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| Tabebuia | aurea, cassinoides, nodosa, roseo-alba |
| Tabernaemontana | catharinensis |
| Taccarum | peregrinum, weddellianum |
| Tachigali | aurea, denudata, paratyensis |
| Taeniatherum | caput-medusae |
| Tagetes | argentina, biflora, campanulata, filifolia, iltisiana, imbricata, laxa, minuta, mirandae, multiflora, ostenii, pauciloba, praetermissa, riojana, rupestris, terniflora |
| Talinum | fruticosum, nocturnum, paniculatum, polygaloides, porphyreum |
| Talipariti | pernambucense |
| Talisia | angustifolia, esculenta |
| Tamarix | chinensis, gallica, parviflora, ramosissima |
| Tamonea | curassavica var. cardenasii |
| Tanacetum | balsamita, parthenium, vulgare |
| Tanaecium | cyrtanthum, dichotomum, pyramidatum, selloi, tetramerum |
| Tapeinia | pumila |
| Tapirira | guianensis |
| Taquara | micrantha |
| Tara | spinosa |
| Tarasa | alberti, antofagastana, capitata, congestiflora, heterophylla, humilis, latearistata, martiniana, meyeri, odonellii, operculata, pediculata, reichei, tarapacana, tenella, trisecta, umbellata, urbaniana |
| Taraxacum | angustisquameum, copidophyllum, duplidentifrons, fernandezianum, gilliesii, laevigatum, marklundii, officinale, patagonicum, plumbeum, stictophyllum, vatisectum |
| Tarenaya | aculeata, bicolor, cordobensis, crenopetala, diffusa, eosina, guaranitica, houtteana, inermis, lilloi, longicarpa, parviflora, psoraleifolia, rosea, titubans, trachycarpa, tucumanensis |
| Tassadia | berteroana, obovata |
| Tecoma | capensis, fulva ssp. fulva, fulva ssp. garrocha, stans var. stans, stans var. velutina, tenuiflora |
| Tecophilaea | cyanocrocus, violiflora f. violiflora, violiflora f. polyantha |
| Tectaria | buchtienii, incisa, pilosa |
| Teesdalia | nudicaulis |
| Telmatoblechnum | serrulatum |
| Temnadenia | odorifera, violacea |
| Tephrocactus | alexanderi, aoracanthus, articulatus var. oligacanthus, articulatus f. papyracanthus, articulatus var. articulatus, aulacothele, aulacothele ssp. deminutus, geometricus, halophilus, molinensis |
| Tephrosia | adunca, chaquenha, cinerea, fertilis, guaranitica, hassleri, marginata |
| Teramnus | uncinatus |
| Terminalia | argentea, australis, catappa, glabrescens, kleinii, triflora |
| Ternstroemia | atlantica, brasiliensis, congestiflora |
| Terpsichore | chrysleri |
| Tessaria | absinthioides, ambigua, dodoneifolia ssp. dodoneifolia, dodoneifolia ssp. plucheoides, fastigiata, integrifolia |
| Tetilla | hydrocotylifolia |
| Tetracera | oblongata, parviflora, sellowiana, volubilis |
| Tetrachondra | patagonica |
| Tetraglochin | alata var. alata, andina, caespitosa, clarazii, cristata, inermis |
| Tetragonia | angustifolia, copiapina, crystallina, espinosae, macrocarpa, maritima, microcarpa, ovata, pedunculata, tetragonoides |
| Tetrapanax | papyrifer |
| Tetrapollinia | caerulescens |
| Tetrapterys | ambigua, catarinensis, crispa, hassleriana, jussieuana, mollis, mucronata, phlomoides, salicifolia, xylosteifolia |
| Tetrastylidium | grandifolium |
| Tetroncium | magellanicum |
| Tetrorchidium | dusenii, rubrivenium |
| Teucrium | bicolor, cubense, nudicaule, scorodonia, vesicarium |
