Complete list of species
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| scientific name | common name(s) | image gallery |
| Hemizonia congesta ssp. vernalis | Hayfield Tarweed | |
| Hemizonia fasciculata | Clustered Tarweed | |
| Hemizonia fitchii | Fitch's Spikeweed Fitch's Tarweed | |
| Hemizonia floribunda | Tecate Tarweed | |
| Hemizonia kelloggii | Kellogg's Tarweed | |
| Hemizonia lobbii | Threeray Tarweed | |
| Hemizonia paniculata | San Diego Tarweed | |
| Henrya insularis | Island Renegade | |
| Hepatica nobilis | Hepatica | |
| Hepatica nobilis var. acuta | Sharplobe Hepatica Sharp-lobed Hepatica Mountain Hepatica | |
| Hepatica nobilis var. obtusa | Roundlobe Hepatica Round-lobed Hepatica Liverleaf | |
| Heracleum maximum | Common Cowparsnip Cow Parsnip | |
| Herbertia lahue | Prairie Nymph Herbertia | |
| Herbertia lahue ssp. caerulea | Prairie Nymph Herbertia | |
| Herissantia crispa | Bladder Mallow Bladder-mallow Bladdermallow Curly Herissantia | |
| Hermannia pauciflora | Hierba del Soldado Santa Catalina Burstwort | |
| Hermannia texana | Texas Burstwort Mexican Mallow | |
| Hesperaloe funifera | Giant Hesperaloe New Mexico False Yucca Samandoce | |
| Hesperaloe parviflora | Red Yucca Coral Yucca Red-flowered False Yucca Redflower False Yucca Yellow Yucca Hummingbird Yucca Samandoque | |
| Hesperaloe parviflora var. engelmannii | Engelmann's False Yucca Red Hesperaloe Red Yucca | |
| Hesperaloe parviflora var. parviflora | Red Hesperaloe Red Yucca Redflower False Yucca | |
| Hesperevax acaulis | Dwarf Evax Stemless Dwarf Cudweed Stemless Dwarf-Cudweed | |
| Hesperevax acaulis var. acaulis | Stemless Dwarf Cudweed Stemless Dwarf-Cudweed Stemless Evax | |
| Hesperevax acaulis var. ambusticola | Fire Evax Stemless Dwarf Cudweed Stemless Dwarf-Cudweed | |
| Hesperevax acaulis var. robustior | Big Evax Robust Evax Stemless Dwarf Cudweed Stemless Dwarf-Cudweed | |
| Hesperevax caulescens | Dwarf Dwarf Cudweed Dwarf Dwarf-Cudweed Hogwallow Starfish | |
| Hesperevax sparsiflora | Erect Dwarf Cudweed Erect Dwarf-Cudweed Erect Evax Few Flowered Evax | |
| Hesperevax sparsiflora var. brevifolia | Seaside Evax Short-leaved Evax Shortleaf Dwarf-Cudweed | |
| Hesperevax sparsiflora var. sparsiflora | Erect Dwarf Cudweed Erect Dwarf-Cudweed Few Flowered Evax | |
| Hesperocallis undulata | Desert Lily Desert-lily Ajo Lily | |
| Hesperochiron californicus | California Hesperochiron | |
| Hesperochiron pumilus | Dwarf Hesperochiron | |
| Hesperocnide sandwicensis | Hawaii Stinging-nettle Hawaii Stingingnettle | |
| Hesperocnide tenella | Western Nettle Western Stinging Nettle Western Stinging-nettle Western Stingingnettle | |
| Hesperocyparis abramsiana | Santa Cruz Cypress | |
| Hesperocyparis abramsiana var. abramsiana | Santa Cruz Cypress | |
| Hesperocyparis abramsiana var. butanoensis | Santa Cruz Cypress | |
| Hesperocyparis arizonica | Arizona Cypress Cedro Blanco | |
| Hesperocyparis bakeri | Modoc Cypress Baker Cypress | |
| Hesperocyparis forbesii | Tecate Cypress | |
| Hesperocyparis glabra | Arizona Cypress Cuyamaca Cypress Piute Cypress Smooth Arizona Cypress | |
| Hesperocyparis goveniana | Gowen Cypress | |
| Hesperocyparis macnabiana | Macnab's Cypress | |
| Hesperocyparis macrocarpa | Monterey Cypress | |
| Hesperocyparis nevadensis | Paiute Cypress Piute Cypress | |
| Hesperocyparis pigmaea | Pygmy Cypress | |
| Hesperocyparis sargentii | Sargent Cypress Sargent's Cypress | |
| Hesperocyparis stephensonii | Cuyamaca Cypress | |
| Hesperodoria salicina | Willow Glowweed | |
| Hesperodoria scopulorum | Evening-daisy Grand Canyon Glowweed | |
| scientific name | common name(s) | image gallery |
