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| Fabiana | australis, bryoides, densa, denudata, foliosa, friesii, imbricata, nana, patagonica, peckii, punensis, ramulosa, squamata, stephanii, viscosa |
| Facelis | lasiocarpa, plumosa, retusa |
| Fagonia | chilensis |
| Fallopia | japonica, sachalinensis |
| Famatinanthus | decussatus |
| Faramea | calyciflora, hassleriana, hyacinthina, martiana, montevidensis, multiflora, oligantha, porophylla, stenantha, stipulacea |
| Fascicularia | bicolor ssp. bicolor, bicolor ssp. canaliculata |
| Festuca | acanthophylla var. acanthophylla, acanthophylla var. scabriuscula, antucensis, argentina, argentinensis, arundinacea, australis, bromoides, buchtienii, chrysophylla, cirrosa, contracta, dissitiflora, distichovaginata, dolichathera, dolichophylla, fiebrigii, fimbriata, floribunda, giraldoi, gracillima var. glacialis, gracillima var. gracillima, hieronymi, humilior, hypsophila, juncifolia, kurtziana, lilloi, linigluma, magellanica, magensiana, masafuerana, masatierrae, megalura, monticola, muralis, myuros, nardifolia, nemoralis, octoflora, orthophylla, ovina ssp. tenuifolia, pallescens, pampeana, panda, parodiana, parodii, purpurascens, pyrogea, rigescens, robinsoniana, roigii, rubra, simpliciuscula, subantarctica, superba, tectoria, ulochaeta, uninodis, ventanicola, weberbaueri, werdermannii, yalaensis |
| Fevillea | passiflora, trilobata |
| Ficinia | nodosa |
| Ficus | adhatodifolia, arpazusa, calyptroceras, carica, castellviana, cestrifolia, citrifolia, clusiifolia, crocata, enormis, ernanii, eximia, gomelleria, guaranitica, lagoensis, luschnathiana, obtusifolia, obtusiuscula, organensis, pertusa, pulchella, rojasii, tomentella, trigona |
| Fimbristylis | aspera, autumnalis, boldriniana, campestris, castanea, complanata, cymosa, dichotoma var. dichotoma, dichotoma var. floribunda, littoralis, spadicea, squarrosa, stipitata, vahlii |
| Fischeria | stellata |
| Fitzroya | cupressoides |
| Flaveria | bidentis, haumanii |
| Fleischmannia | dissolvens, hassleri, laxicephala, microstemon, prasiifolia, remotifolia, schickendantzii |
| Floralia | flaccida |
| Floscopa | glabrata |
| Foeniculum | vulgare |
| Fonkia | uliginosa |
| Forsteronia | australis, correntina, glabrescens, leptocarpa, pubescens, refracta, rufa, thyrsoidea var. thyrsoidea, thyrsoidea var. glabriuscula, velloziana |
| Fosterella | albicans, penduliflora, rojasii |
| Fragaria | chiloensis, vesca |
| Frailea | buenekeri, castanea, cataphracta, curvispina, erythracantha, gracillima ssp. gracillima, gracillima ssp. horstii, mammifera ssp. angelesiae, mammifera ssp. mammifera, perumbilicata, phaeodisca, pumila, pygmaea ssp. pygmaea, pygmaea ssp. albicolumnaris, pygmaea ssp. fulviseta, pygmaea ssp. tuyensis, schilinzkyana |
| Francoa | appendiculata var. appendiculata, appendiculata var. ramosa, appendiculata var. sonchifolia |
| Frankenia | chilensis, chubutensis, fischeri, juniperoides, microphylla, patagonica, pulverulenta, salina, triandra, vidalii |
| Fraxinus | excelsior, ornus, pennsylvanica, velutina |
| Freesia | alba, laxa |
| Fridericia | candicans, caudigera, chica, conjugata, craterophora, fagoides, florida, leucopogon, mutabilis, platyphylla, pubescens, samydoides, speciosa, triplinervia, truncata, whitei |
| Froelichia | chacoensis, paraguayensis, procera, tomentosa |
| Fuchsia | boliviana, brevilobis, hatschbachii, lycioides, magellanica, regia ssp. serrae, regia ssp. reitzii |
| Fuirena | incompleta f. incompleta, incompleta f. glabra, robusta, umbellata |
| Fumaria | agraria, bastardii, capreolata, densiflora, muralis, officinalis, parviflora, rostellata |
| Funastrum | clausum, flavum, gracile |
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