Haageocereus acranthus (2)
Haageocereus bieblii (4)
Haageocereus bylesianus (1)
Haageocereus decumbens (1)
Haageocereus versicolor var. aureispinus (2)
Habenaria (2)
Habenaria caffra (5)
Habenaria clypeata (5)
Habenaria floribunda (9)
Habenaria lithophila (3)
Habenaria medusa (3)
Habenaria monorhiza (5)
Habenaria monorrhiza (5)
Habenaria nyikana (5)
Habenaria onorrhiza (1)
Habenaria repens (4)
Habenaria rhodocheila (2)
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)
Haemanthus albiflos (9)
Haemanthus coccineus (15)
Haemanthus humilis (3)
Haematopus moquini (1)
Haematoxylum brasiletto (36)
Hainardia cylindrica (19)
Hakea amplexicaulis (2)
Hakea archaeoides (2)
Hakea bucculenta (1)
Hakea drupacea (13)
Hakea eriantha (3)
Hakea incrassata (1)
Hakea laurina (1)
Hakea petiolaris (5)
Hakea salicifolia (5)
Hakea sericea (6)
Hakea suaveolens (7)
Hakonechloa macra (4)
Halenia deflexa (14)
Halenia recurva (14)
Halenia umbellata (2)
Halerpestes cymbalaria (24)
Halesia carolina (21)
Halesia diptera (3)
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 halimifolium ssp. halimifolium (1)
Halimium x pauanum (1)
Halimodendron halodendron (6)
Halimolobos jaegeri (28)
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 (2)
Hamelia axillaris (3)
Hamelia patens var. patens (1)
Hammarbya paludosa (2)
Handoanthus impetiginosus (3)
Handroanthus chrysanthus (2)
Handroanthus chrysotrichus (30)
Handroanthus impetiginosus (12)
Haplocarpha scaposa (1)
Haploesthes greggii var. texana (21)
Haplopappus crocea (6)
Haplopappus foliosus (14)
Haplopappus macrocephalus (8)
Haplopappus sp. (1)
Haplophyllum patavinum (1)
Haplopteris elongata (7)
Haplopteris ensiformis (1)
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)
Hartmaniella sierrae (25)
Harveya speciosa (1)
Hasteola suaveolens (2)
Hastingsia alba (72)
Hastingsia bracteosa var. atropurpurea (6)
Hastingsia bracteosa var. bracteosa (4)
Hastingsia serpenticola (4)
Hastingsia serpentinicola (35)
Hastingsia sp. (3)
Hatiora salicornioides (5)
Hauya elegans ssp. cornuta (4)
Havardia pallens (5)
Hawkesiophyton ulei (3)
Hawortha emelyea var. major (1)
Haworthia angustifolia (1)
Haworthia arachnoidea (1)
Haworthia bayeri (1)
Haworthia bolusii (2)
Haworthia bolusii var. blackbeardeana (1)
Haworthia bolusii var. blackbeardiana (2)
Haworthia coarctata (1)
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 cooperi var. venusta (1)
Haworthia cymbiformis var. cymbiformis (2)
Haworthia cymbiformis var. incurvula (1)
Haworthia cymbiformis var. setulifera (1)
Haworthia decipiens var. virella (2)
Haworthia emelyae (4)
Haworthia emelyae var. comptoniana (2)
Haworthia emelyae var. major (2)
Haworthia kegani (1)
Haworthia keganii (1)
Haworthia magnifica var. asperula (1)
Haworthia maughanii (2)
Haworthia mirabilis var. badia (1)
Haworthia pygmaea var. acuminata (1)
Haworthia pygmaea x haworthia truncata (1)
Haworthia reinwardtii (7)
Haworthia reticulata var. hurlingii (1)
Haworthia reticulata var. subregularis (1)
Haworthia retusa (5)
Haworthia rossouwii (1)
Haworthia sp. (23)
Haworthia splendens (1)
Haworthia springbokvlakensis (3)
Haworthia truncata (1)
Haworthia truncata var. maughanii (2)
Haworthia turgida (1)
Haworthia turgida var. longibracteata (1)
Haworthia turgida var. suberecta (1)
Haworthia venosa ssp. tesselata (1)
Haworthia venosa var. tesselata (1)
Haworthiopsis attenuata (2)
Haworthiopsis attenuata var. radula (2)
Haworthiopsis coarctata (1)
Haworthiopsis coarctata var. coarctata (1)
Haworthiopsis fasciata (1)
Haworthiopsis glauca var. herrei (1)
Haworthiopsis koelmaniorum (2)
