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| Najas | conferta, guadalupensis, marina, microcarpa |
| Nama | dichotoma, jamaicensis, undulata var. undulata, undulata var. australe |
| Nanodea | muscosa |
| Nanogalactia | heterophylla, pretiosa, pretiosa var. trifoliolata |
| Napeanthus | primulifolius, reitzii |
| Nardophyllum | bryoides, chiliotrichioides, 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, megaphylla, membranacea, nitidula, oppositifolia, paranaensis, puberula, reticulata |
| Neea | hermaphrodita, pendulina |
| Neja | filiformis, pinifolia |
| Nelumbo | nucifera |
| Nemaconia | striata |
| Nematanthus | australis, fissus, jolyanus, maculatus, tessmanii, wettsteinii |
| Neobaclea | crispifolia |
| Neobartsia | australis, chilensis, crenoloba, elongata, jujuyensis, peruviana, serrata |
| Neoblechnum | brasiliense |
| Neobouteloua | lophostachya, paucirracemosa |
| Neocabreria | catharinensis, concinna, malacophylla, pennivenia, serrulata |
| Neomarica | caerulea, candida, glauca, gracilis, imbricata, latifolia, northiana, rotundata, speciosa |
| Neomitranthes | cordifolia, gemballae, glomerata, gracilis, obscura, warmingiana |
| Neonotonia | wightii |
| Neoporteria | castanea, clavata, nidus, sociabilis, subgibbosa, villosa |
| Neoregelia | chlorosticta, doeringiana, laevis |
| Neosparton | aphyllum, ephedroides, patagonicum |
| Neowerdermannia | chilensis, vorwerkii |
| Nepeta | cataria |
| Nephrolepis | biserrata, brownii, cordifolia, exaltata, pectinata, pendula, rivularis |
| Neptunia | plena, pubescens |
| Nertera | granadensis |
| Neslia | paniculata |
| Nesocaryum | stylosum |
| Neuontobotrys | berningeri, choiquense, elloanensis, frutescens, grayana, intricatissima, lanata, linearifolia, mendocina, polyphylla, robusta, tarapacana |
| 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, billbergioides, campo-alegrense, campos-portoi, catarinense, innocentii var. innocentii, innocentii var. striatum, innocentii var. lineatum, jonesianum, longiflorum, microps, procerum, purpureum, rosulatum, rutilans, scheremetiewii |
| Niedenzuella | acutifolia, lucida, multiglandulosa, sericea, stannea, suaveolens |
| Nierembergia | aristata, browallioides, calycina, ericoides, graveolens, hatschbachii, linariaefolia var. linariaefolia, linariaefolia var. glabriuscula, linariaefolia var. pampeana, linariaefolia var. pinifolioides, 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. kuntzei |
| 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 | goyazensis, 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, calderense, cambarense, capivarinum, castilloi, catharinense, clevelandicum, collinum, conostylum, correntinum, curvipes, dynamiandrum, entrerianum, exile, famatinense, flavescens, gaudichaudianum, gibbatum, glareosum, gracile var. gracile, gracile var. macrostemon, gracilipes, gramineum var. gramineum, gramineum var. philippianum, ibiramense, inundatum, ipacarainum, itatiense, izaguirreae, leptogynum, luteomajus, macrantherum, mahui, marchesii, moconense, modestum, montevidense ssp. latitepalum, montevidense ssp. minarum, montevidense ssp. montevidense, muscorum, nidulans, nublense, nudicaule, nudum, nutans, ostenii, pachyrhizum, paradoxum, patricium, pedersenii, planifolium, portoalegrense, punillense, rigidiscapum, saltense, scabridulum, sengesianum, stenandrum, subtile, tafiense, tarijanum, tenuifolium, tibaginum, tricostatum, uruguaianum, velazcoënse, yalaënse, yatainum |
| Noticastrum | acuminatum, adscendens, antucense, argenteum, argentinense, calvatum, chebataroffii, decumbens, diffusum, erectum, eriophorum, gnaphalioides, hatschbachii, jujuyense, macrocephalum, malmei, marginatum, psammophilum, sericeum |
| Notiosciadium | pampicola |
| Notocactus | horstii f. muglianus |
| 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, pediculariifolia, philippii, pulverulenta, pulvilla, pulvinata, pusilla, pygmaea, rohmederi, rugosa, sleumeri, stipularis, tucumana, turritella, viridula |
| Notylia | hemitricha, lyrata, pubescens |
| Novenia | acaulis |
| Nuttallanthus | canadensis |
| Nymphaea | alba, amazonum ssp. amazonum, caerulea, gardneriana, jamesoniana, oxypetala, pedersenii, prolifera, pulchella, rudgeana |
| Nymphoides | indica, verrucosa |
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