| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| THHI2 | Thelypteris hildae Proctor | limestone maiden fern | Thelypteridaceae
|
| THHIH | Thelypteris hispidula (Dcne.) C.F. Reed var. hispidula | roughhairy maiden fern | Thelypteridaceae
|
| THHII | Thelypteris hispidula (Dcne.) C.F. Reed var. inconstans (C. Christens.) Proctor | roughhairy maiden fern | Thelypteridaceae
|
| THHIV | Thelypteris hispidula (Dcne.) C.F. Reed var. versicolor (R. St. John) Lellinger | roughhairy maiden fern | Thelypteridaceae
|
| THHI | Thelypteris hispidula (Dcne.) C.F. Reed | roughhairy maiden fern | Thelypteridaceae
|
| THHU | Thelypteris hudsoniana (Brack.) C.F. Reed | Pneumatopteris hudsoniana | Thelypteridaceae
|
| THIN3 | Thelypteris inabonensis Proctor | cordillera maiden fern | Thelypteridaceae
|
| THIN14 | Thelypteris �incesta W.H. Wagner | | Thelypteridaceae
|
| THIN2 | Thelypteris interrupta (Willd.) K. Iwats. | Willdenow's maiden fern | Thelypteridaceae
|
| THIN4 | Thelypteris �invisa (Sw.) Proctor (pro sp.) | | Thelypteridaceae
|
| THKU | Thelypteris kunthii (Desv.) Morton | Kunth's maiden fern | Thelypteridaceae
|
| THLE2 | Thelypteris leptocladia (F�e) Proctor | thicket maiden fern | Thelypteridaceae
|
| THLI9 | Thelypteris limbosperma auct. non (All.) Fuchs | Thelypteris quelpaertensis | Thelypteridaceae
|
| THLI5 | Thelypteris �lindheimeri (C. Christens.) Wherry | Thelypteris ovata var. lindheimeri | Thelypteridaceae
|
| THLI2 | Thelypteris linkiana (K. Presl) R. Tryon | Link's maiden fern | Thelypteridaceae
|
| THMA7 | Thelypteris macilenta E. St. John | Thelypteris hispidula var. versicolor | Thelypteridaceae
|
| THMA6 | Thelypteris macrorhizoma E. St. John | Thelypteris kunthii | Thelypteridaceae
|
| THME2 | Thelypteris megalodus (Schkuhr) Proctor | Thelypteris pennata | Thelypteridaceae
|
| THNA | Thelypteris namophila Proctor | Maricao maiden fern | Thelypteridaceae
|
| THNE2 | Thelypteris nephrodioides (Klotzsch) Proctor | graygreen maiden fern | Thelypteridaceae
|
| THNE | Thelypteris nevadensis (Baker) Clute ex Morton | Sierra marsh fern | Thelypteridaceae
|
| THNOH | Thelypteris normalis (C. Christens.) Moxley var. harperi (C. Christens.) Wherry | Thelypteris ovata var. ovata | Thelypteridaceae
|
| THNO2 | Thelypteris normalis (C. Christens.) Moxley | Thelypteris kunthii | Thelypteridaceae
|
| THNO | Thelypteris noveboracensis (L.) Nieuwl. | New York fern | Thelypteridaceae
|
| THOL | Thelypteris oligophylla (Maxon) Proctor | Thelypteris invisa | Thelypteridaceae
|
| THOP | Thelypteris opposita (Vahl) Ching | oppositeleaf maiden fern | Thelypteridaceae
|
| THOP2 | Thelypteris opulenta (Kaulfuss) Fosberg | jeweled maiden fern | Thelypteridaceae
|
| THOVL | Thelypteris ovata R. St. John var. lindheimeri (C. Christens.) A.R. Sm. | Lindheimer's marsh fern | Thelypteridaceae
|
| THOVO | Thelypteris ovata R. St. John var. ovata | ovate marsh fern | Thelypteridaceae
|
| THOV | Thelypteris ovata R. St. John | ovate marsh fern | Thelypteridaceae
|
| THPA13 | Thelypteris �palmeri W.H. Wagner | | Thelypteridaceae
|
| THPAH | Thelypteris palustris Schott var. haleana Fern. | Thelypteris palustris var. pubescens | Thelypteridaceae
