Complete list of species
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| scientific name | common name(s) | image gallery |
| Horkelia cuneata ssp. cuneata | Wedge Leaved Horkelia Wedgeleaf Horkelia | |
| Horkelia cuneata ssp. puberula | Mesa Horkelia Wedgeleaf Horkelia | |
| Horkelia cuneata ssp. sericea | Coast Horkelia Kellogg’s Horkelia Wedgeleaf Horkelia | |
| Horkelia daucifolia | Carrot Leafed Horkelia Carrotleaf Horkelia | |
| Horkelia daucifolia ssp. daucifolia | Carrot Leafed Horkelia Carrotleaf Horkelia | |
| Horkelia daucifolia ssp. latior | Carrot Leafed Horkelia Carrotleaf Horkelia | |
| Horkelia fusca | Pinewoods Horkelia | |
| Horkelia fusca ssp. capitata | Bighead Horkelia Palouse Horkelia | |
| Horkelia fusca ssp. filicoides | Diamond Lake Horkelia Pinewoods Horkelia | |
| Horkelia fusca ssp. fusca | Dusky Horkelia Pinewoods Horkelia | |
| Horkelia fusca ssp. parviflora | Small-flowered Horkelia Smallflower Horkelia Tawny Horkelia | |
| Horkelia fusca ssp. pseudocapitata | Littlehead Horkelia Intermountain Horkelia | |
| Horkelia fusca ssp. tenella | Delicate Horkelia Pinewoods Horkelia Tawny Horkelia | |
| Horkelia hendersonii | Henderson's Horkelia | |
| Horkelia hispidula | White Mountain Horkelia White Mountains Horkelia | |
| Horkelia marinensis | Point Reyes Horkelia | |
| Horkelia parryi | Chamise Horkelia Parry Horkelia Parry’s Horkelia | |
| Horkelia rydbergii | Rydberg's Horkelia | |
| Horkelia sericata | Howell's Horkelia Silky Horkelia | |
| Horkelia tenuiloba | Santa Rosa Horkelia Sonoma Horkelia Thin Lobed Horkelia Thin-lobed Horkelia | |
| Horkelia tridentata | Three Toothed Horkelia Threetooth Horkelia | |
| Horkelia tridentata ssp. flavescens | Hairycup Horkelia Three Toothed Horkelia Threetooth Horkelia | |
| Horkelia tridentata ssp. tridentata | Sierra Horkelia Three Toothed Horkelia Threetooth Horkelia | |
| Horkelia truncata | Ramona Horkelia | |
| Horkelia tularensis | Kern Plateau Horkelia Tulare Cinquefoil | |
| Horkelia wilderae | Barton Flats Horkelia Wilder’s Horkelia | |
| Horkelia yadonii | Santa Lucia Horkelia Yadon’s Horkelia | |
| Horkeliella congdonis | Congdon's False Horkelia Congdon's Little Horkelia Congdon’s Horkeliella | |
| Horkeliella purpurascens | Kern Plateau Horkeliella Purple False Horkelia Purple Horkelia | |
| Horsfordia alata | Big Feltplant Pink Felt Plant Pink Velvet Mallow Pink Velvet-mallow Pink Velvetmallow | |
| Horsfordia newberryi | Newberry's Velvet Mallow Newberry's Velvet-mallow Newberry's Velvetmallow Orange Velvet Mallow Yellow Felt Plant Yellow Feltplant | |
| Hottonia inflata | American Featherfoil Featherfoil | |
| Houstonia acerosa | Needleleaf Bluet | |
| Houstonia acerosa var. acerosa | Needleleaf Bluet | |
| Houstonia acerosa var. polypremoides | Needleleaf Bluet | |
| Houstonia caerulea | Azure Bluet Quaker Ladies Bluets | |
| Houstonia canadensis | Canadian Summer Bluet | |
| Houstonia correllii | Correll's Bluet Zapata County Bluet | |
| Houstonia croftiae | Croft's Bluet | |
| Houstonia humifusa | Matted Bluet | |
| Houstonia longifolia | Longleaf Summer Bluet Pale Bluets | |
| Houstonia micrantha | Southern Bluet | |
| Houstonia ouachitana | Ouachita Bluet | |
| Houstonia parviflora | Greenman's Bluet | |
| Houstonia procumbens | Roundleaf Bluet Round-leaf Bluets Innocence | |
| Houstonia purpurea | Venus's Pride Large Houstonia Woodland Bluets Purple Bluets Mountain Bluets | |
| Houstonia purpurea var. calycosa | Venus' Pride Purple Bluets | |
