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| Najas | affinis, conferta, guadalupensis, marina |
| Nama | dichotoma, jamaicensis, undulata var. undulata, undulata var. australis |
| Nanodea | muscosa |
| Nanogalactia | heterophylla, pretiosa, pretiosa var. trifoliolata |
| Napeanthus | primulifolius, reitzii |
| Nardophyllum | bryoides, chiliotrichoides, genistoides, lanatum, patagonicum |
| Nasa | urens |
| Nassauvia | aculeata var. aculeata, aculeata var. azorelloides, aculeata var. robusta, ameghinoi, argentea, argyrophylla, axillaris, chubutensis, coronipappa, cumingii, darwinii, dentata, digitata, dusenii, falklandica, fuegiana, gaudichaudii, glomerata, glomerulosa, hillii, juniperina, lagascae var. globosa, lagascae var. lagascae, lagascae var. lanata, lagascae f. solitaria, latissima, looseri, maeviae, magellanica, pentacaenoides, pinnigera, planifolia, pulcherrima, pygmaea var. intermedia, pygmaea var. pygmaea, pyramidalis, ramosissima, revoluta, ruizii, sceptrum, serpens, sprengelioides, sublobata, ulicina, uniflora |
| Nassella | airoides, arcaënsis, arcuata, arechavaletae, argentinensis, asplundii, barbinodis, brachychaetoides, brachyglumis, brachyphylla, brasiliensis, burkartii, cabrerae, caespitosa, carettei, catamarcensis, charruana, chilensis, coquimbensis, cordobensis, crassiflora, curamalalensis, depauperata, duriuscula, elata, entrerriensis, fabrisii, famatinensis, filiculmis, formicarum, gibba, gigantea, glabripoda var. glabripoda, glabripoda var. planifolia, hirtifolia, holwayi, hunzikeri, hyalina, inconspicua, juergensii, juncea, lachnophylla, laevissima, leptocoronata, leptothera, longicoronata, longiglumis, macrathera, macrotricha, manicata, megapotamia, melanosperma, mexicana, meyeniana, meyeri, mucronata, nardoides, neesiana, nidulans, niduloides, novari, nubicola, nutans, pampagrandensis, pampeana, paramilloensis, parodii, parva, pauciciliata, pfisteri, philippii, planaltina, poeppigiana, pseudopampagrandensis, psittacorum, pubiflora var. pubiflora, pubiflora var. humilior, pubiflora var. levipoda, punensis, pungens, quinqueciliata, ragonesei, rhizomata, rosengurttii, rupestris, sanluisensis, sellowiana, spegazzinii, stuckertii, subnitida, tenuiculmis, tenuis, tenuissima, torquata, trichotoma, tucumana, uspallatensis, vallsii, ventanicola, yaviensis |
| Nasturtium | microphyllum, officinale |
| Nautonia | nummularia |
| Navarretia | involucrata |
| Nectandra | angusta, angustifolia, briquetii, cissiflora, cuspidata, globosa, grandiflora, hihua, lanceolata, leucantha, membranacea, nitidula, oppositifolia, paranaensis, puberula, reticulata |
| Neea | hermaphrodita, pendulina |
| Neja | filiformis, pinifolia |
| Neltuma | × vinalillo, affinis, alba, alba var. atacamensis, alba var. panta, alpataco, alpataco var. lamaro, alpataco f. rubra, argentina, caldenia, calingastana, campestris, castellanosii, chilensis, chilensis var. catamarcana, chilensis var. riojana, chilensis var. berteroana, denudans, denudans var. patagonica, denudans var. stenocarpa, elata, fiebrigii, flexuosa, flexuosa var. depressa, flexuosa var. fruticosa, flexuosa f. subinermis, hassleri, hassleri var. nigroides, humilis, kuntzei, nigra, nigra var. longispina, nigra var. ragonesei, nuda, pugionata, rojasiana, rubriflora, ruizlealii, ruscifolia, sericantha |
| Nelumbo | nucifera |
| Nematanthus | australis, fissus, jolyanus, maculatus, tessmannii, wettsteinii |
| Neobaclea | crispifolia |
| Neobartsia | australis, chilensis, crenoloba, elongata, jujuyensis, peruviana, serrata |
| Neoblechnum | brasiliense |
| Neobouteloua | lophostachya, pauciracemosa |
| Neocabreria | catharinensis, concinna, malachophylla, pennivenia, serrulata |
| Neomarica | caerulea, candida, glauca, gracilis, imbricata, latifolia, northiana, speciosa |
| Neomitranthes | cordifolia, gemballae, glomerata, gracilis, obscura, warmingiana |
| Neonotonia | wightii |
| Neoporteria | castanea, clavata, nidus, sociabilis, subgibbosa, villosa |
| Neoregelia | chlorosticta, doeringiana, laevis, maculata |
| Neosparton | aphyllum, ephedroides, patagonicum |
| Neowerdermannia | chilensis, vorwerkii |
| Nepeta | cataria |
| Nephrolepis | biserrata, brownii, cordifolia, exaltata, pectinata, pendula, rivularis |
| Neptunia | plena, pubescens |
| Neslia | paniculata |
| Nesocaryum | stylosum |
| Neuontobotrys | berningeri, choiquensis, elloanensis, frutescens, grayanus, intricatissimus, lanatus, linearifolius, mendocina, polyphyllus, robustus, tarapacanus |
| Nicandra | physalodes |
| Nicoraepoa | andina var. andina, andina ssp. chonotica, erinacea, pugionifolia, robusta, stepparia, subenervis ssp. subenervis var. -, subenervis ssp. spegazziniana var. - |
