| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| TRICH18 | Trichothelium Mull. Arg. | trichothelium | Trichotheliaceae
|
| TROD2 | Triclinium odoratum Raf. | Sanicula odorata | Apiaceae
|
| TRPA13 | Triclisperma paucifolia (Willd.) Nieuwl. | Polygala paucifolia | Polygalaceae
|
| TRHI8 | Tricyrtis hirta (Thunb.) Hook. | toadlily | Liliaceae
|
| TRICY | Tricyrtis Wallich | tricyrtis | Liliaceae
|
| TRAC2 | Tridax accedens S.F. Blake | Cymophora accedens | Asteraceae
|
| TRPR5 | Tridax procumbens L. | coatbuttons | Asteraceae
|
| TRIDA | Tridax L. | tridax | Asteraceae
|
| TRAL2 | Tridens albescens (Vasey) Woot. & Standl. | white tridens | Poaceae
|
| TRAM | Tridens ambiguus (Ell.) J.A. Schultes | pine barren fluffgrass | Poaceae
|
| TRBU | Tridens buckleyanus (L.H. Dewey) Nash | Buckley's fluffgrass | Poaceae
|
| TRCA4 | Tridens carolinianus (Steud.) Henr. | Carolina fluffgrass | Poaceae
|
| TRCH4 | Tridens chapmanii (Small) Chase | Tridens flavus var. chapmanii | Poaceae
|
| TRCO2 | Tridens congestus (L.H. Dewey) Nash | pink fluffgrass | Poaceae
|
| TREL6 | Tridens elongatus (Buckl.) Nash | Tridens muticus var. elongatus | Poaceae
|
| TRER | Tridens eragrostoides (Vasey & Scribn.) Nash | lovegrass tridens | Poaceae
|
| TRFLC | Tridens flavus (L.) A.S. Hitchc. var. chapmanii (Small) Shinners | Chapman's tridens | Poaceae
|
| TRFLF | Tridens flavus (L.) A.S. Hitchc. var. flavus | purpletop tridens | Poaceae
|
| TRFL2 | Tridens flavus (L.) A.S. Hitchc. | purpletop tridens | Poaceae
|
| TRGR9 | Tridens grandiflorus (Vasey) Woot. & Standl. | Erioneuron avenaceum | Poaceae
|
| TRMUE | Tridens muticus (Torr.) Nash var. elongatus (Buckl.) Shinners | slim tridens | Poaceae
|
| TRMUM | Tridens muticus (Torr.) Nash var. muticus | slim tridens | Poaceae
|
| TRMU | Tridens muticus (Torr.) Nash | slim tridens | Poaceae
|
| TRNE5 | Tridens nealleyi (Vasey) Woot. & Standl. | Erioneuron nealleyi | Poaceae
|
| TROK | Tridens �oklahomensis (Featherly) Featherly (pro sp.) | Tridens muticus var. elongatus | Poaceae
|
| TRPI6 | Tridens pilosus (Buckl.) A.S. Hitchc. | Erioneuron pilosum | Poaceae
|
| TRPU10 | Tridens pulchellus (Kunth) A.S. Hitchc. | Dasyochloa pulchella | Poaceae
|
| TRST2 | Tridens strictus (Nutt.) Nash | longspike tridens | Poaceae
|
| TRTE2 | Tridens texanus (S. Wats.) Nash | Texas fluffgrass | Poaceae
|
| TRIDE | Tridens Roemer & J.A. Schultes | tridens | Poaceae
|
| TRAM11 | Trientalis americana Pursh | Trientalis borealis ssp. borealis | Primulaceae
|
| TRAR2 | Trientalis arctica Fisch. ex Hook. | Trientalis europaea ssp. arctica | Primulaceae
|
| TRBOB | Trientalis borealis Raf. ssp. borealis | starflower | Primulaceae
|
| TRBOL | Trientalis borealis Raf. ssp. latifolia (Hook.) Hult�n | broadleaf starflower | Primulaceae
|
