Complete list of species
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| scientific name | common name(s) | image gallery |
| Hamamelis vernalis | Ozark Witch-hazel Vernal Witch-hazel | |
| Hamamelis virginiana | Witch-hazel American Witch-hazel Common Witch-hazel Winterbloom Snapping Hazelnut Striped Alder Spotted Alder Tobacco-wood Water-witch | |
| Hamelia patens | Scarletbush Firebush Hummingbird Bush Scarlet Bush Redhead | |
| Haploesthes greggii | False Broomweed | |
| Haploesthes greggii var. texana | Texas False Broomweed | |
| Haplophyton crooksii | Cockroach Plant Cockroachplant | |
| Haplostachys bryanii | Molokai Islandmint Molokai Island-mint | |
| Haplostachys haplostachya | Honohono | |
| Haplostachys linearifolia | Woodland Islandmint Woodland Island-mint | |
| Haplostachys munroi | Lanai Islandmint Lanai Island-mint Lanai Island-mint Lanai Island-mint Lanai Island-mint | |
| Haplostachys truncata | Maui Islandmint Maui Island-mint | |
| Harbouria trachypleura | Whiskbroom Parsley | |
| Harmonia doris-nilesiae | Serpentine Tarweed | |
| Harmonia guggolziorum | Tarweed | |
| Harmonia hallii | Hall's Madia | |
| Harmonia nutans | Nodding Madia | |
| Harmonia stebbinsii | Stebbins' Tarweed | |
| Harpagonella palmeri | Palmer's Grapplinghook Palmer's Grappling-hook | |
| Harpagonella palmeri var. arizonica | Arizona Grapplinghook Arizona Grappling-hook | |
| Harpagonella palmeri var. palmeri | Palmer's Grapplinghook Palmer's Grappling-hook | |
| Harperocallis flava | Harper's Beauty | |
| Harrimanella hypnoides | Moss Heather Mossplant | |
| Harrimanella stelleriana | Alaska Bellheather Alaska Moss Heather | |
| Harrisella porrecta | Jingle Bell Orchid Needleroot Airplant Orchid Needleroot Orchid | |
| Harrisia aboriginum | Aboriginal Prickly Apple Prickly Applecactus Yellow Prickly Apple | |
| Harrisia eriophora | Fragrant Applecactus Fragrant Prickly Apple | |
| Harrisia fragrans | Caribbean Applecactus Fragrant Prickly Apple | |
| Harrisia simpsonii | Simpson's Applecactus | |
| Hartwrightia floridana | Florida Hartwrightia | |
| Hasteola robertiorum | Hammockherb | |
| Hasteola suaveolens | False Indian Plantain Sweet Indian Plantain | |
| Hastingsia alba | White Rushlily | |
| Hastingsia bracteosa | Largeflower Rushlily | |
| Hastingsia bracteosa var. atropurpurea | Purple Rushlily | |
| Hastingsia bracteosa var. bracteosa | Largeflower Rushlily | |
| Hastingsia serpentinicola | Klamath Rushlily Siskiyou Hastingsia | |
| Havardia pallens | Tenaza Huajillo Ape's Ear-ring | |
| Hazardia brickellioides | Brickellbush Bristleweed Brickellbush Goldenweed | |
| Hazardia cana | Island Hazardia San Clemente Island Bristleweed | |
| Hazardia detonsa | Island Bristleweed | |
| Hazardia orcuttii | Orcutt's Bristleweed | |
| Hazardia squarrosa | Saw-tooth Bristleweed Sawtooth Bristleweed Sawtooth Goldenbush | |
| Hazardia squarrosa var. grindelioides | Sawtooth Bristleweed | |
| Hazardia squarrosa var. obtusa | Sawtooth Bristleweed | |
| Hazardia squarrosa var. squarrosa | Sawtooth Goldenbush | |
| Hazardia stenolepis | Serpentine Bristleweed | |
| Hazardia whitneyi | Whitney's Bristleweed | |
| Hazardia whitneyi var. discoidea | Whitney's Bristleweed | |
