Complete list of species
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| scientific name | common name(s) | image gallery |
| Iris verna var. verna | Dwarf Violet Iris | |
| Iris versicolor | Harlequin Blueflag Northern Blue Flag Large Blue Iris | |
| Iris virginica | Virginia Iris Great Blue Flag Southern Blue Flag | |
| Iris virginica var. shrevei | Shreve's Iris Virginia Iris Southern Blue Flag Blue Flag | |
| Iris virginica var. virginica | Virginia Iris Blue Flag Iris | |
| Iris ×nelsonii | Abbeville Iris | |
| Iris ×robusta | Blue Flag Iris Iris | |
| Iris ×sancti-cyrii | Anticosti Iris Saint-cyr Iris Sanctimonious Iris | |
| Isachne distichophylla | Ridgetop Bloodgrass 'Ohe Ridgetop Blood Grass | |
| Isachne pallens | Kauai Blood Grass Kauai Bloodgrass | |
| Ischaemum byrone | Hilo Beach Grass Hilo Murainagrass | |
| Isocoma acradenia | Alkali Goldenbush Alkali Jimmyweed Desert Isocoma | |
| Isocoma acradenia var. acradenia | Alkali Goldenbush Pale-leaf Goldenweed | |
| Isocoma acradenia var. bracteosa | Alkali Goldenbush Bracted Alkali Goldenbush | |
| Isocoma acradenia var. eremophila | Alkali Goldenbush Solitary Leaved Alkali Goldenbush | |
| Isocoma arguta | Carquinez Goldenbush Contra Costa Jimmyweed Suisun Goldenbush | |
| Isocoma azteca | Apache Jimmyweed Aztec Goldenbush | |
| Isocoma coronopifolia | Common Goldenbush Common Jimmyweed | |
| Isocoma drummondii | Drummond's Goldenbush | |
| Isocoma humilis | Zion Goldenbush Zion Jimmyweed | |
| Isocoma menziesii | Menzies' Goldenbush Pacific Jimmyweed White Flowered Goldenbush | |
| Isocoma menziesii var. decumbens | Decumbent Goldenbush Menzies' Goldenbush | |
| Isocoma menziesii var. diabolica | Menzies' Goldenbush Satan's Goldenbush | |
| Isocoma menziesii var. menziesii | Menzies' Goldenbush | |
| Isocoma menziesii var. sedoides | Menzies' Goldenbush Prostrate Coastal Goldenbush White Flowered Dune Goldenbush | |
| Isocoma menziesii var. vernonioides | Coastal Goldenbush Green Leaved Dune Goldenbush Menzies' Goldenbush | |
| Isocoma pluriflora | Southern Goldenbush Jimmyweed | |
| Isocoma rusbyi | Rusby's Goldenbush Rusby’s Jimmyweed | |
| Isocoma tenuisecta | Burroweed Shrine Jimmyweed | |
| Isodendrion hosakae | Cindercone Isodendrion | |
| Isodendrion laurifolium | Rockcliff Isodendrion | |
| Isodendrion longifolium | Longleaf Isodendrion | |
| Isodendrion pyrifolium | Wahine Noho Kula | |
| Isoetes acadiensis | Acadian Quillwort | |
| Isoetes appalachiana | Appalachian Quillwort | |
| Isoetes bolanderi | Bolander Quillwort Bolander's Quillwort Pygmy Quillwort | |
| Isoetes boomii | Boom's Quillwort | |
| Isoetes butleri | Limestone Quillwort Glade Quillwort Butler's Quillwort | |
| Isoetes engelmannii | Engelmann's Quillwort Appalachian Quillwort | |
| Isoetes flaccida | Southern Quillwort | |
| Isoetes flaccida var. alata | Florida Quillwort Southern Quillwort | |
| Isoetes flaccida var. chapmanii | Chapman's Quillwort Florida Quillwort | |
| Isoetes flaccida var. flaccida | Florida Quillwort Southern Quillwort | |
| Isoetes georgiana | Georgia Quillwort | |
| Isoetes graniticola | Flat Rock Quillwort | |
| Isoetes hawaiiensis | Hawaii Quillwort | |
| Isoetes howellii | Howell's Quillwort | |
| Isoetes hyemalis | Evergreen Quillwort Winter Quillwort Wintergreen Quillwort | |
| Isoetes junciformis | Rush Quillwort | |
| Isoetes lacustris | Lake Quillwort Merlin's-grass | |
| 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 |
