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Key to families Table of families and genera
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Scientific Name

Index Page: H

Scientific NameCommon Name
Habenaria dilatata var. leucostachys
(Under Platanthera dilatata var. leucostachys)
Synonym (tjm2)
Habenaria elegans var. elata
(Under Piperia elongata)
Synonym (tjm2)
Habenaria elegans var. maritima
(Under Piperia elegans subsp. elegans)
Synonym (tjm2)
Habenaria elegans var. multiflora
(Under Piperia elegans subsp. elegans)
Synonym (tjm2)
Habenaria greenei
(Under Piperia elegans subsp. elegans)
Synonym (tjm2)
Habenaria leucostachys var. virida
(Under Platanthera sparsiflora)
Synonym (tjm2)
Habenaria saccata
(Under Platanthera stricta)
Synonym (tjm2)
Habenaria unalascensis
(Under Piperia unalascensis)
Synonym (tjm2)
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 (tjm2)
Hackelia longituba
(Under Hackelia velutina)
Synonym (tjm2)
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 (tjm2)
Halimodendron
Halimodendron halodendronRUSSIAN SALT TREEAgricultural weed
Halimolobos
Halimolobos diffusa var. jaegeri
(Under Halimolobos jaegeri)
Synonym (tjm2)
Halimolobos jaegeriNative
Halimolobos virgata
(Under Halimolobos jaegeri)
Mentioned in
a note
Halimolobos virgata
(Under Transberingia bursifolia subsp. virgata)
Synonym (tjm2)
Halogeton
Halogeton glomeratusSALTLOVERNaturalized
HaloragaceaeWATER-MILFOIL FAMILY
Haloragis erecta
(Under Haloragaceae)
Mentioned in
a note
Haplopappus acaulis
(Under Stenotus acaulis)
Synonym (tjm2)
Haplopappus acradenius subsp. bracteosus
(Under Isocoma acradenia var. bracteosa)
Synonym (tjm2)
Haplopappus acradenius subsp. eremophilus
(Under Isocoma acradenia var. eremophila)
Synonym (tjm2)
Haplopappus apargioides
(Under Pyrrocoma apargioides)
Synonym (tjm2)
Haplopappus arborescens
(Under Ericameria arborescens)
Synonym (tjm2)
Haplopappus bloomeri
(Under Ericameria bloomeri)
Synonym (tjm2)
Haplopappus brickellioides
(Under Hazardia brickellioides)
Synonym (tjm2)
Haplopappus canus
(Under Hazardia cana)
Synonym (tjm2)
Haplopappus carthamoides subsp. cusickii
(Under Pyrrocoma carthamoides var. cusickii)
Synonym (tjm2)
Haplopappus cuneatus var. spathulatus
(Under Ericameria cuneata var. spathulata)
Synonym (tjm2)
Haplopappus eastwoodiae
(Under Ericameria fasciculata)
Synonym (tjm2)
Haplopappus ericoides
(Under Ericameria ericoides)
Synonym (tjm2)
Haplopappus ericoides subsp. blakei
(Under Ericameria ericoides)
Synonym (tjm2)
Haplopappus eximius
(Under Tonestus eximius)
Synonym (tjm2)
Haplopappus eximius subsp. peirsonii
(Under Tonestus peirsonii)
Synonym (tjm2)
Haplopappus gilmanii
(Under Ericameria gilmanii)
Synonym (tjm2)
Haplopappus greenei
(Under Ericameria greenei)
Synonym (tjm2)
Haplopappus hirtus subsp. hirtus
(Under Pyrrocoma hirta var. hirta)
Synonym (tjm2)
Haplopappus hirtus subsp. lanulosus
(Under Pyrrocoma hirta var. lanulosa)
Synonym (tjm2)
Haplopappus hirtus var. lanulosus
(Under Pyrrocoma hirta var. lanulosa)
Synonym (tjm2)
Haplopappus lanceolatus
(Under Pyrrocoma lanceolata var. lanceolata)
Synonym (tjm2)
Haplopappus lanceolatus subsp. tenuicaulis
(Under Pyrrocoma lanceolata var. lanceolata)
Synonym (tjm2)
Haplopappus laricifolius
(Under Ericameria laricifolia)
Synonym (tjm2)
Haplopappus linearifolius
(Under Ericameria linearifolia)
Synonym (tjm2)
Haplopappus lucidus
(Under Pyrrocoma lucida)
Synonym (tjm2)
Haplopappus lyallii
(Under Tonestus lyallii)
Synonym (tjm2)
Haplopappus macronema
(Under Ericameria discoidea)
Synonym (tjm2)
Haplopappus nanus
(Under Ericameria nana)
Synonym (tjm2)
Haplopappus occidentalis
(Under Benitoa occidentalis)
Synonym (tjm2)
Haplopappus ophitidis
(Under Ericameria ophitidis)
Synonym (tjm2)
Haplopappus peirsonii
(Under Tonestus peirsonii)
Synonym (tjm2)
Haplopappus pinifolius
(Under Ericameria pinifolia)
Synonym (tjm2)
Haplopappus propinquus
(Under Ericameria brachylepis)
Synonym (tjm2)
Haplopappus racemosus subsp. congestus
