| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| TOTA | Torreya taxifolia Arn. | Florida nutmeg | Taxaceae
|
| TORRE | Torreya Arn. | torreya | Taxaceae
|
| TOCA2 | Torreyochloa californica (Beetle) Church | Sierra false mannagrass | Poaceae
|
| TOER | Torreyochloa erecta (A.S. Hitchc.) Church | spiked false mannagrass | Poaceae
|
| TOFE2 | Torreyochloa fernaldii (A.S. Hitchc.) Church | Torreyochloa pallida var. fernaldii | Poaceae
|
| TOPAF | Torreyochloa pallida (Torr.) Church var. fernaldii (A.S. Hitchc.) Dore ex Koyama & Kawano | Fernald's false mannagrass | Poaceae
|
| TOPAP | Torreyochloa pallida (Torr.) Church var. pallida | pale false mannagrass | Poaceae
|
| TOPAP3 | Torreyochloa pallida (Torr.) Church var. pauciflora (J. Presl) J.I. Davis | pale false mannagrass | Poaceae
|
| TOPA6 | Torreyochloa pallida (Torr.) Church | pale false mannagrass | Poaceae
|
| TOPAH | Torreyochloa pauciflora (J. Presl) Church var. holmii (Beal) Taylor & MacBryde | Torreyochloa pallida var. pauciflora | Poaceae
|
| TOPAM | Torreyochloa pauciflora (J. Presl) Church var. microtheca (Buckl.) Taylor & MacBryde | Torreyochloa pallida var. pauciflora | Poaceae
|
| TOPA3 | Torreyochloa pauciflora (J. Presl) Church | Torreyochloa pallida var. pauciflora | Poaceae
|
| TORRE2 | Torreyochloa Church | false mannagrass | Poaceae
|
| TOBR2 | Torrubia bracei Britt. | Guapira discolor | Nyctaginaceae
|
| TODI2 | Torrubia discolor (Spreng.) Britt. | Guapira discolor | Nyctaginaceae
|
| TOFL3 | Torrubia floridana (Britt. ex Small) Britt. | Pisonia floridana | Nyctaginaceae
|
| TOFR2 | Torrubia fragrans (Dum.-Cours.) Standl. | Guapira fragrans | Nyctaginaceae
|
| TOGL5 | Torrubia globosa Small | Guapira globosa | Nyctaginaceae
|
| TOLO2 | Torrubia longifolia (Heimerl) Britt. | Guapira discolor | Nyctaginaceae
|
| TOOB | Torrubia obtusata (Jacq.) Britt. | Guapira obtusata | Nyctaginaceae
|
| TOAR70 | Tortella arctica (Arnell) Crundw. & Nyh. | arctic tortella moss | Pottiaceae
|
| TOCA11 | Tortella caespitosa (Schwaegr.) Limpr. | Tortella humilis | Pottiaceae
|
| TOFL4 | Tortella flavovirens (Bruch in F. Muell.) Broth. | tortella moss | Pottiaceae
|
| TOFR70 | Tortella fragilis (Hook. & Wils. in Drumm.) Limpr. | fragile tortella moss | Pottiaceae
|
| TOHU2 | Tortella humilis (Hedw.) Jenn. | tortella moss | Pottiaceae
|
| TOIN4 | Tortella inclinata (Hedw. f.) Limpr. | tortella moss | Pottiaceae
|
| TOIN6 | Tortella inclinatula (C. M�ll. & Kindb. in Mac. & Kindb.) Broth. | Tortella inclinata | Pottiaceae
|
| TORI | Tortella rigens Alb. | tortella moss | Pottiaceae
|
| TOTO3 | Tortella tortelloides (S. W. Greene) Robins. | tortella moss | Pottiaceae
|
| TOTO70 | Tortella tortuosa (Hedw.) Limpr. | tortured tortella moss | Pottiaceae
|
| TORTE | Tortella (Lindb.) Limpr. | tortella moss | Pottiaceae
|
