| |
| Sabicea | villosa |
| Sabulina | acutiflora |
| Saccharum | angustifolium, asperum, balansae, giganteum, intermedium, trinii |
| Sacciolepis | myuros, vilvoides |
| Saccoloma | catharinae, distans, elegans, inaequale |
| Sacoila | argentina, duseniana, hassleri, lanceolata, pedicellata |
| Sageretia | elegans |
| Sagina | apetala var. apetala, chilensis, humifusa, procumbens |
| Sagittaria | guayanensis, montevidensis ssp. chilensis, montevidensis ssp. montevidensis, rhombifolia |
| Salacia | crassifolia, elliptica, grandifolia |
| Salicornia | ambigua, andina, magellanica, neei, pulvinata |
| Salimenaea | integrifolia |
| Salix | alba, babylonica, caprea, fragilis, humboldtiana var. humboldtiana, humboldtiana var. martiana, viminalis |
| Salmea | scandens |
| Salmonopuntia | schickendantzii |
| Salpichlaena | papyrus, volubilis |
| Salpichroa | origanifolia, ramosissima, scandens, tristis var. tristis, tristis var. lehmanni |
| Salpiglossis | sinuata, spinescens |
| Salpinga | margaritacea |
| Salsola | kali var. hirsuta, kali var. kali, tragus |
| Salta | triflora |
| Salvia | aliciae, arenaria, aridicola, atrocyanea, borjensis, brevipes, caaguazuensis, calolophos, campicola, cardiophylla, coccinea, congestiflora, cordata, curta, cuspidata ssp. gilliesii, exserta, guaranitica, hilarii, lachnostachys, melissiflora, microphylla, minarum, nervosa, officinalis, ovalifolia var. ovalifolia, ovalifolia var. villosa, ovalifolia var. nitidula, pachypoda, pallida, paraguariensis, personata, procurrens, propinqua, reflexa, regnelliana, rhombifolia, rosmarinoides, scoparia, segtinophylla, splendens, stachydifolia, subrotunda, tenuiflora, tubiflora, uliginosa, verbenaca |
| Salvinia | auriculata var. major, biloba, herzogii, minima, molesta, radula |
| Samanea | tubulosa |
| Sambucus | australis, nigra ssp. nigra, peruviana |
| Samolus | latifolius, repens, spathulatus, subnudicaulis, valerandi |
| Sanderella | discolor, riograndensis |
| Sanguisorba | minor |
| Sanicula | crassicaulis, graveolens |
| Santalum | fernandezianum |
| Sanvitalia | versicolor |
| Sapindus | saponaria |
| Sapium | glandulosum, haematospermum, obovatum |
| Saponaria | officinalis |
| Saranthe | eichleri, leptostachya, ustulata |
| Sarcocornia | perennis |
| Sarcodraba | andina, dusenii, karraikensis, subterranea |
| Sarcoglottis | acaulis, alexandri, biflora, catharinensis, fasciculata, glaucescens, grandiflora, heringeri, homalogastra, itararensis, juergensii, tirolensis, uliginosa, ventricosa |
| Sarcomphalus | joazeiro, mistol |
| Sarcorhachis | schwackei |
| Sarcotoxicum | salicifolium |
| Sarmienta | scandens |
| Satureja | hortensis |
| Sauroglossum | andinum, elatum, nitidum, sellilabre |
| Sauvagesia | capillaris, erecta, racemosa, vellozii |
| Savia | dictyocarpa |
| Saxegothaea | conspicua |
| Saxifraga | bicuspidata, magellanica, umbrosa |
| Saxifragodes | albowiana |
| Scabiosa | atropurpurea |
| Scaevola | plumierii |
| Scandix | pecten-veneris |
| Scaphyglottis | brasiliensis, emarginata, modesta |
| Sceptridium | australe, negeri, schaffneri |
| Schaefferia | argentinensis |
| Schaueria | capitata, paranaensis |
| Schedonorus | pratensis |
| Schenkia | spicata |
| Schickendantziella | trichosepala |
| Schindleria | densiflora |
| Schinopsis | balansae, boqueronensis, brasiliensis, cornuta, glabra, heterophylla, lorentzii |
| Schinus | areira, bumelioides, engleri var. engleri, engleri var. uruguayensis, fasciculata, ferox, gracilipes, huyngan var. subtridentata, johnstonii, kauselii, latifolia, lentiscifolia, longifolia var. paraguariensis, longifolia var. longifolia, marchandii, molle var. molle, molle var. rusbyi, montana, myrtifolia, odonellii, pampeana, patagonica var. crenuloidea, patagonica var. patagonica, pearcei, pilifera var. pilifera, pilifera var. boliviensis, pilifera var. cabrerae, polygama, praecox, ramboi, roigii, sinuata, spinosa, talampaya, terebinthifolia var. terebinthifolia, terebinthifolia var. rhoifolia, terebinthifolia var. pohliana, terebinthifolia var. acutifolia, venturii, weinmannifolia var. dubia, weinmannifolia var. hassleri, weinmannifolia var. riedeliana, weinmannifolia var. weinmannifolia |
| Schismus | arabicus, barbatus |
| Schistocarpha | eupatorioides |
| Schizachyrium | angustispiculatum, bimucronatum, brevifolium, condensatum, glaziovii, gracilipes, hatschbachii ssp. saltense, hatschbachii ssp. hatschbachii, lactiflorum, microstachyum, paucispiculatum, plumigerum, salzmannii var. aristatum, salzmannii var. salzmannii, sanguineum, scabriflorum, spicatum, tenerum var. hirtiglume, tenerum var. tenerum |
