Complete list of species
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| scientific name | common name(s) | image gallery |
| Hackelia diffusa var. cottonii | Cotton's Stickseed | |
| Hackelia diffusa var. diffusa | Spreading Stickseed Diffuse Stickseed Sagebrush Stickseed | |
| Hackelia floribunda | Manyflower Stickseed Many-flower Stickseed | |
| Hackelia gracilenta | Mesa Verde Stickseed | |
| Hackelia hirsuta | New Mexico Stickseed | |
| Hackelia hispida | Showy Stickseed Rough Stickseed | |
| Hackelia hispida var. disjuncta | Rough Stickseed Sagebrush Stickseed | |
| Hackelia hispida var. hispida | Showy Stickseed Rough Stickseed | |
| Hackelia ibapensis | Ibapah Tickweed Deep Creek Stickseed | |
| Hackelia micrantha | Jessica Sticktight | |
| Hackelia mundula | Pink Stickseed Pink-flowered Stickseed | |
| Hackelia nervosa | Sierra Stickseed Sierran Stickseed | |
| Hackelia ophiobia | Owyhee River Stickseed Owyhee Stickseed Three Forks Stickseed | |
| Hackelia patens | Spotted Stickseed | |
| Hackelia patens var. harrisonii | Harrison's Stickseed | |
| Hackelia patens var. patens | Spotted Stickseed | |
| Hackelia pinetorum | Livermore Stickseed | |
| Hackelia pinetorum var. jonesii | Jones' Stickseed | |
| Hackelia pinetorum var. pinetorum | Livermore Stickseed | |
| Hackelia setosa | Bristly Stickseed Siskiyou Stickseed | |
| Hackelia sharsmithii | Sharsmith's Stickseed Sierra Stickseed | |
| Hackelia ursina | Chihuahuan Stickseed | |
| Hackelia ursina var. diaboli | Chihuahuan Stickseed | |
| Hackelia ursina var. pustulata | Chihuahuan Stickseed | |
| Hackelia ursina var. ursina | Chihuahuan Stickseed | |
| Hackelia velutina | Velvet Stickseed | |
| Hackelia venusta | Lesser Showy Stickseed Showy Stickseed | |
| Hackelia virginiana | Beggarslice Beggar's-lice Stickseed Sticktight Wild Comfrey Virginia Stickseed | |
| Halenia deflexa | American Spurred Gentian | |
| Halenia deflexa ssp. deflexa | American Spurred Gentian American Spurred-gentian Spurred Gentian | |
| Halenia rothrockii | Mt. Graham Spurred-gentian Mt. Graham Spurred Gentian Southwest Spurred Gentian | |
| Halesia carolina | Carolina Silverbell | |
| Halesia diptera | Two-wing Silverbell Two-winged Silverbell Silverbell American Snowdrop Tree Snowdrop Tree Snowbell Cowlicks | |
| Halesia tetraptera | Mountain Silverbell Carolina Silverbell Four-wing Silverbell Silverbell Tree | |
| Halesia tetraptera var. monticola | Mountain Silverbell | |
| Halesia tetraptera var. tetraptera | Mountain Silverbell Common Silverbell | |
| Halimolobos diffusa | Spreading Fissurewort Spreading Halimolobos | |
| Halimolobos jaegeri | Mojave Halimolobos | |
| Halimolobos mollis | Soft Fissurewort | |
| Halimolobos perplexa | Perplexed Halimolobos | |
| Halimolobos perplexa var. lemhiensis | Lemhi Halimolobos Perplexed Halimolobos | |
| Halimolobos perplexa var. perplexa | Perplexed Halimolobos | |
| Halimolobos virgata | Rod Halimolobos Slender Mouse-ear Cress Twiggy Halimolobos | |
| Halimolobos whitedii | Whited's Fissurewort | |
| Halodule wrightii | Shoalweed Shoal Grass | |
| Halophila decipiens | Caribbean Sea-grass Caribbean Seagrass Paddle Grass | |
| Halophila engelmannii | Engelmann's Sea-grass Engelmann's Seagrass Star Grass | |
| Halophila hawaiiana | Hawaii Seagrass | |
| Halophila johnsonii | Johnson's Seagrass | |
| Hamamelis ovalis | Bigleaf Witch-hazel Leonard's Witch-hazel | |
| scientific name | common name(s) | image gallery |
