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