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