(Under Pyrrocoma racemosa var. congesta)
Synonym (tjm2)
Haplopappus racemosus subsp. glomeratus
(Under Pyrrocoma racemosa var. paniculata)
Synonym (tjm2)
Haplopappus racemosus subsp. pinetorum
(Under Pyrrocoma racemosa var. pinetorum)
Synonym (tjm2)
Haplopappus racemosus subsp. sessiliflorus
(Under Pyrrocoma racemosa var. sessiliflora)
Synonym (tjm2)
Haplopappus squarrosus subsp. grindelioides
(Under Hazardia squarrosa var. grindelioides)
Synonym (tjm2)
Haplopappus squarrosus subsp. obtusus
(Under Hazardia squarrosa var. obtusa)
Synonym (tjm2)
Haplopappus squarrosus subsp. stenolepis
(Under Hazardia stenolepis)
Synonym (tjm2)
Haplopappus stenophyllus
(Under Nestotus stenophyllus)
Synonym (tjm2)
Haplopappus suffruticosus
(Under Ericameria suffruticosa)
Synonym (tjm2)
Haplopappus uniflorus subsp. gossypinus
(Under Pyrrocoma uniflora var. gossypina)
Synonym (tjm2)
Haplopappus venetus subsp. argutus
(Under Isocoma arguta)
Synonym (tjm2)
Haplopappus venetus subsp. furfuraceus
(Under Isocoma menziesii var. menziesii)
Synonym (tjm2)
Haplopappus whitneyi subsp. discoideus
(Under Hazardia whitneyi var. discoidea)
Synonym (tjm2)
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 (tjm2)
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 (tjm2)
Hedypnois rhagadioloidesCRETE WEEDNaturalized
Heleniastrum autumnale
(Under Helenium autumnale)
Synonym (tjm2)
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 (tjm2)
Helenium amarum var. amarumNaturalized
Helenium autumnaleNative
Helenium autumnale var. canaliculatum
(Under Helenium autumnale)
Synonym (tjm2)
Helenium autumnale var. fylesii
(Under Helenium autumnale)
Synonym (tjm2)
Helenium autumnale var. grandiflorum
(Under Helenium autumnale)
Synonym (tjm2)
Helenium autumnale var. montanum
(Under Helenium autumnale)
Synonym (tjm2)
Helenium autumnale var. parviflorum
(Under Helenium autumnale)
Synonym (tjm2)
Helenium bigeloviiNative
Helenium bigelovii var. festivum
(Under Helenium bolanderi)
Synonym
Helenium bolanderiNative
Helenium californicum
(Under Helenium puberulum)
Synonym
Helenium canaliculatum
(Under Helenium autumnale)
Synonym (tjm2)
Helenium decurrens
(Under Helenium puberulum)
Synonym
Helenium edwardsianum
(Under Helenium autumnale)
Synonym (tjm2)
Helenium grandiflorum
(Under Helenium autumnale)
Synonym (tjm2)
Helenium hoopesii
(Under Hymenoxys hoopesii)
Synonym (tjm2)
Helenium huronense
(Under Helenium autumnale)
Synonym (tjm2)
Helenium latifolium
(Under Helenium autumnale)
Synonym (tjm2)
Helenium macranthum
(Under Helenium autumnale)
Synonym (tjm2)
Helenium montanum
(Under Helenium autumnale)
Synonym (tjm2)
Helenium parviflorum
(Under Helenium autumnale)
Synonym (tjm2)
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 (tjm2)
Helianthella
  ↳  Key to Helianthella
Helianthella californicaNative
Helianthella californica subsp. californica
(Under Helianthella californica var. californica)
Synonym (tjm2)
Helianthella californica subsp. nevadensis
(Under Helianthella californica var. nevadensis)
Synonym (tjm2)
Helianthella californica subsp. shastensis
(Under Helianthella californica var. shastensis)
Synonym (tjm2)
Helianthella californica var. californicaNative
Helianthella californica var. nevadensisNative
Helianthella californica var. shastensisNative
Helianthella castaneaDIABLO HELIANTHELLANative
Helianthemum aldersonii
(Under Crocanthemum aldersonii)
Synonym (tjm2)
Helianthemum greenei
(Under Crocanthemum greenei)
Synonym (tjm2)
Helianthemum guttatum
(Under Tuberaria guttata)
Synonym (tjm2)
Helianthemum mendocinensis
(Under Crocanthemum scoparium var. scoparium)
Mentioned in
a note
Helianthemum scoparium
(Under Crocanthemum aldersonii)
Synonym (tjm2)
Helianthemum scoparium
(Under Crocanthemum scoparium)
Synonym (tjm2)
Helianthemum scoparium
(Under Crocanthemum scoparium var. scoparium)
Synonym (tjm2)
Helianthemum scoparium
(Under Crocanthemum scoparium var. vulgare)
Synonym (tjm2)
Helianthemum scoparium
(Under Crocanthemum suffrutescens)
Synonym (tjm2)
