| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| TRAT3 | Tremolecia atrata (Ach.) Hertel | disc lichen | Hymeneliaceae
|
| TRJU2 | Tremolecia jurana (Schaerer) Hertel | Farnoldia jurana | Porpidiaceae
|
| TRMI12 | Tremolecia micropsis (A. Massal.) Hertel | Farnoldia micropsis | Porpidiaceae
|
| TRNI5 | Tremolecia nivalis (Anzi) Hertel | Farnoldia micropsis | Porpidiaceae
|
| TREMO | Tremolecia Choisy | disc lichen | Hymeneliaceae
|
| TRAE2 | Trepocarpus aethusae Nutt. ex DC. | whitenymph | Apiaceae
|
| TREPO | Trepocarpus Nutt. ex DC. | trepocarpus | Apiaceae
|
| TRFR | Triadenum fraseri (Spach) Gleason | Fraser's marsh St. Johnswort | Clusiaceae
|
| TRLO4 | Triadenum longifolium Small | Triadenum tubulosum | Clusiaceae
|
| TRPE12 | Triadenum petiolatum (Walt.) Britt. | Triadenum walteri | Clusiaceae
|
| TRTUW | Triadenum tubulosum (Walt.) Gleason var. walteri (J.G. Gmel.) Cooperrider | Triadenum walteri | Clusiaceae
|
| TRTU | Triadenum tubulosum (Walt.) Gleason | lesser marsh St. Johnswort | Clusiaceae
|
| TRVIF | Triadenum virginicum (L.) Raf. ssp. fraseri (Spach) J. Gillett | Triadenum fraseri | Clusiaceae
|
| TRVIF2 | Triadenum virginicum (L.) Raf. var. fraseri (Spach) Cooperrider | Triadenum fraseri | Clusiaceae
|
| TRVI2 | Triadenum virginicum (L.) Raf. | Virginia marsh St. Johnswort | Clusiaceae
|
| TRWA | Triadenum walteri (J.G. Gmel.) Gleason | greater marsh St. Johnswort | Clusiaceae
|
| TRIAD | Triadenum Raf. | marsh St. Johnswort | Clusiaceae
|
| TRSE6 | Triadica sebifera (L.) Small | tallowtree | Euphorbiaceae
|
| TRIAD2 | Triadica Loureiro | tallowtree | Euphorbiaceae
|
| TRGL5 | Triantha glutinosa (Michx.) Baker | Tofieldia glutinosa ssp. glutinosa | Liliaceae
|
| TROCB | Triantha occidentalis (S. Wats.) Gates ssp. brevistyla (C.L. Hitchc.) Packer | Tofieldia glutinosa ssp. brevistyla | Liliaceae
|
| TROC7 | Triantha occidentalis (S. Wats.) Gates | Tofieldia glutinosa ssp. occidentalis | Liliaceae
|
| TRRA6 | Triantha racemosa (Walt.) Small | Tofieldia racemosa | Liliaceae
|
| TRPO2 | Trianthema portulacastrum L. | desert horsepurslane | Aizoaceae
|
| TRIAN | Trianthema L. | trianthema | Aizoaceae
|
| TRCI2 | Tribulus cistoides L. | Jamaican feverplant | Zygophyllaceae
|
| TRTE | Tribulus terrestris L. | puncturevine | Zygophyllaceae
|
| TRIBU | Tribulus L. | punturevine | Zygophyllaceae
|
| TRWA2 | Tricardia watsonii Torr. ex S. Wats. | threehearts | Hydrophyllaceae
|
| TRICA | Tricardia Torr. ex S. Wats. | tricardia | Hydrophyllaceae
|
| TRVA3 | Tricera vahlii (Baill.) Britt. | Buxus vahlii | Buxaceae
|
| TRPH3 | Tricerma phyllanthoides (Benth.) Lundell | Maytenus phyllanthoides | Celastraceae
|
| TRTE5 | Tricerma texana (Lundell) Lundell | Maytenus phyllanthoides | Celastraceae
|
| TRAF | Trichachne affinis Swallen | Digitaria similis | Poaceae
|
| TRCA17 | Trichachne californica (Benth.) Chase | Digitaria californica | Poaceae
|
| TREG2 | Trichachne eggersii (Hack.) Henr. | Digitaria eggersii | Poaceae
|
| TRHI7 | Trichachne hitchcockii (Chase) Chase | Digitaria hitchcockii | Poaceae
|
| TRIN8 | Trichachne insularis (L.) Nees | Digitaria insularis | Poaceae
|
| TRNU | Trichachne nutans (L.) Baum | Digitaria insularis | Poaceae
|
| TRPA14 | Trichachne patens Swallen | Digitaria patens | Poaceae
|
| TRAM12 | Trichantha ambigua (Urban) Wiehler | Columnea ambigua | Gesneriaceae
|
| TRCR11 | Tricharia cretacea Vezda | | Gomphillaceae
|
| TRME8 | Tricharia melanothrix Fee | Tricharia santessonii | Gomphillaceae
|
| TRSA8 | Tricharia santessonii D. Hawksw. | | Gomphillaceae
|
| TRVE4 | Tricharia vezdae W. R. Buck | | Gomphillaceae
|
| TRICH16 | Tricharia Fee | tricharia | Gomphillaceae
|
| TREM | Trichilia emetica Vahl | Trichilia roka | Meliaceae
|
| TRHI3 | Trichilia hirta L. | broomstick | Meliaceae
|
| TRPA2 | Trichilia pallida Sw. | gaita | Meliaceae
|
| TRRO9 | Trichilia roka (Forsskal) Chiov. | trichilia | Meliaceae
|
| TRTR8 | Trichilia triacantha Urban | bariaco | Meliaceae
|