| TRBO2 | Trientalis borealis Raf. | starflower | Primulaceae
|
| TREUA | Trientalis europaea L. ssp. arctica (Fisch. ex Hook.) Hult�n | arctic starflower | Primulaceae
|
| TREUA2 | Trientalis europaea L. var. arctica (Fisch. ex Hook.) Ledeb. | Trientalis europaea ssp. arctica | Primulaceae
|
| TREUL | Trientalis europaea L. var. latifolia (Hook.) Torr. | Trientalis borealis ssp. latifolia | Primulaceae
|
| TREU | Trientalis europaea L. | arctic starflower | Primulaceae
|
| TRLA6 | Trientalis latifolia Hook. | Trientalis borealis ssp. latifolia | Primulaceae
|
| TRIEN | Trientalis L. | starflower | Primulaceae
|
| TRAF3 | Trifolium africanum Ser. | African clover | Fabaceae
|
| TRAG | Trifolium agrarium L. p.p. | Trifolium aureum | Fabaceae
|
| TRAI | Trifolium aitonii Rydb. | Trifolium latifolium | Fabaceae
|
| TRALD | Trifolium albopurpureum Torr. & Gray var. dichotomum (Hook. & Arn.) Isely | Trifolium dichotomum | Fabaceae
|
| TRALN | Trifolium albopurpureum Torr. & Gray var. neolagopus (Loja.) McDermott | Trifolium albopurpureum | Fabaceae
|
| TRALO | Trifolium albopurpureum Torr. & Gray var. olivaceum (Greene) Isely | Trifolium olivaceum | Fabaceae
|
| TRAL5 | Trifolium albopurpureum Torr. & Gray | rancheria clover | Fabaceae
|
| TRAL6 | Trifolium alexandrinum L. | Egyptian clover | Fabaceae
|
| TRAM2 | Trifolium amabile Kunth | Aztec clover | Fabaceae
|
| TRAM15 | Trifolium ambiguum M. Bieb. | Kura clover | Fabaceae
|
| TRAM3 | Trifolium amoenum Greene | showy Indian clover | Fabaceae
|
| TRAM10 | Trifolium amphianthum Torr. & Gray | Trifolium polymorphum | Fabaceae
|
| TRAMH | Trifolium amplectens Torr. & Gray var. hydrophilum (Greene) Jepson | Trifolium depauperatum var. diversifolium | Fabaceae
|
| TRAMT | Trifolium amplectens Torr. & Gray var. truncatum (Greene) Jepson | Trifolium depauperatum var. stenophyllum | Fabaceae
|
| TRAM14 | Trifolium amplectens Torr. & Gray | Trifolium depauperatum var. amplectens | Fabaceae
|
| TRANA2 | Trifolium andersonii Gray ssp. andersonii | fiveleaf clover | Fabaceae
|
| TRANB | Trifolium andersonii Gray ssp. beatleyae J. Gillett | Beatley's clover | Fabaceae
|
| TRANM | Trifolium andersonii Gray ssp. monoense (Greene) J. Gillett | Mono clover | Fabaceae
|
| TRANB2 | Trifolium andersonii Gray var. beatleyae (J. Gillett) Isely | Trifolium andersonii ssp. beatleyae | Fabaceae
|
| TRANF2 | Trifolium andersonii Gray var. friscanum Welsh | Trifolium friscanum | Fabaceae
|
| TRANM2 | Trifolium andersonii Gray var. monoense (Greene) Isely | Trifolium andersonii ssp. monoense | Fabaceae
|
| TRAN | Trifolium andersonii Gray | fiveleaf clover | Fabaceae
|
| TRANA3 | Trifolium andinum Nutt. var. andinum | Intermountain clover | Fabaceae
|
| TRANP | Trifolium andinum Nutt. var. podocephalum Barneby | Intermountain clover | Fabaceae
