Complete list of species
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| scientific name | common name(s) | image gallery |
| Hypolepis repens | Bramble Fern Creeping Bramble Fern Flakelet Fern | |
| Hypoxis curtissii | Curtis' Star-grass | |
| Hypoxis hirsuta | Common Goldstar Yellow Star-grass Eastern Yellow Star-grass | |
| Hypoxis juncea | Fringed Yellow Star-grass Common Star-grass | |
| Hypoxis mexicana | Mexican Yellow Star-grass Yellow Star Grass | |
| Hypoxis rigida | Savannah Star Grass Stiff Star Grass Stiff Star-grass Yellow Star Grass | |
| Hypoxis sessilis | Glossyseed Yellow Star Grass Glossyseed Yellow Star-grass Yellow Star Grass | |
| Hypoxis wrightii | Wright's Star-grass | |
| Hyptis alata | Clustered Bushmint | |
| Hyptis emoryi | Desert Lavender | |
| Ibervillea lindheimeri | Balsam Gourd Lindheimer's Globeberry Globe Berry Snake-apple Balsam-apple | |
| Ibervillea tenuisecta | Slimlobe Globeberry Cutleaf Globe Berry | |
| Idahoa scapigera | Oldstem Idahoa Flatpod | |
| Ilex ambigua | Carolina Holly Sand Holly Possum Holly | |
| Ilex amelanchier | Sarvis Holly Swamp Holly | |
| Ilex anomala | Aiea Hawaii Holly Hawaiian Holly Kawau | |
| Ilex cassine | Dahoon | |
| Ilex cassine var. cassine | Dahoon Dahoon Holly | |
| Ilex cassine var. latifolia | Dahoon | |
| Ilex collina | Longstalk Holly Hill Holly | |
| Ilex coriacea | Baygall Bush Large Gallberry Gallberry Tall Inkberry Holly Inkberry Holly Shining Inkberry Inkberry | |
| Ilex cuthbertii | Cuthbert's Holly Cuthbert Holly | |
| Ilex decidua | Possumhaw Possumhaw Holly Deciduous Holly Meadow Holly Prairie Holly Swamp Holly Welk Holly Deciduous Yaupon Bearberry Winterberry | |
| Ilex glabra | Inkberry Gallberry | |
| Ilex krugiana | Krug's holly Tawny-berry Holly Tawnyberry Holly | |
| Ilex laevigata | Smooth Winterberry | |
| Ilex longipes | Chapman Holly Georgia Holly | |
| Ilex montana | Mountain Holly Mountain Winterberry | |
| Ilex mucronata | Catberry | |
| Ilex myrtifolia | Myrtle Dahoon Myrtle Leaf Holly Myrtle Holly | |
| Ilex opaca | American Holly White Holly Prickly Holly Evergreen Holly Christmas Holly Yule Holly | |
| Ilex opaca var. arenicola | American Holly Dune Holly Scrub Holly | |
| Ilex opaca var. opaca | American Holly Christmas Holly Evergreen Holly Prickly Holly White Holly Yule Holly | |
| Ilex verticillata | Common Winterberry Winterberry Michigan Holly Black Alder | |
| Ilex vomitoria | Yaupon Yaupon Holly Cassina | |
| Ilex ×attenuata | East Palatka Holly Topal Holly | |
| Iliamna bakeri | Baker's Globe Mallow Baker's Wild Hollyhock Baker’s Globemallow | |
| Iliamna crandallii | Crandall's Globe Mallow Crandall's Wild Hollyhock | |
| Iliamna grandiflora | Largeflower Wild Hollyhock | |
| Iliamna latibracteata | California Globe Mallow California Wild Hollyhock | |
| Iliamna longisepala | Long-sepal Globemallow Long-sepal Wild Hollyhock Longsepal Globemallow Longsepal Wild Hollyhock | |
| Iliamna rivularis | Streambank Wild Hollyhock Wild Hollyhock Mountain Globemallow | |
| Iliamna rivularis var. diversa | Streambank Globe-mallow Streambank Wild Hollyhock | |
| Iliamna rivularis var. rivularis | Kankakee Globe-mallow Kankakee Mallow Peter's Mountain Mallow Streambank Globe-mallow Streambank Wild Hollyhock | |
| Illicium floridanum | Florida Anisetree Florida Anise Anise Tree Stinkbush | |
| Illicium parviflorum | Yellow Anisetree Small Anisetree Star Anise | |
| Impatiens aurella | Paleyellow Touch-me-not Varied Jewelweed | |
| Impatiens capensis | Jewelweed Orange Jewelweed Spotted Touch-me-not | |
| Impatiens ecornuta | Spurless Touch-me-not | |
| Impatiens noli-tangere | Western Touch-me-not | |
| Impatiens pallida | Pale Touch-me-not Yellow Jewelweed | |
| Imperata brevifolia | California Satintail | |
| Indigofera caroliniana | Carolina Indigo | |
| Indigofera lindheimeriana | Lindheimer's Indigo | |
| Indigofera miniata | Scarlet Pea Coastal Indigo Texas Indigo Western Indigo | |