Haworthiopsis limifolia (2)
Haworthiopsis reinwardtii (2)
Haworthiopsis venosa (4)
Hazardia cana (6)
Hazardia detonsa (39)
Hazardia ferrisiae (1)
Hazardia orcuttii (21)
Hazardia squarrosa (45)
Hazardia squarrosa var. grindelioides (10)
Hazardia squarrosa var. squarrosa (14)
Hazardia stenolepis (6)
Hazardia whitneyi (2)
Hazardia whitneyi var. discoidea (9)
Hazardia whitneyi var. whitneyi (25)
Hebe andersonii (1)
Hebe hybrid (6)
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 (49)
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 flavum (1)
Hedychium gardnerianum (13)
Hedychium grandiflorum (3)
Hedychium spicatum (3)
Hedychium villosum var. tenuiflorum (3)
Hedychium yunnanense (2)
Hedyotis sp. (1)
Hedypnois cretica (15)
Hedypnois rhagadioloides (74)
Hedysarum alpinum (1)
Hedysarum boreale (26)
Hedysarum boreale var. boreale (7)
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 (64)
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 (105)
Helenium sp. (2)
Helenium vernale (3)
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. nevadensis (2)
Helianthella californica var. (1)
Helianthella californica var. californica (30)
Helianthella californica var. nevadensis (69)
Helianthella californica var. shastensis (19)
Helianthella castanea (54)
Helianthella parryi (4)
Helianthella quinquenervis (5)
Helianthella uniflora (23)
Helianthella uniflora var. uniflora (6)
Helianthemum apenninum (5)
Helianthemum chihuahuensis (3)
Helianthemum nummularium (7)
Helianthemum nummularium ssp. grandiflorum (5)
Helianthemum oelandicum ssp. alpestre (3)
Helianthemum salicifolium (6)
Helianthus angustifolius (9)
Helianthus annuus (175)
Helianthus anomala (2)
Helianthus argophyllus (10)
Helianthus atrorubens (4)
Helianthus bolanderi (118)
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 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. tephrodes (67)
Helianthus nuttallii (14)
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 petiolaris subsp. canescens (2)
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 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 sp. (6)
Helichrysum splendidum (3)
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 (31)
Heliomeris multiflora var. multiflora (15)
Heliomeris multiflora var. nevadensis (56)
Heliophila africana (2)
Heliophila coronopifolia (3)
Heliopsis annua (9)
Heliopsis helianthoides (22)
Heliopsis helianthoides var. scabra (26)
Heliopsis parvifolia (43)
Heliosperma alpestre (3)
Heliosperma pusillum (4)
Heliotropium amplexicaule (16)
Heliotropium angiospermum (3)
Heliotropium anomalum (11)
Heliotropium arborescens (8)
Heliotropium arboreum (32)
Heliotropium convolvulaceum var. californicum (10)
Heliotropium curassavicum (91)
Heliotropium curassavicum var. curassavicum (7)
Heliotropium curassavicum var. oculatum (69)
Heliotropium europaeum (10)
Heliotropium linariifolium (2)
Heliotropium sp. (2)
Heliotropium steudneri (1)
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)
Hellenia speciosa (3)

Helmholtzia glaberrima (1)
Helminthotheca echioides (130)
Helodium blandowii (10)
Helonias thibetica (2)
Helonias umbellata (6)
Helosciadium nodiflorum (8)
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)
Hemionitis andromedifolia (10)
Hemionitis angelica (6)
Hemionitis arifolia (2)
Hemionitis atropurpurea (10)
Hemionitis beitelii (3)
Hemionitis bipinnata (2)
Hemionitis bolborrhiza (1)
Hemionitis bonariensis (12)
Hemionitis brachyptera (4)
Hemionitis bradburyi (1)
Hemionitis brandegeei (1)
Hemionitis breweri (1)
Hemionitis calomelanos (1)
