Complete list of species
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| scientific name | common name(s) | image gallery |
| Triteleia lugens | Coast Range Triteleia Coast Range Triplet Lily | |
| Triteleia montana | Mountain Triteleia Sierra Triteleia Slender Brodiaea Slender Triplet Lily | |
| Triteleia peduncularis | Long Ray Brodiaea Long-ray Brodiaea Long-rayed Brodiaea Marsh Triteleia | |
| Triteleia versicolor | Pinto Triplet Lily Pinto Triteleia | |
| Triteleiopsis palmeri | Baja Lily Baja-lily Blue Sand Lily Palmer's Bajalily | |
| Triumfetta semitriloba | Sacramento Burbark Burweed Mosote Guachaporito | |
| Trixis californica | American Threefold Trixis | |
| Trixis inula | Tropical Threefold | |
| Trollius laxus | American Globeflower | |
| Trollius laxus ssp. albiflorus | American Globeflower Spreading Globeflower White Globeflower | |
| Trollius laxus ssp. laxus | American Globeflower | |
| Trollius riederianus | Kamchatka Globe-flower Kamchatka Globeflower | |
| Tropidia polystachya | Young Palm Orchid Young-palm Orchid | |
| Tropidocarpum capparideum | Alkali-pod Caper Fruited Tropidocarpum Caperfruit Tropidocarpum | |
| Tropidocarpum gracile | Dobie Pod Dobiepod Slender Keel Fruit Slender Tropidocarpum | |
| Tsuga canadensis | Eastern Hemlock | |
| Tsuga caroliniana | Carolina Hemlock | |
| Tsuga heterophylla | Western Hemlock | |
| Tsuga mertensiana | Mountain Hemlock | |
| Tsuga ×jeffreyi | Hybrid Hemlock Jeffrey Hemlock | |
| Tuctoria greenei | Awnless Spiral Grass Awnless Spiralgrass Greene's Tuctoria | |
| Tuctoria mucronata | Crampton's Tuctoria Prickly Spiral Grass Prickly Spiralgrass Solano Grass | |
| Tumamoca macdougalii | Globeberry Tumamoc Globeberry | |
| Turnera diffusa | Damiana | |
| Turnera diffusa var. aphrodisiaca | Damiana Damiana Turnera Oreganillo | |
| Turnera ulmifolia | Ramgoat Dashalong Ram Goat Dashalong | |
| Twisselmannia californica | Caper-fruited Tropidocarpum King's Gold | |
| Typha angustifolia | Narrowleaf Cattail | |
| Typha domingensis | Southern Cattail | |
| Typha latifolia | Broadleaf Cattail Common Cattail | |
| Typha ×bethulona | Cattail Cat-tail | |
| Typha ×glauca | Hybrid Cattail Hybrid Cat-tail | |
| Ulmus alata | Winged Elm Wahoo Elm Cork Elm Witch Elm | |
| Ulmus americana | American Elm White Elm Soft Elm Water Elm Common Elm | |
| Ulmus crassifolia | Cedar Elm Fall Elm Basket Elm Scrub Elm Lime Elm Texas Elm Southern Rock Elm Olmo | |
| Ulmus rubra | Slippery Elm Red Elm Gray Elm Soft Elm | |
| Ulmus serotina | September Elm Red Elm | |
| Ulmus thomasii | Rock Elm Cork Elm | |
| Umbellularia californica | California Laurel California Bay Oregon Myrtle Pepperwood | |
| Umbellularia californica var. californica | Bay Laurel California Bay California Laurel Oregon myrtle Pepperwood | |
| Umbellularia californica var. fresnensis | Bay Laurel California Bay California Laurel Bay Tree | |
| Uncinia brevicaulis | False Watermeal | |
| Uncinia uncinata | Hawaii Birdcatching Sedge | |
| Ungnadia speciosa | Mexican Buckeye Monilla | |
| Uniola paniculata | Sea Oats Seaoats | |
| Urera glabra | Hona Hopue Opuhe | |
| Urera kaalae | Opuhe | |
| Urochloa adspersa | Dominican Liverseed Grass Dominican Signalgrass | |
| Urochloa arizonica | Arizona Liverseed Grass Arizona Panicgrass Arizona Signalgrass | |