Helianthemum scoparium var. aldersonii
(Under Crocanthemum aldersonii)
Synonym (tjm2)
Helianthemum scoparium var. scoparium
(Under Crocanthemum scoparium var. scoparium)
Synonym (tjm2)
Helianthemum scoparium var. vulgare
(Under Crocanthemum scoparium var. vulgare)
Synonym (tjm2)
Helianthemum suffrutescens
(Under Crocanthemum suffrutescens)
Synonym (tjm2)
Helianthus
  ↳  Key to Helianthus
SUNFLOWER
Helianthus annuusNative
Helianthus annuus subsp. jaegeri
(Under Helianthus annuus)
Synonym (tjm2)
Helianthus annuus subsp. lenticularis
(Under Helianthus annuus)
Synonym (tjm2)
Helianthus annuus var. macrocarpus
(Under Helianthus annuus)
Synonym (tjm2)
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 (tjm2)
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 (tjm2)
Heliotropium convolvulaceum var. californicumMORNING-GLORY HELIOTROPENative
Heliotropium curassavicum var. oculatumSEASIDE HELIOTROPE, ALKALI HELIOTROPENative
Heliotropium europaeumEUROPEAN HELIOTROPENaturalized
Heliotropium oculatum
(Under Heliotropium curassavicum var. oculatum)
Synonym (tjm2)
Heliotropium spathulatum subsp. oculatum
(Under Heliotropium curassavicum var. oculatum)
Synonym (tjm2)
HelminthothecaOX-TONGUE
Helminthotheca echioidesBRISTLY OX-TONGUENaturalized
Helxine soleirolii
(Under Soleirolia soleirolii)
Synonym (tjm2)
Hemicarpha micrantha
(Under Lipocarpha micrantha)
Synonym (tjm2)
Hemicarpha micrantha var. aristulata
(Under Lipocarpha aristulata)
Synonym (tjm2)
Hemicarpha micrantha var. minor
(Under Lipocarpha micrantha)
Synonym (tjm2)
Hemicarpha occidentalis
(Under Lipocarpha occidentalis)
Synonym (tjm2)
Hemieva
Hemieva ranunculifoliaNative
HemitomesGNOME PLANT
Hemitomes congestumNative
HemizonellaMINIATURE TARWEED
Hemizonella minimaNative
HemizoniaHAYFIELD TARWEED
Hemizonia angustifolia
(Under Deinandra corymbosa)
Synonym (tjm2)
Hemizonia arida
(Under Deinandra arida)
Synonym (tjm2)
Hemizonia calyculata
(Under Hemizonia congesta subsp. calyculata)
Synonym (tjm2)
Hemizonia clementina
(Under Deinandra clementina)
Synonym (tjm2)
Hemizonia clevelandii
(Under Hemizonia congesta subsp. clevelandii)
Synonym (tjm2)
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 (tjm2)
Hemizonia congesta subsp. leucocephala
(Under Hemizonia congesta subsp. congesta)
Synonym (tjm2)
Hemizonia congesta subsp. lutescensNative
Hemizonia congesta subsp. luzulifoliaNative
Hemizonia congesta subsp. tracyiTRACY'S TARPLANTNative
Hemizonia congesta subsp. vernalis
(Under Hemizonia congesta subsp. congesta)
Synonym (tjm2)
Hemizonia conjugens
(Under Deinandra conjugens)
Synonym (tjm2)
Hemizonia corymbosa
(Under Deinandra corymbosa)
Synonym (tjm2)
Hemizonia corymbosa subsp. macrocephala
(Under Deinandra corymbosa)
Synonym (tjm2)
Hemizonia fasciculata
(Under Deinandra fasciculata)
Synonym (tjm2)
Hemizonia fitchii
(Under Centromadia fitchii)
Synonym (tjm2)
Hemizonia floribunda
(Under Deinandra floribunda)
Synonym (tjm2)
Hemizonia halliana
(Under Deinandra halliana)
Synonym (tjm2)
Hemizonia increscens subsp. foliosa
(Under Deinandra paniculata)
Synonym (tjm2)
Hemizonia increscens subsp. increscens
(Under Deinandra increscens subsp. increscens)
Synonym (tjm2)
Hemizonia increscens subsp. villosa
(Under Deinandra increscens subsp. villosa)
Synonym (tjm2)
Hemizonia kelloggii
(Under Deinandra kelloggii)
Synonym (tjm2)
Hemizonia lobbii
(Under Deinandra lobbii)
Synonym (tjm2)
Hemizonia lutescens
(Under Hemizonia congesta subsp. lutescens)
Synonym (tjm2)
Hemizonia luzulifolia
(Under Hemizonia congesta subsp. luzulifolia)
Synonym (tjm2)
Hemizonia luzulifolia subsp. luzulifolia
(Under Hemizonia congesta subsp. luzulifolia)
Synonym (tjm2)
Hemizonia luzulifolia subsp. rudis
(Under Hemizonia congesta subsp. luzulifolia)
Synonym (tjm2)
Hemizonia minthornii
(Under Deinandra minthornii)
Synonym (tjm2)
Hemizonia mohavensis
(Under Deinandra mohavensis)
Synonym (tjm2)
Hemizonia oppositifolia
(Under Calycadenia oppositifolia)
Synonym (tjm2)
Hemizonia pallida
(Under Deinandra pallida)
Synonym (tjm2)