| Schizaea | elegans, fistulosa, fluminensis |
| Schizanthus | alpestris, candidus, carlomunozii var. carlomunozii, carlomunozii var. dilutimaculatus, coccineus var. -, fallax, grahamii, hookeri, integrifolius, lacteus, laetus, litoralis var. litoralis, litoralis var. humilis, nutantiflorus, parvulus, pinnatus, porrigens ssp. borealis, porrigens ssp. porrigens, splendens |
| Schizolobium | parahyba |
| Schizopetalon | arcuatum, bipinnatifidum, biseriatum, brachycarpum, corymbosum, dentatum, maritimum, rupestre, tenuifolium, walkeri |
| Schkuhria | pinnata |
| Schlechtendalia | luzulifolia |
| Schlegelia | parviflora |
| Schnella | angulosa, microstachya |
| Schoenoplectiella | mucronata, supina |
| Schoenoplectus | americanus, californicus var. tereticulmis, californicus var. spoliatus, californicus var. californicus, pungens var. pungens, pungens var. badius, pungens var. longispicatus, tabernaemontani |
| Schoenus | andinus, antarcticus, lymansmithii, nigricans, rhynchosporoides |
| Schoepfia | brasiliensis, lucida |
| Schreiteria | macrocarpa |
| Schultesia | australis, guianensis, heterophylla |
| Schwartzia | brasiliensis |
| Schweiggeria | fruticosa |
| Schwenckia | americana var. angustifolia, americana var. americana, curviflora, grandiflora, juncoides, volubilis |
| Schwendenera | tetrapyxis |
| Sciaphila | schwackeana |
| Scirpus | angustisquamis, chubutensis, melanocaulos, spegazzinianus |
| Scleranthus | annuus, polycarpos |
| Scleria | bracteata, ciliata, colorata, composita, cuyabensis, distans, filiculmis, flagellum-nigrorum, gaertneri, georgiana ssp. australis, hirtella, lacustris, latifolia, leptostachya, longigluma, macrophylla, microcarpa, mitis, myricocarpa, obtusa, panicoides, plusiophylla, reticularis, scabra, schiedeana, secans, sellowiana, uleana, variegata, virgata |
| Sclerochloa | dura |
| Sclerophylax | adnatifolia, arnottii, caducifructus, cocuccii, cuyanus, cynocrambe, difulvioi, hunzikeri, kurtzii, lorentzianus, ruiz-lealii, spinescens, tenuicaulis, trispermus |
| Scleropogon | brevifolius |
| Scolymus | hispanicus |
| Scoparia | aemilii, dulcis, elliptica, ericacea, hassleriana, montevidensis, nudicaulis, pentapetala, pinnatifida, plebeja |
| Scorzonera | laciniata |
| Scrophularia | auriculata, peregrina |
| Scutellaria | eplingii, nummulariifolia, platensis, purpurascens, racemosa, uliginosa, valdiviana, woodii |
| Scutia | arenicola, buxifolia |
| Scuticaria | hadwenii |
| Scybalium | fungiforme |
| Scyphanthus | elegans |
| Sebastiania | argutidens, commersoniana, klotzschiana, longispicata, pachyphylla, pusilla, ramosissima, schottiana, serrata, subsessilis, subulata, ypanemensis |
| Secondatia | densiflora |
| Securidaca | diversifolia, lanceolata, macrocarpa, ovalifolia, rivinifolia |
| Sedum | acre, cymatopetalum, jujuyense, mexicanum |
| Seemannia | gymnostoma, nematanthodes, sylvatica |
| Seguieria | americana, langsdorffii, paraguayensis |
| Selaginella | apoda, contigua, convoluta, decomposita, erectifolia, flexuosa, kraussiana, macrostachya, marginata, microphylla, muscosa, novae-hollandiae, pallescens, parviarticulata, peruviana, producta, sellowii, suavis, sulcata, tenuissima, valida, vogelii, willdenowii |
| Selenicereus | anthonyanus, setaceus, undatus |
| Selkirkia | berteroi, limense, pauciflora |
| Sellocharis | paradoxa |
| Semialarium | paniculatum |
| Senecio | × lulioi, achalensis, adamantinus, adenophyllus, adenotrichius, adrianicus, alcicornis, algens, alloeophyllus var. glaberrimus, alloeophyllus var. alloephyllus, almeidae, altoandinus, ambatensis, ameghinoi, anconquijae f. discoideus, anconquijae f. anconquijae, angulatus, angustissimus, anthemidiphyllus, antofagastanus, apensis, aquaticus ssp. aquaticus, aquaticus ssp. barbareifolius, aquilaris, arechavaletae, argillosus, argophylloides var. rupestris, argophylloides var. argophylloides, argyreus, aristianus, arleguianus, arnicoides, arnottii, aspericaulis, asplenifolius, atacamensis, australandinus, baccharidifolius, bahioides, balsamicus, barbarae, barrosianus, beaufilsii, belenensis, benaventianus, bergii, berteroi, boelckei, bonariensis, brachylobus, bracteolatus var. luteus, bracteolatus var. valderramae, bracteolatus var. bracteolatus, brasiliensis var. incanus, brasiliensis var. brasiliensis, brasiliensis var. tripartitus, bravensis, breviscapus, bridgesii, brunonianus, buglossus, burkartii, bustillosianus var. bustillosianus, cachinalensis var. cachinalensis, cachinalensis