Complete list of species
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| scientific name | common name(s) | image gallery |
| Hedyotis schlechtendahliana ssp. waimeae | Kopa | |
| Hedyotis st.-johnii | Napali Beach Starviolet Na Pali Beach Hedyotis | |
| Hedyotis terminalis | Variable Starviolet Manono | |
| Hedyotis tryblium | Kalalau Valley Starviolet | |
| Hedyotis vegrandis | New Mexico Starviolet Little Star-violet | |
| Hedysarum alpinum | Alpine Sweetvetch Alpine Sweet Broom Licorice Root Sweetbroom | |
| Hedysarum boreale | Utah Sweetvetch Boreal Sweet-vetch Northern Sweetvetch | |
| Hedysarum boreale ssp. boreale | Utah Sweetvetch | |
| Hedysarum boreale ssp. mackenziei | Northern Sweetvetch Boreal Sweetvetch | |
| Hedysarum boreale var. boreale | Utah Sweetvetch | |
| Hedysarum boreale var. gremiale | Utah Sweetvetch | |
| Hedysarum occidentale | Western Sweetvetch Western Sweet-vetch | |
| Hedysarum occidentale var. canone | Western Sweetvetch | |
| Hedysarum occidentale var. occidentale | Western Sweetvetch | |
| Hedysarum sulphurescens | White Sweetvetch | |
| Heimia salicifolia | Shrubby Yellowcrest | |
| Helenium amarum | Yellow Sneezeweed Bitterweed Yellow Bitterweed Yellowdicks Slender-leaved Sneezeweed Fine-leaved Sneezweed Yellow Dog-fennel | |
| Helenium amarum var. amarum | Yellow Bitterweed Yellowdicks | |
| Helenium amarum var. badium | Brown Bitterweed Basin Sneezeweed | |
| Helenium arizonicum | Arizona Sneezeweed | |
| Helenium autumnale | Common Sneezeweed Fall Sneezeweed Autumn Sneezeweed | |
| Helenium autumnale var. autumnale | Common Sneezeweed | |
| Helenium autumnale var. grandiflorum | Common Sneezeweed Fall Sneezeweed | |
| Helenium autumnale var. montanum | Mountain Sneezeweed | |
| Helenium bigelovii | Bigelow's Sneezeweed | |
| Helenium bolanderi | Coastal Sneezeweed | |
| Helenium brevifolium | Shortleaf Sneezeweed | |
| Helenium campestre | Oldfield Sneezeweed | |
| Helenium drummondii | Fringed Sneezeweed | |
| Helenium elegans | Pretty Sneezeweed | |
| Helenium elegans var. amphilobum | Pretty Sneezeweed | |
| Helenium elegans var. elegans | Pretty Sneezeweed | |
| Helenium flexuosum | Purplehead Sneezeweed Purple-head Sneezeweed | |
| Helenium linifolium | Slimleaf Sneezeweed | |
| Helenium microcephalum | Smallhead Sneezeweed | |
| Helenium microcephalum var. microcephalum | Smallhead Sneezeweed | |
| Helenium microcephalum var. ooclinium | Smallhead Sneezeweed | |
| Helenium pinnatifidum | Southeastern Sneezeweed | |
| Helenium puberulum | Rosilla | |
| Helenium quadridentatum | Longdisk Sneezeweed Sneezeweed | |
| Helenium thurberi | Thurber's Sneezeweed | |
| Helenium vernale | Savanna Sneezeweed | |
| Helenium virginicum | Virginia Sneezeweed | |
| Helenium ×polyphyllum | Sneezeweed | |
| Helianthella californica | California Helianthella | |
| Helianthella californica ssp. californica | California Helianthella | |
| Helianthella californica ssp. nevadensis | Nevada Helianthella | |
| Helianthella californica ssp. shastensis | Shasta Helianthella | |
| Helianthella castanea | Mt. Diablo Helianthella | |
| Helianthella microcephala | Purpledisk Helianthella | |
