- tomentose
- tomato
- tomentous
- tomentum
- toxiferous
- torus
- tracheae
- tori
- trachea
- tracheal
- transpiration
- transpire
- trefoil
- triadelphous
- tricarpellate
- tricotyledonous
- trifid
- trigonal
- trilobate
- tripetalous
- trilocular
- tripartite
- triphyllous
- triquetrous
- trisepalous
- tropism
- truffle
- tree-fern
- tube
- tuber
- tubercle
- tubercular
- tuberculate
- tuberose
- tuberous
- tung-tree
- triandrous
- trifoliate
- trigynous
- tripinnate
- tubuliflorous
- tubulous
- tulip
- tunic
- tunicate
- turkey corn
- turmeric
- turpeth
- ulex
- umbellar
- umbelliform
- unblown
- turnip
- turnsole
- twining
- two-cleft
- umbel
- umbellate
- umbrella-tree
- twin-flower
- twin-fruited
- twitch
- umbelliferous
- undergrown
- ungulae
- uniflorous
- ungula
- unilocular
- unisexed
- unifoliate
- unisexual
- urticaceous
- upas
- urceolate
- vagina
- vaginae
- valerian
- valvar
- valvate
- valve
- valved
- valveless
- valvule
- vanilla
- varec
- varech
- vegetable
- vegetate
- vein
- veined
- velamen
- velamina
- velutinous
- venose
- ventrodorsal
- verbena
- vernation
- veronica
- versatility
- verticel