| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| TRPEI | Triosteum perfoliatum L. var. illinoense Wieg. | Triosteum aurantiacum var. illinoense | Caprifoliaceae
|
| TRPE5 | Triosteum perfoliatum L. | feverwort | Caprifoliaceae
|
| TRIOS | Triosteum L. | horse-gentian | Caprifoliaceae
|
| TRGL8 | Triphasia glauca Lindley | Eremocitrus glauca | Rutaceae
|
| TRTR7 | Triphasia trifolia (Burm. f.) P. Wilson | limeberry | Rutaceae
|
| TRTR15 | Triphasia trifoliata (L.) DC. | Triphasia trifolia | Rutaceae
|
| TRIPH2 | Triphasia Lour. | triphasia | Rutaceae
|
| TRCR4 | Triphora craigheadii Luer | Craighead's noddingcaps | Orchidaceae
|
| TRCU2 | Triphora cubensis (Reichenb. f.) Ames | Triphora gentianoides | Orchidaceae
|
| TRGE | Triphora gentianoides (Sw.) Ames & Schlechter | gentian noddingcaps | Orchidaceae
|
| TRHA7 | Triphora hassleriana (Cogn.) Schlechter | Hassler's noddingcaps | Orchidaceae
|
| TRLA17 | Triphora latifolia Luer f. | broadleaf noddingcaps | Orchidaceae
|
| TRRI4 | Triphora rickettii Luer | Triphora yucatanensis | Orchidaceae
|
| TRSU4 | Triphora surinamensis (Lindl.) Britt. | Hernando County noddingcaps | Orchidaceae
|
| TRTRS | Triphora trianthophora (Sw.) Rydb. var. schaffneri Camp | Triphora trianthophora | Orchidaceae
|
| TRTR3 | Triphora trianthophora (Sw.) Rydb. | threebirds | Orchidaceae
|
| TRYU | Triphora yucatanensis Ames | Yucatan noddingcaps | Orchidaceae
|
| TRIPH | Triphora Nutt. | noddingcaps | Orchidaceae
|
| TRERE2 | Triphysaria eriantha (Benth.) Chuang & Heckard ssp. eriantha | johnny-tuck | Scrophulariaceae
|
| TRERR | Triphysaria eriantha (Benth.) Chuang & Heckard ssp. rosea (Gray) Chuang & Heckard | johnny-tuck | Scrophulariaceae
|
| TRER6 | Triphysaria eriantha (Benth.) Chuang & Heckard | johnny-tuck | Scrophulariaceae
|
| TRFL14 | Triphysaria floribunda (Benth.) Chuang & Heckard | San Francisco owl's-clover | Scrophulariaceae
|
| TRMI16 | Triphysaria micrantha (Greene ex Heller) Chuang & Heckard | purplebeak owl's-clover | Scrophulariaceae
|
| TRPU16 | Triphysaria pusilla (Benth.) Chuang & Heckard | dwarf owl's-clover | Scrophulariaceae
|
| TRVEF | Triphysaria versicolor Fisch. & C.A. Mey. ssp. faucibarbatus (Gray) Chuang & Heckard | yellowbeak owl's-clover | Scrophulariaceae
|
| TRVEV | Triphysaria versicolor Fisch. & C.A. Mey. ssp. versicolor | yellowbeak owl's-clover | Scrophulariaceae
|
| TRVE6 | Triphysaria versicolor Fisch. & C.A. Mey. | yellowbeak owl's-clover | Scrophulariaceae
|
| TRIPH3 | Triphysaria Fisch. & C.A. Mey. | owl's-clover | Scrophulariaceae
|
| TRAM7 | Triplasis americana Beauv. | perennial sandgrass | Poaceae
|
| TRIN7 | Triplasis intermedia Nash | Triplasis purpurea | Poaceae
|
| TRPU4 | Triplasis purpurea (Walt.) Chapman | purple sandgrass | Poaceae
|
| TRIPL2 | Triplasis Beauv. | sandgrass | Poaceae
|
| TRIN11 | Tripleurospermum inodorum (L.) Schultz-Bip. | Tripleurospermum perforata | Asteraceae
|
