Haageocereus acranthus (2)
Haageocereus australis var. acinacispinus (1)
Haageocereus versicolor var. aureispinus (2)
Habenaria (2)
Habenaria clypeata (5)
Habenaria falcicornis var. caffra (5)
Habenaria floribunda (9)
Habenaria lithophila (3)
Habenaria medusa (3)
Habenaria monorhiza (5)
Habenaria monorrhiza (5)
Habenaria nivea (1)
Habenaria nyikana (5)
Habenaria onorrhiza (1)
Habenaria orbiculata (1)
Habenaria repens (4)
Habenaria rhodocheila (2)
Habenaria saccata (1)
Habenaria viridis var. bracteata (7)
Habranthus andersonii (3)
Habranthus tubispathus (4)
Hackelia amethystina (7)
Hackelia bella (20)
Hackelia brevicula (18)
Hackelia californica (29)
Hackelia cronquistii (2)
Hackelia cusickii (10)
Hackelia diffusa var. arida (3)
Hackelia floribunda (44)
Hackelia micrantha (88)
Hackelia mundula (41)
Hackelia nervosa (39)
Hackelia patens (17)
Hackelia setosa (1)
Hackelia sharsmithii (8)
Hackelia sp. (6)
Hackelia ursina (7)
Hackelia velutina (82)
Hackelia venusta (2)
Hackelia virginiana (8)
Hacquetia epipactis (6)
Haemanthus albiflos (9)
Haemanthus coccineus (15)
Haemanthus humilis (3)
Haematopus moquini (1)
Haematoxylum brasiletto (36)
Hainardia cylindrica (19)
Hakea acicularis (6)
Hakea amplexicaulis (2)
Hakea archaeoides (2)
Hakea bucculenta (1)
Hakea eriantha (3)
Hakea incrassata (1)
Hakea laurina (1)
Hakea petiolaris (5)
Hakea salicifolia (5)
Hakea suaveolens (20)
Hakonechloa macra (3)
Hakonechloa macra var. albovariegata (1)
Halenia deflexa (14)
Halenia recurva (14)
Halenia umbellata (2)
Halesia carolina (8)
Halesia diptera (3)
Halesia monticola (6)
Halesia tetraptera (7)
Halichrysis concrescens (6)
Halimeda borneensis (30)
Halimeda borneensis cf (6)
Halimeda discoidea (8)
Halimeda discoidea complex (3)
Halimeda distorta f. hederacea (4)
Halimeda heteromorpha (6)
Halimeda minima (23)
Halimeda opuntia (5)
Halimeda taenicola (6)
Halimiocistus wintonensis (1)
Halimium atriplicifolium (1)
Halimium halimifolium ssp. halimifolium (1)
Halimium lasianthum (1)
Halimium ocymoides (1)
Halimium viscosum (3)
Halimium x pauanum (1)
Halimodendron halodendron (6)
Halimolobos jaegeri (28)
Halimolobos whitedii (3)
Halleria lucida (4)
Halogeton glomeratus (61)
Halophila decipiens (23)
Halophila sp. (6)
Haloplegma duperreyi (9)
Halosaccion glandiforme (10)
Halosaccion grandiforme (3)
Halymenia actinophysa (7)
Halymenia santamariae (1)
Hamameles virginiana (1)
Hamamelis intermedia (1)
Hamamelis mollis (1)
Hamamelis virginiana (19)
Hamamelis x intermedia (2)
Hamelia axillaris (3)
Hamelia patens var. patens (1)
Hammarbya paludosa (2)
Handoanthus impetiginosus (3)
Handroanthus chrysanthus (2)
Handroanthus chrysotrichus (14)
Handroanthus impetiginosus (8)
Haplocarpha scaposa (1)
Haploesthes greggii var. texana (21)
Haplopappus crocea (6)
Haplopappus foliosus (14)
Haplopappus macrocephalus (8)
Haplopappus parryi (4)
Haplopappus sp. (1)
Haplopappus stenophyllus (1)
Haplophyllum patavinum (1)
Haplopteris elongata (7)
Haplostachys haplostachya (7)
Hardenbergia violacea (13)
Harfordia macroptera (7)
Harmonia doris-nilesiae (28)
Harmonia guggolziorum (30)
Harmonia hallii (28)
Harmonia nutans (40)
Harmonia stebbinsii (17)
Harpagonella palmeri (41)
Harpanthus flotovianus (3)
Harpephyllum caffrum (19)
Harrisia pomanensis (4)
Harveya speciosa (1)
Hasteola suaveolens (2)
Hastingsia alba (71)
Hastingsia bracteosa var. atropurpurea (6)
Hastingsia bracteosa var. bracteosa (4)
Hastingsia serpenticola (4)
Hastingsia serpentinicola (35)
Hastingsia sp. (3)
Hatiora salicornioides (5)
Hauya heydeana (4)
Havardia pallens (5)
Hawortha emelyea var. major (1)
Haworthia angustifolia (1)
Haworthia arachnoidea (1)
Haworthia asperula (1)
Haworthia attenuata (2)
Haworthia badia (1)
Haworthia bayeri (1)
Haworthia bolusii (2)
Haworthia bolusii var. blackbeardeana (1)
Haworthia bolusii var. blackbeardiana (2)
Haworthia coarctata (2)
Haworthia comptoniana (2)
Haworthia cooperi (4)
Haworthia cooperi var. cooperi (1)
Haworthia cooperi var. dielsiana (1)
Haworthia cooperi var. leightonii (1)
Haworthia cooperi var. pilifera (2)
Haworthia cooperi var. truncata (2)
Haworthia cuspidata (1)
Haworthia cymbiformis var. cymbiformis (1)
Haworthia cymbiformis var. incurvula (1)
Haworthia cymbiformis var. setulifera (1)
Haworthia decipiens var. virella (2)
Haworthia emelyae (4)
Haworthia emelyae var. major (1)
Haworthia fasciata (1)
Haworthia glauca var. herrei (1)
Haworthia greenii (1)
Haworthia kegani (1)
