Synonym
Hystrix californica
(Under Elymus californicus)
Synonym