| TRMAM | Tripleurospermum maritima (L.) W.D.J. Koch ssp. maritima | false mayweed | Asteraceae
|
| TRMAP | Tripleurospermum maritima (L.) W.D.J. Koch ssp. phaeocephala (Rupr.) Hamet-Ahti | false mayweed | Asteraceae
|
| TRMA17 | Tripleurospermum maritima (L.) W.D.J. Koch | false mayweed | Asteraceae
|
| TRPE21 | Tripleurospermum perforata (Merat) M. Lainz | scentless false mayweed | Asteraceae
|
| TRPH2 | Tripleurospermum phaeocephalum (Rupr.) Pobed. | Tripleurospermum maritima ssp. phaeocephala | Asteraceae
|
| TRIPL4 | Tripleurospermum Schultz-Bip. | mayweed | Asteraceae
|
| TRFU2 | Triplophyllum funestum (Kunze) Holttum | fountain fern | Dryopteridaceae
|
| TRIPL3 | Triplophyllum Holttum | triplophyllum | Dryopteridaceae
|
| TREL9 | Tripogandra elongata (G.F.W. Mey.) Woods. | Tripogandra serrulata | Commelinaceae
|
| TRSE3 | Tripogandra serrulata (Vahl) Handlos | pink Trinity | Commelinaceae
|
| TRIPO2 | Tripogandra Raf. | tripogandra | Commelinaceae
|
| TRSP | Tripogon spicatus (Nees) Ekman | American fiveminute grass | Poaceae
|
| TRIPO | Tripogon Roemer & J.A. Schultes | fiveminute grass | Poaceae
|
| TRAN7 | Tripolium angustum Lindl. | Symphyotrichum ciliatum | Asteraceae
|
| TRFR3 | Tripolium frondosum Nutt. | Symphyotrichum frondosum | Asteraceae
|
| TROC3 | Tripolium occidentale Nutt. | Symphyotrichum spathulatum var. spathulatum | Asteraceae
|
| TROR5 | Tripolium oregonum Nutt. | Symphyotrichum subspicatum var. subspicatum | Asteraceae
|
| TRPA26 | Tripolium pannonicum (Jacq.) Dobrocz. | sea aster | Asteraceae
|
| TRSUP | Tripolium subulatum (L.) Nees var. parviflorum Nees | Symphyotrichum expansum | Asteraceae
|
| TRIPO3 | Tripolium Nees | sea aster | Asteraceae
|
| TRDAO | Tripsacum dactyloides (L.) L. var. occidentale Cutler & Anders. | Tripsacum dactyloides | Poaceae
|
| TRDA3 | Tripsacum dactyloides (L.) L. | eastern gamagrass | Poaceae
|
| TRFA2 | Tripsacum fasciculatum Trin. ex Aschers. | Guatemalan gamagrass | Poaceae
|
| TRFL4 | Tripsacum floridanum Porter ex Vasey | Florida gamagrass | Poaceae
|
| TRHE4 | Tripsacum hermaphrodita L. | Anthephora hermaphrodita | Poaceae
|
| TRLA11 | Tripsacum lanceolatum Rupr. ex Fourn. | Mexican gamagrass | Poaceae
|
| TRLA24 | Tripsacum latifolium Hitchc. | wideleaf gamagrass | Poaceae
|
| TRLA25 | Tripsacum laxum Nash | Tripsacum fasciculatum | Poaceae
|
| TRIPS | Tripsacum L. | gamagrass | Poaceae
|
| TRCAC | Tripterocalyx carnea (Greene) L.A. Gal. var. carnea | winged sandpuffs | Nyctaginaceae
|
| TRCAW | Tripterocalyx carnea (Greene) L.A. Gal. var. wootonii (Standl.) L.A. Gal. | Wooton's sandpuffs | Nyctaginaceae
|
| TRCA13 | Tripterocalyx carnea (Greene) L.A. Gal. | winged sandpuffs | Nyctaginaceae
|
| TRCR5 | Tripterocalyx crux-maltae (Kellogg) Standl. | Lassen sandverbena | Nyctaginaceae
|
| TRCY4 | Tripterocalyx cyclopterus (Gray) Standl. | Tripterocalyx micranthus | Nyctaginaceae
|
| TRMI6 | Tripterocalyx micranthus (Torr.) Hook. | smallflower sandverbena | Nyctaginaceae