| TRICH2 | Trichilia P. Br. | trichilia | Meliaceae
|
| TRBO4 | Trichipteris borinquena (Maxon) R. Tryon | Cyathea borinquena | Cyatheaceae
|
| TRPR6 | Trichipteris procera (Willd.) R. Tryon | Cyathea pungens | Cyatheaceae
|
| TRCR9 | Trichloris crinita (Lag.) Parodi | Chloris crinita | Poaceae
|
| TRME5 | Trichloris mendocina (Phil.) Kurtz | Chloris crinita | Poaceae
|
| TRPL3 | Trichloris pluriflora Fourn. | Chloris pluriflora | Poaceae
|
| TRAU12 | Trichocereus auricolor Backeb. | | Cactaceae
|
| TRCA31 | Trichocereus callianthus F. Ritter | | Cactaceae
|
| TRCA32 | Trichocereus candicans (Salm-Dyck) Britton & Rose | Echinopsis candicans | Cactaceae
|
| TRGR17 | Trichocereus grandiflorus Backeb. | | Cactaceae
|
| TRPA27 | Trichocereus pasacanus (F.A.C. Weber) Friedrich & G.D. Rowley | Echinopsis pasacana | Cactaceae
|
| TRPE24 | Trichocereus peruvianus Britton & Rose | | Cactaceae
|
| TRUY | Trichocereus uyupampensis Backeb. | | Cactaceae
|
| TRICH26 | Trichocereus (A. Berger) Riccob. | trichocereus | Cactaceae
|
| TRTO5 | Trichocolea tomentella (Ehrh.) Dumort. | | Trichocoleaceae
|
| TRICH12 | Trichocolea Dumort. nom. cons. | | Trichocoleaceae
|
| TRRI7 | Trichocoronis riparia (Greene) Greene | river bugheal | Asteraceae
|
| TRRI6 | Trichocoronis rivularis Gray | Rio Grande bugheal | Asteraceae
|
| TRWR2 | Trichocoronis wrightii (Torr. & Gray) Gray | limestone bugheal | Asteraceae
|
| TRICH4 | Trichocoronis Gray | bugheal | Asteraceae
|
| TRBO9 | Trichodon borealis Williams | Trichodon cylindricus var. oblongus | Ditrichaceae
|
| TRCYC | Trichodon cylindricus (Hedw.) Schimp. var. cylindricus | trichodon moss | Ditrichaceae
|
| TRCYO | Trichodon cylindricus (Hedw.) Schimp. var. oblongus (Lindb.) Podp. | trichodon moss | Ditrichaceae
|
| TRCY6 | Trichodon cylindricus (Hedw.) Schimp. | trichodon moss | Ditrichaceae
|
| TRICH13 | Trichodon Schimp. | trichodon moss | Ditrichaceae
|
| TRRE8 | Tricholaena repens (Willd.) A.S. Hitchc. | Melinis repens | Poaceae
|
| TRRO7 | Tricholaena rosea Nees | Melinis repens | Poaceae
|
| TRNID | Tricholepis nigrescens (Hedw.) Grout var. donnellii (Aust.) Grout | Papillaria nigrescens | Meteoriaceae
|
| TRNI7 | Tricholepis nigrescens (Hedw.) Grout | Papillaria nigrescens | Meteoriaceae
|
| TRAL3 | Trichomanes alatum Sw. | winged bristle fern | Hymenophyllaceae
|
| TRAN4 | Trichomanes angustifrons (F�e) W. Boer | royal bristle fern | Hymenophyllaceae
|
| TRBA2 | Trichomanes baldwinii (D.C. Eat.) Copeland | Trichomanes bauerianum | Hymenophyllaceae
|
| TRBA3 | Trichomanes bauerianum Endl. | Bauer's bristle fern | Hymenophyllaceae
|
| TRBO | Trichomanes boschianum Sturm | Appalachian bristle fern | Hymenophyllaceae
|
| TRCA10 | Trichomanes capillaceum L. | treetrunk bristle fern | Hymenophyllaceae
|
| TRCR3 | Trichomanes crispum L. | crisped bristle fern | Hymenophyllaceae
|
| TRCY2 | Trichomanes cyrtotheca Hbd. | elegant bristle fern | Hymenophyllaceae
|
| TRDA | Trichomanes davallioides Gaud. | kilau | Hymenophyllaceae
|
| TRDR | Trichomanes draytonianum Brack. | Hawai'i bristle fern | Hymenophyllaceae
|
| TRHO3 | Trichomanes holopterum Kunze | entirewing bristle fern | Hymenophyllaceae
|
| TRHO4 | Trichomanes hookeri K. Presl | Hooker's bristle fern | Hymenophyllaceae
|
| TRHY4 | Trichomanes hymenoides Hedw. | parchment bristle fern | Hymenophyllaceae
|
| TRHY2 | Trichomanes hymenophylloides Bosch | thinleaf bristle fern | Hymenophyllaceae
|
| TRIN13 | Trichomanes intricatum Farrar | weft fern | Hymenophyllaceae
|
| TRKA | Trichomanes kapplerianum Sturm | Kappler's bristle fern | Hymenophyllaceae
|
| TRKR | Trichomanes krausii Hook. & Grev. | treemoss bristle fern | Hymenophyllaceae
|
| TRLI | Trichomanes lineolatum (Bosch) Hook. | lined bristle fern | Hymenophyllaceae
|
| TRME4 | Trichomanes membranaceum L. | scale edge bristle fern | Hymenophyllaceae
|
| TRMI9 | Trichomanes minutum Blume | tiny bristle fern | Hymenophyllaceae
|
| TROV3 | Trichomanes ovale (Fourn.) W. Boer | eggleaf bristle fern | Hymenophyllaceae
|