| TOAM | Tortipes amplexifolius (L.) Small | Streptopus amplexifolius var. amplexifolius | Liliaceae
|
| TOAG | Tortula agraria (Hedw.) P. Beauv. | Barbula agraria | Pottiaceae
|
| TOALI | Tortula alpina (Milde) De Not. var. inermis (Milde) De Not. | Tortula sinensis | Pottiaceae
|
| TOAM3 | Tortula ammonsiana Crum & Anderson | Ammons' tortula moss | Pottiaceae
|
| TOAM4 | Tortula amphidiacea (C. M�ll.) Broth. | tortula moss | Pottiaceae
|
| TOAM5 | Tortula amplexa (Lesq.) Steere | tortula moss | Pottiaceae
|
| TOAU3 | Tortula aurea Bartr. | Pseudocrossidium aureum | Pottiaceae
|
| TOBA3 | Tortula bartramii Steere in Grout | Bartram's tortula moss | Pottiaceae
|
| TOBI2 | Tortula bistratosa Flow. | Tortula caninervis | Pottiaceae
|
| TOBO | Tortula bolanderi (Lesq.) Howe | Bolander's tortula moss | Pottiaceae
|
| TOBR3 | Tortula brevipes (Lesq.) Broth. | tortula moss | Pottiaceae
|
| TOCA8 | Tortula cainii Crum & Anderson | Cain's tortula moss | Pottiaceae
|
| TOCA9 | Tortula californica Bartr. | California tortula moss | Pottiaceae
|
| TOCA10 | Tortula caninervis (Mitt.) Broth. | tortula moss | Pottiaceae
|
| TOCA12 | Tortula caroliniana Andrews | Tortula amphidiacea | Pottiaceae
|
| TOCH | Tortula chisosa Magill et al. | tortula moss | Pottiaceae
|
| TODE3 | Tortula desertorum Broth. | Tortula caninervis | Pottiaceae
|
| TOFR3 | Tortula fragilis Tayl. | fragile tortula moss | Pottiaceae
|
| TOHI2 | Tortula hirsuta Vent. | Tortula papillosissima | Pottiaceae
|
| TOIN5 | Tortula inermis (Brid.) Mont. | tortula moss | Pottiaceae
|
| TOIN7 | Tortula intermedia (Brid.) De Not. | Tortula ruralis | Pottiaceae
|
| TOLAL | Tortula laevipila (Brid.) Schwaegr. var. laevipila | tortula moss | Pottiaceae
|
| TOLAM | Tortula laevipila (Brid.) Schwaegr. var. meridionalis (Schimp.) Wijk & Marg. | tortula moss | Pottiaceae
|
| TOLAP | Tortula laevipila (Brid.) Schwaegr. var. pagorum Husn. | Tortula laevipila var. laevipila | Pottiaceae
|
| TOLAP2 | Tortula laevipila (Brid.) Schwaegr. var. propagulifera Lindb. | Tortula pagorum | Pottiaceae
|
| TOLAW | Tortula laevipila (Brid.) Schwaegr. var. wachteri Barkm. | Tortula pagorum | Pottiaceae
|
| TOLA5 | Tortula laevipila (Brid.) Schwaegr. | tortula moss | Pottiaceae
|
| TOLA4 | Tortula latifolia Bruch ex Hartm. | wideleaf tortula moss | Pottiaceae
|
| TOMU70 | Tortula mucronifolia Schwaegr. | mucronleaf tortula moss | Pottiaceae
|
| TOMU | Tortula muralis Hedw. | tortula moss | Pottiaceae
|
| TONO2 | Tortula norvegica (Web.) Wahlenb. ex Lindb. | Norwegian tortula moss | Pottiaceae
|
| TOOB3 | Tortula obtusifolia (Schwaegr.) Mathieu | Desmatodon obtusifolius | Pottiaceae
|
| TOOB2 | Tortula obtusissima (C. M�ll.) Mitt. | obtuse tortula moss | Pottiaceae
|
| TOPA7 | Tortula pagorum (Milde) De Not. | tortula moss | Pottiaceae
|
| TOPA8 | Tortula papillosa Wils. in Spruce | papillose tortula moss | Pottiaceae
|