Hemizonia paniculata
(Under Deinandra paniculata)
Synonym (tjm2)
Hemizonia parryi
(Under Centromadia parryi)
Synonym (tjm2)
Hemizonia parryi subsp. australis
(Under Centromadia parryi subsp. australis)
Synonym (tjm2)
Hemizonia parryi subsp. congdonii
(Under Centromadia parryi subsp. congdonii)
Synonym (tjm2)
Hemizonia parryi subsp. parryi
(Under Centromadia parryi subsp. parryi)
Synonym (tjm2)
Hemizonia parryi subsp. rudis
(Under Centromadia parryi subsp. rudis)
Synonym (tjm2)
Hemizonia pentactis
(Under Deinandra pentactis)
Synonym (tjm2)
Hemizonia pungens
(Under Centromadia pungens)
Synonym (tjm2)
Hemizonia pungens subsp. laevis
(Under Centromadia pungens subsp. laevis)
Synonym (tjm2)
Hemizonia pungens subsp. maritima
(Under Centromadia pungens subsp. pungens)
Synonym (tjm2)
Hemizonia pungens subsp. septentrionalis
(Under Centromadia pungens subsp. pungens)
Synonym (tjm2)
HeracleumHOGWEED
Heracleum lanatum
(Under Heracleum maximum)
Synonym (tjm2)
Heracleum maximumCOW PARSNIP, GIANT HOGWEEDNative
HerissantiaBLADDER MALLOW
Herissantia crispaCURLY HERISSANTIANative
Hermidium alipes
(Under Mirabilis alipes)
Synonym (tjm2)
HerniariaRUPTUREWORT
Herniaria cinerea
(Under Herniaria hirsuta var. cinerea)
Synonym (tjm2)
Herniaria hirsuta
  ↳  Key to Herniaria hirsuta
Naturalized
Herniaria hirsuta subsp. cinerea
(Under Herniaria hirsuta var. cinerea)
Synonym (tjm2)
Herniaria hirsuta subsp. hirsuta
(Under Herniaria hirsuta var. hirsuta)
Synonym (tjm2)
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 subvar. lasianthus
(Under Hesperochiron californicus)
Synonym (tjm2)
Hesperochiron californicus subvar. leporinus
(Under Hesperochiron californicus)
Synonym (tjm2)
Hesperochiron californicus var. benthamianus
(Under Hesperochiron californicus)
Synonym (tjm2)
Hesperochiron californicus var. incanus
(Under Hesperochiron californicus)
Synonym (tjm2)
Hesperochiron californicus var. latifolius
(Under Hesperochiron californicus)
Synonym (tjm2)
Hesperochiron californicus var. strigosus
(Under Hesperochiron californicus)
Synonym (tjm2)
Hesperochiron californicus var. watsonianus
(Under Hesperochiron californicus)
Synonym (tjm2)
Hesperochiron campanulatus
(Under Hesperochiron pumilus)
Synonym (tjm2)
Hesperochiron ciliatus
(Under Hesperochiron pumilus)
Synonym (tjm2)
Hesperochiron latifolius
(Under Hesperochiron californicus)
Synonym (tjm2)
Hesperochiron nanus
(Under Hesperochiron californicus)
Synonym (tjm2)
Hesperochiron pumilusNative
Hesperochiron pumilus f. fulcratus
(Under Hesperochiron pumilus)
Synonym (tjm2)
Hesperochiron pumilus f. hirtellus
(Under Hesperochiron pumilus)
Synonym (tjm2)
Hesperochiron pumilus f. nervosus
(Under Hesperochiron pumilus)
Synonym (tjm2)
Hesperochiron pumilus f. villosulus
(Under Hesperochiron pumilus)
Synonym (tjm2)
Hesperochiron pumilus var. ciliatus
(Under Hesperochiron pumilus)
Synonym (tjm2)
Hesperochiron pumilus var. vestitus
(Under Hesperochiron pumilus)
Synonym (tjm2)
Hesperochloa kingii
(Under Festuca kingii)
Synonym (tjm2)
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 (tjm2)
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 (tjm2)
Hesperomecon linearisNative
Hesperoscordum aridum
(Under Triteleia hyacinthina)
Synonym (tjm2)
Hesperoscordum hyacinthinum
(Under Triteleia hyacinthina)
Synonym (tjm2)
Hesperoscordum lacteum
(Under Triteleia hyacinthina)
Synonym (tjm2)
Hesperoscordum lewisii
(Under Triteleia hyacinthina)
Synonym (tjm2)
Hesperoscordum lilacinum
(Under Triteleia lilacina)
Synonym (tjm2)
Hesperoscordum maritimum
(Under Muilla maritima)
Synonym (tjm2)
Hesperostipa comata
(Under Stipa comata)
Synonym (tjm2)
Hesperostipa comata subsp. comata
(Under Stipa comata var. comata)
Synonym (tjm2)
Hesperostipa comata subsp. intermedia
(Under Stipa comata var. intermedia)
Synonym (tjm2)
HesperoyuccaQUIXOTE PLANT, CHAPARRAL YUCCA
Hesperoyucca whippleiNative
Hesperoyucca whipplei var. graminifolia
(Under Hesperoyucca whipplei)
Synonym (tjm2)
Heteranthemis
Heteranthemis viscidehirta, orth. var.