|
| THPAP | Thelypteris palustris Schott var. pubescens (Lawson) Fern. | eastern marsh fern | Thelypteridaceae
|
| THPA | Thelypteris palustris Schott | eastern marsh fern | Thelypteridaceae
|
| THPA4 | Thelypteris parasitica (L.) Fosberg | parasitic maiden fern | Thelypteridaceae
|
| THPAS | Thelypteris patens (Sw.) Small ex R. St. John var. scabriuscula (K. Presl) A.R. Sm. | Thelypteris patens | Thelypteridaceae
|
| THPA5 | Thelypteris patens (Sw.) Small ex R. St. John | gridscale maiden fern | Thelypteridaceae
|
| THPE2 | Thelypteris pennata (Poir.) Morton | graceful maiden fern | Thelypteridaceae
|
| THPH | Thelypteris phegopteris (L.) Slosson | Phegopteris connectilis | Thelypteridaceae
|
| THPI2 | Thelypteris piedrensis (C. Christens.) Morton | Cuban maiden fern | Thelypteridaceae
|
| THPIA | Thelypteris pilosa (Mart. & Gal.) Crawford var. alabamensis Crawford | Alabama maiden fern | Thelypteridaceae
|
| THPI3 | Thelypteris pilosa (Mart. & Gal.) Crawford | softhairy maiden fern | Thelypteridaceae
|
| THPO5 | Thelypteris poiteana (Bory) Proctor | darkgreen maiden fern | Thelypteridaceae
|
| THPUS | Thelypteris puberula (Baker) Morton var. sonorensis A.R. Sm. | Sonoran maiden fern | Thelypteridaceae
|
| THPU | Thelypteris puberula (Baker) Morton | showy maiden fern | Thelypteridaceae
|
| THQUI | Thelypteris quadrangularis (F�e) Schelpe var. inconstans (C. Christens.) A.R. Sm. | Thelypteris hispidula var. inconstans | Thelypteridaceae
|
| THQUV | Thelypteris quadrangularis (F�e) Schelpe var. versicolor (R. St. John) A.R. Sm. | Thelypteris hispidula var. versicolor | Thelypteridaceae
|
| THQU2 | Thelypteris quelpaertensis (Christ) Ching | queen's-veil maiden fern | Thelypteridaceae
|
| THRE6 | Thelypteris reducta Small ex R. St. John | Thelypteris dentata | Thelypteridaceae
|
| THRER | Thelypteris reptans (J.F. Gmel.) Morton var. reptans | creeping maiden fern | Thelypteridaceae
|
| THRET | Thelypteris reptans (J.F. Gmel.) Morton var. tenera (F�e) Proctor | creeping maiden fern | Thelypteridaceae
|
| THRE3 | Thelypteris reptans (J.F. Gmel.) Morton | creeping maiden fern | Thelypteridaceae
|
| THRE4 | Thelypteris resinifera (Desv.) Proctor | resinous maiden fern | Thelypteridaceae
|
| THRE5 | Thelypteris reticulata (L.) Proctor | latticevein fern | Thelypteridaceae
|
| THRE8 | Thelypteris retroflexa (L.) Proctor & Lourteig | spleenwort maiden fern | Thelypteridaceae
|
| THRH2 | Thelypteris rheophyta Proctor | Rio Inabon maiden fern | Thelypteridaceae
|
| THRO2 | Thelypteris �rolandii (C. Christens.) R. Tryon | | Thelypteridaceae
|
| THRU | Thelypteris rudis (Kunze) Proctor | red maiden fern | Thelypteridaceae
|
| THSAP | Thelypteris sancta (L.) Ching var. portoricensis (C. Christens.) Morton | Thelypteris sancta | Thelypteridaceae
|
| THSA3 | Thelypteris sancta (L.) Ching | Caribbean maiden fern | Thelypteridaceae
|
| THSA4 | Thelypteris saxatilis R. St. John | Thelypteris kunthii | Thelypteridaceae
|
| THSC | Thelypteris sclerophylla (Poepp. ex Spreng.) Morton | stiff maiden fern | Thelypteridaceae
|
| THSE2 | Thelypteris serra (Sw.) R. St. John | Jamaican maiden fern | Thelypteridaceae
|