| Indigofera oxycarpa | Asian Indigo | |
| Indigofera sphaerocarpa | Sonoran Indigo | |
| Indigofera suffruticosa | Anil De Pasto | |
| Iodanthus pinnatifidus | Purplerocket Purple Rocket Purple-rocket Violet-rocket | |
| Ionactis alpina | Lava Ankle-aster Lava Aster | |
| Ionactis caelestis | Spring Mountain Ankle-aster Spring Mountain Aster | |
| Ionactis elegans | Sierra Blanca Ankle-aster Sierra Blanca Least-Daisy | |
| Ionactis linariifolius | Flaxleaf Whitetop Aster Stiff Aster Flaxleaf Aster | |
| Ionactis stenomeres | Rocky Mountain Ankle-aster Rocky Mountain Aster | |
| Ionopsis utricularioides | Delicate Ionopsis Delicate Violet Orchid | |
| Ipomoea alba | Moonflower Moon Vine Tropical White Morning Glory | |
| Ipomoea barbatisepala | Canyon Morning-glory Canyon Morning Glory Canyon Morningglory | |
| Ipomoea capillacea | Purple Morning-glory Purple Morning Glory Purple Morningglory | |
| Ipomoea cardiophylla | Heartleaf Morning-glory | |
| Ipomoea cordatotriloba | Tievine Purple Bindweed Morning Glory | |
| Ipomoea cordatotriloba var. cordatotriloba | Tievine Sharp-pod Morning Glory Purple Bindweed Tie Vine | |
| Ipomoea cordatotriloba var. torreyana | Torrey's Tievine | |
| Ipomoea costellata | Crestrib Morning-glory Crest-rib Morning-glory Crested Morning-glory | |
| Ipomoea costellata var. edwardsensis | Edwards Plateau Crestrib Morning-glory Edwards Plateau Crest-rib Morning-glory Edwards Plateau Crested Morning-glory | |
| Ipomoea cristulata | Transpecos Morning-glory Scarlet Creeper Trans-Pecos Morning Glory | |
| Ipomoea dumetorum | Railwaycreeper Railway-creeper | |
| Ipomoea hederifolia | Scarlet Creeper | |
| Ipomoea imperati | Beach Morning-glory Beach Morning Glory | |
| Ipomoea lacunosa | Whitestar White Morning-glory Pitted Morningglory Small White Morning Glory | |
| Ipomoea leptophylla | Bush Morning-glory | |
| Ipomoea lindheimeri | Lindheimer's Morning-glory Blue Morning Glory | |
| Ipomoea littoralis | Whiteflower Beach Morning-glory White-flower Beach Morning-glory Beach Morning Glory Hunakai | |
| Ipomoea longifolia | Pinkthroat Morning-glory Pinkthroat Morning Glory Pinkthroat Morningglory Pink-throat Morning-glory Longleaf Morning Glory | |
| Ipomoea macrorhiza | Largeroot Morning-glory Large Root Morning Glory Large-root Morning-glory Largeroot Morningglory Pink Moonvine | |
| Ipomoea microdactyla | Calcareous Morning-glory Limestone Morning-glory Man-in-the-ground Wild Potato Morning-glory Wild Potato Morning Glory Wild-potato Morning-glory Bejuco Colorado | |
| Ipomoea pandurata | Man Of The Earth Wild Potato Wild Sweet Potato Manroot | |
| Ipomoea pes-caprae | Railroad Vine Goat-foot Morning Glory Bayhops Beach Morning Glory | |
| Ipomoea pes-caprae ssp. brasiliensis | Railroad Vine Brazilian Bayhops Goat's-foot Morning-glory | |
| Ipomoea plummerae | Huachuca Mountain Morning-glory Huachuca Mountain Morning Glory Huachuca Morningglory Plummer's Morning Glory | |
| Ipomoea pubescens | Silky Morning-glory Morning Glory Morningglory | |
| Ipomoea rupicola | Cliff Morning-glory Cliff Morning Glory Cliff Morningglory | |
| Ipomoea sagittata | Saltmarsh Morning-glory Salt-marsh Morning Glory | |
| Ipomoea shumardiana | Narrowleaf Morning-glory Narrow-leaf Morning-glory Narrowleaf Morningglory Narrow Leaf Morning Glory | |
| Ipomoea tenuiloba | Spiderleaf | |
| Ipomoea tenuiloba var. lemmonii | Spiderleaf Lemmon's Morning-glory Lemmon's Morning Glory | |
| Ipomoea tenuiloba var. tenuiloba | Spiderleaf | |
| Ipomoea tenuissima | Rockland Morning-glory Rockland Morning Glory Rocklands Morning-glory | |
| Ipomoea ternifolia | Tripleleaf Morning-glory Tripleleaf Morning Glory Three-leaf Morning-glory | |
| Ipomoea ternifolia var. leptotoma | Tripleleaf Morning-glory Tripleleaf Morning Glory Three-leaf Morning-glory | |
| Ipomoea thurberi | Thurber's Morning-glory Thurber's Morning Glory Thurber Morningglory | |
| scientific name | common name(s) | image gallery |