var. copiapinus, cajonensis, calchaquinus, calcicola, calingastensis, calocephalus, canchahuinganquensis, candidans, candollei, caparoënsis, carbonensis, catamarcensis, ceratophylloides, cerberoanus var. lanatus, cerberoanus var. cerberoanus, chamomillifolius, chañaralensis, chilensis f. discoideus, chilensis var. chilensis, chilensis var. argophyllus, chillanensis, chionophilus, chipauquilensis, chrysanthemum var. chrysanthemum, chrysanthemum var. discoideus, chrysocomoides, chrysolepis, cisplatinus, clarioneifolius, clivicola var. pampae, clivicola var. clivicola, coluhuapiensis, comberi, conyzaefolius, coquimbensis, corcovadensis, coronopodiphyllus, corrugatus, coscayanus, covasii, covuncensis, crassiflorus var. maritimus, crassiflorus var. crassiflorus, crassiflorus var. subceratophyllus, cremeiflorus, cremnicola, cremnophilus, crepidifolius, crithmoides, crusoei, cryptocephalus, ctenophyllus, cumingii var. bracteosus, cumingii var. cumingii, cuneatus, cylindrocephalus, darwinii, davilae, deferens, delicatulus, depressus, desideratus, diaguita, dichotomus, diemii, digitatus, divaricoides, donianus, dryophyllus, eightsii, elquiensis, ephemerus, eriocladus, eriophyton, erraticus, eruciformis var. brachycephalus, eruciformis var. eruciformis, espinosae, evacoides, evenius, expansus, fabrisii, falklandicus, famatinensis, farinifer, ferruglii, festucoides, filaginoides var. lobulatus, filaginoides var. filaginoides, fistulosus var. fistulosus, fistulosus var. ochroleucus, flagellifolius, fragantissimus, friesii, ganganensis, garaventai, gayanus, gilliesii var. gilliesii, glabratus, glandulifer, glanduloso-hirtellus, glandulosus, gnidioides var. gnidioides, goldsackii, grandis, grandjotii, grindeliifolius, grossidens, guatulamensis, gunckelii, haenkeanus, haenkei, hakeifolius var. vidalii, hakeifolius var. hakeifolius, haloragis var. glandulosus, haloragis var. haloragis, hatcherianus, helgae, hemmendorffii, heteroschizus, heterotrichus, hickenii, hieracium, hieronymi, hilairianus, hirsutulus, hirtus, hjertingii, hoehnei, hualtaranensis, huitrinicus, humifusus, humillimus, icoglossoides, icoglossus var. icoglossus, icoglossus var. splendens, illapelinus, illinitus, infimus, invalidus, irgangii, isernii, jacobeiformis, jaffuelii, jarae, jilesii, jobii, johnstonianus, jorquerae, jujuyensis, julianus, jungei, jürgensii, kakeifolius, keshua, kingii var. kingii, krapovickasii, kunturinus, laetevirens, laevicaulis, landbeckii, langei, lanifer, lanosissimus, laseguei, lastarrianus, leptocaulos, leptolobus, leptoschizus, leucomallus var. leucomallus, leucopeplus, leucophyton, leucostachys var. leucostachys, leucostachys var. schreiteri, leucus, lilloi, linaresensis, linariifolius var. linariifolius, linariifolius var. subtomentosus, linariifolius var. aclonetus, linariifolius var. heliophytoides, linearilobus, lithostaurus, looseri, lorentziella, lorentzii, maculatus, madagascariensis, madariagae, maeviae, magellanicus, manguensis, mapuche, martinensis, masafuerae, masatierrae, mattfeldianus, maulinus, megaoreinus, melanopotamicus, mesembrynus, microphyllus, micropifolius, microtis, minutifolius, miser, montevidensis, monttianus, munnozii, murinus, murorum, myriophyllus, neaei var. neaei, neaei var. incisus, nemiae, niederleinii, nigrescens, nublensis, nutans, obesus, obtectus, octolepis var. saltensis, octolepis var. octolepis, odonellii, oleosus, oligoleucus, oligophyllus, oreinus, oreophyton, ostenii var. balaenicus, ostenii var. ostenii, otaeguianus, otites, otopterus, oxyphyllus, pachyphyllos, pampeanus, pappii, paraguariensis, parodii, patagonicus var. patagonicus, patagonicus var. andersonii, patagonicus var. alyssoides, patagonicus var. lobatifolius, paucidentatus var. paucidentatus, paucidentatus var. limbardioides, paulensis, pelquensis, pemehuensis, pentaphyllus, perezii f. perezii, peteroanus, petrophyus, pfisteri, philippicus, philippii, phylicifolius, pichineuquensis var. albus, pichineuquensis var. pichineuquensis, pilquensis, pinachensis, pinnatus var. simplicifolius, pinnatus var. pinnatus, pissisi, planiflorus, platensis, poeppigii var. poeppigii, poeppigii var. discoideus, pogonias, polygaloides, polyphyllus, portalesianus var. lanuginosus, portalesianus var. portalesianus, portulacoides, potosianus, prenanthifolius, promatensis, proteus var. proteus, proteus var. geissei, pseudalmeidae, pseudaspericaulis, pseuderucoides, pseudodepressus, pseudotites, pterophorus, pubescens, puchei, pulcher f. pulcher, pulcher f. albiflorus, pulicarioides