Tacky Phacelia          

Taenidia          

Tall Blue Lettuce          

Tall Bluebells          

Tall Buttercup          

Tall Cinquefoil      

Tall Hairy Agrimony      

Tall Hawkweed          

Tall Horned Beaksedge          

Tall Lespedeza          

Tall Morning-glory          

Tall Oatgrass      

Tall Rattlesnakeroot          

Tall Thimbleweed          

Tall Thistle          

Tall Thoroughwort          

Tall Tickseed          

Tall Tumblemustard          

Tamarack      

Tamarisk          

Tansy          

Tansymustard          

Tapered Rosette Grass          

Taperleaf Water Horehound      

Tapertip Rush      

Tarragon          

Tarweed          

Tarweed Fiddleneck      

Tasteless Stonecrop          

Tatarian Aster          

Tatarian Honeysuckle      

Tatarian Orache          

Tawny Cottongrass      

Tea Viburnum          

Teasel          

Ternate Grapefern          

Terrestrial Water-starwort          

Tetragonia          

Texas Star          

Thicket Sedge      

Thin Paspalum          

Thinleaf Cottonsedge          

Thinleaf Late Purple Aster          

Thinleaf Sedge