Complete list of species
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| scientific name | common name(s) | image gallery |
| Huperzia somae | Oriental Clubmoss | |
| Huperzia stemmermanniae | Stemmermann's' Clubmoss | |
| Huperzia subintegra | Kauai Clubmoss | |
| Huperzia ×bartleyi | Bartley's Clubmoss Bartley's Firmoss Clubmoss Hybrid Rock Fir-moss | |
| Huperzia ×buttersii | Butters' Clubmoss Butters' Firmoss Clubmoss | |
| Huperzia ×carlquistii | Clubmoss | |
| Huperzia ×erubescens | Clubmoss | |
| Huperzia ×gillettii | Clubmoss | |
| Huperzia ×josephbeitelii | Beitel's Clubmoss Beitel's Firmoss Clubmoss | |
| Huperzia ×koolauensis | Clubmoss | |
| Huperzia ×medeirosii | Clubmoss | |
| Huperzia ×sulcinervia | Monarch Clubmoss | |
| Hybanthus attenuatus | Western Greenviolet | |
| Hybanthus concolor | Eastern Greenviolet Green Violet | |
| Hybanthus verticillatus | Babyslippers Nodding Green Violet Green Violet | |
| Hydrangea arborescens | Smooth Hydrangea Wild Hydrangea Sevenbark | |
| Hydrangea cinerea | Ashy Hydrangea Deam's Hydrangea Gray Hydrangea | |
| Hydrangea quercifolia | Oakleaf Hydrangea Oak-leaf Hydrangea | |
| Hydrangea radiata | Silverleaf Hydrangea | |
| Hydrastis canadensis | Goldenseal | |
| Hydrocotyle americana | American Marshpennywort Water-pennywort | |
| Hydrocotyle bonariensis | Largeleaf Pennywort Salt Pennywort | |
| Hydrocotyle prolifera | Whorled Marshpennywort | |
| Hydrocotyle ranunculoides | Floating Marshpennywort Floating Marsh-Pennywort Floating Marsh Pennywort Floating Pennyroyal | |
| Hydrocotyle umbellata | Manyflower Marsh-pennywort Many-flowered Marsh-pennywort Marsh Pennywort Water Pennywort Money Plant | |
| Hydrocotyle verticillata | Whorled Marshpennywort | |
| Hydrocotyle verticillata var. fetherstoniana | Whorled Marshpennywort Water-pennywort Saltpond Pennywort | |
| Hydrocotyle verticillata var. verticillata | Whorled Marshpennywort Water-pennywort Pennywort Money-plant | |
| Hydrolea corymbosa | Skyflower Tall Hydrolea | |
| Hydrolea ovata | Blue Waterleaf Ovate False Fiddleleaf Hairy Hydrolea | |
| Hydrolea quadrivalvis | Waterpod | |
| Hydrolea spinosa | Spiny False Fiddleleaf Prickly False Fiddleleaf Water Leaf | |
| Hydrolea uniflora | Oneflower False Fiddleleaf | |
| Hydrophyllum appendiculatum | Great Waterleaf Appendaged Waterleaf | |
| Hydrophyllum brownei | Brown's Waterleaf Arkansas Waterleaf | |
| Hydrophyllum canadense | Broad-leaved Waterleaf Broadleaf Waterleaf Bluntleaf Waterleaf Blunt-leaved Waterleaf Maple-leaf Waterleaf Maple-leaved Waterleaf Canadian Waterleaf Canada Waterleaf Fool's Seal | |
| Hydrophyllum capitatum | Ballhead Waterleaf Dwarf Waterleaf | |
| Hydrophyllum capitatum var. alpinum | Alpine Waterleaf Alpine Breeches | |
| Hydrophyllum capitatum var. capitatum | Ballhead Waterleaf | |
| Hydrophyllum capitatum var. thompsonii | Thompson's Waterleaf Ball-head Waterleaf Thompson's Ballhead Waterleaf Thompson's Wool Breeches | |
| Hydrophyllum fendleri | Fendler's Waterleaf | |
| Hydrophyllum fendleri var. albifrons | White Waterleaf Fendler's Waterleaf White Fendler's Waterleaf | |
| Hydrophyllum fendleri var. fendleri | Fendler's Waterleaf | |
| Hydrophyllum macrophyllum | Largeleaf Waterleaf Large-leaved Waterleaf | |
| Hydrophyllum occidentale | Western Waterleaf Squaw-lettuce Waterleaf | |
| Hydrophyllum tenuipes | Pacific Waterleaf | |
| Hydrophyllum virginianum | Virginia Waterleaf Eastern Waterleaf Shawnee Salad | |
| Hydrophyllum virginianum var. atranthum | Eastern Waterleaf | |
| Hydrophyllum virginianum var. virginianum | Eastern Waterleaf Virginia Waterleaf | |
| Hygrophila costata | Yerba De Hicotea Lake Hygrophila Gulf Swampweed | |
| Hygrophila lacustris | Gulf Swampweed | |
| Hylotelephium telephioides | Allegheny Stonecrop | |
