| Sabulina |
altoandina |
| Sacoila |
secundiflora |
| Samolus |
spathulatus |
| Sarcodraba |
andina, dusenii , karraikensis, subterranea |
| Satureja |
darwinii |
| Saxifragella |
bicuspidata |
| Schinus |
bumelioides, gracilipes, johnstonii, marchandii, odonellii, praecox, roigii, sinuatus |
| Schistogyne |
longipedunculata, pubescens, tucumanensis |
| Schreiteria |
macrocarpa |
| Scirpus |
chubutensis, spegazzinianus |
| Scleria |
schulzii |
| Sclerophylax |
adnatifolia, arnottii, caducifructus, cocuccii, cuyanus, cynocrambe, difulvioi, hunzikeri, kurtzii, lorentzianus, ruizlealii, tenuicaulis, trispermus |
| Sedum |
jujuyense |
| Senecio |
achalensis, adrianicus, alloeophyllus, altoandinus, ambatensis, ameghinoi, anconquijae, arechavaletae, argophylloides, asplenifolius, australandinus, barbarae, beaufilsii, belenensis, bergii , boelckei, bravensis, cajonensis, calchaquinus, calingastensis, canchahuinganquensis, carbonensis, catamarcensis, chipauquilensis , chrysanthemum, chrysocomoides, coluhuapiensis, comberi, corcovadensis, covuncensis, cremeiflorus, cremnicola, cremnophilus, cryptocephalus, culcitenellus, cylindrocephalus, delicatulus, desideratus, diaguita, diemii, divaricoides, eightsii, fabrisii, famatinensis, ferruglii, flagellifolius, fragrantissimus, friesii, ganganensis, glandulifer, glandulosus, goldsackii, grandjotii, grindeliaefolius, gymnocaulos, hatcherianus, helgae, hjertingii, hualtaranensis, huitrinicus, humifusus, infimus, jaffuelii, jobii, jujuyensis, julianus, keshua, kingii, krapovickasii, kunturinus, laetevirens, lanosissimus, laseguei, leucomallus, leucopeplus, leucophyton, leucostachys, lilloi, lithostaurus, littoralis, lorentzii, maculatus, maeviae, magellanicus, manguensis, megaoreinus, melanopotamicus, miser, mustersii, nemiae, niederleinii, obesus, obtectus, octolepis, odonellii, ostenii, otopterus, pelquensis, perezii, pinachensis, pissisii, pogonias, pseudaspericaulis, pseudodepressus, pseudotites, pumilus, punae, quequensis, ragonesei, reedi, renjifoanus, repollensis, retanensis, riojanus, roripifolius, ruizlealii, saltensis, sanagastae, sandwithii, saucensis, schreiteri, sectilis, socompae, sorianoi, steparius, subpanduratus, tandilensis, tehuelches, tilcarensis, tocomarensis, toroanus, trafulensis, tricephalus, trifidus, tucumanensis , uspallatensis, vaginatus, varvarcensis, ventanensis, vervoorstii, viravira , websteri, werdermannii, yalae, zapalae |
| Senna |
acanthoclada, kurtzii, nudicaulis, pachyrrhiza, rigidicaulis, subulata |
| Setaria |
alonsoi, cordobensis, mendocina, pampeana |
| Setiechinopsis |
mirabilis |
| Sicyos |
ignarus |
| Sida |
calchaquiensis, pindapoyensis, rhizomatosa, tressensiae |
| Silene |
antarctica, argentina, argentinensis, bersieri, chubutensis, cuspidata, echegarayi, filifolia, haumanii, magellanica, margaritae, melanopotamica, patagonica |
| Siphocampylus |
hypopogon, yerbalensis |
| Sisymbrium |
ameghinoi, arnottianum, carolinense, castellanosii, gilliesii, longistylum, magellanicum, mendocium, onuridifolium, patagonicum, polyphyllum, robustum, stenophyllum, subscandens, tomentosum, tucumanense, ventanense |
| Sisyrinchium |
acaule, andinopatagonicum, biflorum, ciliolatum, deseadense, exifolium, humile, latiusculum, macrocarpum, papillosum, paucispathum, rigidifolium, scalarium, somuncurense, tafiense, tucumanum, unguiculatum |
| Skeptrostachys |
correana |
| Skottsbergianthus |
colobanthoides, sorianoi |
| Solanum |
aemulans, annuum , bonariense, caesium, calileguae, concarense, delitescens, echegarayi, euacanthum, fabrisii, glaberrimum, glandulosipilosum, hastatilobum, homalospermum, incisum, juncalense, kurtzianum, micrantherum, montigenum, mortonii, neorossii, pedersenii, profusum, puberulofructum, reductum, riojense, ruizlealii, salamancae, tredecimgranum, venturii, vernei, x brucheri, x rechei, zuloagae |
| Solidago |
patagonica, vigaurea |
| Soliva |
triniifolia |
| Sophora |
linearifolia, rhynchocarpa |
| Spergula |
calva |
| Spermolepis |
castellanosi |
| Sphaeralcea |
australis, brevipes, chenopodifolia, cordobensis, crispa, laciniata, mendocina, miniata, philippiana, tehuelches |
| Sporobolus |
maximus, mendocinus, phleoides |
| Staelia |
juarezii |
| Stangea |
calchaquina |
| Stellaria |
aphanantha, cryptopetala |
| Stemodia |
diplohyptoides, tetragona |
| Stenodrepanum |
bergii |
| Stevia |
achalensis, alpina, burkartii, carapariensis, centinelae, crassicephala, gilliesii, grisebachiana Hieron. , jujuyensis, lilloi, maimarensis, minor, okadae, procumbens, sanguinea, schreiteri, vaga, yalae |
| Stillingia |
patagonica |
| Stipa |
academica, ambigua, ameghinoi, arcaënsis, arenicola, argentinensis, barrancaensis, brachychaetoides, braun-blanqueti, breviseta, caespitosa, carettei, castellanosii, choconensis, chubutensis, colloncurensis, cordobensis, curamalalensis, durifolia, henrardiana, hieronymusii, hunzikeri, hypsophila, hystricina, ibarii, jucunda, kieslingii, leptothera, ligularis, macrotricha, maeviae, malalhuensis, mapuche, marqueziana, media, nana, nicorae, nidulans, niduloides, nubicola, pampeana, paramilloensis, parodiana, patagonica, plagiostephana, pseudopampagrandensis, psittacorum, psylantha, ruizlealii, sanluisensis, scabrifolia, scirpea, semperiana, sorianoi, stuckertii, subplumosa, tenuis, uspallatensis, vatroensis, ventanicola, zulmae |
| Stuckertiella |
peregrina |
| Suaeda |
argentinensis, densiflora, neuquenensis, patagonica |
| Symphyotrichum |
patagonicum |
