Spring Flora of Oklahoma 239 
Thlaspi __ 55 
Thread-leaved Sjundrops _ 117 
Three-leaved Hop-tree _ 88 
Three-lobed Primrose _ 118 
Three-lobed Violet __ 111 
Thyme-leaved Spurge _ _ 93 
Tienturier’s Chervil _ 123 
Tiliacese _ 107 
Tilia_ _ 107 
Tithymalopsis _ 94 
Tithymalus_ _ 95 
Tooth-leaved Primrose _ 119 
Toothache Tree _ r _ 88 
Torrey’s Nightshade _ _._ 159 
Townsendia __ 189 
Toxylon __ 32 
Toxicoscordion __ 4 
Toxicodendron __ 97 
Trailing Bindweed _ 140 
Tradescantia _, _ :3 
Tragia- - 91 
Tragopogon _ 183 
Trifolium_ _ 75 
Triosteum _ 175 
Tribulus __ 8G 
Trumpet-creeper Family _16G 
True Water-cress - 54 
Turnip, Indian _ 1 
Ulmaceae __ 29 
rimus __ 29 
Umbrella-wort, Pale - 38 
Umbrella-wort, Heart-leaved _ 38 
Upland Sumac _ 96 
Upright Spotted Spurge _ 94 
Upright Bindweed _ 140 
Upright Yellow Wood-sorrel _ 84 
Valerianaceae _1_ 176 
Valerian Family _ 176 
Valerianella _ 176 
Various-leaved Spurge - 95 
Verbenacese - 148 
Verbena - 148 
Veronica - 165 
Veined Dock _ 34 
