- tanniferous
- taproot
- taxon
- taxonomy
- tendril
- tepal
- terete
- terminal
- ternate
- tessellate
- testa
- tetramerous
- tetraploid
- theca
- thorn
- thyrse
- thyrsiform
- thyrsoid
- tomentellous
- tomentose
- tonic
- tortuous
- trailing
- trapeziform
- trapezoid
- tree
- triangular
- tribe
- trichome
- trichotomous
- trifoliolate
- trigonous
- trimerous
- triploid
- truncate
- trunk
- tube
- tuber
- tubercle
- tuberculate
- tuberiform
- tuberous
- tubular
- tufted
- turbinate
- turgid
- twining
- type