| TOPA9 | Tortula papillosissima (Copp.) Broth. | tortula moss | Pottiaceae
|
| TOPR | Tortula princeps De Not. | tortula moss | Pottiaceae
|
| TOPR2 | Tortula propagulosa Sharp | Rhachithecium perpusillum | Rhachitheciaceae
|
| TORE | Tortula reflexa Brid. | Didymodon fallax var. reflexus | Pottiaceae
|
| TORH | Tortula rhizophylla (Sak.) Iwats. & Saito | tortula moss | Pottiaceae
|
| TORU2 | Tortula ruraliformis (Besch.) Ingh. | Tortula ruralis | Pottiaceae
|
| TORUC | Tortula ruralis (Hedw.) Gaertn. et al. var. crinita De Not. | Tortula ruralis | Pottiaceae
|
| TORUH | Tortula ruralis (Hedw.) Gaertn. et al. var. hirsuta (Vent.) Par. | Tortula papillosissima | Pottiaceae
|
| TORU70 | Tortula ruralis (Hedw.) Gaertn. et al. | tortula moss | Pottiaceae
|
| TOSC4 | Tortula scotteri Zand. & Steere | Scotter's tortula moss | Pottiaceae
|
| TOSI2 | Tortula sinensis (C. M�ll.) Broth. | China tortula moss | Pottiaceae
|
| TOST2 | Tortula stanfordensis Steere | Stanford tortula moss | Pottiaceae
|
| TOSUA | Tortula subulata Hedw. var. angustata (Schimp.) Lindb. | Tortula subulata | Pottiaceae
|
| TOSU2 | Tortula subulata Hedw. | tortula moss | Pottiaceae
|
| TOVE4 | Tortula vectensis Warb. & Crundw. | Tortula rhizophylla | Pottiaceae
|
| TOVI3 | Tortula virescens (De Not.) De Not. | tortula moss | Pottiaceae
|
| TOWI | Tortula williamsii Bartr. | Scopelophila cataractae | Pottiaceae
|
| TORTU | Tortula Hedw. | tortula moss | Pottiaceae
|
| TOAR4 | Torularia arctica (B�cher) A.& D. L�ve | Braya humilis | Brassicaceae
|
| TOHUA | Torularia humilis (C.A. Mey.) O.E. Schulz ssp. arctica B�cher | Braya humilis | Brassicaceae
|
| TOHU | Torularia humilis (C.A. Mey.) O.E. Schulz | Braya humilis | Brassicaceae
|
| TOCO3 | Torulinium confertum Desv. ex Hamilton | Cyperus odoratus | Cyperaceae
|
| TOEG | Torulinium eggersii (Boeckl.) C.B. Clarke | Cyperus odoratus | Cyperaceae
|
| TOFI2 | Torulinium filiforme (Sw.) C.B. Clarke | Cyperus filiformis | Cyperaceae
|
| TOODA | Torulinium odoratum (L.) S. Hooper ssp. auriculatum (Nees & Meyen ex Kunth) T. Koyama | Cyperus auriculatus | Cyperaceae
|
| TOOD | Torulinium odoratum (L.) S. Hooper | Cyperus odoratus | Cyperaceae
|
| TOAN3 | Touchardia angusta St. John | Touchardia latifolia | Urticaceae
|
| TOLA | Touchardia latifolia Gaud. | olona | Urticaceae
|
| TOUCH | Touchardia Gaud. | touchardia | Urticaceae
|
| TOPA11 | Toumeya papyracantha (Engelm.) Britt. & Rose | Sclerocactus papyracanthus | Cactaceae
|
| TOAR2 | Tournefortia argentea L. f. | velvetleaf soldierbush | Boraginaceae
|
| TOBI | Tournefortia bicolor Sw. | niguita | Boraginaceae
|
| TOFI | Tournefortia filiflora Griseb. | cold withe | Boraginaceae
|
| TOGN | Tournefortia gnaphalodes (L.) R. Br. ex Roemer & J.A. Schultes | Argusia gnaphalodes | Boraginaceae
|
| TOHI | Tournefortia hirsutissima L. | chiggery grapes | Boraginaceae
|