T
- Taenidia integerrima (N)
- Tagetes erecta (I)
- Tagetes patula (I)
- Tamarix chinensis (I)
- Tanacetum balsamita (I)
- Tanacetum coccineum (I)
- Tanacetum parthenium (I)
- Tanacetum vulgare (I)
- Taraxacum laevigatum (I)
- Taraxacum officinale (N)
- Taraxacum officinale ssp. officinale (I)
- Taxodium distichum (N)
- Taxus canadensis (N)
- Taxus cuspidata (I)
- Tephrosia virginiana (N)
- Tetradium daniellii (I)
- Tetragonia tetragonioides (I)
- Tetraneuris herbacea (N)
- Teucrium canadense var. canadense (N)
- Teucrium canadense var. occidentale (N)
- Thalictrum dasycarpum (N)
- Thalictrum dioicum (N)
- Thalictrum pubescens (N)
- Thalictrum revolutum (N)
- Thalictrum thalictroides (N)
- Thaspium barbinode (N)
- Thaspium trifoliatum var. aureum (N)
- Thaspium trifoliatum var. trifoliatum (N)
- Thelypteris noveboracensis (N)
- Thelypteris palustris var. pubescens (N)
- Thlaspi alliaceum (I)
- Thlaspi arvense (I)
- Thuja occidentalis (N)
- Thymelaea passerina (I)
- Thymelaea passerina (N)
- Thymus praecox ssp. arcticus (I)
- Tiarella cordifolia var. cordifolia (N)
- Tilia americana var. americana (N)
- Tilia americana var. heterophylla (N)
- Tilia × europaea (I)
- Tipularia discolor (N)
- Torilis arvensis ssp. arvensis (N)
- Torilis arvensis ssp. arvensis (I)
- Torilis japonica (I)
- Torreyochloa pallida var. pallida (N)
- Toxicodendron radicans ssp. negundo (N)
- Toxicodendron rydbergii (N)
- Toxicodendron vernix (N)
- Tradescantia ohiensis (N)
- Tradescantia subaspera var. subaspera (N)
- Tradescantia virginiana (N)
- Tragopogon dubius (I)
- Tragopogon lamottei (I)
- Tragopogon porrifolius (I)
- Triadenum fraseri (N)
- Triadenum tubulosum (N)
- Triadenum virginicum (N)
- Triadenum walteri (N)
- Triantha glutinosa (N)
- Tribulus terrestris (I)
- Trichomanes boschianum (N)
- Trichomanes intricatum (N)
- Trichophorum planifolium (N)
- Trichostema brachiatum (N)
- Trichostema dichotomum (N)
- Trichostema setaceum (N)
- Tridens flavus var. flavus (N)
- Trientalis borealis ssp. borealis (N)
- Trifolium ambiguum (I)
- Trifolium arvense (I)
- Trifolium aureum (I)
- Trifolium campestre (I)
- Trifolium dubium (I)
- Trifolium hybridum (I)
- Trifolium incarnatum (I)
- Trifolium pratense (I)
- Trifolium reflexum (N)
- Trifolium repens (I)
- Trifolium resupinatum (I)
- Trifolium stoloniferum (N)
- Triglochin maritima (N)
- Triglochin palustris (N)
- Trillium cernuum (N)
- Trillium erectum (N)
- Trillium flexipes (N)
- Trillium grandiflorum (N)
- Trillium nivale (N)
- Trillium recurvatum (N)
- Trillium sessile (N)
- Trillium undulatum (N)
- Triodanis perfoliata (N)
- Triosteum angustifolium (N)
- Triosteum aurantiacum var. aurantiacum (N)
- Triosteum aurantiacum var. glaucescens (N)
- Triosteum aurantiacum var. illinoense (N)
- Triosteum perfoliatum (N)
- Triphora trianthophora (N)
- Triplasis purpurea (N)
- Tripleurospermum maritimum (N)
- Tripleurospermum maritimum ssp. maritimum (I)
- Tripsacum dactyloides (N)
- Triticum aestivum (I)
- Trollius laxus ssp. laxus (N)
- Tsuga canadensis (N)
- Tulipa gesneriana (I)
- Tussilago farfara (I)
- Typha angustifolia (I)
- Typha angustifolia (N)
- Typha × glauca (N)
- Typha latifolia (N)
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