Thymophylla tenuiloba Tiarella cordifolia
Tiarella cordifolia 'Dark Eyes' Tiarella cordifolia 'Ink Blot'
Tiarella cordifolia 'Oakleaf' Tiarella cordifolia 'Pink Bouquet'
Tiarella cordifolia 'Winterglow' Tiarella wherryi
Tigridia pavonia Tilia americana
Tilia americana 'Pyramidalis' Tilia americana 'Redmond'
Tillandsia usneoides Tithonia rotundifolia
Tithonia rotundifolia 'Aztec Sun' Tithonia rotundifolia 'Fiesta Del Sol'
Tithonia rotundifolia 'Sundance' Tithonia rotundifolia 'Yellow Torch'
Tofieldia glutinosa Tolmiea menziesii
Torreya taxifolia Toxicodendron diversilobum
Toxicodendron radicans Toxicodendron vernix
Tradescantia x andersoniana Tradescantia occidentalis
Tradescantia ohiensis 'Mrs. Loewer' Tradescantia pallida
Tradescantia pallida 'Purple Heart' Tradescantia sillamontana
Tradescantia spathacea Tradescantia virginiana
Tradescantia zebrina Tradescantia zebrina 'Quadricolor'
Trichostema parishii Triglochin maritima
Trillium cuneatum Trillium erectum
Trillium grandiflorum Trillium luteum
Trillium nivale Tripsacum dactyloides
Tripsacum floridana Tsuga canadensis
Tsuga canadensis 'Coles Prostrate' Tsuga canadensis 'Frosty'
Tsuga canadensis 'Jeddeloh' Tsuga canadensis 'Lewisii'
Tsuga canadensis 'Macrophylla' Tsuga canadensis 'Pendula'
Tsuga canadensis 'Sargentii' Tsuga caroliniana
Tsuga heterophylla Tsuga mertensiana
Turnera ulmifolia Tussilago farfara
Typha angustifolia Typha latifolia
Ulmus alata Ulmus alata 'Lace Parasol'
Ulmus americana Ulmus americana 'Augustine'
Ulmus americana 'Columnaris' Ulmus americana 'Liberty'
Ulmus americana 'Morden' Ulmus americana 'Princeton'
Ulmus americana 'Valley Forge' Ulmus americana var. floridana
Ulmus crassifolia Ulmus serotina
Umbellularia californica Ungnadia speciosa
Uniola paniculata Utricularia vulgaris
Uvularia grandiflora Uvularia sessilifolia
Vaccinium angustifolium Vaccinium arboreum
Vaccinium corymbosum Vaccinium corymbosum 'Herbert'
Vaccinium ovatum Vaccinium vitis-idaea
Vancouveria hexandra Vauquelina californica
Verbena canadensis 'Homestead Purple' Verbena canadensis 'Rosea'
Verbena maritima Verbesina alternifolia
Vernonia lettermannii 'Iron Butterfly' Vernonia noveboracensis
Veronicastrum virginicum Veronicastrum virginicum 'Album'
Veronicastrum virginicum var. sibericum