Haworthia keganii (1)
Haworthia koelmaniorum (2)
Haworthia limifolia (2)
Haworthia magnifica var. acuminata (1)
Haworthia maughanii (4)
Haworthia pygmaea x haworthia truncata (1)
Haworthia radula (2)
Haworthia reinwardtii (9)
Haworthia reticulata var. hurlingii (1)
Haworthia reticulata var. subregularis (1)
Haworthia retusa (5)
Haworthia rossouwii (1)
Haworthia sp. (22)
Haworthia springbokvlakensis (3)
Haworthia truncata (1)
Haworthia turgida (1)
Haworthia turgida var. longibracteata (1)
Haworthia turgida var. suberecta (1)
Haworthia venosa (3)
Haworthia venosa ssp. tesselata (1)
Haworthia venosa var. tesselata (1)
Haworthia venusta (1)
Haworthia wimii (1)
Hazardia cana (6)
Hazardia detonsa (39)
Hazardia ferrisiae (1)
Hazardia orcuttii (21)
Hazardia squarrosa (36)
Hazardia squarrosa var. grindelioides (10)
Hazardia squarrosa var. squarrosa (14)
Hazardia stenolepis (6)
Hazardia whitneyi (2)
Hazardia whitneyi var. discoidea (10)
Hazardia whitneyi var. whitneyi (25)
Hebe andersonii (1)
Hebe epacridea (1)
Hebe hybrid (6)
Hebe macrocarpa var. brevifolia (1)
Hebe pareora (1)
Hebe sp. (6)
Hebe speciosa (1)
Hebe x franciscana (1)
Hebe xfranciscana (1)
Hebecarpa barbeyana (31)
Hebecarpa macradenia var. macradenia (9)
Hebecarpa obscura (14)
Hebecarpa obscura var. puberula (4)
Hebenstretia comosa (1)
Hebenstretia dentata (2)
Hecastocleis shockleyi (27)
Hechita texensis (1)
Hechtia glomerata (2)
Hechtia marnier-lepostollei (1)
Hechtia montana (3)
Hechtia texensis (14)
Hedeoma acinoides (1)
Hedeoma drummondii (25)
Hedeoma hispida (3)
Hedeoma hyssopifolia (16)
Hedeoma martirensis (4)
Hedeoma nana (11)
Hedeoma nana ssp. californica (33)
Hedeoma oblongifolia (19)
Hedeoma todsenii (1)
Hedera canariensis (31)
Hedera helix (48)
Hedera maderensis (2)
Hedera sp. (17)
Hedosyne ambrosiifolia (14)
Hedwigia ciliata (3)
Hedwigia detonsa (8)
Hedwigia stellata (4)
Hedychium coccineum (2)
Hedychium coronarium (6)
Hedychium densiflorum (1)
Hedychium flavescens (3)
Hedychium gardnerianum (13)
Hedychium grandiflorum (3)
Hedychium spicatum (3)
Hedychium villosum var. tenuiflorum (3)
Hedychium yunnanense (2)
Hedyotis procumbens (1)
Hedyotis salzmannii (1)
Hedyotis sp. (1)
Hedypnois cretica (57)
Hedypnois rhagadioloides (32)
Hedysarum alpinum (1)
Hedysarum boreale (26)
Hedysarum boreale var. boreale (7)
Hedysarum coronarium (10)
Hedysarum flavescens (2)
Hedysarum hedysaroides (1)
Hedysarum hedysaroides ssp. exaltatum (8)
Hedysarum mackensii (1)
Hedysarum occidentale (1)
Hedysarum sp. (1)
Hedysarum sulphurescens (3)
Heimia salicifolia (14)
Heleniuim autumnale (2)
Helenium amarum (2)
Helenium amarum var. amarum (6)
Helenium amarum var. badium (6)
Helenium aromaticum (10)
Helenium autumnale (62)
Helenium autumnale var. grandiflorum (1)
Helenium autumnale var. montanum (1)
Helenium bigelovii (160)
Helenium bolanderi (16)
Helenium flexuosum (14)
Helenium laciniatum (5)
Helenium linifolium (4)
Helenium microcephalum (1)
Helenium microcephalum var. microcephalum (4)
Helenium pinnatifidum (2)
Helenium puberulum (108)
Helenium sp. (2)
Heliamphora elongata (1)
Heliamphora folliculata (3)
Heliamphora heterodoxa (1)
Heliamphora ionasi (2)
Heliamphora minor (3)
Heliamphora nutans (5)
Heliamphora sp. (2)
Heliamphora tatei (4)
Helianthella californica (52)
Helianthella californica ssp. californica (2)
Helianthella californica var. (1)
Helianthella californica var. californica (28)
Helianthella californica var. nevadensis (71)
Helianthella californica var. shastensis (19)
Helianthella castanea (52)
Helianthella parryi (4)
Helianthella quinquenervis (5)
Helianthella uniflora (17)
Helianthella uniflora var. douglasii (6)
Helianthella uniflora var. uniflora (6)
Helianthemum apenninum (5)
Helianthemum bicknellii (8)
Helianthemum chihuahuensis (3)
Helianthemum grandiflorum (4)
Helianthemum nummularium (7)
Helianthemum nummularium ssp. grandiflorum (1)
Helianthemum oelandicum ssp. alpestre (3)
Helianthemum salicifolium (6)
Helianthemum scoparium (25)
Helianthus angustifolius (9)
Helianthus annuus (167)
Helianthus anomala (2)
Helianthus argophyllus (10)
Helianthus atrorubens (4)
Helianthus bolanderi (85)
Helianthus californcus (2)
Helianthus californicus (58)
Helianthus ciliaris (16)
Helianthus cusickii (17)
Helianthus debilis (3)
Helianthus debilis ssp. cucumberifolius (7)
Helianthus debilis ssp. debilis (3)
Helianthus debilis ssp. sylvestris (2)
Helianthus decapetalus (9)
Helianthus deserticola (19)
