Complete list of species
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| scientific name | common name(s) | image gallery |
| Isoetes lithophila | Rock Quillwort | |
| Isoetes louisianensis | Louisiana Quillwort | |
| Isoetes macrospora | Big-spore Quillwort Large-spored Quillwort | |
| Isoetes maritima | Coastal Quillwort Maritime Quillwort | |
| Isoetes mattaponica | Mattaponi Quillwort | |
| Isoetes melanopoda | Blackfoot Quillwort | |
| Isoetes melanopoda ssp. silvatica | Swamp Forest Blackfoot Quillwort | |
| Isoetes melanospora | Blackspore Quillwort | |
| Isoetes microvela | Thin-wall Quillwort | |
| Isoetes minima | Midget Quillwort | |
| Isoetes nuttallii | Nuttall's Quillwort | |
| Isoetes occidentalis | Western Quillwort | |
| Isoetes orcuttii | Orcutt's Quillwort | |
| Isoetes piedmontana | Piedmont Quillwort | |
| Isoetes prototypus | Prototype Quillwort Spike Quillwort Spiked Quillwort | |
| Isoetes riparia | River Bank Quillwort River Quillwort Shore Quillwort | |
| Isoetes riparia var. amesii | Ames' Quillwort River Bank Quillwort River Quillwort | |
| Isoetes riparia var. riparia | River Bank Quillwort River Quillwort Shore Quillwort | |
| Isoetes saccharata | Sugar Quillwort Sugary Quillwort | |
| Isoetes tegetiformans | Merlin's-grass | |
| Isoetes tenella | Spiny-spore Quillwort | |
| Isoetes tennesseensis | Tennessee Quillwort | |
| Isoetes texana | Texas Quillwort | |
| Isoetes tuckermanii | Tuckerman's Quillwort | |
| Isoetes valida | Strong Quillwort True Quillwort | |
| Isoetes virginica | Virginia Quillwort | |
| Isoetes ×altonharvillii | Harvill's Quillwort Quillwort | |
| Isoetes ×brittonii | Britton's Quillwort Quillwort | |
| Isoetes ×bruntonii | Quillwort Brunton's Quillwort | |
| Isoetes ×carltaylorii | Taylor's Quillwort | |
| Isoetes ×dodgei | Dodge's Quillwort Quillwort | |
| Isoetes ×eatonii | Eaton's Quillwort Quillwort | |
| Isoetes ×echtuckeri | Hybrid Quillwort Quillwort | |
| Isoetes ×fairbrothersii | Quillwort | |
| Isoetes ×foveolata | Pitted Quillwort Quillwort | |
| Isoetes ×harveyi | Harvey's Quillwort Quillwort | |
| Isoetes ×herb-wagneri | Quillwort | |
| Isoetes ×heterospora | Quillwort | |
| Isoetes ×hickeyi | Hickey's Quillwort Quillwort | |
| Isoetes ×jeffreyi | Jeffrey's Quillwort Quillwort | |
| Isoetes ×novae-angliae | New England Quillwort | |
| Isoetes ×pseudotruncata | False Truncated Quillwort Quillwort | |
| Isoetes ×truncata | Quillwort Slashed Quillwort Truncated Quillwort | |
| Isolepis carinata | Keeled Bulrush | |
| Isolepis cernua | Low Bulrush Low Lateral-bulrush | |
| Isolepis molesta | Gulf Coast Bulrush | |
| Isotria medeoloides | Small Whorled Pogonia Green Fiveleaf Orchid | |
| Isotria verticillata | Large Whorled Pogonia Purple Fiveleaf Orchid | |
| Itea virginica | Virginia Sweetspire Tassel-white Virginia Willow | |
| Iva angustifolia | Narrowleaf Marshelder Narrow-leaf Sumpweed Narrowleaf Marsh Elder | |
| scientific name | common name(s) | image gallery |