|
| TRPE17 | Tripterocalyx pedunculatus (M.E. Jones) Standl. | Tripterocalyx micranthus | Nyctaginaceae
|
| TRWO4 | Tripterocalyx wootonii Standl. | Tripterocalyx carnea var. wootonii | Nyctaginaceae
|
| TRIPT | Tripterocalyx Hook. ex Standl. | sandpuffs | Nyctaginaceae
|
| TRLE6 | Tripterocladium leucocladulum (C. M�ll.) Jaeg. | tripterocladium moss | Hypnaceae
|
| TRRU8 | Tripterocladium rupestris (Kindb.) Kindb. | Tripterocladium leucocladulum | Hypnaceae
|
| TRIPT2 | Tripterocladium (C. M�ll.) Jaeg. | tripterocladium moss | Hypnaceae
|
| TRCA25 | Triquetrella californica (Lesq.) Grout | California triquetrella moss | Pottiaceae
|
| TRIQU | Triquetrella C. M�ll. | triquetrella moss | Pottiaceae
|
| TRHI6 | Trisetobromus hirtus (Trin.) Nevski | Bromus berterianus | Poaceae
|
| TRAU3 | Trisetum aureum (Ten.) Ten. | golden oatgrass | Poaceae
|
| TRCA21 | Trisetum canescens Buckl. | tall trisetum | Poaceae
|
| TRCEC3 | Trisetum cernuum Trin. ssp. canescens (Buckl.) Calder & Taylor | Trisetum canescens | Poaceae
|
| TRCEC | Trisetum cernuum Trin. var. canescens (Buckl.) Beal | Trisetum canescens | Poaceae
|
| TRCEP | Trisetum cernuum Trin. var. projectum (Louis-Marie) Beetle | Trisetum canescens | Poaceae
|
| TRCE2 | Trisetum cernuum Trin. | Trisetum canescens | Poaceae
|
| TRFL5 | Trisetum flavescens (L.) Beauv. | yellow oatgrass | Poaceae
|
| TRGL3 | Trisetum glomeratum (Kunth) Trin. ex Steud. | pili uka | Poaceae
|
| TRIN4 | Trisetum inaequale Whitney | Whitney's false oat | Poaceae
|
| TRIN5 | Trisetum interruptum Buckl. | prairie false oat | Poaceae
|
| TRLI4 | Trisetum litorale (Rupr. ex Rosh.) Czern. | Trisetum sibiricum ssp. litorale | Poaceae
|
| TRMEM | Trisetum melicoides (Michx.) Vasey ex Scribn. var. majus (Gray) A.S. Hitchc. | Trisetum melicoides | Poaceae
|
| TRME3 | Trisetum melicoides (Michx.) Vasey ex Scribn. | purple false oat | Poaceae
|
| TRMOS | Trisetum montanum Vasey var. shearii Louis-Marie | Trisetum spicatum | Poaceae
|
| TRMO5 | Trisetum montanum Vasey | Trisetum spicatum | Poaceae
|
| TROR3 | Trisetum orthochaetum A.S. Hitchc. | hybrid false oat | Poaceae
|
| TRPE6 | Trisetum pensylvanicum (L.) Beauv. ex Roemer & J.A. Schultes | Sphenopholis pensylvanica | Poaceae
|
| TRPU11 | Trisetum purpurascens Torr. | Schizachne purpurascens | Poaceae
|
| TRSIL | Trisetum sibiricum Rupr. ssp. litorale (Rupr. ex Rosh.) Rosh. | Siberian oatgrass | Poaceae
|
| TRSI2 | Trisetum sibiricum Rupr. | Siberian oatgrass | Poaceae
|
| TRSPA | Trisetum spicatum (L.) Richter ssp. alaskanum (Nash) Hult�n | Trisetum spicatum | Poaceae
|
| TRSPC | Trisetum spicatum (L.) Richter ssp. congdonii (Scribn. & Merr.) Hult�n | Trisetum spicatum | Poaceae
|
| TRSPM2 | Trisetum spicatum (L.) Richter ssp. majus (Rydb.) Hult�n | Trisetum spicatum | Poaceae
|
| TRSPM3 | Trisetum spicatum (L.) Richter ssp. molle (Kunth) Hult�n | Trisetum spicatum | Poaceae
|