Helianthus divaricatus (16)
Helianthus exilis (33)
Helianthus giganteus (24)
Helianthus gracilentus (72)
Helianthus heterophylla (1)
Helianthus heterophyllus (5)
Helianthus hirsutus (25)
Helianthus inexpectatus (9)
Helianthus laciniatus (13)
Helianthus laetiflorus (3)
Helianthus maximiliani (16)
Helianthus maximilianii (3)
Helianthus microcephalus (3)
Helianthus mollis (5)
Helianthus niveus (1)
Helianthus niveus ssp. canescens (1)
Helianthus niveus ssp. tephrodes (67)
Helianthus nuttallii (10)
Helianthus nuttallii ssp. nuttallii (33)
Helianthus nuttallii ssp. rydbergii (3)
Helianthus paradoxus (3)
Helianthus pauciflorus ssp. subrhomboideus (21)
Helianthus petiolaris (14)
Helianthus petiolaris ssp. canescens (24)
Helianthus petiolaris ssp. petiolaris (11)
Helianthus pumilus (8)
Helianthus radula (7)
Helianthus salicifolius (2)
Helianthus sp. (5)
Helianthus tuberosus (49)
Helianthus winteri (54)
Helichrysum amorginum (5)
Helichrysum amoriginum (1)
Helichrysum argentissimum (4)
Helichrysum argyrophyllum (9)
Helichrysum auriceps (2)
Helichrysum bracteatum (36)
Helichrysum confertifolium (2)
Helichrysum dasyanthum (1)
Helichrysum foetidum (15)
Helichrysum herbaceum (1)
Helichrysum italicum (15)
Helichrysum melaleucum (2)
Helichrysum petiolare (18)
Helichrysum retortoides (5)
Helichrysum retortum (13)
Helichrysum rutidolepis (3)
Helichrysum sp. (6)
Helichrysum splendidum (3)
Helichrysum subulifolium (2)
Helichrysum sutherlandii (1)
Helichrysum tianschanicum (2)
Helichrysum x amorginum (2)
Helicodiceros muscivorus (7)
Heliconia 'Dwarf Jamaican' (1)
Heliconia aemygdiana ssp. transandina (2)
Heliconia bihai (2)
Heliconia bihai var. jacquinii (1)
Heliconia caribaea (9)
Heliconia collinsiana (1)
Heliconia densiflora (2)
Heliconia latispatha (2)
Heliconia lingulata (1)
Heliconia longa (3)
Heliconia mariae (2)
Heliconia nigripraefixa (1)
Heliconia psittacorum (4)
Heliconia rostrata (6)
Heliconia spathocircinata (2)
Heliconia standleyi (1)
Heliconia stricta (3)
Heliconia tortuosa (3)
Heliconia vellerigera (1)
Heliiotropium anomalum (2)
Heliiotropium foertherianum (2)
Heliocarpus attenuatus (7)
Heliocarpus palmeri (3)
Heliomeris longifolia (14)
Heliomeris longifolia var. annua (5)
Heliomeris multiflora (24)
Heliomeris multiflora var. multiflora (13)
Heliomeris multiflora var. nevadensis (56)
Heliophila coronopifolia (2)
Heliophila longifolia (3)
Heliopsis annua (9)
Heliopsis helianthoides (22)
Heliopsis helianthoides var. scabra (26)
Heliopsis parvifolia (43)
Heliotropium amplexicaule (16)
Heliotropium angiospermum (3)
Heliotropium anomalum (11)
Heliotropium arborescens (5)
Heliotropium confertifolium (14)
Heliotropium convolvulaceum (5)
Heliotropium convolvulaceum var. californicum (12)
Heliotropium curassavicum (90)
Heliotropium curassavicum var. curassavicum (7)
Heliotropium curassavicum var. oculatum (69)

Heliotropium europaeum (10)
Heliotropium foertherianum (22)
Heliotropium greggii (10)
Heliotropium linariifolium (2)
Heliotropium peruvianum (3)
Heliotropium polyphyllum (2)
Heliotropium sp. (2)
Heliotropium steudneri (1)
Heliotropium tenellum (4)
Helipterum roseum (5)
Helleborus argutifolius (8)
Helleborus dumetorum (6)
Helleborus foetidus (13)
Helleborus helleborine (1)
Helleborus hybridus (2)
Helleborus multifidus ssp. istriacus (6)
Helleborus niger (63)
Helleborus odorus (10)
Helleborus orientalis (18)
Helleborus sp. (4)
Helleborus x hybridus (1)
Helmholtzia glaberrima (1)
Helminthotheca echioides (129)
Helodium blandowii (10)
Heloniopsis acutifolia (6)
Helwingia chinensis (1)
Hemerocallis (5)
Hemerocallis fulva (19)
Hemerocallis lilioasphodelus (14)
Hemerocallis middendorfii (37)
Hemerocallis sp. (41)
Hemiandra pungens (5)
Hemieva ranunculifolia (7)
Hemigenia macrantha (1)
Hemigraphis alternata (1)
Hemigraphis reptans (1)
Hemionitis arifolia (2)
Hemionitis limitanea (3)
Hemipteris werneri (1)
Hemitomes congestum (34)
Hemizonella minima (76)
Hemizonia congesta (17)
Hemizonia congesta ssp. calyculata (11)
Hemizonia congesta ssp. clevelandii (44)
Hemizonia congesta ssp. congesta (18)
Hemizonia congesta ssp. lutescens (52)
Hemizonia congesta ssp. luzulifolia (86)
Hemizonia congesta ssp. tracyi (9)
Hemizonia congesta var. luzulifolia (1)
Hemizonia corymbosa (1)
Hemizonia luzulaefolia (3)
Hemizonia luzulafolia (5)
Hemizonia mohavensis (1)
Hemizonia pungens (2)
Hemizonia pungens ssp. pungens (1)
Hemizygia transvaalensis (5)
Hennediella stanfordensis (4)
Henrya insularis (10)