(Under Heteranthemis viscidihirta)
Synonym (tjm2)
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 (tjm2)
Heterogaura heterandra
(Under Clarkia heterandra)
Synonym (tjm2)
HeteromelesCHRISTMAS BERRY, TOYON
Heteromeles arbutifoliaNative
Heteromeles arbutifolia var. arbutifolia
(Under Heteromeles arbutifolia)
Synonym (tjm2)
Heteromeles arbutifolia var. cerina
(Under Heteromeles arbutifolia)
Synonym (tjm2)
Heteromeles arbutifolia var. macrocarpa
(Under Heteromeles arbutifolia)
Synonym (tjm2)
Heteromeles salicifolia
(Under Heteromeles arbutifolia)
Synonym (tjm2)
Heteropogon
Heteropogon contortusTANGLEHEADNaturalized
Heterotheca
  ↳  Key to Heterotheca
GOLDENASTER, TELEGRAPH WEED
Heterotheca echioides var. bolanderi
(Under Heterotheca sessiliflora subsp. bolanderi)
Synonym (tjm2)
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 (tjm2)
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 (tjm2)
Heterotheca sessiliflora var. fastigiata
(Under Heterotheca sessiliflora subsp. fastigiata)
Synonym (tjm2)
Heterotheca sessiliflora var. sanjacintensis
(Under Heterotheca sessiliflora subsp. fastigiata)
Mentioned in
a note
Heterotheca sessiliflora var. sessiliflora
(Under Heterotheca sessiliflora subsp. sessiliflora)
Synonym (tjm2)
Heterotheca shevockiiSHEVOCK'S GOLDENASTERNative
Heterotheca subaxillaris subsp. latifoliaCAMPHOR-WEEDNative
Heterotheca villosaHAIRY GOLDENASTERNative
Heterotheca villosa var. hispida
(Under Heterotheca villosa var. minor)
Synonym (tjm2)
Heterotheca villosa var. minorNative
Heterotheca villosa var. scabraNative
Heterotheca villosa var. shevockii
(Under Heterotheca shevockii)
Synonym (tjm2)
Heterotheca villosa var. villosa
(Under Heterotheca villosa var. minor)
Synonym (tjm2)
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, orth. var.