Hemionitis candida (1)
Hemionitis clevelandii (2)
Hemionitis cochisensis (3)
Hemionitis concolor (6)
Hemionitis covillei (2)
Hemionitis densa (14)
Hemionitis eatonii (2)
Hemionitis eckloniana (2)
Hemionitis feei (3)
Hemionitis fendleri (1)
Hemionitis fractifera (1)
Hemionitis glabella (4)
Hemionitis glutinosa (1)
Hemionitis gracillima (14)
Hemionitis integerrima (2)
Hemionitis intramarginalis (1)
Hemionitis lanosa (2)
Hemionitis lendigera (2)
Hemionitis limitanea (3)
Hemionitis lindheimeri (3)
Hemionitis marantae (2)
Hemionitis mexicana (2)
Hemionitis multifida (1)
Hemionitis nivea (1)
Hemionitis nobilis (2)
Hemionitis notholaenoides (4)
Hemionitis nudiuscula (9)
Hemionitis opposita (2)
Hemionitis ovata (4)
Hemionitis parryi (1)
Hemionitis pruinata (1)
Hemionitis pteridioides (1)
Hemionitis rotundifolia (5)
Hemionitis scariosa (1)
Hemionitis seticaulis (2)
Hemionitis sinuata (6)
Hemionitis ternifolia (3)
Hemionitis triangularis (6)
Hemionitis truncata (3)
Hemionitis viscosa (1)
Hemionitis wootonii (8)
Hemionitis wrightiana (2)
Hemitomes congestum (34)
Hemizonella minima (81)
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 luzulaefolia (3)
Hemizonia luzulafolia (5)
Hemizonia pungens ssp. pungens (1)
Henckelia moonii (1)
Hennediella stanfordensis (4)
Henrya insularis (10)
Hepatica americana (24)
Hepatica americana var. acuta (42)
Hepatica americana var. americana (2)
Hepatica nobilis (28)
Heptacodium miconioides (11)
Heptacodium miconiooides (2)
Heptapleurum actinophyllum (15)
Heptapleurum arboricola (8)
Heptapleurum calyptratum (8)
Heptapleurum delavayi (7)
Heptapleurum microphyllum (4)
Heracleum austriacum ssp. siifolium (3)
Heracleum mantegazzianum (3)
Heracleum maximum (214)
Heracleum sphondylium (13)
Heracleum sphondylium ssp. elegans (1)
Heracleum sphondylium ssp. montanum (21)
Heracleum spondylium ssp. montanum (1)
Herbertus aduncus (7)
Hereroa sp. (1)
Hereroa wilmaniae (2)
Hereromeles arbutifolia (1)
Herissantia crispa (23)
Hermannia palmeri (21)
Hermannia pinnata (2)
Hermannia texana (9)
Herminium monorchis (19)
Hernandia moerenhoutiana campanulata (3)
Hernandia nymphaeifolia (5)
Hernandia ovigera (1)
Herniaria cinerea (6)
Herniaria glabra (8)
Herniaria hirsuta (17)
Herniaria hirsuta var. cinerea (7)
Herniaria hirsuta var. hirsuta (11)
Herniaria incana (1)
Herposiphonia tenella (1)
Herrania balaensis (1)
Herrickia glauca var. glauca (3)
Herrisantia crispa (5)
Hertia cheirifolia (1)
Hesperalbizia occidentalis (19)
Hesperaloe funifera (10)
Hesperaloe parviflora (10)
Hesperantha baurii (1)
Hesperantha coccinea (8)
Hesperantha vaginata (2)
Hesperevax acaulis (11)
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 (2)
Hesperis matronalis (25)
Hesperocallis undulata (284)
Hesperochiron nanus (74)
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 arizonica (6)
Hesperocyparis bakeri (78)
Hesperocyparis forbesii (54)
Hesperocyparis glabra (9)
Hesperocyparis goveniana (23)
Hesperocyparis lusitanica (12)
Hesperocyparis macnabiana (65)
Hesperocyparis macrocarpa (84)
Hesperocyparis montana (4)
Hesperocyparis nevadensis (32)
Hesperocyparis pigmaea (48)
Hesperocyparis pygmaea (3)
Hesperocyparis revealiana (8)
Hesperocyparis sargentii (63)
Hesperocyparis stephensonii (9)
Hesperolinon adenophyllum (21)
Hesperolinon bicarpellatum (31)
Hesperolinon breweri (22)
Hesperolinon californicum (24)
Hesperolinon clevelandii (9)
Hesperolinon congestum (68)
Hesperolinon didymocarpum (12)
Hesperolinon disjunctum (44)
Hesperolinon drymarioides (11)
Hesperolinon micranthum (17)
Hesperolinon serpentinum (8)