Hepatica acutiloba (6)
Hepatica americana (3)
Hepatica nobilis (27)
Hepatica nobilis var. acuta (17)
Hepatica nobilis var. obtusa (2)
Heptacodium miconioides (11)
Heptacodium miconiooides (2)
Heptapleurum arboricola (1)
Heracleum austriacum ssp. siifolium (3)
Heracleum lanatum (14)
Heracleum mantegazzianum (3)
Heracleum maximum (200)
Heracleum sphondylium (13)
Heracleum sphondylium ssp. montanum (22)
Heracleum spondylium ssp. montanum (1)
Herbertus aduncus (7)
Hereroa sp. (1)
Hereroa wilmaniae (2)
Hereromeles arbutifolia (1)
Herissantia crispa (23)
Hermannia palmeri (21)
Hermannia texana (9)
Hermannia verticillata (2)
Herminium monorchis (19)
Hermodactylus tuberosus (7)
Hernandia moerenhoutiana campanulata (3)
Hernandia nymphaeifolia (5)
Hernandia ovigera (1)
Herniaria glabra (8)
Herniaria hirsuta (17)
Herniaria hirsuta ssp. cinerea (6)
Herniaria hirsuta var. cinerea (7)
Herniaria hirsuta var. hirsuta (11)
Herniaria incana (1)
Herposiphonia tenella (1)
Herrania balaensis (1)
Herrickia glauca (16)
Herrickia glauca var. glauca (3)
Herrickia horrida (2)
Herrisantia crispa (5)
Hesperalbizia occidentalis (19)
Hesperaloe funifera (10)
Hesperaloe parviflora (9)
Hesperantha baurii (1)
Hesperantha coccinea (8)
Hesperantha vaginata (2)
Hesperevax acaulis (8)
Hesperevax acaulis var. acaulis (20)
Hesperevax acaulis var. ambusticola (11)
Hesperevax acaulis var. robustior (1)
Hesperevax caulescens (48)
Hesperevax sparsiflora (1)
Hesperevax sparsiflora var. brevifolia (33)
Hesperevax sparsiflora var. sparsiflora (68)
Hesperidanthus jaegeri (9)
Hesperidanthus linearifolius (1)
Hesperis matronalis (25)
Hesperocallis undulata (284)
Hesperochiron californicus (69)
Hesperochiron nanus (5)
Hesperochiron pumilus (78)
Hesperochiron sp. (1)
Hesperocnide tenella (34)
Hesperocyparis abramsiana (14)
Hesperocyparis abramsiana var. abramsiana (12)
Hesperocyparis abramsiana var. abramsisana (1)
Hesperocyparis abramsiana var. butanoensis (14)
Hesperocyparis bakeri (56)
Hesperocyparis forbesii (43)
Hesperocyparis goveniana (22)
Hesperocyparis macnabiana (64)
Hesperocyparis macrocarpa (81)
Hesperocyparis montana (3)
Hesperocyparis nevadensis (31)
Hesperocyparis pigmaea (4)
Hesperocyparis pygmaea (44)
Hesperocyparis revealiana (5)
Hesperocyparis sargentii (59)
Hesperocyparis stephensonii (8)
Hesperolinon adenophyllum (21)
Hesperolinon bicarpellatum (31)
Hesperolinon breweri (22)
Hesperolinon californicum (24)
Hesperolinon clevelandii (9)
Hesperolinon congestum (69)
Hesperolinon didymocarpum (12)
Hesperolinon disjunctum (44)
Hesperolinon drymarioides (11)
Hesperolinon micranthum (27)
Hesperolinon serpentinum (8)
Hesperolinon sharsmithiae (4)
Hesperolinon spergulinum (13)
Hesperolinon tehamense (13)
Hesperomecon linearis (44)
Hesperostipa comata (10)
Hesperostipa comata ssp. comata (7)
Hesperostipa neomexicana (2)
Hesperostipa spartea (12)
Hesperoyucca peninsularis (2)
Hesperoyucca whipplei (271)
Hesperoyucca whipplei var. eremica (2)
Hesperoyucca whipplei var. newberryi (2)
Heteomeles arbutifolia (1)
Heteranthemis viscidihirta (14)
Heteranthera dubia (24)
Heteranthera limosa (5)
Heteranthera rotundifolia (10)
Heterocentrom subtriplinervium (2)
Heterocentron muricatum (1)
Heterocladium macounii (4)
Heterocodon rariflorum (59)
Heteromeles arbutifolia (228)
Heteromeles arbutifolia var. arbutifolia (1)
Heteromorpha arborescens (5)
Heteropappus crenatifolius (3)
Heteropappus hispidus (3)
Heteropappus meyendorfii (2)
Heteropgon melanocarpus (2)
Heteropixis natalensis (2)
Heteropogon contortus (25)
Heteropogon melanocarpus (1)
Heteropyxis canescens (7)
Heteropyxis natalensis (34)
Heterosiphonia crispella (15)
Heterosiphonia crispella f. laxa (10)
Heterosperma pinnatum (11)
Heterosperma xanti (5)
Heterospermum pinnatum (1)
Heterothalamus alienus (1)
Heterotheca camporum (3)
Heterotheca fulcrata (12)
Heterotheca fulcrata var. amplifolia (2)
Heterotheca grandiflora (197)
Heterotheca jonesii (11)
Heterotheca monarchensis (5)
Heterotheca mucronata (6)
Heterotheca oregona (13)
Heterotheca oregona ssp. oregona (1)
Heterotheca oregona var. compacta (6)
Heterotheca oregona var. oregona (21)
Heterotheca oregona var. rudis (11)
Heterotheca oregona var. scaberrima (22)
Heterotheca sessiliflora (16)
Heterotheca sessiliflora ssp. bolanderi (106)
Heterotheca sessiliflora ssp. echioides (26)
Heterotheca sessiliflora ssp. fastigiata (3)
Heterotheca sessiliflora ssp. sessiliflora (26)