| Thalia | geniculata, multiflora |
| Thalictrum | decipiens, venturii |
| Thamnoseris | lacerata f. obtusifolia, lacerata f. lacerata |
| Thaumatocaryon | dasyanthum, tetraquetrum |
| Thaumatophyllum | bipinnatifidum, corcovadense, lundii, petraeum, tweedieanum, undulatum |
| Thelesperma | megapotamicum |
| Thelocephala | esmeraldana, glabrescens, krausii, napina, odieri, tenebrica, weisseri |
| Thelypteris | browniana, confluens, lugubris, patens var. dissimilis, rioverdensis |
| Themeda | quadrivalvis |
| Thesium | aphyllum, brasiliensis |
| Thespesia | populnea |
| Thevetia | bicornuta, peruviana |
| Thinopyrum | ponticum |
| Thinouia | compressa, mucronata, paraguayensis, ventricosa |
| Thismia | cordata, prataensis |
| Thlaspi | arvense |
| Thryallis | brachystachys, laburnum |
| Thunbergia | alata, fragans, grandiflora |
| Thymophylla | pentachaeta |
| Thyrsacanthus | boliviensis, sulcatus |
| Thyrsopteris | elegans |
| Tibouchina | asperior, chamissoana, clavata, regnellii, rojasii var. robusta |
| Tigridia | philippiana, riedemanniae |
| Tilesia | baccata |
| Tillandsia | x cornissaensis, aëranthos, afonsoana, aizoides, albertiana, andicola, angulosa, arequitae, argentina, arhiza, australis, bandensis ssp. bandensis, bandensis ssp. grandipetala, bella, bergeri, brealitoensis, buchlohii, caliginosa, capillaris, castellanii, chasmophyta, colorata, crocata, diaguitensis, didisticha, dorotheae, dura, duratii var. saxatilis, duratii var. duratii, erecta, esseriana, friesii, funebris, gardneri, geissei, geminiflora, genseri, gilliesii ssp. polysticha, gilliesii ssp. gilliesii, guelzii, hirta, itaubensis, ixioides ssp. viridiflora, ixioides ssp. ixioides, jonesii, jucunda, landbeckii, leonamiana, leucopetala, linearis, loliacea, lorentziana, mallemontii, marconae, markusii, mereliana, minutiflora, mollis var. reptans, montana, muhriae, myosura, pedicellata, peiranoi var. alba, peiranoi var. peiranoi, pfeufferi, pohliana, polystachia, polzii, porongoensis, pseudomontana, ramellae, rectangula, recurvata, recurvifolia, reichenbachii, retorta, rohdenardini, rosarioae, schreiteri, seideliana, sphaerocephala var. sphaerocephala, sphaerocephala var. tarijensis, streptocarpa, stricta var. disticha, stricta var. stricta, tenebra, tenuifolia var. vaginata, tenuifolia var. glaucifolia, tenuifolia var. tenuifolia, toropiensis, tragophoba, tricholepis, uruguayensis, usneoides, vernicosa, violaceiflora, virescens, winkleri, witeckii, xiphioides var. tafiensis, xiphioides var. xiphioides, xiphioides var. minor, zecheri var. zecheri, zecheri f. brealitoensis, zecheri var. cafayatensis |
| Tinantia | erecta |
| Tipuana | tipu |
| Tiquilia | atacamensis, grandiflora, litoralis, nuttallii, paronychioides, tacnensis |
| Tithonia | diversifolia, rotundifolia, tubiformis |
| Tocoyena | formosa, sellowiana |
| Tolpis | barbata |
| Tomostima | australis |
| Tontelea | micrantha, miersii |
| Topea | micrantha, patens |
| Tordylium | maximum |
| Torenia | thouarsii |
| Torilis | arvensis, nodosa |
| Toulicia | tomentosa |
| Tournefortia | bicolor, gardneri, membranacea, salicifolia |
| Tourrettia | lappacea |
| Tovomitopsis | paniculata |
| Trachycarpus | fortunei |
