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| Jaborosa | ameghinoi, bergii, cabrerae, caulescens var. caulescens, caulescens var. bipinnatifida, chubutensis, integrifolia, kurtzii, laciniata, lanigera, leucotricha, magellanica, odonelliana, oxipetala, parviflora, pinnata, reflexa, riojana, rotacea, runcinata, sativa, squarrosa, volkmannii |
| Jacaranda | brasiliana, caroba, cuspidifolia, decurrens, micrantha, mimosifolia, mutabilis, puberula |
| Jacaratia | corumbensis, spinosa |
| Jacquemontia | anomala, blanchetii, cataractae, confusa, densiflora, estrellensis, evolvuloides, ferruginea, frankeana, fruticulosa, glabrescens, guaranitica, heterotricha, holosericea, linoides, lorentzii, martii, mucronifer, paraguayensis, pentanthos, rojasiana, selloi, sphaerostigma, tamnifolia, turneroides |
| Jacquiniella | globosa |
| Jaegeria | hirta |
| Jamesonia | osteniana |
| Janochloa | antidotale |
| Janusia | guaranitica, linearifolia, mediterranea, occhionii |
| Jarava | academica, annua, breviseta, castellanosii, durifolia, filifolia, hypsophila, hystricina, ichu var. ichu, ichu var. pungens, illimanica, juncoides, leptostachya, media, neaei, plumosa, plumosula, pogonathera, polyclada, pseudoichu, psylantha, pungionata, scabrifolia, scirpea, subaristata, subplumosa, tortuosa |
| Jasminum | mesnyi |
| Jatropha | bornmuelleri, breviloba, curcas, dissecta, elliptica, excisa var. excisa, excisa var. pubescens, excisa var. viridiflora, flavovirens, gossypiifolia var. gossypiifolia, gossypiifolia var. elegans, grossidentata, guaranitica, hieronymi, hippocastanifolia, intermedia, isabellei var. antisyphilitica, isabellei var. isabellei, macrocarpa, multifida, pedersenii, peiranoi, weddelliana |
| Jaumea | linearifolia |
| Jobinia | connivens, fontellana, glossostemma, hatschbachii, latipes, lindbergii, paranaensis, samuelssonii, trifurcata |
| Jodina | rhombifolia ssp. rhombifolia, rhombifolia ssp. delasotae |
| Johnstonella | albida, diplotricha, parviflora, punensis |
| Jovellana | guentheri, punctata, violacea |
| Juania | australis |
| Jubaea | chilensis |
| Juglans | australis |
| Juncus | acuminatus, acutus ssp. leopoldii, acutus var. decompositus, andersonii, articulatus, austrobrasiliensis, balticus ssp. mexicanus, balticus ssp. andicola, brasiliensis, bufonius var. bufonius, bufonius var. condensatus, bulbosus, burkartii, capillaceus, capitatus, conglomeratus, cordobensis, cyperoides, debilis, densiflorus, dichotomus, diemii, effusus var. effusus, effusus var. subglomeratus, ernesti-barrosii, filiformis, homalocaulis, imbricatus, involucratus, kleinii, kraussii, llanquihuensis, marginatus, micranthus, microcephalus, pallescens var. achalensis, pallescens var. pallescens, planifolius, procerus, ramboi, scheuchzerioides, stipulatus, tenuis var. congestus, tenuis var. tenuis, uruguensis, venturianus |
| Junellia | aretioides, azorelloides, ballsii, bisulcata var. bisulcata, bisulcata var. campestris, bryoides, caespitosa, congesta, connatibracteata, crithmifolia, digitata var. integerrima, digitata var. digitata, erinacea, hookeriana var. hookeriana, hookeriana var. catamarcensis, juniperina, lavandulaefolia, micrantha, minima, odonellii, origenes, pappigera, patagonica, pseudojuncea, selaginoides var. selaginoides, selaginoides var. illapelina, seriphioides, silvestrii, spathulata var. glauca, spathulata var. spathulata, spissa, succulentifolia, thymifolia, toninii var. toninii, toninii var. mulinoides, tridactylites, trifurcata, ulicina, uniflora |
| Jungia | floribunda, pauciflora, polita, sellowii, sordida |
| Juniperus | communis |
| Jupunba | brachystachya, langsdorffii |
| Justicia | aequilabris, axillaris, baenitzii, bradegeeana, brasiliana, carnea, catharinensis, chacoënsis, comata, cordifolia, corumbensis, cuspidulata, dumetorum, dusenii, floribunda, gilliesii, glaziovii, glutinosa, goudotii, hassleri, hatschbachii var. hatschbachii, hatschbachii var. catharinensis, hunzikeri, jujuyensis, kleinii, kuntzei, laevilinguis, lilloana, lilloi, lythroides, mandonii, oblonga, oranensis, parabolica, pectoralis, phyllocalyx, polygaloides, ramulosa, riojana, rusby, saltensis, schenckiana, squarrosa, tocantina, tweediana, xylosteoides, yhuensis |
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