Heterotheca sessiliflora ssp. sessiliflora & Nemacaulis denudata var. denudata (1)
Heterotheca shevockii (8)
Heterotheca subaxillaris (29)
Heterotheca subaxillaris ssp. latifolia (2)
Heterotheca subaxillaris ssp. subaxillaris (14)
Heterotheca villosa (63)
Heterotheca villosa var. ballardii (9)
Heterotheca villosa var. foliosa (3)
Heterotheca villosa var. minor (33)
Heterotheca villosa var. nana (1)
Heterotheca villosa var. pedunculata (13)
Heterotheca villosa var. villosa (4)
Heterotheca viscida (10)
Heterotis rotundifolia (1)
Heuchera abramsii (1)
Heuchera amoena (1)
Heuchera bracteata (4)
Heuchera brevistaminea (7)
Heuchera caespitosa (38)
Heuchera chlorantha (4)
Heuchera cylindrica (26)
Heuchera cylindrica var. alpina (3)
Heuchera cylindrica var. glabella (5)
Heuchera elegans (3)
Heuchera glabra (3)
Heuchera grossulariifolia (6)
Heuchera hallii (6)
Heuchera hirsutissima (22)
Heuchera hybrid (4)
Heuchera maericana (1)
Heuchera maxima (27)
Heuchera merriamii (26)
Heuchera micrantha (73)
Heuchera micrantha ssp. erubescens (1)
Heuchera micrantha var. diversifolia (1)
Heuchera parishii (29)
Heuchera parvifolia (40)
Heuchera parvifolia var. utahensis (2)
Heuchera pilosissima (19)
Heuchera richardsonii (15)
Heuchera rubescens (81)
Heuchera rubescens var. versicolor (2)
Heuchera sanguinea (9)
Heuchera sp. (42)
Heuchera villosa (2)
Heuchera X (3)
Heuchera x micrantha (2)
Heucherella sp. (2)
Hexalectris grandiflora (2)
Hexalobus monopetalus (17)
Hexastylis heterophylla (2)
Hibbertia aspera (3)
Hibbertia cuneiformis (2)
Hibbertia grossulariifolia (2)
Hibbertia hypericoides (2)
Hibbertia scandens (4)
Hibiscadelphus distans (7)
Hibiscadelphus giffardianus (17)
Hibiscadelphus hualalaiensis (12)
Hibiscus acetosella (2)
Hibiscus aethiopicus (5)
Hibiscus aponeurus (2)
Hibiscus arnottianus (5)
Hibiscus arnottianus ssp. immaculatus (3)
Hibiscus austrinus (2)
Hibiscus brackenridgei (4)
Hibiscus brackenridgei ssp. brackenridgei (13)
Hibiscus caesius (2)
Hibiscus calyphyllus (2)
Hibiscus cannabinus (4)
Hibiscus cisplatinus (8)
Hibiscus clayi (5)
Hibiscus coccineus (4)
Hibiscus coulteri (23)
Hibiscus denudatus (97)
Hibiscus elatus (4)
Hibiscus engleri (3)
Hibiscus flavifolius (1)
Hibiscus kokio ssp. kokio (4)
Hibiscus kokio ssp. saintjohnianus (6)
Hibiscus lasiocarpos (19)
Hibiscus lasiocarpos var. occidentalis (35)
Hibiscus militaris (1)
Hibiscus moscheutos (16)
Hibiscus moscheutos ssp. palustris (3)
Hibiscus mutabilis (6)
Hibiscus pedunculatus (3)
Hibiscus pycnostemon (1)
Hibiscus ribifolius (3)
Hibiscus rosa-sinensis (78)
Hibiscus rosa-sinensis cv. Sylvia Goodman (1)
Hibiscus rosa-sinensis var. (4)
Hibiscus sabdariffa (7)
Hibiscus schizopetalus (5)
Hibiscus sp (2)
Hibiscus sp. (11)
Hibiscus splendens (10)
Hibiscus syriacus (30)
Hibiscus taiwanensis (4)
Hibiscus tiliaceus (28)
Hibiscus tiliaceus subsp. tiliaceus 'Purau Ute' (1)
Hibiscus trionum (19)
Hibiscus waimeae (2)
Hibiscus waimeae ssp. hannerae (6)
Hibiscus waimeae ssp. waimeae (4)
Hibiscus x archeri (4)
Hieracium albiflorum (158)
Hieracium antarcticum (2)
Hieracium argutum (31)
Hieracium aurantiacum (25)
Hieracium bolanderi (11)
Hieracium caespitosum (8)
Hieracium cynoglossoides (2)
Hieracium dollineri (6)
Hieracium fendleri (3)
Hieracium gracile (6)
Hieracium grandidens (2)
Hieracium greenei (13)
Hieracium horridum (110)
Hieracium lachenalii (3)
Hieracium longipilum (11)
Hieracium medium (1)
Hieracium megacephalum (3)
Hieracium murorum (5)
Hieracium nudicaule (2)
Hieracium paniculatum (3)
Hieracium pannosum (5)
Hieracium parryi (15)
Hieracium pilosella (17)
Hieracium piloselloides (3)
Hieracium pilosum (2)
Hieracium pringlei (1)
Hieracium robinsonii (5)
Hieracium scabrum (8)
Hieracium scabrum var. scabrum (3)
Hieracium scouleri (31)
Hieracium sp. (1)
Hieracium triste (27)
Hieracium umbellatum (33)
Hieracium vagum (3)
Hieracium villosum (3)
Hieracium vulgatum (3)
Hierochloe occidentalis (6)
Hierochloe odorata (7)
Hilaria jamesii (26)
Hilaria mutica (10)
Hilaria rigida (68)
Hildenbrandia galapagensis (1)
Hildewintera colademononis (3)
Hildewintera colademononsis (1)
Hillebrandia sandwicensis (2)
Hillia parasitica (1)
Himantoglossum adriaticum (11)
Himantoglossum hircinum (29)
Hintonia latiflora (7)
Hippeastrum equestre (1)
Hippeastrum sp. (8)
Hippeastrum stylosum (6)
Hippeastrum vittatum (1)
Hippobroma longiflora (10)
Hippocrepis comosa (19)
Hippocrepis unisiliquosa (5)
Hippophae rhamnoides (10)
Hippuris montana (1)
Hippuris vulgaris (39)