Hesperolinon sharsmithiae (4)
Hesperolinon spergulinum (13)
Hesperolinon tehamense (13)
Hesperomecon linearis (44)
Hesperostipa comata (12)
Hesperostipa comata ssp. comata (7)
Hesperostipa neomexicana (2)
Hesperostipa spartea (12)
Hesperoyucca whipplei (284)
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 (224)
Heteromeles arbutifolia var. arbutifolia (1)
Heteromorpha arborescens (5)
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)
Heterospermum pinnatum (1)
Heterotheca ballardii (9)
Heterotheca bolanderi (9)
Heterotheca camporum (3)
Heterotheca fulcrata (12)
Heterotheca grandiflora (197)
Heterotheca hirsutissima (1)
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 pedunculata (13)
Heterotheca resinolens (2)
Heterotheca sessiliflora (16)
Heterotheca sessiliflora ssp. bolanderi (97)
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 (67)
Heterotheca villosa var. minor (33)
Heterotheca villosa var. villosa (4)
Heterotheca viscida (10)
Heterotis rotundifolia (2)
Heuchera abramsii (1)
Heuchera bracteata (4)
Heuchera brevistaminea (7)
Heuchera caespitosa (38)
Heuchera chlorantha (4)
Heuchera cylindrica (29)
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 mexicana var. mexicana (1)
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 (83)
Heuchera sanguinea (9)
Heuchera sp. (42)
Heuchera villosa (2)
Heuchera X (3)
Heuchera x micrantha (2)
Heucherella sp. (2)
Hexalobus monopetalus (17)
Hexaphylla hirta (4)
Hexasepalum teres (9)
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 clayi (5)
Hibiscus coccineus (4)
Hibiscus coulteri (23)
Hibiscus denudatus (97)
Hibiscus engleri (3)
Hibiscus flavifolius (1)
Hibiscus kokio ssp. kokio (4)
Hibiscus kokio ssp. saintjohnianus (6)
Hibiscus laevis (1)
Hibiscus lasiocarpos (19)
Hibiscus lasiocarpos var. occidentalis (35)
Hibiscus meyeri ssp. meyeri (1)
Hibiscus moschatus (1)
Hibiscus moscheutos (16)
Hibiscus moscheutos ssp. moscheutos (3)
Hibiscus mutabilis (6)
Hibiscus pedunculatus (3)
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 striatus ssp. striatus (8)
Hibiscus syriacus (30)
Hibiscus taiwanensis (4)
Hibiscus tiliaceus (28)
Hibiscus tiliaceus ssp. tiliaceus (4)
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 argutum (31)
Hieracium bolanderi (11)
Hieracium dollineri (6)
Hieracium fendleri (3)
Hieracium glaucinum ssp. petiolare (1)
Hieracium greenei (13)
Hieracium horridum (110)
Hieracium lachenalii (3)
Hieracium lachenalii ssp. lachenalii (3)
Hieracium longipilum (11)
Hieracium magellanicum (2)
Hieracium megacephalum (3)
Hieracium murorum (5)
Hieracium nudicaule (1)
Hieracium paniculatum (3)
Hieracium pannosum (5)
Hieracium parryi (15)
Hieracium pilosum (2)
Hieracium pringlei (1)
Hieracium robinsonii (5)
Hieracium sabaudum ssp. vagum (3)
Hieracium scabrum (8)
Hieracium scabrum var. scabrum (3)
Hieracium scouleri (33)
Hieracium sp. (1)
Hieracium sylvularum (2)
Hieracium triste (33)
Hieracium umbellatum (33)
Hieracium venosum (1)
Hieracium villosum (3)
Hilaria jamesii (29)
Hilaria mutica (12)
Hilaria rigida (76)
Hildenbrandia galapagensis (1)
Hildewintera colademononsis (1)
Hillebrandia sandwicensis (2)
Hillia parasitica (1)
Hilliardiella capensis (3)
Himantoglossum adriaticum (11)
Himantoglossum hircinum (29)
Himantoglossum robertianum (10)
Hintonia latiflora (7)
Hippeastrum puniceum (1)
Hippeastrum sp. (8)
Hippeastrum stylosum (6)
Hippeastrum vittatum (1)
Hippobroma longiflora (10)
Hippocrepis comosa (19)
Hippocrepis emerus ssp. emeroides (4)
Hippocrepis unisiliquosa (5)
Hippophae rhamnoides (10)
Hippuris montana (1)