(Under Heuchera caespitosa)
Synonym (tjm2)
Heuchera cylindricaNative
Heuchera cylindrica var. alpina
(Under Heuchera cylindrica)
Synonym (tjm2)
Heuchera duranii
(Under Heuchera parvifolia)
Synonym (tjm2)
Heuchera elegans
(Under Heuchera caespitosa)
Synonym (tjm2)
Heuchera hirsutissimaSHAGGY-HAIRED ALUMROOTNative
Heuchera maximaISLAND ALUMROOTNative
Heuchera merriamiiNative
Heuchera micranthaNative
Heuchera micrantha var. diversifolia
(Under Heuchera micrantha)
Synonym (tjm2)
Heuchera micrantha var. erubescens
(Under Heuchera micrantha)
Synonym (tjm2)
Heuchera micrantha var. hartwegii
(Under Heuchera micrantha)
Synonym (tjm2)
Heuchera micrantha var. macropetala
(Under Heuchera micrantha)
Synonym (tjm2)
Heuchera parishiiPARISH'S ALUMROOTNative
Heuchera parvifoliaNative
Heuchera pilosissimaNative
Heuchera rubescensNative
Heuchera rubescens var. abramsii
(Under Heuchera abramsii)
Synonym (tjm2)
Heuchera rubescens var. alpicola
(Under Heuchera rubescens)
Synonym (tjm2)
Heuchera rubescens var. glandulosa
(Under Heuchera rubescens)
Synonym (tjm2)
Heuchera rubescens var. parishii
(Under Heuchera parishii)
Synonym (tjm2)
Heuchera rubescens var. rydbergiana
(Under Heuchera rubescens)
Synonym (tjm2)
Heuchera rubescens var. versicolor
(Under Heuchera rubescens)
Synonym (tjm2)
Hibiscus
  ↳  Key to Hibiscus
HIBISCUS
Hibiscus californicus
(Under Hibiscus lasiocarpos var. occidentalis)
Synonym (tjm2)
Hibiscus denudatusPALE FACENative
Hibiscus denundatus var. involucellatus
(Under Hibiscus denudatus)
Synonym (tjm2)
Hibiscus lasiocarpos var. californicus
(Under Hibiscus lasiocarpos var. occidentalis)
Synonym (tjm2)
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 (tjm2)
Hibiscus moscheutos var. occidentalis
(Under Hibiscus lasiocarpos var. occidentalis)
Synonym (tjm2)
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 (tjm2)
Hieracium aurantiacumORANGE HAWKWEEDWaif
Hieracium bolanderiBOLANDER'S HAWKWEEDNative
Hieracium gracile
(Under Hieracium triste)
Synonym (tjm2)
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 (tjm2)
Hierochloe occidentalis
(Under Anthoxanthum occidentale)
Synonym (tjm2)
Hierochloe odorata
(Under Anthoxanthum nitens subsp. nitens)
Synonym (tjm2)
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 (tjm2)
Hoffmannseggia glaucaPIG-NUT, HOG POTATONative
Hoffmannseggia microphyllaNative
Hofmeisteria pluriseta
(Under Pleurocoronis pluriseta)
Synonym (tjm2)
Hoita
  ↳  Key to Hoita
LEATHER ROOT
Hoita hallii
(Under Rupertia hallii)
Synonym (tjm2)
Hoita macrostachyaNative
Hoita orbicularisNative
Hoita rigida
(Under Rupertia rigida)
Synonym (tjm2)
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 (tjm2)
Holocarpha
  ↳  Key to Holocarpha
TARWEED, TARPLANT
Holocarpha heermanniiNative
Holocarpha macradeniaSANTA CRUZ TARPLANTNative
Holocarpha obconicaNative
Holocarpha obconica subsp. autumnalis
(Under Holocarpha obconica)
Synonym (tjm2)
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 (tjm2)
Holodiscus microphyllus var. glabrescens
(Under Holodiscus discolor var. glabrescens)
Synonym (tjm2)
Holodiscus microphyllus var. microphyllus
(Under Holodiscus discolor var. microphyllus)
Synonym (tjm2)
Holodiscus saxicola
(Under Holodiscus discolor)
Synonym (tjm2)
HolosteumJAGGED CHICKWEED
Holosteum umbellatum subsp. umbellatumNaturalized
Holozonia
Holozonia filipesWHITECROWNNative
Homo sapiens
(Under Vinca)
Mentioned in
a note
Hookera bicolor
(Under Triteleia grandiflora)
Synonym (tjm2)
Hookera bridgesii
(Under Triteleia bridgesii)
Synonym (tjm2)
Hookera californica
(Under Brodiaea californica)
Synonym (tjm2)
Hookera congesta
(Under Dichelostemma congestum)
Synonym (tjm2)
Hookera crocea
(Under Triteleia crocea)
Synonym (tjm2)
Hookera douglasii
(Under Triteleia grandiflora)
Synonym (tjm2)
Hookera filifolia
(Under Brodiaea filifolia)
Synonym (tjm2)
Hookera gracilis
(Under Triteleia montana)
Synonym (tjm2)
Hookera grandiflora
(Under Triteleia grandiflora)
Synonym (tjm2)
Hookera howellii
(Under Triteleia grandiflora)
Synonym (tjm2)
Hookera hyacinthina
(Under Triteleia hyacinthina)
Synonym (tjm2)