| Helianthella parryi | Parry's Dwarf-Sunflower | |
| Helianthella quinquenervis | Fivenerve Helianthella | |
| Helianthella uniflora | Oneflower Helianthella | |
| Helianthella uniflora var. douglasii | Douglas' Helianthella | |
| Helianthella uniflora var. uniflora | Oneflower Helianthella | |
| Helianthemum arenicola | Coastal Sand Frostweed Dune Rock Rose | |
| Helianthemum bicknellii | Hoary Frostweed Bicknell's Hoary Rock-rose Bicknell's Rock-rose Plains Frostweed | |
| Helianthemum canadense | Longbranch Frostweed Frostweed Rock Frost Frostplant Frostwort | |
| Helianthemum carolinianum | Carolina Frostweed | |
| Helianthemum corymbosum | Pine Barren Frostweed Clustered Rock-rose | |
| Helianthemum dumosum | Bushy Frostweed Bushy Rockrose Bushy Rush-rose | |
| Helianthemum georgianum | Georgia Frostweed Rockrose Georgia Sunrose | |
| Helianthemum glomeratum | Clustered Frostweed | |
| Helianthemum greenei | Island Rush-rose Island Rushrose | |
| Helianthemum nashii | Florida Scrub Frostweed Florida Scrub Sunrose | |
| Helianthemum propinquum | Creeping Frostweed Low Frostweed | |
| Helianthemum rosmarinifolium | Rosemary Frostweed Sun Rose | |
| Helianthemum scoparium | Bisbee Peak Rushrose Peak Rush-rose | |
| Helianthus agrestis | Southeastern Sunflower | |
| Helianthus angustifolius | Swamp Sunflower Narrowleaf Sunflower Narrow-leaved Sunflower | |
| Helianthus annuus | Common Sunflower Annual Sunflower | |
| Helianthus anomalus | Western Sunflower | |
| Helianthus argophyllus | Silverleaf Sunflower | |
| Helianthus arizonensis | Arizona Sunflower | |
| Helianthus atrorubens | Purpledisk Sunflower | |
| Helianthus bolanderi | Bolander’s Sunflower Serpentine Sunflower | |
| Helianthus californicus | California Sunflower | |
| Helianthus carnosus | Lakeside Sunflower | |
| Helianthus ciliaris | Texas Blueweed | |
| Helianthus cusickii | Cusick's Sunflower | |
| Helianthus debilis | Cucumberleaf Sunflower Cucumber-leaf Sunflower Beach Sunflower | |
| Helianthus debilis ssp. cucumerifolius | Cucumberleaf Sunflower | |
| Helianthus debilis ssp. debilis | Beach Sunflower Cucumberleaf Sunflower | |
| Helianthus debilis ssp. silvestris | Cucumberleaf Sunflower | |
| Helianthus debilis ssp. tardiflorus | Cucumberleaf Sunflower | |
| Helianthus debilis ssp. vestitus | Cucumberleaf Sunflower | |
| Helianthus decapetalus | Thinleaf Sunflower Ten-petaled Sunflower Thin-leaved Sunflower Pale Sunflower | |
| Helianthus divaricatus | Woodland Sunflower Rough Sunflower | |
| Helianthus eggertii | Eggert's Sunflower | |
| Helianthus floridanus | Florida Sunflower | |
| Helianthus giganteus | Giant Sunflower | |
| Helianthus glaucophyllus | Whiteleaf Sunflower | |
| Helianthus gracilentus | Slender Sunflower | |
| Helianthus grosseserratus | Sawtooth Sunflower | |
| Helianthus heterophyllus | Variableleaf Sunflower Wetland Sunflower | |
| Helianthus hirsutus | Hairy Sunflower Rough Sunflower | |
| Helianthus laciniatus | Alkali Sunflower | |
| Helianthus laevigatus | Smooth Sunflower | |
| Helianthus longifolius | Longleaf Sunflower | |
| Helianthus maximiliani | Maximilian Sunflower Max Sunflower | |
| scientific name | common name(s) | image gallery |