| Trachypogon | macroglossus, spicatus |
| Trachypteris | pinnata |
| Tradescantia | ambigua, boliviana, catharinensis, cerinthoides, chrysophylla, crassula, cymbispatha, fluminensis, insularis, multibracteata, mundula, pallida, schwirkowskiana, serrana, seubertiana, spathacea, tenella, tucumanensis, umbraculifera, valida, zanonia, zebrina |
| Tragia | bahiensis, caperonioides, chlorocaulon, dodencandra, friesii, geraniifolia, giardelli, hassleriana, hieronymi, incana, melochioides, paxii, pinnata, polyandra, uberabana var. uberabana, uberabana var. discolor, volubilis |
| Tragopogon | dubius, porrifolius, pratensis |
| Tragus | andicola, australianus, berteronianus, racemosus |
| Traubia | modesta |
| Trema | micrantha |
| Trembleya | parviflora, phlogiformis |
| Tressensia | viridis |
| Trevoa | quinquenervia |
| Trianthema | argentinum, portulacastrum |
| Tribeles | australis |
| Tribulus | terrestris |
| Trichanthecium | caaguazuense, cyanescens, parvifolium, pseudisachne, schwackeanum, wettsteinii |
| Trichilia | casaretti, catigua, claussenii, elegans, hirta, lepidota ssp. schumanniana, lepidota ssp. lepidota, pallens, pallida, pseudostipularis, silvatica, stellato-tomentosa, tetrapetala |
| Trichocentrum | fuscum, morenoi, pumilum |
| Trichocereus | andalgalensis, angelesii, arboricola, atacamensis, bolligerianus, cabrerae, candicans, chiloensis ssp. panhoplites, chiloensis ssp. chiloensis, chiloensis ssp. australis, chiloensis ssp. eburneus, deserticola, fabrisii, faundezii, glaucus f. pendens, hahnianus, huascha var. huascha, huascha var. pecheretianus, lamprochlorus, pectiniferus, pseudocandicans, rowleyi, schickendantzii, skottsbergii, smrzianus, spinibarbis, strigosus, tarijensis, terscheckii, thelegonoides, thelegonus, undulosus, uyupampensis, vatteri |
| Trichocline | aurea, auriculata var. breviscapa, auriculata var. auriculata, boecheri, catharinensis, caulescens, cineraria, cisplatina, dealbata, deserticola, exscapa, heterophylla, humilis, incana, linearifolia, macrocephala, macrorhiza, maxima, minuana, plicata, reptans, sinuata, speciosa |
| Trichogonia | chodatii, hassleri, phlebodes, rhodotricha, salviifolia |
| Trichogoniopsis | adenantha |
| Trichomanes | anadromum, cristatum, elegans, lucens, mosenii, pellucens, pilosum, polypodioides, serratifolium |
| Trichoneura | weberbaueri |
| Trichopetalum | chosmalensis, plumosum |
| Trichophorum | rigidum |
| Trichosalpinx | montana, violacea |
| Trichostigma | octandrum |
| Trichotolinum | deserticola |
| Tricomaria | usillo |
| Tridax | paraguayensis, procumbens |
| Tridens | brasiliensis, hackelii, nicorae, riograndensis |
| Trifolium | amabile var. hemsleyi, amabile var. amabile, angustifolium, antucoense, arvense, aureum, campestre, cernuum, chilense, depauperatum, dubium, fragiferum ssp. bonanni, fragiferum ssp. fragiferum, glomeratum, hatschbachii, hybridum var. anatolicum, hybridum var. hybridum, incarnatum, lappaceum, macraei, microdon, pallidum, physanthum, polymorphum var. polymorphum, polymorphum var. neuquenense, polymorphum var. grandiflorum, pratense, repens, resupinatum, riograndense ssp. riograndense, riograndense ssp. pseudocalyculatum, spadiceum, squamosum, striatum, subterraneum, suffocatum, tomentosum, triaristatum, vernum, vestitum |