Hippuris vulgaris (39)
Hiraea grandifolia (1)
Hiraea reclinata (2)
Hirschfeldia incana (88)
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 (18)
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 (6)
Holocarpha heermannii (72)
Holocarpha macradenia (38)
Holocarpha obconica (32)
Holocarpha virgata (25)
Holocarpha virgata ssp. elongata (10)
Holocarpha virgata ssp. virgata (64)
Holodiscus australis (2)
Holodiscus boissieri (1)
Holodiscus discolor (123)
Holodiscus discolor var. cedrorum (3)
Holodiscus discolor var. discolor (42)
Holodiscus discolor var. glabrescens (26)
Holodiscus discolor var. microphyllus (73)
Holodiscus dumosa (1)
Holodiscus dumosus var. cedorus (4)
Holodiscus glabrescens (1)
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)
Homalolepis cedron (11)
Homalothecium arenarium (5)
Homalothecium californicum (5)
Homalothecium nevadense (6)
Homalothecium nuttallii (4)
Homalothecium pinnatifidum (10)
Homalothecium pinnatifidum? (1)
Homalothecium sp. (8)
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 (7)
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 (3)
Horkelia clevelandii var. clevelandii (30)
Horkelia cuneata (14)
Horkelia cuneata var. cuneata (36)
Horkelia cuneata var. puberula (27)
Horkelia cuneata var. sericea (9)
Horkelia daucifolia (8)
Horkelia daucifolia var. daucifolia (16)
Horkelia daucifolia var. indicta (15)
Horkelia fusca (21)
Horkelia fusca var. brownii (9)
Horkelia fusca var. parviflora (37)
Horkelia fusca var. tenella (5)
Horkelia hispidula (20)
Horkelia marinensis (68)
Horkelia parryi (33)
Horkelia rydbergii (19)
Horkelia sericata (5)
Horkelia sp. (2)
Horkelia tenuiloba (14)
Horkelia tridentata (31)
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 (9)
Horkeliella congdonis (14)
Horkeliella purpurascens (22)
Hormidium prismatocarpum (1)
Horminum pyrenaicum (5)
Hormosira banksii (3)
Hornungia alpina (10)
Hornungia procumbens (22)
Horsfordia alata (25)
Horsfordia newberryi (57)
Hosackia crassifolia (35)
Hosackia crassifolia var. crassifoia (1)
Hosackia crassifolia var. crassifolia (101)
Hosackia crassifolia var. otayensis (47)
Hosackia gracilis (95)
Hosackia incana (14)
Hosackia oblongifolia (34)
Hosackia oblongifolia var. cuprea (30)
Hosackia oblongifolia var. oblongifolia (89)
Hosackia pinnata (52)
Hosackia rosea (24)
Hosackia stipularis (6)
Hosackia stipularis var. ottleyi (13)
Hosackia stipularis var. stipularis (25)
Hosackia yollabolliensis (15)
Hosta seiboldiana (1)
Hosta sieboldiana (1)
Hosta sp. (8)
Hosta tokudama (1)
Hosta tosana (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 procumbens (1)
Houstonia purpurea var. purpurea (14)
Houstonia rubra (14)
Houstonia serpyllifolia (6)
Houstonia wrightii (1)
Houttuynia cordata (10)
Hovea elliptica (6)
Hovea trisperma (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 verticillata var. verticillata (1)
Hudsonia tomentosa (4)
Huechera rubescens (4)
Huernia keniensis (2)
Huernia kennedyana (1)
Huernia pillansii (1)
Huernia schneideriana (2)
Huernia thuretii (3)
Huernia transvaalensis (1)
Huernia zebrina ssp. insigniflora (1)
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 subsp. vestita (1)
Humata anderssonii (8)
Humulus lupulus (36)
Humulus sp. (1)
Hunnemannia fumarifolia (2)
Hunnemannia fumariifolia (18)
Huperzia appalachiana (3)
Huperzia brassii (1)
Huperzia carinata (1)
Huperzia copelandiana (1)
Huperzia copelandii (1)
Huperzia crassa (2)
Huperzia foliosa (1)
Huperzia kajewskii (1)
Huperzia lucidula (17)
Huperzia parksii (1)
Huperzia phlegmaria (6)
Huperzia reflexa (2)
