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