Plants with yellow or green flowers
 Tanacetum vulgare (Tansy) |
 Taraxia breviflora (Taraxia, Short-Flowered Suncup) |
 Tephroseris palustris (Marsh Ragwort) |
 Thalictrum dasycarpum (Tall Meadow Rue) |
 Thalictrum venulosum (Veiny Meadow Rue) |
 Thermopsis rhombifolia (Golden Bean) |
 Toxicodendron rydbergii (Poison Ivy) |
 Toxicoscordion venenosum (Death Camas) |
 Tragopogon dubius (Goat's Beard) |
 Urtica dioica (Stinging Nettle) |
 Utricularia intermedia (Flat-leaved Bladderwort) |
 Utricularia minor (Lesser Bladderwort) |
 Utricularia vulgaris (Greater Bladderwort) |
 Viola nuttallii (Nuttall's Yellow Violet) |
 Viola pubescens (Downy Yellow Violet) |
 Viola vallicola (Yellow Meadow Violet) |
 Xanthisma grindelioides (Toothed Iron Plant) |
 Xanthisma spinulosum (Spiny Iron Plant) |
 Xanthium strumarium (Cocklebur) |
 Zizia aptera (Heart-leaved Alexanders) |