| Triglochin | concinna, maritima, palustris, scilloides, striata |
| Trigonella | monspeliaca |
| Trigonia | boliviana, nivea var. pubescens, nivea var. nivea |
| Trigonidium | latifolium, macranthum, obtusum |
| Trihesperus | glaucus |
| Trimezia | martinicensis, spathata ssp. martii, spathata ssp. grandis |
| Triodanis | perfoliata var. biflora |
| Triphora | hassleriana, santamariensis |
| Triplaris | americana, gardneriana |
| Tripleurospermum | inodorum |
| Tripodanthus | acutifolius, flagellaris |
| Tripogandra | diuretica, glandulosa, multiflora, purpurascens ssp. australis |
| Tripogon | ekmanii, nicorae |
| Tripogonella | spicata |
| Tripsacum | australe |
| Triptilion | achilleae, benaventei, berteroi, capillatum, cordifolium, gibbosum, spinosum |
| Trisetum | caudulatum, flavescens, longiglume var. glabratum |
| Tristachya | leiostachya |
| Tristagma | ameghinoi, anemophilum, berteroi, bivalve, circinatum, gracile, graminifolium, nivale f. nivale, nivale f. australe, patagonicum, poeppigianum, porrifolium, sessile, staminosum, violaceum |
| Tristerix | aphyllus, corymbosus, verticillatus |
| Tristicha | trifaria |
| Trithrinax | brasiliensis var. brasiliensis, brasiliensis var. acanthocoma, campestris, schizophylla var. biflabellata, schyzophylla var. schyzophylla |
| Triumfetta | bogotensis, guaranitica, rhomboidea, semitriloba |
| Trixis | cacalioides, divaricata ssp. discolor, divaricata ssp. divaricata, glaziovii, grisebachii, hassleri, lessingii, nobilis, ophiorhiza ssp. ophiorhiza, ophiorhiza ssp. glandulifera, pallida, praestans, proustioides, spicata, thyrsoidea |
| Trizeuxis | falcata |
| Troncosoa | seriphioides |
| Tropaeolum | argentinum, atrocapillare, austropurpureum, azureum, beuthii, brachyceras, brasiliense, capillare, ciliatum ssp. septentrionale, ciliatum ssp. ciliatum, hookerianum ssp. hookerianum, hookerianum ssp. pilosum, incisum, jilesii, kingii, leptophyllum ssp. gracile, leptophyllum ssp. leptophyllum, looseri, majus, meyeri, myriophyllum, nuptae-jucundae, patagonicum, pentaphyllum ssp. pentaphyllum, pentaphyllum ssp. megapetaloides, polyphyllum, porifolium, rhomboideum, sanctae-catharinae, sessilifolium, slanisii, speciosum, trialatum, tricolor, tuberosum ssp. silvestre, warmingianum, willinkii |
| Tropidocarpum | lanatum |
| Tropidococcus | pinnatipartitus |
| Tryonia | areniticola, myriophylla |
| Tunilla | chilensis, corrugata, tilcarensis |
| Turnera | aurelii, blanchetiana var. subspicata, concinna, dolichostigma, fernandezii, grandidentata, grandiflora, hassleriana, hilaireana, krapovickasii, melochioides, nervosa, oblongifolia, orientalis, pumilea, serrata var. brevifolia, sidoides ssp. integrifolia, sidoides ssp. sidoides, sidoides ssp. holosericea, sidoides ssp. carnea, sidoides ssp. pinnatifida, subulata, weddelliana |
| Tweedia | andina, aucaensis, birostrata, brunonis, echegarayi, stipitata |
| Tynanthus | cognatus, labiatus, micranthus |
| Typha | angustifolia, domingensis, latifolia, subulata |
| Typhonium | roxburghii |
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