Tecomella 
Teucrium brevifolium 
Teucrium capitatum 
Teucrium creticum 
Teucrium decaisnei 
Teucrium hircanicum 
Teucrium lamiifolium 
Teucrium montbretii 
Teucrium orientale 
Teucrium parviflorum 
Teucrium pruinosum 
Teucrium pseudochamaepitys 
Teucrium spinosum 
Teucrium_scordium 
Texas Toadflax 
Thompson's Indian paintbrush 
Three-leaved Toadflax 
Thunbergia fragrans 
Thurber’s Desert Honeysuckle 
Thymbra spicata 
Thyme Broomrape 
Thyme-leaved Savory 
Thyme-leaved Speedwell 
Thymus bovei