| Hymenachne amplexicaulis | West Indian Marsh Grass | |
| Hymenocallis choctawensis | Choctaw Spiderlily Florida Panhandle Spider-lily | |
| Hymenocallis coronaria | Shoals Spiderlily Catawba Lily Cahaba Lily | |
| Hymenocallis crassifolia | Coastal Carolina Spider-lily Coastal Carolina Spiderlily | |
| Hymenocallis duvalensis | Dixie Spider-lily Dixie Spiderlily White Sands Spider-lily | |
| Hymenocallis franklinensis | Cow Creek Spider-lily Cow Creek Spiderlily Franklin Spiderlily | |
| Hymenocallis gholsonii | Gholson's Spider-lily Gholson's Spiderlily | |
| Hymenocallis godfreyi | Godfrey's Spiderlily Godfrey’s Spider-lily St. Mark’s Marsh Spider-lily | |
| Hymenocallis henryae | Henry's Spiderlily Mrs. Henry's Spiderlily Henry’s Spider-lily Green Spider-lily | |
| Hymenocallis henryae var. glaucifolia | Henry's Spiderlily Green Spider-lily Henry’s Spider-lily | |
| Hymenocallis henryae var. henryae | Henry's Spiderlily Green Spider-lily Henry’s Spider-lily | |
| Hymenocallis latifolia | Perfumed Spiderlily Perfumed Spider-lily | |
| Hymenocallis liriosme | Texas Spiderlily Spring Spiderlily Spiderlily Louisiana Spiderlily Western Marsh Spiderlily | |
| Hymenocallis occidentalis | Northern Spiderlily Hammock Spiderlily Summer Spiderlily Woodland Spiderlily | |
| Hymenocallis occidentalis var. eulae | Henry's Spiderlily Henry’s Spider-lily | |
| Hymenocallis occidentalis var. occidentalis | Northern Spiderlily Carolina Spiderlily | |
| Hymenocallis palmeri | Alligator Lily | |
| Hymenocallis puntagordensis | Punta Gorda Spiderlily Smallcup Spiderlily | |
| Hymenocallis pygmaea | Dwarf Spider-lily Dwarf Spiderlily | |
| Hymenocallis rotata | Streamside Spiderlily Florida Spiderlily | |
| Hymenocallis tridentata | Florida Spider-lily Florida Spiderlily | |
| Hymenoclea monogyra | Singlewhorl Burrobrush | |
| Hymenoclea salsola | Burrobrush White Burrobrush Desert Pearl | |
| Hymenoclea salsola var. fasciculata | Burrobrush | |
| Hymenoclea salsola var. pentalepis | Burrobrush Five Scaled Burrobrush | |
| Hymenoclea salsola var. salsola | Burrobrush | |
| Hymenoclea sandersonii | Sanderson's Burrobrush Sanderson's Cheesebush | |
| Hymenopappus artemisiifolius | Oldplainsman Woolly-white Old Plainsman | |
| Hymenopappus artemisiifolius var. artemisiifolius | Oldplainsman | |
| Hymenopappus artemisiifolius var. riograndensis | Oldplainsman | |
| Hymenopappus biennis | Biennial Woollywhite | |
| Hymenopappus carrizoanus | Carrizo Sands Woollywhite | |
| Hymenopappus filifolius | Fineleaf Hymenopappus | |
| Hymenopappus filifolius var. cinereus | Fineleaf Hymenopappus Fine-leaf Woolly-white | |
| Hymenopappus filifolius var. eriopodus | Fineleaf Hymenopappus Hairy Podded Columbia Cutleaf | |
| Hymenopappus filifolius var. filifolius | Fineleaf Hymenopappus | |
| Hymenopappus filifolius var. idahoensis | Idaho Hymenopappus | |
| Hymenopappus filifolius var. lugens | Columbia Cutleaf Fineleaf Hymenopappus | |
| Hymenopappus filifolius var. luteus | Fineleaf Hymenopappus | |
| Hymenopappus filifolius var. megacephalus | Fineleaf Hymenopappus Large Headed Columbia Cutleaf | |
| Hymenopappus filifolius var. nanus | Dwarf Columbia Cutleaf Fineleaf Hymenopappus | |
| Hymenopappus filifolius var. nudipes | Alpine Hymenopappus | |
| Hymenopappus filifolius var. parvulus | Fineleaf Hymenopappus | |
| Hymenopappus filifolius var. pauciflorus | Fineleaf Hymenopappus | |
| Hymenopappus filifolius var. polycephalus | Manyhead Hymenopappus | |
| Hymenopappus filifolius var. tomentosus | Finehair Hymenopappus | |
| Hymenopappus flavescens | Yellow Plainsman Collegeflower | |
| Hymenopappus flavescens var. canotomentosus | Collegeflower Yellow Woollywhite | |
| scientific name | common name(s) | image gallery |