var. auriculatus, pulicarioides var. pulicarioides, pumilus, punae, pycnanthus, pygmophyllus, ragonesei, rahmeri var. rahmeri, rahmeri var. sericeus, ramboanus, rauchii, reedi, reicheanus, reitzianus, renjifoanus, repollensis, retanensis, ricardii, riograndensis, riojanus var. riojanus, riojanus var. radiatus, rodolfoi, rudbeckiiefolius, rufescens, ruiz-lealii, saltensis, sanagastae, sandwithii, santelicis, santiagoensis, saxicola, schoenemannii, schyzotus, scopulorum, scorzonerifolius, sectilis, segethii, selloi, sericeonitens, serratifolius, sinuatilobus, skottsbergii var. skottsbergii, skottsbergii var. anomalus, smithii, socompae, sorianoi, spinosus, steparius, stigophlebius, subarnicoides, subauritus, subdiscoideus, subpanduratus, subpubescens, subulatus var. subulatus, subulatus var. erectus, subulatus var. salsus, subumbellatus var. subumbellatus, subumbellatus var. microcephalus, sundtii, sylvaticus, tacorensis, tacuaremboensis, talquinus, tandilensis, tehuelches, thurifer, tilcarensis, tinctolobus, tocomarensis, toconaoensis, tocornali, toroanus, trafulensis, tricephalus, trichocaulon, trichocodon, tricuspidatus var. dentatus, tricuspidatus var. dumosus, tricuspidatus var. tricuspidatus, trifidus, trifurcatus, trifurcifolius, triodon var. neuquensis, triodon var. triodon, tripinnatifidus, tristis, troncosii, tucumanensis, tweediei, uspallatensis, vaginatus, varvarcensis var. pinnatus, varvarcensis var. varvarcensis, ventanensis, vervoorstii, vira-vira, virens, viridis var. viridis, viridis var. radiatus, viscosissimus, volckmannii var. pinohachense, volckmannii var. volckmannii, vulgaris, websteri, werdermannii, westermanii, xerophilus var. deserticola, xerophilus var. xerophilus, yalae, zapahuirensis, zapalae, zosterifolius |
| Senega | adenophylla, appendiculata, argentinensis, aspalatha, australis, boliviensis, bonariensis, brasiliensis, corralitae, cyparissias, darwiniana, desiderata, duarteana, gnidioides, guaranitica, hieronymi, jujuyensis, kurtzii, lancifolia, laxiflora, linoides, longicaulis, mendocina, minima, molluginifolia, moquiniana, nevadensis, obovata, paniculata, patagonica, payuniensis, persistens, philippiana, pulchella, punctata, resedoides, rosei, sabuletorum, salasiana, santacruzensis, spinescens, stenophylla, subandina, timoutoides, ventanensis |
| Senegalia | bonariensis, catharinensis, emilioana, etilis, fiebrigii, gilliesii, grandistipula, harleyi, hatschbachii, hoehnei, lacerans, lowei, magnibracteosa, martii, martiusiana, monacantha , multipinnata, nitidifolia, parviceps, polyphylla, praecox , rafinesqueana, recurva, riparia, tenuifolia, tucumanensis, velutina |
| Senna | acanthoclada, aculeata, alata, angulata var. miscadena, aphylla var. aphylla, araucarietorum, arnottiana, birostris var. jallaguensis, birostris var. arequipensis, birostris var. hookeriana, brongniartii, burkartiana, candolleana, cernua, chloroclada, corymbosa, crassiramea, cruckshanksii, cumingii var. cumingii, cumingii var. eremobia, cumingii var. alcaparra, cumingii var. coquimbensis, hilariana, hirsuta var. leptocarpa, hirsuta var. streptocarpa, hirsuta var. hirta, hirsuta var. puberula, huidobriana, kurtzii, leiophylla, macranthera, morongii, mucronifera, multijuga var. peregrinatrix, multijuga ssp. lindleyana, nana, neglecta, nudicaulis, oblongifolia, obtusifolia, occidentalis, organensis var. extratropica, pachyrrhiza var. pachyrrhiza, pachyrrhiza var. pendula, paposana, paradictyon, pendula var. missionum, pendula var. recondita, pendula var. glabrata, pendula var. paludicola, pendula var. eriocarpa, pilifera var. subglabra, pilifera var. pilifera, pilifera var. tubata, rugosa, scabriuscula, septemtrionalis, siamea, silvestris var. guaranitica, silvestris var. unifaria, silvestris var. silvestris, spectabilis, spiniflora, splendida, stipulacea var. stipulacea, stipulacea var. anglorum, subulata, tenuifolia, tropica, urmenetae, velutina |
| Serjania | acoma, altissima, ampelopsis, caracasana, cissoides, clematidifolia, communis var. glabra, communis var. communis, confertiflora f. subincana, cuspidata, decemstriata, erecta, eriocarpa, foveata, fuscifolia, glabrata, gracilis, hatschbachii, hebecarpa, herteri, incana, laruotteana, leptocarpa, lethalis, longistipula, mansiana, marginata, meridionalis, minutiflora, monogyna, multiflora, neei, orbicularis, paranensis, perulacea var. krapovickasii, perulacea var. perulacea, perulacea var. chacoensis, piscatoria, punctulata, reticulata, sufferruginea, tripleuria, tristis, unidentata |