| THSE3 | Thelypteris serrata (Cav.) Alston | toothed latticevein fern | Thelypteridaceae
|
| THSI2 | Thelypteris simulata (Davenport) Nieuwl. | bog fern | Thelypteridaceae
|
| THSP2 | Thelypteris sprengelii (Kaulfuss) Proctor | Thelypteris balbisii | Thelypteridaceae
|
| THTE5 | Thelypteris tetragona (Sw.) Small | freetip maiden fern | Thelypteridaceae
|
| THTH | Thelypteris thelypterioides (Michx.) Holub | Thelypteris noveboracensis | Thelypteridaceae
|
| THTO | Thelypteris torresiana (Gaud.) Alston | Macrothelypteris torresiana | Thelypteridaceae
|
| THTO2 | Thelypteris totta (Thunb.) Schelpe | Thelypteris interrupta | Thelypteridaceae
|
| THUN | Thelypteris unca R. St. John | Thelypteris kunthii | Thelypteridaceae
|
| THVE2 | Thelypteris verecunda Proctor | Barrio Charcas maiden fern | Thelypteridaceae
|
| THVE4 | Thelypteris versicolor R. St. John | Thelypteris hispidula var. versicolor | Thelypteridaceae
|
| THWA | Thelypteris wailele T. Flynn | Waioli Valley maiden fern | Thelypteridaceae
|
| THYA | Thelypteris yaucoensis Proctor | Puerto Rico maiden fern | Thelypteridaceae
|
| THELY2 | Thelypteris Schmidel | maiden fern | Thelypteridaceae
|
| THAR2 | Themeda arguens (L.) Hack. | Christmas grass | Poaceae
|
| THFR4 | Themeda ?frondosa (R. Br.) Merr. | Themeda arguens | Poaceae
|
| THGI | Themeda gigantea auct. non (Cav.) Hack. | Themeda villosa | Poaceae
|
| THQU | Themeda quadrivalvis (L.) Kuntze | kangaroo grass | Poaceae
|
| THVI2 | Themeda villosa (Poir.) A. Camus | silky kangaroo grass | Poaceae
|
| THEME | Themeda Forsk. | kangaroo grass | Poaceae
|
| THAN3 | Theobroma angustifolium Mocino & Sesse ex DC. | theobroma | Sterculiaceae
|
| THBI2 | Theobroma bicolor Humb. & Bonpl. | theobroma | Sterculiaceae
|
| THCAC | Theobroma cacao L. ssp. cacao | cacao | Sterculiaceae
|
| THCAS | Theobroma cacao L. ssp. sphaerocarpum (A. Chev.) Cuatrec. | cacao | Sterculiaceae
|
| THCA | Theobroma cacao L. | cacao | Sterculiaceae
|
| THGR7 | Theobroma grandiflorum (Willd. ex Sprengel) Schumann | theobroma | Sterculiaceae
|
| THLE5 | Theobroma leiocarpum Bernoulli | Theobroma cacao ssp. cacao | Sterculiaceae
|
| THMA10 | Theobroma mammosum Cuatrec. & Leon | theobroma | Sterculiaceae
|
| THPE6 | Theobroma pentagonum Bernoulli | Theobroma cacao ssp. cacao | Sterculiaceae
|
| THSA8 | Theobroma sativa (Aublet) Lign. & Le Bey | Theobroma cacao ssp. cacao | Sterculiaceae
|
| THSI4 | Theobroma simiarum J. D. Smith | theobroma | Sterculiaceae
|
| THSP4 | Theobroma sphaerocarpum A. Chev. | Theobroma cacao ssp. sphaerocarpum | Sterculiaceae
|
| THEOB | Theobroma L. | theobroma | Sterculiaceae
|
| THAR7 | Thermopsis arenosa A. Nels. | Thermopsis rhombifolia | Fabaceae
|
| THAR3 | Thermopsis argentata Greene | Thermopsis californica var. argentata | Fabaceae
|
| THCAA | Thermopsis californica S. Wats. var. argentata (Greene) C.J. Chen & B.L. Turner | California goldenbanner | Fabaceae
|
| THCAC2 | Thermopsis californica S. Wats. var. californica | California goldenbanner | Fabaceae
|
| THCAS2 | Thermopsis californica S. Wats. var. semota (Jepson) C.J. Chen & B.L. Turner | California goldenbanner | Fabaceae
|
| THCA4 | Thermopsis californica S. Wats. | California goldenbanner | Fabaceae
|