|
| TRAN2 | Trifolium andinum Nutt. | Intermountain clover | Fabaceae
|
| TRAN9 | Trifolium anemophilum Greene | Trifolium dasyphyllum ssp. anemophilum | Fabaceae
|
| TRAN6 | Trifolium angustifolium L. | narrowleaf crimson clover | Fabaceae
|
| TRAP | Trifolium appendiculatum Loja. | Trifolium variegatum | Fabaceae
|
| TRAR5 | Trifolium arcuatum Piper | Trifolium eriocephalum ssp. arcuatum | Fabaceae
|
| TRAR7 | Trifolium arizonicum Greene | Trifolium mucronatum ssp. lacerum | Fabaceae
|
| TRAR4 | Trifolium arvense L. | rabbitfoot clover | Fabaceae
|
| TRAT2 | Trifolium atrorubens (Greene) House | Trifolium longipes ssp. atrorubens | Fabaceae
|
| TRAT | Trifolium attenuatum Greene | Rocky Mountain clover | Fabaceae
|
| TRAU2 | Trifolium aureum Pollich | golden clover | Fabaceae
|
| TRBAA | Trifolium barbigerum Torr. var. andrewsii Gray | Andrews' clover | Fabaceae
|
| TRBAB | Trifolium barbigerum Torr. var. barbigerum | bearded clover | Fabaceae
|
| TRBA | Trifolium barbigerum Torr. | bearded clover | Fabaceae
|
| TRBA5 | Trifolium barnebyi (Isely) Dorn & Lichvar | Trifolium haydenii var. barnebyi | Fabaceae
|
| TRBE2 | Trifolium beckwithii Brewer ex S. Wats. | Beckwith's clover | Fabaceae
|
| TRBE3 | Trifolium bejariense Moric. | Bejar clover | Fabaceae
|
| TRBI3 | Trifolium bicephalum Elmer | Trifolium macraei | Fabaceae
|
| TRBID | Trifolium bifidum Gray var. decipiens Greene | Trifolium bifidum | Fabaceae
|
| TRBI | Trifolium bifidum Gray | notchleaf clover | Fabaceae
|
| TRBO3 | Trifolium bolanderi Gray | parasol clover | Fabaceae
|
| TRBR9 | Trifolium bracteolatum Rydb. | Trifolium attenuatum | Fabaceae
|
| TRBR2 | Trifolium brandegeei S. Wats. | Brandegee's clover | Fabaceae
|
| TRBR3 | Trifolium breweri S. Wats. | forest clover | Fabaceae
|
| TRBU3 | Trifolium buckwestiorum Isley | Santa Cruz clover | Fabaceae
|
| TRCA26 | Trifolium calcaricum Collins & Wieboldt | running glade clover | Fabaceae
|
| TRCA5 | Trifolium campestre Schreb. | field clover | Fabaceae
|
| TRCA6 | Trifolium carolinianum Michx. | Carolina clover | Fabaceae
|
| TRCA16 | Trifolium catalinae S. Wats. | Trifolium macraei | Fabaceae
|
| TRCA15 | Trifolium caurinum Piper | Trifolium longipes ssp. caurinum | Fabaceae
|
| TRCE9 | Trifolium cernuum Brot. | nodding clover | Fabaceae
|
| TRCI | Trifolium ciliolatum Benth. | foothill clover | Fabaceae
|
| TRCOA | Trifolium columbianum Greene var. argillorum Jepson | Trifolium albopurpureum | Fabaceae
|
| TRCOO | Trifolium columbianum Greene var. olivaceum (Greene) Jepson | Trifolium olivaceum | Fabaceae
|
| TRCO10 | Trifolium columbianum Greene | Trifolium albopurpureum | Fabaceae
|
| TRCO11 | Trifolium covillei House | Trifolium longipes ssp. caurinum | Fabaceae
|
| TRCY | Trifolium cyathiferum Lindl. | cup clover | Fabaceae
|