Hiraea grandifolia (1)
Hiraea purpusii (2)
Hirpicium armerioides (4)
Hirschfeldia incana (86)
Hirtella ciliata (10)
Hirtella santosii (9)
Histiopteris incisa (16)
Histrionicus histrionicus (1)
Hladnikia pastinacifolia (9)
Hlianthus exilis (1)
Hlox multiflora (1)
Hoffmannia ghiesbreghtii (4)
Hoffmannseggia drepanocarpa (17)
Hoffmannseggia glauca (81)
Hoffmannseggia microphylla (74)
Hoffmannseggia peninsularis (2)
Hoffmannseggia sp. (1)
Hoffmannseggia trifoliata (1)
Hoffmanseggia microphylla (4)
Hoffmansegia microphylla (5)
Hoffmeisteria fasciculata (19)
Hofmeisteria crassifolia (14)
Hofmeisteria fasciculata (7)
Hohenbergia blanchetii (33)
Hoheria glabrata (2)
Hoheria sexstylosa (15)
Hoita macrostachya (49)
Hoita macrostachys (4)
Hoita orbicularis (32)
Hoita strobilina (54)
Holarrhena pubescens (2)
Holcoglossum flavescens (1)
Holcus lanatus (68)
Holcus mollis (6)
Hollisteria lanata (25)
Holmgrenanthe petrophila (16)
Holmskioldia sanguinea (5)
Holmskioldia sanguinea f. citrina (1)
Holocarpha heermannii (72)
Holocarpha macradenia (38)
Holocarpha obconica (32)
Holocarpha virgata (25)
Holocarpha virgata ssp. elongata (7)
Holocarpha virgata ssp. virgata (64)
Holodiscus boissieri (1)
Holodiscus discolor (98)
Holodiscus discolor var. cedrorum (1)
Holodiscus discolor var. discolor (42)
Holodiscus discolor var. dumosus (2)
Holodiscus discolor var. glabrescens (15)
Holodiscus discolor var. microphyllus (55)
Holodiscus dumosa (1)
Holodiscus dumosus (25)
Holodiscus dumosus var. cedorus (4)
Holodiscus dumosus var. cedrorum (2)
Holodiscus glabrescens (1)
Holodiscus microphyllus var. glabrescens (11)
Holodiscus microphyllus var. microphyllus (18)

Holographis virgata ssp. glandulifera (3)
Holopyxidium sp. nov. (14)
Holosteum umbellatum (7)
Holothrix orthoceras (2)
Holozonia filipes (23)
Homalanthus populneus (6)
Homalium dantatum (1)
Homalocarpus dichotomus (3)
Homalocladium platycladum (3)
Homalomena picturata (1)
Homalothecium arenarium (5)
Homalothecium californicum (5)
Homalothecium nevadense (6)
Homalothecium nuttallii (4)
Homalothecium pinnatifidum (10)
Homalothecium pinnatifidum? (1)
Homalothecium sp. (8)
Homeria collina (1)
Homeria elegans (1)
Homeria sp. (2)
Homogyne alpina (4)
Homogyne sylvestris (7)
Honckenya peploides (11)
Honckenya peploides ssp. diffusa (2)
Honckenya peploides ssp. major (5)
Hoodia gordonii (6)
Hoodia juttae (2)
Hoodia parviflora (2)
Hoodia ruschii (3)
Hookeria lucens (4)
Hooveria parviflora (1)
Hooveria purpureum (1)
Hooveria purpureum var. purpureum (5)
Hooveria purpureum var. reductum (20)
Hordeum arizonicum (7)
Hordeum brachyantherum (27)
Hordeum brachyantherum ssp. brachyantherum (9)
Hordeum brachyantherum ssp. californicum (8)
Hordeum depressum (11)
Hordeum intercedens (14)
Hordeum jubatum (18)
Hordeum jubatum ssp. jubatum (30)
Hordeum marinum (4)
Hordeum marinum ssp. gussoneanum (16)
Hordeum murinum (30)
Hordeum murinum ssp. glaucum (25)
Hordeum murinum ssp. leporinum (20)
Hordeum sp. (2)
Hordeum vulgare (10)
Hordfordia alata (7)
Horkelia bolanderi (20)
Horkelia california (2)
Horkelia californica (14)
Horkelia californica var. californica (26)
Horkelia californica var. elata (13)
Horkelia californica var. frondosa (11)
Horkelia clevelandii (4)
Horkelia clevelandii var. clevelandii (30)
Horkelia congesta (2)
Horkelia congesta ssp. nemorosa (7)
Horkelia congesta var. nemorosa (2)
Horkelia cuneata (15)
Horkelia cuneata var. cuneata (36)
Horkelia cuneata var. puberula (27)
Horkelia cuneata var. sericea (9)
Horkelia daucifolia (20)
Horkelia daucifolia var. caruifolia (3)
Horkelia daucifolia var. daucifolia (16)
Horkelia daucifolia var. indicta (15)
Horkelia fusca (24)
Horkelia fusca var. brownii (9)
Horkelia fusca var. parviflora (37)
Horkelia fusca var. pseudocapitata (5)
Horkelia fusca var. tenella (5)
Horkelia hendersonii (23)
Horkelia hispidula (25)
Horkelia howellii (6)
Horkelia marinensis (65)
Horkelia parryi (36)
Horkelia rydbergii (19)
Horkelia sericata (16)
Horkelia sp. (2)
Horkelia tenuiloba (14)
Horkelia tridentata (36)
Horkelia tridentata ssp. tridentata (10)
Horkelia tridentata var. flavescens (10)
Horkelia tridentata var. tridentata (46)
Horkelia truncata (35)
Horkelia tularensis (3)
Horkelia wilderae (13)
Horkelia yadonii (10)
Horkeliella congdonis (14)
Horkeliella purpurascens (23)
Hormidium prismatocarpum (1)
Horminum pyrenaicum (5)
Hormosira banksii (3)
Hornungia procumbens (22)
Horsfordia alata (25)
