Tree everlasting 
Triangle-leaf Bursage 
Tripleurospermum auriculatum 
Tripleurospermum oreades 
Tuberous hawk's-beard 
Tuberous Hawkbit 
Tufted Horned Rampion 
Tussock Bellflower 
Tyrol Knapweed 
Upright Prairie Coneflower 
Variable-leaved Goodenia 
Velvet centaurea 
Velvet plant 
Velvet Turtleback 
Venus' Looking-glass 
Vipers grass 
Volutaria crupinoides 
Volutaria lippii 
Volutaria maroccana 
Wall Bellflower 
Wall lettuce 
Wandering daisy 
Warionia 
Water Snowflake