Hookera hyacinthina var. lactea
(Under Triteleia hyacinthina)
Synonym (tjm2)
Hookera ixioides var. lugens
(Under Triteleia lugens)
Synonym (tjm2)
Hookera laxa
(Under Triteleia laxa)
Synonym (tjm2)
Hookera leptandra
(Under Brodiaea leptandra)
Synonym (tjm2)
Hookera macropoda
(Under Brodiaea terrestris subsp. terrestris)
Synonym (tjm2)
Hookera minor
(Under Brodiaea minor)
Synonym (tjm2)
Hookera multiflora
(Under Dichelostemma multiflorum)
Synonym (tjm2)
Hookera multipedunculata
(Under Brodiaea orcuttii)
Synonym (tjm2)
Hookera orcuttii
(Under Brodiaea orcuttii)
Synonym (tjm2)
Hookera parviflora
(Under Dichelostemma multiflorum)
Synonym (tjm2)
Hookera pauciflora
(Under Dichelostemma capitatum subsp. pauciflorum)
Synonym (tjm2)
Hookera peduncularis
(Under Triteleia peduncularis)
Synonym (tjm2)
Hookera purdyi
(Under Brodiaea minor)
Synonym (tjm2)
Hookera rosea
(Under Brodiaea rosea)
Synonym (tjm2)
Hookera stellaris
(Under Brodiaea stellaris)
Synonym (tjm2)
Hookera synandra
(Under Brodiaea leptandra)
Synonym (tjm2)
Hookera volubilis
(Under Dichelostemma volubile)
Synonym (tjm2)
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 (tjm2)
Hordeum depressumLOW BARLEY, ALKALI BARLEYNative
Hordeum geniculatum
(Under Hordeum marinum subsp. gussoneanum)
Synonym (tjm2)
Hordeum glaucum
(Under Hordeum murinum subsp. glaucum)
Synonym (tjm2)
Hordeum hystrix
(Under Hordeum marinum subsp. gussoneanum)
Synonym (tjm2)
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 (tjm2)
Hordeum leporinum
(Under Hordeum murinum subsp. leporinum)
Synonym (tjm2)
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)
Mentioned in
a note
Hordeum pusillum
(Under Hordeum intercedens)
Synonym (tjm2)
Hordeum stebbinsii
(Under Hordeum murinum subsp. glaucum)
Synonym (tjm2)
Hordeum vulgareBARLEYWaif
Hordeum vulgare var. trifurcatum
(Under Hordeum vulgare)
Synonym (tjm2)
Hordeum vulgare var. vulgare
(Under Hordeum vulgare)
Synonym (tjm2)
Horkelia
  ↳  Key to Horkelia
Horkelia bolanderiBOLANDER'S HORKELIANative
Horkelia bolanderi subsp. clevelandii
(Under Horkelia clevelandii var. clevelandii)
Synonym (tjm2)
Horkelia bolanderi subsp. parryi
(Under Horkelia rydbergii)
Synonym (tjm2)
Horkelia californicaNative
Horkelia californica subsp. californica
(Under Horkelia californica var. californica)
Synonym (tjm2)
Horkelia californica subsp. dissita
(Under Horkelia californica var. elata)
Synonym (tjm2)
Horkelia californica subsp. frondosa
(Under Horkelia californica var. frondosa)
Synonym (tjm2)
Horkelia californica var. californicaNative
Horkelia californica var. elataNative
Horkelia californica var. frondosaNative
Horkelia chaetophora
(Under Ivesia pygmaea)
Synonym (tjm2)
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 (tjm2)
Horkelia congesta var. nemorosaJOSEPHINE HORKELIANative
Horkelia cuneataNative
Horkelia cuneata subsp. cuneata
(Under Horkelia cuneata var. cuneata)
Synonym (tjm2)
Horkelia cuneata subsp. puberula
(Under Horkelia cuneata var. puberula)
Synonym (tjm2)
Horkelia cuneata subsp. sericea
(Under Horkelia cuneata var. sericea)
Synonym (tjm2)
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 (tjm2)
Horkelia daucifolia subsp. latior
(Under Horkelia daucifolia var. daucifolia)
Synonym (tjm2)
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 (tjm2)
Horkelia flavescens
(Under Horkelia tridentata var. flavescens)
Synonym (tjm2)
Horkelia frondosa
(Under Horkelia californica var. frondosa)
Synonym (tjm2)
Horkelia fuscaNative
Horkelia fusca subsp. capitata
(Under Horkelia fusca var. pseudocapitata)
Synonym (tjm2)
Horkelia fusca subsp. parviflora
(Under Horkelia fusca var. parviflora)
Synonym (tjm2)
Horkelia fusca subsp. pseudocapitata
(Under Horkelia fusca var. brownii)
Synonym (tjm2)
Horkelia fusca subsp. pseudocapitata
(Under Horkelia fusca var. pseudocapitata)
Synonym (tjm2)
Horkelia fusca subsp. tenella
(Under Horkelia fusca var. tenella)
Synonym (tjm2)
Horkelia fusca var. browniiNative
Horkelia fusca var. parvifloraNative
Horkelia fusca var. pseudocapitataNative
Horkelia fusca var. tenellaNative
