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| Common Name | Scientific Name | |
| Tall Morningglory | Ipomoea purpurea | |
| Tall Oatgrass (Bulbous) | Arrhenatherum elatius var. bulbosa | |
| Tall Thistle | Cirsium altissimum | |
| Tearthumb, Arrow-leaved | Polygonum sagittatum | |
| Tearthumb | Polygonum arifolium | |
| Teasel, Common | Dipsacus fullonum | |
| Teaweed | Sida spinosa | |
| Texas Panicum | Panicum texanum | |
| Thistle, Bull | Cirsium vulgare | |
| Thistle, Canada | Cirsium arvense | |
| Thistle, Musk | Carduus nutans | |
| Thistle, Plumeless | Carduus acanthoides | |
| Thistle, Star | Centaurea maculosa | |
| Thistle, Tall | Cirsium altissimum | |
| Thoroughwort Pennycress | Thlaspi perfoliatum | |
| Tick Trefoil | Desmodium viridiflorum | |
| Toadflax, Common | Linaria canadensis | |
| Toothed Spurge | Euphorbia dentata | |
| Touch-me-not | Impatiens capensis | |
| Trailing Crownvetch | Coronilla varia | |
| Tree-of-Heaven | Ailanthus altissima | |
| Tropic Croton | Croton glandulosus | |
| Trumpetcreeper | Campsis radicans | |
| Tufted Knotweed | Polygonum caespitosum var. longisetum |
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