- tálamo, thalamus
- tallo, stem, culm
- tallo florífero, flowering stem
- tamaño, size
- tapete, tapetum, mat
- taxa, taxa
- taxon, taxon
- teca, theca
- tectot, clothing hair
- tentacular (leaf), tentacular
- tenue, faint
- tépalo, tepal
- terete, tereti-, terete
- terminal, terminal
- ternado, ternate
- terófito, therophite
- Terranova, Newfoundland
- terrestre, terrestrial
- teselado, checkered, tessellated
- testa, testa
- tetra-, tetra-
- tétrada, tetrad
- tetradínamo, tetradynamous
- tetraédrico, tetrahedral
- tetrámero, tetramerous
- tetrandro, tetrandrous
- tetraquenio, cenobium, tetrachaenium
- tetrástico, tetrastichous
- tierras bajas, lowlands
- típico, typical (stamen)
- tirso, thyrse
- tirsoide, thyrsoid, thysiform
- toba volcánica, tuff
- tomento, tomentum
- tomentoso, tomentose
- tomentuloso, tomentulose
- torcido, twisted
- tornándose, becoming
- tortuoso, tortuous
- toruloso, torulose
- tosco, coarse
- trabeculado, trabeculate
- translúcido, hyaline, diaphanous, translucent
- transversal, transverse
- trepador, climbing
- tríada, triad
- triangular, triangular
- tricoma, trichome, hair
- tridínamo, tridynamous
- trigonal, trigonal
- trígono, trigonous
- trilete, trilete
- trima, tryma
- trímero, trimerous
- trioico, trioecious
- triquetro, triquetrous
- trisecto, trisect
- trístico, tristichous
- triternado, triternate
- tronco, trunk
- trulado, trullate, trulliform
- truncado, truncate
- tuberculado, tuberculate
- tubérculo, tubercle, tuber
- tuberoso, tuberous
- tubo, tube
- tubo calicino, calyx tube
- tubular, tubular
- tumescente, tumid
- túnica, tunic
- tunicado, tunicated
- turbinado, turbinate
- túrgido, turgid
- turión, turion
- turional, turioniferous