Complete list of species
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| scientific name | common name(s) | image gallery |
| 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 |