| Hazardia whitneyi var. whitneyi | Whitney's Bristleweed | |
| Hecastocleis shockleyi | Prickle-leaf Prickleleaf | |
| Hechtia glomerata | Guapilla | |
| Hechtia texensis | Texas False Agave Guapilla | |
| Hedeoma acinoides | Slender False Pennyroyal Annual Pennyroyal Slender Hedeoma | |
| Hedeoma apiculata | Mckittrick's False Pennyroyal | |
| Hedeoma costata | Ribbed False Pennyroyal False Pennyroyal Falsepennyroyal | |
| Hedeoma costata var. pulchella | Ribbed False Pennyroyal False Pennyroyal Falsepennyroyal | |
| Hedeoma dentata | Dentate False Pennyroyal Arizona False Pennyroyal Dentate Falsepennyroyal | |
| Hedeoma diffusa | Spreading False Pennyroyal Flagstaff False Pennyroyal Flagstaff Pennyroyal | |
| Hedeoma drummondii | Drummond's False Pennyroyal Limoncillo Mock Pennyroyal | |
| Hedeoma hispida | Rough False Pennyroyal | |
| Hedeoma hyssopifolia | Aromatic False Pennyroyal Mock Pennyroyal Falsepennyroyal | |
| Hedeoma mollis | Softhair False Pennyroyal | |
| Hedeoma nana | Dwarf False Pennyroyal | |
| Hedeoma nana ssp. californica | California False Pennyroyal California Falsepennyroyal California Mock Pennyroyal | |
| Hedeoma nana ssp. macrocalyx | Dwarf False Pennyroyal False Pennyroyal Falsepennyroyal | |
| Hedeoma nana ssp. nana | Dwarf False Pennyroyal | |
| Hedeoma oblongifolia | Oblongleaf False Pennyroyal Oblong-leaf False Pennyroyal False Pennyroyal Falsepennyroyal | |
| Hedeoma pilosa | Old Blue False Pennyroyal Old Blue Mountain False Pennyroyal Falsepennyroyal | |
| Hedeoma plicata | Veiny False Pennyroyal | |
| Hedeoma pulcherrima | White Mountain False Pennyroyal Beautiful Pennyroyal Mescalero Pennyroyal | |
| Hedeoma pulegioides | American False Pennyroyal | |
| Hedeoma reverchonii | Reverchon's False Pennyroyal | |
| Hedeoma reverchonii var. reverchonii | Reverchon's False Pennyroyal Rock Hedeoma | |
| Hedeoma reverchonii var. serpyllifolia | Reverchon's False Pennyroyal Rock Hedeoma | |
| Hedeoma todsenii | Todsen's False Pennyroyal Todsen's Pennyroyal | |
| Hedosyne ambrosiifolia | Ragged Marsh-Elder | |
| Hedyotis acuminata | Au Pilo | |
| Hedyotis centranthoides | Forest Starviolet Manono | |
| Hedyotis cookiana | 'Awiwi | |
| Hedyotis coriacea | Kio'ele | |
| Hedyotis degeneri | Waianae Range Starviolet | |
| Hedyotis degeneri var. coprosmifolia | Waianae Range Starviolet | |
| Hedyotis degeneri var. degeneri | Waianae Range Starviolet | |
| Hedyotis elatior | 'Uiwi Awiwi | |
| Hedyotis fluviatilis | Kamapua'a Pilo | |
| Hedyotis flynnii | Cliff-dwelling Starviolet | |
| Hedyotis foggiana | Kauai Starviolet | |
| Hedyotis foliosa | Haleakala Starviolet | |
| Hedyotis formosa | Maui Starviolet | |
| Hedyotis fosbergii | Fosberg's Starviolet Manono | |
| Hedyotis greenei | Greene's Starviolet Greene's Star-violet | |
| Hedyotis hillebrandii | Manono | |
| Hedyotis intricata | Tangled Starviolet | |
| Hedyotis knudsenii | Kokee Starviolet Manono | |
| Hedyotis littoralis | Seacliff Starviolet Manono | |
| Hedyotis mannii | Pilo | |
| Hedyotis parvula | Rockface Starviolet | |
| Hedyotis schlechtendahliana | Kopa | |
| Hedyotis schlechtendahliana ssp. remyi | Kopa | |
| Hedyotis schlechtendahliana ssp. schlechtendahliana | Kopa | |
| scientific name | common name(s) | image gallery |
