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 | |
| scientific name | common name(s) | image gallery |