| Nicotiana | acaulis, acuminata var. acuminata, acuminata var. compacta, acuminata var. multiflora, alata, ameghinoi, azambujae, bonariensis, cordifolia ssp. cordifolia, cordifolia ssp. sanctaclarae, corymbosa var. corymbosa, corymbosa var. australis, forgetiana, glauca, knightiana, langsdorfii, linearis, longibracteata, longiflora, miersii var. lychnoides, miersii var. miersii, mutabilis, noctiflora, otophora, paa, pauciflora, petunioides, plumbaginifolia, rupicola, solanifolia, spegazzini, sylvestris, tabacum, undulata |
| Nidularium | albiflorum, amazonicum, angustibracteatum, angustifolium, campo-alegrense, campos-portoi, catarinense, innocentii var. innocentii, innocentii var. striatum, innocentii var. lineatum, jonesianum, longiflorum, procerum, purpureum, rosulatum, rutilans, scheremetiewii |
| Niedenzuella | acutifolia, lucida, multiglandulosa, sericea, stannea, suaveolens |
| Nierembergia | aristata, browallioides, calycina, ericoides, graveolens, hatschbachii, linariaefolia var. glabriuscula, linariaefolia var. pampeana, linariaefolia var. pinifolioides, linariifolia var. linariaefolia, micrantha, pinifolia, pulchella var. pulchella, pulchella var. longistyla, pulchella var. macrocalyx, repens, rigida, riograndensis, rivularis, scoparia, tandilensis, tucumanensis, veitchii |
| Niphidium | crassifolium, rufosquamatum |
| Nissolia | brasiliensis, chacoensis, fruticosa var. guatemalensis, longiflora, nigricans, vincentina |
| Nitrophila | atacamensis, australis var. australis, australis var. kunzei |
| Noccaea | magellanica |
| Noisettia | orchidiflora |
| Nolana | acuminata, adansonii, albescens, aplocaryoides, arenicola, baccata, balsamiflua, carnosa, clivicola, coelestis, crassulifolia, deflexa, dianae, diffusa, divaricata, elegans, filifolia, foliosa, glauca, gracillima, incana, inconspicua, intonsa, jaffuelii, lachimbensis, leptophylla, linearifolia, lycioides, mollis, onoana, paradoxa, parviflora, patachensis, patula, peruviana, philippiana, pterocarpa, ramosissima, reichei, rhombifolia, rostrata, rupicola, salsoloides, sedifolia, sessiliflora, sphaerophylla, stenophylla, tarapacana, tocopillensis, villosa, werdermannii |
| Nopalea | cochenillifera |
| Norantea | goyasensis, guianensis ssp. guianensis, guianensis ssp. japurensis |
| Nordenstamia | fabrisii |
| Notanthera | heterophylla |
| Nothofagus | alessandri, alpina, antarctica, betuloides, dombeyi, glauca, macrocarpa, nitida, obliqua, pumilio |
| Notholaena | sulphurea |
| Nothoschkuhria | degenerica |
| Nothoscordum | achalense, albitractum, altillanense, andicola, aparadense, arenarium, auratum, balaenense, basalticum, bivalve var. bivalve, bivalve var. nanum, boliviense, bonariense, capivarinum, carambolense, catharinense, clevelandicum, conostylum, correntinum, cuyanum, dynamiandrum, elongatum, exile, gaudichaudianum, gibbatum, gracile var. gracile, gracilipes, gramineum var. gramineum, gramineum var. philippianum, inundatum, ipacarainum, itatiense, izaguirreae, luteomajus, macrantherum, macrostemon, mahui, marchesii, moconense, modestum, montevidense ssp. latitepalum, montevidense ssp. minarum, montevidense ssp. montevidense, muscorum, nublense, nudicaule, nudum, ostenii, pachyrhizum, paradoxum, parvum, patricium, pedersenii, portoalegrense, punillense, saltense, scabridulum, sengesianum, stenandrum, tenuifolium, tibaginum, uruguaianum, urutaense, velazcoënse, yatainum |
| Noticastrum | acuminatum, adscendens, antucense, argenteum, argentinense, calvatum, chebataroffii, decumbens, diffusum, erectum, eriophorum, gnaphalioides, hatschbachii, jujuyense, macrocephalum, malmei, marginatum, psammophilum, sericeum |
| Notiosciadium | pampicola |
| Notogrammitis | angustifolia, crassior, patagonica |
| Nototriche | alternata, anthemidifolia, argentea, auricoma, borussica, cabrerae, caesia, cajonensis, calchaquensis, castillonii, chaniensis, chuculaensis, clandestina, compacta, copon, diminutiva, estipulata, famatinensis, friesii, glabra, glauca, hieronymi, hillii, hunzikeri, kurtzii, leucosphaera, lorentzii, macrotuba, meyenii, nana, niederleinii, obcuneata var. cinerea, obcuneata var. obcuneata, orbignyana, ovata, parviflora, pedicularifolia, philippii, pulverulenta, pulvilla, pulvinata, pusilla, pygmaea, rohmederi, rugosa, sleumeri, stipularis, tucumana, turritella, viridula |
| Notylia | hemitricha, lyrata, pubescens |
| Novenia | acaulis |
| Nuttallanthus | canadensis |
| Nymphaea | alba, amazonum, caerulea, gardneriana, jamesoniana, lotus, odorata, oxypetala, pedersenii, prolifera, pulchella, rudgeana |
| Nymphoides | indica, verrucosa |
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