Horsfordia newberryi (57)
Hosackia crassifolia (35)
Hosackia crassifolia var. crassifoia (1)
Hosackia crassifolia var. crassifolia (99)
Hosackia crassifolia var. otayensis (46)
Hosackia gracilis (94)
Hosackia incana (14)
Hosackia oblongifolia (33)
Hosackia oblongifolia var. cuprea (30)
Hosackia oblongifolia var. oblongifolia (86)
Hosackia pinnata (52)
Hosackia rosea (24)
Hosackia stipularis (4)
Hosackia stipularis var. ottleyi (10)
Hosackia stipularis var. stipularis (23)
Hosackia yollabolliensis (15)
Hosta kikutii var. caput-avis (1)
Hosta seiboldiana (1)
Hosta sieboldiana (1)
Hosta sp. (8)
Hosta tokudama (1)
Hosta undulata (1)
Hosta ventricosa (2)
Hottonia palustris (3)
Houlletia wallisii (2)
Houstonia acerosa var. acerosa (8)
Houstonia caerulea (12)
Houstonia humifusa (5)
Houstonia longifolia (11)
Houstonia purpurea var. purpurea (14)
Houstonia rubra (14)
Houstonia serpyllifolia (6)
Houstonia wrightii (1)
Houttuynia cordata (10)
Hovea elliptica (6)
Hovea trisperma var. grandiflora (1)
Hovenia dulcis (4)
Hovenia tomentella (2)
Howea belmoreana (2)
Howea forsteriana (1)
Howellanthus dalesianus (44)
Howellia aquatilis (13)
Howittia triocularis (2)
Hoya australis (2)
Hoya curtisii (2)
Hoya imbricata (2)
Hoya macrophylla (1)
Hoya sp. (1)
Hoya wibergiae (1)
Hudsonia ericoides (2)
Hudsonia tomentosa (2)
Huechera rubescens (4)
Huernia confusa (1)
Huernia keniensis (2)
Huernia kennedyana (1)
Huernia pillansii (1)
Huernia schneideriana (2)
Huernia thuretii (3)
Huernia transvaalensis (1)
Hugueninia tanacetifolia (2)
Hulsea algida (79)
Hulsea brevifolia (44)
Hulsea californica (60)
Hulsea heterochroma (90)
Hulsea mexicana (2)
Hulsea nana (98)
Hulsea vestita (8)
Hulsea vestita ssp. callicarpha (59)
Hulsea vestita ssp. gabrielensis (35)
Hulsea vestita ssp. inyoensis (8)
Hulsea vestita ssp. parryi (35)
Hulsea vestita ssp. pygmaea (9)
Hulsea vestita ssp. vestita (44)
Hulsea vestita var. vestita (1)
Humata anderssonii (8)
Humata pectinata (14)
Humata werneri (1)
Humulus lupulus (36)
Humulus sp. (1)
Hunnemannia fumarifolia (2)
Hunnemannia fumariifolia (18)
Huperzia appalachiana (3)
Huperzia brassii (1)
Huperzia copelandiana (1)
Huperzia copelandii (1)
Huperzia foliosa (1)
Huperzia lucidula (17)
Huperzia parksii (1)
Huperzia phlegmaria (6)
Huperzia reflexa (1)
Huperzia ribourtii (16)
Huperzia selago (9)
Huperzia squarrosa (17)
Huperzia taxifolia (1)
Huperzia tetrasticha (1)
Huperzia trifoliata (1)
Huperzia vanikorensis (1)
Hyacinthinus orientalis (5)
Hyacinthoides hispanica (11)
Hyacinthoides lingulata (2)
Hyacinthoides non-scripta (6)
Hyacinthoides x massartiana (3)
Hyacinthus orientalis (8)
Hyalis argentea (5)
Hyalis argentea var. latisquama (5)
Hyalosperma cotula (3)
Hybanthus calycinus (1)
Hydnophytum formicarum (2)
Hydrangea anomala ssp. petiolaris (2)
Hydrangea arborescens (4)
Hydrangea aspera (1)
Hydrangea chinensis (1)
Hydrangea cinerea (22)
Hydrangea macrophylla (56)
Hydrangea macrophylla ssp. macrophylla (1)
Hydrangea macrophylla ssp. serrata (1)
Hydrangea paniculata (21)
Hydrangea quercifolia (20)
Hydrangea serrata (1)
Hydrangea serratifolia (10)
Hydrangea sp. (1)
Hydrangea villosa (1)
Hydrastis canadensis (2)
Hydriastele pinangoides (1)
Hydrilla verticillata (37)
Hydrocharis morsus-ranae (2)
Hydroclathrus clathratus (2)
Hydrocleys nymphoides (1)
Hydrocotyle moschata (6)
Hydrocotyle ranunculoides (42)
Hydrocotyle sibthorpioides (7)
Hydrocotyle sp. (1)
Hydrocotyle umbellata (17)
Hydrocotyle verticillata (39)
Hydrocotyle verticillata var. triradiata (1)
Hydrocotyle vulgaris (1)
Hydrogrimmia mollis (1)
Hydrolea corymbosa (1)
Hydrolithon (6)
Hydrolithon reinboldii (2)
Hydrophyllum alpestre (26)
Hydrophyllum appendiculatum (3)
Hydrophyllum canadense (9)
Hydrophyllum capitatum (11)
Hydrophyllum capitatum var. alpinum (51)
Hydrophyllum capitatum var. alpium (3)
Hydrophyllum capitatum var. capitatum (4)
Hydrophyllum capitatum var. thompsonii (2)
Hydrophyllum fendleri (4)
Hydrophyllum fendleri var. albifrons (8)
Hydrophyllum occidentale (113)
Hydrophyllum sp. (1)
Hydrophyllum tenuipes (23)
Hydrophyllum virginianum (12)
Hygrohypnum alpinum (2)
Hygrohypnum ochraceum (2)
Hygrophila polysperma (2)
Hylocereus costaricensis (1)
Hylocereus lemairei (3)
Hylocereus sp. (5)
Hylocereus triangularis (1)
Hylocereus undatus (12)
Hylocomium splendens (15)
Hyloetelephium sp. (2)
Hylomecon japonicum (1)
Hylomecon vernalis (7)
Hylotelephium erythrostictum fa. variegatum (1)
