| Caesalpinia |
exilifolia, mimosifolia, pumilio |
| Caiophora |
aconquijae, cernua, mollis, nivalis, pulchella |
| Calandrinia |
graminifolia |
| Calceolaria |
borsinii, brunellifolia, fothergillii, germainii, lagunaeblancae, lepidota, lilloi, mollisima, parviflora, pennellii, poikilanthes, racemosa, ruizlealii |
| Calibrachoa |
linearis, longistyla |
| Callianthemoides |
semiverticillata |
| Calycera |
calcitrapa, crassifolia, eryngioides, horrida, intermedia |
| Calydorea |
azurea, pallens, undulata |
| Campyloneurum |
tucumanense |
| Canna |
ascendens |
| Capanemia |
brachycion |
| Cardamine |
hispidula |
| Cardenanthus |
venturii |
| Cardionema |
kurtzii |
| Carex |
acaulis, argentina, austroamericana, boelckeiana, dusenii, humahuacaensis, macrosolen, minutissima, monodynama, moorei, nelmesiana, niederleiniana, patagonica, pseudomacloviana, rupicola, saltaensis, sorianoi, subantarctica, subfuegiana, tucumanensis |
| Cedrela |
saltensis |
| Centaurium |
ameghinoi |
| Centrosema |
kermesi, variifolium |
| Cerastium |
argentinum, hieronymi, kunthii, tucumanense |
| Cereus |
argentinensis |
| Cestrum |
kunthii |
| Chaetanthera |
acheno-hirsuta, apiculata, australis, gnaphalioides, pentacaenoides, pulsilla |
| Chaetotropis |
parvula |
| Chamelum |
bodenbenderi |
| Chaptalia |
ignota |
| Cheilanthes |
sarmientoi |
| Chenopodium |
cordobense, oblanceolatum, obscurum, parodii, ruizlealii, scabricaule, venturii |
| Chersodoma |
argentina, glabriuscula |
| Chiliophyllum |
andinum, densifolium, fueguianum |
| Chiliotrichiopsis |
ledifolia, mendocina |
| Chilocardamum |
castellanosii , longistylum, onuridifolium , patagonicum |
| Chiropetalum |
argentinense , patagonicum |
| Chlidanthus |
marginatus, yaviensis |
| Chloraea |
bella, castillonii, cogniauxii, elegans, phoenicea, praecincta , riojana, subpandurata, viridiflora, wittei |
| Chloris |
affinis, berroi |
| Chrysolaena |
cordifolia |
| Chrysosplenium |
macranthum |
| Chuquiraga |
aurea, avellanedae, calchaquina, echegarayi, erinacea, morenonis, rosulata, ruscifolia, straminea |
| Chusquea |
deficiens, egluma, floribunda |
| Cienfuegosia |
hispida, saraviae, schulzii |
| Cistanthe |
humilis, minuscula, stricta |
| Clinopodium |
darwinii |
| Clitoria |
cordobensis |
| Cnidosculus |
loasoides |
| Colobanthus |
lycopodiodes |
| Condalia |
megacarpa, microphylla, montana |
| Convolvulus |
lilloi, schulzei |
| Conyza |
altoandina , boelckei, burkartii, cordata, lorentzii, magnimontana, oligantha, pampeana, saltensis, spiciformis |
| Coronopus |
rhytidocarpus, serratus |
| Corynabutilon |
bicolor |
| Craniolaria |
argentina |
| Crassula |
minutissima, phascoides |
| Cressa |
nudicaulis |
| Croton |
catamarcensis, cordobensis, landoltii, laureltyanus, santolinus |
| Cryptantha |
cynoglossoides, diplotricha, latefissa, mendocina, papillosa, patagonica |
| Cuphea |
laeviuscula |
| Cuscuta |
alataloba, andina, argentinana, cristata, flossdorfii, friesii, membranacea, parodiana, rotundiflora, yunckeriana |
| Cynanchum |
descolei, diemii, samuelssonii, sarcostemma, trilobatum |
| Cynodon |
hirsutissimus, laeviglumis |
| Cypella |
elegans, lapidosa, osteniana, suffusa, trimontina, yatayphila |
| Cyperus |
berroi, felipponei, hieronymi, tweediei |