| Urochloa ciliatissima | Fringed Signalgrass | |
| Urochloa fusca | Browntop Signalgrass | |
| Urochloa platyphylla | Broadleaf Signalgrass Broad-leaf Liverseed Grass | |
| Urochloa texana | Texas Signalgrass | |
| Urtica chamaedryoides | Heart-leaf Stinging Nettle Heart-leaf Nettle Stinging Nettle | |
| Urtica dioica | Stinging Nettle | |
| Urtica dioica ssp. gracilis | California Nettle Stinging Nettle | |
| Urtica dioica ssp. holosericea | Giant Creek Nettle Hoary Nettle Mountain Nettle Stinging Nettle | |
| Urtica gracilenta | Mountain Nettle | |
| Urvillea ulmacea | Apaac | |
| Utricularia amethystina | Florida Purple Bladderwort | |
| Utricularia cornuta | Horned Bladderwort | |
| Utricularia floridana | Florida Yellow Bladderwort | |
| Utricularia foliosa | Leafy Bladderwort | |
| Utricularia geminiscapa | Hiddenfruit Bladderwort | |
| Utricularia gibba | Humped Bladderwort Bladderwort Conespur Bladderpod | |
| Utricularia inflata | Swollen Bladderwort Floating Bladderwort | |
| Utricularia intermedia | Flatleaf Bladderwort Mountain Bladderwort | |
| Utricularia juncea | Southern Bladderwort | |
| Utricularia macrorhiza | Common Bladderwort | |
| Utricularia minor | Lesser Bladderwort | |
| Utricularia ochroleuca | Yellowish White Bladderwort Dwarf Bladderwort | |
| Utricularia olivacea | Dwarf Bladderwort Dwarf White Bladderwort Piedmont Bladderwort | |
| Utricularia purpurea | Eastern Purple Bladderwort | |
| Utricularia radiata | Little Floating Bladderwort Floating Bladderwort | |
| Utricularia resupinata | Lavender Bladderwort | |
| Utricularia simulans | Fringed Bladderwort | |
| Utricularia striata | Striped Bladderwort Fibrous Bladderwort | |
| Utricularia subulata | Zigzag Bladderwort | |
| Uvularia floridana | Florida Bellwort | |
| Uvularia grandiflora | Largeflower Bellwort Large-flower Bellwort Merrybells | |
| Uvularia perfoliata | Perfoliate Bellwort Mealy Bellwort Merrybells | |
| Uvularia puberula | Mountain Bellwort | |
| Uvularia sessilifolia | Spreading Bellwort Straw Lily Wild Oats Merrybells Sessile-leaf Bellwort Sessile Bellwort | |
| Vaccinium alaskaense | Alaska Blueberry | |
| Vaccinium angustifolium | Lowbush Blueberry Late Lowbush Blueberry | |
| Vaccinium arboreum | Farkleberry Tree Sparkleberry Sparkleberry Winter Huckleberry Huckleberry | |
| Vaccinium boreale | Northern Blueberry | |
| Vaccinium caesariense | High-bush Blueberry New Jersey Blueberry | |
| Vaccinium calycinum | Ohelo Kau La'au Ohelo Kau Laau Ohelo | |
| Vaccinium cespitosum | Dwarf Bilberry Dwarf Blueberry Dwarf Huckleberry | |
| Vaccinium corymbosum | Highbush Blueberry | |
| Vaccinium crassifolium | Creeping Blueberry | |
| Vaccinium crassifolium ssp. crassifolium | Creeping Blueberry | |
| Vaccinium crassifolium ssp. sempervirens | Creeping Blueberry | |
| Vaccinium darrowii | Darrow's Blueberry Evergreen Blueberry | |
| Vaccinium deliciosum | Cascade Bilberry Cascades Blueberry | |
| Vaccinium dentatum | Ohelo Stiff-leaf Ohelo Hawaiian Blueberry Tropical Blueberry | |
| Vaccinium elliottii | Elliott's Blueberry Mayberry | |
| Vaccinium erythrocarpum | Southern Mountain Cranberry Mountain Blueberry Bearberry Dingleberry | |
| Vaccinium formosum | High-bush Blueberry Southern Blueberry | |
| scientific name | common name(s) | image gallery |