Hylotelephium sieboldii (3)
Hylotelephium spectabile (6)
Hylotelephium telephium ssp. maximum (9)
Hylotelephium telephium ssp. telephium (8)
Hymemoxys odorata (1)
Hymenocallis caroliniana (3)
Hymenocallis latifolia (1)
Hymenocallis liriosme (1)
Hymenocallis littoralis (3)
Hymenocallis narcissiflora (1)
Hymenocallis occidentalis var. occidentalis (1)
Hymenocallis pedalis (1)
Hymenocallis sp. (4)
Hymenocardia ulmoides (2)
Hymenoclea monogyra (2)
Hymenoclea salsola (4)
Hymenoclea salsola var. hybrid (4)
Hymenoclea salsola var. salsola (1)
Hymenolepis parviflora (3)
Hymenopappus artemisiifolius var. artemisiifolius (4)
Hymenopappus biennis (7)
Hymenopappus filifolius (41)
Hymenopappus filifolius var. eriopodus (9)
Hymenopappus filifolius var. lugens (52)
Hymenopappus filifolius var. luteus (4)
Hymenopappus filifolius var. megacephalus (15)
Hymenopappus filifolius var. nanus (37)
Hymenopappus filifolius var. polycephalus (6)
Hymenopappus fillifolius var. lugens (2)
Hymenopappus flavescens var. canotomentosus (21)
Hymenopappus mexicanus (7)
Hymenopappus scabroaeus var. corymbosus (4)
Hymenopappus tenuifolius (3)
Hymenophyllum demissum (1)
Hymenophyllum digitatum (14)
Hymenophyllum flabellatum (17)
Hymenophyllum involucratum (1)
Hymenophyllum javanicum (18)
Hymenophyllum leptocarpum (1)
Hymenophyllum multifidum (23)
Hymenophyllum pallidum (13)
Hymenophyllum polyanthos (15)
Hymenophyllum tunbrigense (5)
Hymenophyllum wilsonii (1)
Hymenosporum flavum (23)
Hymenostylium recurvirostrum (4)
Hymenothrix dissecta (44)
Hymenothrix loomisii (3)
Hymenothrix palmeri (4)
Hymenothrix pedata (9)
Hymenothrix wislizeni (21)
Hymenothrix wrightii (51)
Hymenoxys acaulis (1)
Hymenoxys acaulis var. arizonica (1)
Hymenoxys acaulis var. caespitosa (2)
Hymenoxys cooperi (92)
Hymenoxys grandiflora (29)
Hymenoxys hoopesii (98)
Hymenoxys lemmonii (14)
Hymenoxys odorata (23)
Hymenoxys richardsonii (2)
Hymenoxys richardsonii var. floribunda (20)
Hyobanche sanguinea (1)
Hyophorbe lagenicaulis (13)
Hyophorbe verschaffeltii (2)
Hyoscyamus albus (12)
Hyoscyamus muticus (1)
Hyoscyamus niger (19)
Hyoseris radiata (9)
Hyoseris scabra (1)
Hyparrhenia hirta (6)
Hyparrhenia rufa (3)
Hypecoum imberbe (3)
Hyperacanthus amoenus (3)
Hypericum (1)
Hypericum anagalloides (77)
Hypericum androsaemum (5)
Hypericum balearicum (1)
Hypericum boreale (3)
Hypericum californicum (1)
Hypericum calycinum (8)
Hypericum canadense (3)
Hypericum canariense (20)
Hypericum chapmanii (1)
Hypericum concinnum (55)
Hypericum crux-andraea (1)
Hypericum formosum (7)
Hypericum formosum ssp. scouleri (3)
Hypericum formosum var. scouleri (5)
Hypericum forrestii (1)
Hypericum frondosum (17)
Hypericum gebleri (12)
Hypericum glandulosum (3)
Hypericum grandifolium (10)
Hypericum graveolens (10)
Hypericum hirsutum (4)
Hypericum humifusum (1)
Hypericum hypericoides ssp. multicaule (18)
Hypericum kouytchense (1)
Hypericum majus (9)
Hypericum mutilum ssp. mutilum (3)
Hypericum patulum (4)
Hypericum perforatum (134)
Hypericum perforatum ssp. perforatum (7)
Hypericum prolificum (19)
Hypericum punctatum (12)
Hypericum pyramidatum (13)
Hypericum reptans (1)
Hypericum revolutum (1)
Hypericum scouleri (83)
Hypericum scouleri ssp. nortonia (1)
Hypericum scouleri var. scouleri (3)
Hypericum sp. (2)
Hypericum sphaerocarpum (9)
Hypericum tetrapetalum (1)
Hypericum tetrapterum (3)
Hypericum triquetrifolium (7)
Hypericum x inodorum (2)
Hypertelis angrae-peqhenae (2)
Hypertelis salsoloides var. salsoloides (2)
Hyphaene coriacea (1)
Hyphaene thebaica (4)
Hypnea (1)
Hypnea esperi (7)
Hypnea pannosa (4)
Hypnea saidana (7)
Hypnea spinella (3)
Hypnum cupressiforme var. cupressiforme (11)
Hypnum revolutum (2)
Hypnum subimponens (4)
Hypocalymma xanthopetalum (3)
Hypochaeris glabra (126)
Hypochaeris incana (5)
Hypochaeris radicata (148)
Hypochaeris sessiliflora (1)
Hypochaeris taraxacoides (1)
Hypochoeris achyrophorus (6)
Hypoestes phyllostachya (9)
Hypoestes phyllostachys (3)
Hypoglossum abyssicola (1)
Hypoglossum simulans (2)
Hypolepis dicksonioides (4)
Hypolepis minima (1)
Hypolepis sparsisora (1)
Hypolepis tenuifolia (13)
Hypopitys monotropa (11)
Hypopitys uniflora (5)
Hypoxis angustifolia (1)
Hypoxis hemerocallidea (1)
Hypoxis hirsuta (18)
Hypoxis mexicana (12)
Hypoxis obtusa (1)
Hypseocharis pimpinelifolius (4)
Hyptis albida (10)
Hyptis capitata (1)
Hyptis decipiens (5)
Hyptis emoryi (22)
Hyptis laniflora (13)
Hyptis mutabilis (7)
Hyssopus officinalis (4)