| Serpocaulon | australe, catharinae, fraxinifolium, laetum, lasiopus, latipes, latissimum, meniscifolium, polystichum, rex, triseriale, vacillans |
| Sesbania | bispinosa, exasperata, macroptera, punicea, sesban var. sesban, sesban var. bicolor, virgata |
| Seseli | libanotis |
| Sessea | regnellii, vestioides |
| Sesuvium | americanum, humifusum, mezianum, portulacastrum, sessile |
| Setaria | alonsoi, cordobensis, fiebrigii, geminata, globulifera, hassleri, hunzikeri, italica, lachnea, leucopila, macrostachya, magna, megaphylla, mendocina, nicorae, oblongata, palmifolia, pampeana, paraguayensis, parodii, parviflora var. parviflora, parviflora var. pilosissima, parviflora var. brachytricha, paucifolia, pflanzii, pumila, rosengurtii var. uruguayensis, rosengurtii var. rosengurtii, scabrifolia, scandens, setosa, sphacelata var. sericea, sphacelata var. anceps, stolonifera, sulcata, tenax, vaginata var. vaginata, vaginata var. tandilensis, vaginata var. bonariensis, verticillata, verticilliformis, viridis, vulpiseta var. vulpiseta, vulpiseta var. reversipila |
| Setiechinopsis | mirabilis |
| Sherardia | arvensis |
| Sibara | anethifolia, dilloniorum, macrostachya, mendocina, pinnata, tehuelches |
| Sibthorpia | conspicua, repens |
| Sicydium | gracile, nereoi |
| Sicyos | baderoa var. baderoa, baderoa var. ambrosianus, edulis, ignarus, kunthii, malvifolius, odonelli, polyacanthus, warmingii var. warmingii, warmingii var. longispinus |
| Sida | adrianopolitana, albiflora, ambatense, anomala, argentina var. argentina, argentina var. tucumanensis, ascendens, bordasiana, cabreriana, calchaquiensis, caudata, centuriata, cerradoensis, charpinii, ciliaris, confusa, cordifolia, cristobaliana, dictyocarpa, dubia, dureana, elliotti, emilei, esperanzae, farroupilhensis, ferrucciana, glaziovii, glomerata, gracillima, hassleri, hatschbachii, honoriana, ignaciana, jussiaeana, kelleri, kranzii, lilianae, linearifolia, linifolia, lonchitis, loretana, monteiroi, nemorensis, palustris, paradoxa, parva, pedersenii, pindapoyensis, planicaulis, poeppigiana, potentilloides, pseudocymbalaria, pseudopotentilloides var. manresana, ramoniana, regnellii, reitzii, rhizomatosa, rhombifolia, riedelii, rodrigoi, rubifolia, rufescens, rupicola, salviifolia var. submutica, santaremensis, saraviae, schumanniana, setosa, spinosa, tapiraguensis, tressensiae, tuberculata var. pseudorhombifolia, tuberculata var. tuberculata, urens, variegata, vespertina, viarum |
| Sidastrum | micranthum, multiflorum, paniculatum |
| Sideroxylon | obtusifolium |
| Sigesbeckia | orientalis, serrata |
| Sigmoidotropis | speciosa |
| Silene | andicola, antarctica, antirrhina var. divaricata, antirrhina var. antirrhina, argentina, argentinensis, armeria, bersieri, chubutensis, coronaria, densifolia, dioica, echegarayi, filifolia, gallica, haumanii var. haumanii, haumanii var. densa, magellanica, mandonii, margaritae, melanopotamica ssp. melanopotamica, patagonica, pendula, pratensis, vulgaris |
| Silybum | marianum |
| Simira | corumbensis, paraguayensis, sampaioana |
| Simsia | dombeyana |
| Sinapis | alba, arvensis |
| Sinningia | aggregata, allagophylla, amambayensis, bullata, calcaria, canescens, conspicua, cooperi, curtiflora, douglasii, elatior, eumorpha, gerdtiana, hatschbachii, leopoldii, leucotricha, lineata, lutea, macropoda, macrostachya, mauroana, nivalis, polyantha, ramboi, reitzii, sellowii, tubiflora, warmingii, x vacariensis |
| Siolmatra | brasiliensis |
| Sipanea | hispida |
| Siparuna | bifida, guianensis |
| Siphanthera | cordata |
| Siphocampylus | argentinus, baccae, betulaefolius, convolvulaceus, densidentatus, duploserratus, fiebrigii, fimbriatus, fluminensis, foliosus, fulgens, longepedunculatus, lycioides, macropodus, nebularis, nemoralis, orbignianus, sevegnaniae, sulphureus, umbellatus, verticillatus, yerbalensis |
| Siphoneugena | crassifolia, guilfoyleiana, occidentalis, reitzii |
| Sisymbrium | altissimum, austriacum, erysimoides, irio, officinale, orientale, runcinatum |