Huperzia ribourtii (16)
Huperzia saururus (1)
Huperzia selago (10)
Huperzia squarrosa (17)
Huperzia taxifolia (1)
Huperzia tetrasticha (1)
Huperzia trifoliata (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)
Hydnophytum formicarum (2)
Hydrangea arborescens (4)
Hydrangea arguta (6)
Hydrangea aspera (2)
Hydrangea chinensis (1)
Hydrangea cinerea (22)
Hydrangea febrifuga (10)
Hydrangea macrophylla (59)
Hydrangea macrophylla ssp. macrophylla (1)
Hydrangea paniculata (21)
Hydrangea petiolaris (2)
Hydrangea quercifolia (21)
Hydrangea serrata (2)
Hydrangea serratifolia (10)
Hydrangea sp. (1)
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 (40)
Hydrocotyle vulgaris (1)
Hydrogrimmia mollis (1)
Hydrolea corymbosa (1)
Hydrolithon (6)
Hydrolithon reinboldii (2)
Hydrophyllum alpestre (82)
Hydrophyllum appendiculatum (3)
Hydrophyllum canadense (9)
Hydrophyllum capitatum (11)
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 sp. (5)
Hylocomium splendens (15)
Hylodesmum glutinosum (17)
Hyloetelephium sp. (2)
Hylomecon japonicum (1)
Hylomecon vernalis (7)
Hylotelephium cauticola (4)
Hylotelephium erythrostictum fa. variegatum (1)
Hylotelephium maximum (9)
Hylotelephium sieboldii (3)
Hylotelephium spectabile (6)
Hylotelephium telephium (1)
Hylotelephium telephium ssp. telephium (8)
Hymemoxys odorata (1)
Hymenocallis latifolia (1)
Hymenocallis liriosme (1)
Hymenocallis littoralis (4)
Hymenocallis occidentalis var. occidentalis (1)
Hymenocallis sp. (4)
Hymenocardia ulmoides (2)
Hymenoclea salsola var. hybrid (4)
Hymenolepis crithmifolia (3)
Hymenolepis incisa (5)
Hymenopappus artemisiifolius var. artemisiifolius (4)
Hymenopappus biennis (7)
Hymenopappus filifolius (41)
Hymenopappus filifolius var. eriopodus (9)
Hymenopappus filifolius var. filifolius (3)
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)
Hymenophyllum demissum (1)
Hymenophyllum digitatum (14)
Hymenophyllum flabellatum (17)
Hymenophyllum involucratum (1)
Hymenophyllum javanicum (18)
Hymenophyllum lanceolatum (2)
Hymenophyllum lineare (1)
Hymenophyllum multifidum (23)
Hymenophyllum nephrophyllum (3)
Hymenophyllum pallidum (13)
Hymenophyllum penangianum (1)
Hymenophyllum polyanthos (16)
Hymenophyllum tunbrigense (5)
Hymenosporum flavum (23)
Hymenostylium recurvirostrum (4)
Hymenothrix dissecta (50)
Hymenothrix loomisii (3)
Hymenothrix palmeri (4)
Hymenothrix pedata (15)
Hymenothrix wislizeni (21)
Hymenothrix wrightii (51)
Hymenoxys cooperi (92)
Hymenoxys grandiflora (41)
Hymenoxys hoopesii (103)
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 (8)
Hyparrhenia rufa (3)
Hypecoum imberbe (3)
Hyperacanthus amoenus (3)
Hypericum (1)
Hypericum anagalloides (77)
Hypericum androsaemum (5)
Hypericum ascyron ssp. gebleri (12)
Hypericum ascyron ssp. pyramidatum (13)
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 forrestii (1)
Hypericum fraseri (21)
Hypericum frondosum (17)
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 reptans (1)
Hypericum revolutum (1)
Hypericum scouleri (88)
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 virginicum (1)
Hypericum x inodorum (2)
Hypertelis angrae-peqhenae (2)
Hypertelis salsoloides var. salsoloides (2)
Hypertelis umbellata (6)
Hyphaene coriacea (3)
Hyphaene petersiana (5)
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 (152)
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)
Hypoxis angustifolia (1)
Hypoxis baurii (1)
Hypoxis hemerocallidea (1)
Hypoxis hirsuta (18)
Hypoxis mexicana (12)
Hypoxis obtusa (1)
Hypseocharis pimpinelifolius (4)
Hyptis capitata (1)
Hyssopus officinalis (1)