Horkelia glandulosa
(Under Horkelia californica var. elata)
Synonym (tjm2)
Horkelia hendersoniiHENDERSON'S HORKELIANative
Horkelia hispidulaWHITE MOUNTAINS HORKELIANative
Horkelia howelliiHOWELL'S HORKELIANative
Horkelia marinensisPOINT REYES HORKELIANative
Horkelia mollis
(Under Ivesia campestris)
Synonym (tjm2)
Horkelia parryiPARRY'S HORKELIANative
Horkelia rydbergiiNative
Horkelia scandularis
(Under Ivesia lycopodioides var. scandularis)
Synonym (tjm2)
Horkelia sericataSILKY HORKELIANative
Horkelia tenuilobaTHIN-LOBED HORKELIANative
Horkelia tridentataNative
Horkelia tridentata subsp. flavescens
(Under Horkelia tridentata var. flavescens)
Synonym (tjm2)
Horkelia tridentata subsp. tridentata
(Under Horkelia tridentata var. tridentata)
Synonym (tjm2)
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 (tjm2)
Hosackia crassifoliaNative
Hosackia crassifolia var. crassifoliaNative
Hosackia crassifolia var. otayensisOTAY MOUNTAIN HOSACKIANative
Hosackia cuprea
(Under Hosackia oblongifolia var. cuprea)
Synonym (tjm2)
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 (tjm2)
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 (tjm2)
Humulus lupulus var. neomexicanus
(Under Humulus lupulus)
Synonym (tjm2)
Hunnemannia fumariifolia
(Under Papaveraceae)
Mentioned in
a note
Hutchinsia procumbens
(Under Hornungia procumbens)
Synonym (tjm2)
Hydastylus borealis
(Under Sisyrinchium californicum)
Synonym (tjm2)
Hydastylus brachypus
(Under Sisyrinchium californicum)
Synonym (tjm2)
Hydastylus longipes
(Under Sisyrinchium longipes)
Synonym (tjm2)
Hydrangeaceae
  ↳  Key to Hydrangeaceae
HYDRANGEA FAMILY
Hydrilla
Hydrilla verticillataNaturalized
Hydrocharis spongia
(Under Limnobium spongia)
Synonym (tjm2)
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 (tjm2)
Hydrolea urens
(Under Wigandia urens)
Synonym (tjm2)
Hydropeltis purpurea
(Under Brasenia schreberi)
Synonym
Hydrophyllum
  ↳  Key to Hydrophyllum
WATERLEAF
Hydrophyllum albifrons
(Under Hydrophyllum fendleri var. albifrons)
Synonym (tjm2)
Hydrophyllum albifrons subvar. pendulum
(Under Hydrophyllum fendleri var. albifrons)
Synonym (tjm2)
Hydrophyllum alpestreALPINE BREECHESNative
Hydrophyllum alpinum
(Under Hydrophyllum alpestre)
Mentioned in
a note
Hydrophyllum capitatum var. alpinum
(Under Hydrophyllum)
Mentioned in
a note
Hydrophyllum capitatum var. alpinum
(Under Hydrophyllum alpestre)
Synonym (tjm2)
Hydrophyllum congestum
(Under Hydrophyllum fendleri var. albifrons)
Synonym (tjm2)
Hydrophyllum fendleri var. albifronsWHITE WATERLEAFNative
Hydrophyllum lineare
(Under Phacelia linearis)
Synonym (tjm2)
Hydrophyllum occidentaleWESTERN WATERLEAFNative
Hydrophyllum tenuipesSLENDERFOOT WATERLEAF, PACIFIC WATERLEAFNative
Hydrophyllum viridulum var. viride
(Under Hydrophyllum tenuipes)
Synonym (tjm2)
Hymenoclea monogyra
(Under Ambrosia monogyra)
Synonym (tjm2)
Hymenoclea salsola var. fasciculata
(Under Ambrosia salsola var. salsola)
Synonym (tjm2)
Hymenoclea salsola var. patula
(Under Ambrosia salsola var. salsola)
Synonym (tjm2)
Hymenoclea salsola var. pentalepis
(Under Ambrosia salsola var. pentalepis)
Synonym (tjm2)
Hymenoclea salsola var. salsola
(Under Ambrosia salsola var. salsola)
Synonym (tjm2)
Hymenolobus procumbens
(Under Hornungia procumbens)
Synonym (tjm2)
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 (tjm2)
Hymenoxys acaulis var. nana
(Under Tetraneuris acaulis var. arizonica)
Synonym (tjm2)
Hymenoxys cooperiNative
Hymenoxys cooperi var. canescens
(Under Hymenoxys cooperi)
Synonym (tjm2)
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 (tjm2)
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 (tjm2)
Hypochaeris
  ↳  Key to Hypochaeris
CAT'S-EAR
Hypochaeris glabraSMOOTH CAT'S-EARNaturalized
Hypochaeris radicataROUGH CAT'S-EARNaturalized
Hypopitys fimbriata
(Under Monotropa hypopitys)
Synonym (tjm2)
Hypopitys lanuginosa
(Under Monotropa hypopitys)
Synonym (tjm2)
Hypopitys monotropa
(Under Monotropa hypopitys)
Synonym (tjm2)
Hyptis emoryi
(Under Condea emoryi)
Synonym (tjm2)
Hystrix californica
(Under Elymus californicus)
Synonym