| Sisyrinchium | alatum, albilapidense, andinopatagonicum, annuum, antemeridianum, arenarium ssp. adenostemon, arenarium ssp. arenarium, avenaceum, azureum, balansae, biflorum, brasiliense, brevipes, bromelioides ssp. bromelioides, bromelioides ssp. angustius, caetanum, calathinum, caratuvense, chilense ssp. chilense, chilense ssp. macranthum, ciliolatum, claritae, coalitum, commutatum ssp. commutatum, congestum, cuspidatum, cylindrocarpium, dasypathum ssp. glabrum, dasypathum ssp. dasyspathum, decumbens, densiflorum, deseadense, diversicarpum, elegantulum, exilifolium, fasciculatum ssp. fasciculatum, fiebrigii, flabellatum, foliosum, glaziovii, graminifolium, hasslerianum, hirsutum, hoehnei, humahuacense, humidum, humile, hypsophilum, igatimiense, iguazuanum, incurvatum, jamesonii, latiusculum, laxum, luzula, macrocarpum, marchioides, megapotamicum, micranthum, minus ssp. everrucosum, minus ssp. minus, minutiflorum, nanum, nembyense, nidulare, ostenianum, oxyspathum, pachyrhizum ssp. pachyrhizum, pachyrhizum ssp. procerum, pachyrhizum ssp. pertenue, pachyrhizum ssp. columellosum, pachyrhizum f. cyaneum, palmifolium ssp. palmifolium, palmifolium ssp. fuscoviride, pampeanum, patagonicum, paucispathum, pearcei, pendulum, pictum, platense, platycaule, plicatulum, purpurellum ssp. purpurellum, rambonis, rectilineum, reitzii, restioides, rigidifolium, rosengurttii, scalarium, scariosum, schottii, sectiandrum, sellowianum, setaceum, sinuosum, soboliferum, somuncurense, striatum, subnudum, subtile, tafiense, teleanthum, tinctorium, trichospatum, tucumanum, uliginosum, unguiculatum, vaginatum ssp. marchio, vaginatum ssp. vaginatum, weirii, wettsteinii |
| Sium | latifolium |
| Skeptrostachys | arechavaletanii, balanophorostachya, berroana, congestiflora, correana, disoides, gigantea, montevidensis, paraguayensis, rupestris |
| Skytanthus | acutus |
| Sloanea | garckeana, guianensis, hatschbachii, hirsuta ssp. australis, hirsuta ssp. hirsuta, lasiocoma |
| Smallanthus | araucariophilus, connatus, macroscyphus, riograndensis, siegesbeckia |
| Smilax | assumptionis, campestris, cognata, elastica, fluminensis, goyazana, lappacea, larvata, pilcomayensis, polyantha, quinquenervia, rufescens, staminea, stenophylla |
| Soda | inermis |
| Solanum | abutiloides, acaule, aculeatissimum, adscendens, adspersum, aenictum, affine, alatirameum, albidum, aligerum, aloysiifolium, alphonsei, alternatopinnatum, americanum, amygdalifolium, angustifidum, annuum, anoacanthum, apaense, aparadense, apiahyense, arenarium, argenteum, argentinum, aridum, atropurpureum, berthaultii, betaceum, bistellatum, boliviense, bonariense, brachyantherum, brevicaule, brevipedunculatum, bullatum, caavurana, caesium, calileguae, campaniforme, canoasense, capsicoides, cassioides, castaneum, chacoense, chamaesarachidium, chenopodioides, chilense, cinnamomeum, cochabambense, commersonii, compressum, comptum, concarense, concinnum, confusum, consimile, coquimbense, corumbense, corymbiflorum ssp. mortoniana, corymbiflorum ssp. corymbiflorum, crispum, cylindricum, decompositiflorum, delicatulum, delitescens, didymum, diploconos, echegarayi, elaeagnifolium, endoadenium, etuberosum, euacanthum, excisirhombeum, fernandezianum, fiebrigii, flaccidum, fragile, furcatum, fusiforme, gaudichaudii, gertii, gilioides, glandulosipilosum, glaucophyllum, gnaphalocarpon, granulosoleprosum, guaraniticum, hasslerianum, hastatilobum, heleonastes, herbabona, hieronymi, hirtellum, hoehnei, homalospermum, huayavillense, hunzikeri, incarceratum, indivisum, infundibuliforme, inodorum, julocrotonoides, juvenale, kleinii, kurtzianum, lacerdae, laxum, luridifuscescens, lycocarpum, lycopersicoides, maglia, malmeanum, marginatum, marmoratum, matadori, maturecalvans, mauritianum, medians, megalochiton, melissarum, microdontum, montanum, mortonii, multispinum, neei, neorossii, nigrum, nitidibaccatum, nitidum, odoriferum, olympicum, opacum, pabstii, palinacanthum, palitans, palustre, paniculatum, paposanum, paranense, pedersenii, pelagicum, pennellii var. elachistus, pentlandii ssp. interandinum, pentlandii var. pentlandii, peruvianum, physalidicalyx, physalifolium, pilcomayense, piluliferum, pimpinellifolium, pinetorum, pinnatum, platense, platycypellon, polyphyllum, premnifolium, profusum, pseudocapsicum, pseudodaphnopsis, pseudoquina, pygmaeum, radicans, ramulosum, reductum, reflexum, reineckii, reitzii, remyanum, riparium, robustum, rostratum, rufescens, salamancae, saldanhae, salicifolium, sanctae-catharinae, sanfurgoi, sarrachoides, schlechtendalianum, schwackeanum, sciadostylis, scuticum, seaforthianum, sellowianum, setosissimum, sinuatiexcisum, sinuatirecurvum, sisymbriifolium, sitiens, stipulatum, stuckertii, subsylvestris, swartzianum, symmetricum, tenuispinum, tiinae, toldense, torvum, trachytrichium, trichoneuron, triflorum, trinominum, tripartitum, tuberosum, tucumanense, turneroides, tweedianum, uncinellum, vaillantii, valdiviense, variabile, velleum, venturii, vernei, viarum, viscosissimum, wacketii, weddellii, x aemulans, x brucheri, x rechei, zuloagae |