| Houstonia purpurea var. montana | Roan Mountain Bluet Venus's Pride | |
| Houstonia purpurea var. purpurea | Venus' Pride Large Purple Bluets | |
| Houstonia pusilla | Tiny Bluets Small Bluets Star Violet | |
| Houstonia rosea | Rose Bluet | |
| Houstonia rubra | Red Bluet | |
| Houstonia serpyllifolia | Thymeleaf Bluet | |
| Houstonia subviscosa | Nodding Bluet | |
| Houstonia wrightii | Pygmy Bluet | |
| Howellanthus dalesianus | Scott Mountain Phacelia Scott Mountain Scorpion-weed | |
| Howellia aquatilis | Water Howellia Water Howellwort | |
| Howelliella ovata | Lionsnap Oval Leaved Snapdragon Oval-leafed Snapdragon Ovateleaf Snapdragon | |
| Hudsonia ericoides | Pine Barren Goldenheather Pinebarren Goldenheather | |
| Hudsonia montana | Mountain Golden Heather Mountain Golden-heather Mountain Goldenheather | |
| Hudsonia tomentosa | Woolly Beachheather Beach Heath | |
| Hudsonia tomentosa var. intermedia | Sand Goldenheather Hairy Hudsonia | |
| Hudsonia tomentosa var. tomentosa | Woolly Beachheather Woolly Beach-heather False Heather | |
| Hulsea algida | Pacific Hulsea Alpinegold | |
| Hulsea brevifolia | Short Leaved Hulsea Shortleaf Alpinegold | |
| Hulsea californica | San Diego Alpinegold San Diego Sunflower | |
| Hulsea heterochroma | Redray Alpinegold Redray Hulsea | |
| Hulsea mexicana | Mexican Alpinegold | |
| Hulsea nana | Dwarf Alpinegold | |
| Hulsea vestita | Pumice Alpinegold Pumice Hulsea | |
| Hulsea vestita ssp. callicarpha | Beautiful Hulsea Pumice Alpinegold | |
| Hulsea vestita ssp. gabrielensis | Pumice Alpinegold San Gabriel Mountains Sunflower | |
| Hulsea vestita ssp. inyoensis | Inyo Hulsea Pumice Alpinegold | |
| Hulsea vestita ssp. parryi | Parry's Alpinegold Parry's Sunflower | |
| Hulsea vestita ssp. pygmaea | Pygmy Alpinegold Pygmy Hulsea | |
| Hulsea vestita ssp. vestita | Pumice Alpinegold Pumice Hulsea | |
| Hulteniella integrifolia | Entire-leaved Daisy Entireleaf Daisy | |
| Humulus lupulus | Common Hop | |
| Humulus lupulus var. lupuloides | Common Hop | |
| Humulus lupulus var. neomexicanus | Common Hop Hops | |
| Humulus lupulus var. pubescens | Common Hop | |
| Hunnemannia fumariifolia | Mexican Tulip Poppy | |
| Hunzikeria texana | Texas Cupflower | |
| Huperzia appalachiana | Appalachian Firmoss Appalachian Fir-clubmoss Appalachian Clubmoss | |
| Huperzia dichotoma | Hanging Clubmoss | |
| Huperzia erosa | Toothed Clubmoss | |
| Huperzia filiformis | Stringleaf Clubmoss | |
| Huperzia haleakalae | Alpine Fir-moss Haleakala Firmoss Pacific Clubmoss Pacific Firmoss | |
| Huperzia lucidula | Shining Firmoss Shining Clubmoss | |
| Huperzia mannii | Mann's Clubmoss Wawae'iole | |
| Huperzia miyoshiana | Chinese Clubmoss Chinese Fir-moss Miyoshi's Clubmoss Pacific Firmoss | |
| Huperzia nutans | Nodding Clubmoss Wawae`iole | |
| Huperzia occidentalis | Western Clubmoss Western Fir-moss Western Firmoss | |
| Huperzia phyllantha | Daggerleaf Clubmoss Wawae`iole | |
| Huperzia polytrichoides | Treelimb Clubmoss | |
| Huperzia porophila | Rock Clubmoss | |
| Huperzia selago | Alpine Clubmoss Fir Clubmoss Mountain Clubmoss Mountain Firmoss Northern Fir-moss | |
| Huperzia selago var. densa | Alpine Clubmoss Fir Clubmoss Mountain Clubmoss Mountain Firmoss Northern Fir-moss | |
| Huperzia selago var. selago | Alpine Clubmoss Fir Clubmoss Mountain Clubmoss Mountain Firmoss Northern Fir-moss | |
| Huperzia serrata | Toothed Clubmoss Toothed Fir-moss | |
| scientific name | common name(s) | image gallery |