| Solaria | curacavina, miersioides |
| Soleirolia | soleirolii |
| Solenomelus | pedunculatus, segethii |
| Solidago | argentinensis, chilensis, microglossa, patagonica, virgaurea |
| Soliva | anthemifolia, macrocephala, sessilis, stolonifera, triniifolia |
| Sommerfeltia | cabrerae, spinulosa |
| Sonchus | arvensis, asper, berteroanus, brassicifolius, lobatiflorus, marginatus, micranthus, neriifolius, oleraceus, phoeniciformis, pruinatus, regius, sinuatus, splendens, tenerrimus |
| Sophora | cassioides, fernandeziana var. fernandeziana, fernandeziana var. reedeana, linearifolia, macrocarpa, masafuerana, rhynchocarpa, tomentosa ssp. tomentosa, tomentosa ssp. littoralis |
| Sorbus | aucuparia |
| Sorghastrum | balansae, minarum, nutans, pellitum, scaberrimum, setosum, stipoides, viride |
| Sorghum | almum, bicolor, halepense var. halepense, halepense var. muticum |
| Sorocea | bonplandii, hilarii, jureiana, saxicola |
| Sparattosperma | leucanthum |
| Sparaxis | bulbifera, tricolor |
| Spartium | junceum |
| Spathantheum | orbignyanum |
| Spathicarpa | hastifolia, lanceolata |
| Specklinia | fernandiana, grobyi, guimaraensii, marginalis, subpicta |
| Speea | humilis |
| Spegazziniophytum | patagonicum |
| Spergula | arvensis, calva, grandis |
| Spergularia | aberrans, arbuscula, bocconei, cerviana, confertiflora, cremnophila, denticulata, depauperata, diandra, dillenii, fasciculata, floribunda, levis, manicata, marina, masafuerana, media, pissisii, platensis, pycnantha, ramosa, rubra, rupestris, stenocarpa, villosa |
| Spermacoce | affinis, capitata, confusa, eryngioides, multiflora, ostenii, prostrata, riparia, viridiflora |
| Spermolepis | castellanosii |
| Sphaeralcea | australis, bonariensis, brevipes, chenopodifolia, cordobensis, crispa, decipiens, laciniata, mendocina, miniata, obtusiloba, philippiana, purpurata, tehuelches |
| Sphaerophysa | salsula |
| Sphaeropteris | gardneri |
| Sphagneticola | brachycarpa, trilobata |
| Sphenoclea | zeylanica |
| Sphinctanthus | hasslerianus |
| Spigelia | andina, beyrichiana, blanchetiana, caaguazuensis, catarinensis, flemmingiana, hatschbachii, insignis, kleinii, martiana, nicotianaeflora, paraguariensis, pusilla, riedeliana, rojasiana, scabra, stenophylla, tetraptera, valenzuelae var. valenzuelae, vestita |
| Spilanthes | leiocarpa, nervosa, paraguayensis, urens |
| Spinoliva | ilicifolia ssp. ilicifolia, ilicifolia ssp. baccharoides |
| Spiraea | cantoniensis, douglasii |
| Spirodela | intermedia |
| Spirotheca | rivieri var. passifloroides, rivieri var. rivieri |
| Sporobolus | × longispicus, aeneus var. eximius, aeneus var. aeneus, aeneus var. angustifolia, alterniflorus, ciliatus, coarctatus, cryptandrus, densiflorus, indicus var. indicus, indicus var. andinus, linearifolius, maximus, mendocinus, metallicolus, monandrus, multinodis, phleoides, platensis, pseudairoides, pyramidalis, pyramidatus, rigens var. expansa, rigens var. rigens, rigens var. atacamensis, spartinus, virginicus |
| Stachycephalum | argentinum |
| Stachys | albicaulis, arvensis, bridgesii, eremicola, gilliesii, grandidentata, macraei, ochroleuca, pannosa, philippiana, sericea, truncata |
| Stachytarpheta | cayennensis, fiebrigii, gesnerioides, hassleri, indica, paraguariensis |
| Staelia | juarezii, nelidae, thymoides, virgata var. virgata |
| Stangea | paulae, rhizantha |
| Stanhopea | insignis, lietzei, xytriophora |
| Stapfochloa | berroi, canterae, ciliata, elata, grandiflora, parodiana, parvispicula |
| Staurogyne | alba, eustachya, mandioccana, sylvatica |
| Steinchisma | decipiens, hians, laxa, spathellosum |
| Steiropteris | decussata var. brasiliensis, gardneriana, hatschbachii, leprieurii |
| Stelis | aprica, aquinoana, catharinensis, deregularis, fraterna, intermedia, leinigii, megantha, papaquerensis, parvifolia, pauciflora, pauloensis, pumila, reitzii, ruprechtiana |
| Stellaria | alsine, aphanantha, arvalis, chilensis, cryptopetala, cuspidata, debilis, media var. media, pallida, parviflora ssp. ignis, patagonica, pedersenii, villasenorii, weddellii |
| Stemodia | diplohyptoides, durantifolia var. chilensis, ericifolia, hassleriana, hyptoides, lanceolata, lobelioides, palustris, scoparioides, stricta, trifoliata, vandellioides, verticillata |
| Stenachaenium | adenanthum, campestre, macrocephalum, megapotamicum var. megapotamicum, megapotamicum f. minor, megapotamicum var. pedunculata, riedelii |
| Stenandrium | affine, diphyllum, dulce, mandioccanum, pohlii var. pusillum, pohlii var. breviscapum, tenellum |
| Stenocephalum | apiculatum, hexanthum, hystrix, megapotamicum, niveum |
| Stenodraba | chillanensis, colchaguensis, imbricatifolia, lagunae, lechleri, parvifolia, stenophylla, suffruticosa |
| Stenodrepanum | bergii |
| Stenogrammitis | wittigiana |
| Stenotaphrum | secundatum |
| Stephostachys | mertensii |
| Sterculia | striata |
| Stetsonia | coryne |
| Stevia | achalensis, alpina var. alpina, alpina var. glutinosa, alternifolia, amambayensis, ammotropha, amplexicaulis, apensis, aristata, balansae, breviaristata, burkartii, camachensis, carapariensis, catharinensis, centinelae, chamaedrys var. glandulifera, chamaedrys var. chamaedrys, cinerascens, clausseni, collina, congesta, crassicephala, crenulata, cruziana, cuneata, entreriensis, estrellensis, fiebrigii var. jujuiensis, fiebrigii var. vattuonei, fiebrigii var. fiebrigii, gardneriana, gilliesii var. glandulosa, gilliesii var. gilliesii, gratioloides, heptachaeta, involucrata, jujuyensis, leptophylla, lilloi, lundiana, maimarensis, mandonii, menthaefolia, mercedensis var. glanditecta, mercedensis var. pereyrae, mercedensis var. mercedensis, minor, multiaristata, myriadenia, okadae, ophryodonta, ophryophylla, parvifolia, philippiana, pohliana, potrerensis, procumbens, rebaudiana, regnellii, rojasii, sabulonis, sanguinea, satureiifolia var. satureiifolia, satureiifolia var. ventanensis, satureiifolia var. patagonica, schreiteri, selloi, spathulata, tarijensis, tenuis, vaga var. effusa, vaga var. vaga, vaga var. saltensis, veronicae, villaricensis, yaconensis var. subeglandulosa, yaconensis var. yaconensis, yaconensis var. aristifera, yaconensis var. saltensis, yalae |
| Steyermarkina | dispalata, dusenii, pyrifolia |
| Sticherus | bifidus, cryptocarpus, decurrens, ferrugineus, gracilis, lanuginosus, lepidotus, litoralis, nigropaleaceus, paulistanus, pruinosus, quadripartitus, squamulosus var. squamulosus, squamulosus var. gunckelianus |
| Stifftia | chrysantha |
| Stigmaphyllon | arenicola, bonariense, calcaratum, ciliatum, jatrophifolium, tomentosum |
| Stigmatopteris | bradei, brevinervis, caudata, heterocarpa, ulei |
| Stigmatosema | garayana, hatschbachii, odileana |
| Stillingia | bodenbenderi, oppositifolia, salpingadenia, tenella |
| Stizophyllum | perforatum |
| Stomatanthes | oblongifolius, subcapitatus |
| Streptochaeta | spicata |
| Strigosella | africana |
| Stromanthe | boliviana, glabra, papillosa , thalia, tonckat |
| Strombocarpa | abbreviata, burkartii, ferox, reptans, strombulifera var. ruiziana, strombulifera, tamarugo, torquata |
| Strophopappus | regnellii |
| Struchium | sparganophorum |
| Struthanthus | acuminatus, martianus, polyrrhizus, sessiliflorus, uraguensis |
| Strychnos | brasiliensis, fulvotomentosa, nigricans, parvifolia, pseudoquina, rubiginosa, trinervis |
| Stryphnodendron | adstringens, rotundifolium |
| Stuckenia | filiformis ssp. alpina, pectinata, striata |
| Stylogyne | pauciflora |
| Stylosanthes | bracteata, campestris, capitata, guianensis var. gracilis, guianensis var. guianensis, hippocampoides, leiocarpa, linearifolia, longiseta, macrosoma, montevidensis, nervosa, recta, rostrata, scabra, vallsii, viscosa |
| Styrax | acuminatus, camporum, ferrugineus, glabratus, latifolius, leprosus, martii, pohlii, subargenteus |
| Suaeda | altissima, argentinensis, densiflora, divaricata, foliosa, multiflora, nesophila, neuquenensis, paradoxa, patagonica |
| Swartzia | multijuga, oblata, submarginata |
| Sweetia | atrata, fruticosa |
| Syagrus | campylospatha, cerqueirana, flexuosa, hoehnei, lilliputiana, loefgrenii, oleracea, romanzoffiana |
| Symphoricarpos | albus |
| Symphyopappus | casarettoi, compressus, cuneatus, itatiayensis, lymansmithii, reitzii |
| Symphyotrichum | glabrifolium, graminifolium, laeve, patagonicum, peteroanum, regnellii, squamatum, vahlii |
| Symphytum | officinale |
| Symplocos | bidana, celastrinea, corymboclados, estrellensis, glandulosomarginata, incrassata, kleinii, lanceolata, laxiflora, nitens, nitidiflora, oblongifolia, pentandra, pubescens, pustulosa, revoluta, tenuifolia, tetrandra, trachycarpos, uniflora, variabilis |
| Synammia | espinosae, feuillei, intermedia ssp. intermedia, intermedia ssp. masafuerana |
| Synandrospadix | vermitoxicus |
| Synedrella | nodiflora |
| Synedrellopsis | grisebachii |
| Syngonanthus | anthemidiflorus, caulescens, chrysanthus, fischerianus, gracilis, helminthorrhizus, nitens |
| Syngonium | angustatum, podophyllum |
| Syringa | vulgaris |
| Syzygium | cumini, jambos |
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