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| Labatia | gardneriana, salicifolia |
| Lablab | purpureus |
| Laburnum | anagyroides |
| Lachemilla | diplophylla, sandiensis |
| Lachesiodendron | viridiflorum |
| Lacistema | hasslerianum, lucidum |
| Lactoris | fernandeziana |
| Lactuca | canadensis, saligna, sativa, serriola, virosa |
| Laelia | gloriosa |
| Laennecia | altoandina, artemisioides, sophiifolia |
| Lafoensia | nummularifolia, pacari, vandelliana |
| Lagascea | mollis |
| Lagenaria | siceraria |
| Lagenocarpus | junciformis, polyphyllus, rigidus ssp. rigidus, rigidus ssp. tenuifolius, triqueter |
| Lagenophora | hariotii, hirsuta, nudicaulis |
| Laguncularia | racemosa |
| Lagurus | ovatus |
| Lamanonia | cuneata, ternata |
| Lamarckia | aurea |
| Lamium | amplexicaule, purpureum |
| Lampayo | castellanii, hieronymi, medicinalis |
| Landoltia | punctata |
| Langsdorffia | heterotepala, hypogaea |
| Lankesterella | caespitosa, ceracifolia |
| Lantana | achyranthifolia, balansae, camara, canescens, entrerriensis, fucata, grisebachii, hypoleuca, lundiana, magnibracteata, megapotamica, micrantha, montevidensis, ramboi, tilcarensis, trifolia f. trifolia, trifolia f. hirsuta, undulata, velutina, xenica |
| Lapageria | rosea |
| Laportea | aestuans |
| Lappula | redowskii |
| Lapsana | communis |
| Lardizabala | funaria |
| Larrea | ameghinoi, cuneifolia, divaricata, nitida |
| Lasiacis | divaricata var. austroamericana, ligulata, sorghoidea |
| Lastarriaea | chilensis |
| Lasthenia | kunthii |
| Lastreopsis | amplissima |
| Latace | andina f. andina, andina f. lutea, serenense |
| Lathyrus | cabrerianus, campestris, cicera, crassipes, elegans, hasslerianus, hirsutus var. ecirrhosus, hirsutus var. hirsutus, hookeri, ibicuiensis, japonicus var. japonicus, japonicus var. aleuticus, latifolius, linearifolius, lomanus, macropus, macrostachys, magellanicus var. magellanicus, magellanicus var. longipes, magellanicus var. gladiatus, magellanicus var. glaucescens, magellanicus var. tucumanensis, multiceps, nervosus, nigrivalvis, nitens, odoratus, paraguariensis, paranensis, parodii var. parodii, parodii var. brevipetiolata, pastorei, pubescens var. pubescens, pubescens var. monticola, pusillus, sativus, sericeus, subandinus, subulatus, tropicalandinus |
| Latua | pubiflora |
| Laurelia | sempervirens |
| Laureliopsis | philippiana |
| Laurembergia | tetrandra |
| Laurus | nobilis |
| Lavoisiera | imbricata, pulchella |
| Leandra | amplexicaulis, barbinervis, brackenridgei, calvescens, carassana, debilis, glazioviana, gracilis, hirtella, luctatoris, macropora, multiplinervis, neglecta, opaca, pallida, planifilamentosa, polystachya, purpurascens, purpureovillosa, refracta, reitzii, reversa, riograndensis, sericea, strigilliflora, sulfurea, tetraquetra, xanthocoma, xanthostachya |
| Lebetanthus | myrsinites |
| Lecanophora | ameghinoi, chubutensis, ecristata, heterophylla, jarae, ruiz-lealii, subacaulis |
| Lecointea | hatschbachii |
| Leersia | hexandra, ligularis var. grandiflora, virginica |
| Legenere | valdiviana |
| Legrandia | concinna |
| Leiothrix | arechavaletae, flavescens var. flavescens, flavescens var. polystemma |
| Lellingeria | apiculata, brevistipes, ciliolepis, depressa, itatimensis, tamandarei |
| Lemna | aequinoctialis, disperma, gibba, minuta, valdiviana |
| Lenzia | chamaepitys |
| Leonotis | nepetifolia |
| Leontodon | autumnalis, hirtus, saxatilis |
| Leonurus | cardiaca, japonicus |
| Lepanthopsis | floripecten |
| Lepechinia | chilensis, floribunda, meyenii, salviae, subhastata, vesiculosa |
| Lepidagathis | alopecuroidea, alvarezia, diffusa, meridionalis |
| Lepidaploa | amambaia, argyrotrichia, balansae, chamissonis, decumbens, eriolepis, novarae, pseudomuricata, psilostachya, remotiflora, salzmannii, setososquamosa, tarijensis |
| Lepidium | angustissimum, appelianum, argentinum, auriculatum, bipinnatifidum, boelckeanum, boelckei, bonariense, burkartii, campestre, chalepense, chichicara, coronopus, cumingianum, densiflorum, depressum, didymum, draba, filisegmentum, gracile, heterophyllum, hickenii, horstii, johnstonii, jujuyanum, latifolium, meyenii, myrianthum, nitidum, parodii, pedersenii, perfoliatum, philippianum, pinnatifidum, pseudodidymum, pubescens, rahmeri, reichei, rhytidocarpum, ruderale, santacruzensis, sativum, serratum, spathulatum, spicatum, strictum, stuckertianum, subulatum, tandilense, virginicum |
| Lepidoceras | chilense |
| Lepidophyllum | cupressiforme |
| Lepidothamnus | fonkii |
| Lepismium | lineare, warmingianum |
| Leptinella | scariosa |
| Leptocarpha | rivularis |
| Leptochloa | chloridiformis, crinita, pluriflora, virgata |
| Leptoglossis | linifolia |
| Leptolobium | elegans |
| Leptosiphon | pusillus |
| Leptospron | adenanthum |
| Leptostelma | catharinense, maxima, meyeri, tucumanense, tweediei |
| Leptotes | bicolor, paulensis, tenuis, unicolor |
| Lepturus | repens |
| Lepuropetalon | spathulatum |
| Lessingianthus | arachniolepis, argenteus, asteriflorus, bardanoides, bellulus, brevifolius, cataractarum, centauropsideus, concepcionis, constrictus, correntinus, durus, elegans, exiguus, glabratus var. glabratus, glabratus var. angustifolius, grandiflorus, hasslerianus, hypochaeris, lanatus, laniferus, lorentzii, macrocephalus, macrophyllus, magnificus, mollissimus var. mollisimus, mollissimus var. microcephalus, niederleinii, paraguariensis, parvifolius, plantaginodes, platyphyllus, polyphyllus, profusus, pseudoincanus, psilophyllus, pubescens, pumillus, pusillus, ramellae, reitzianus, rubricaulis, saltensis, sanctipauli, sellowii, spicatus, teyucuarensis, ulei, varroniifolius, westermanii |
| Leucaena | leucocephala ssp. leucocephala, leucocephala ssp. glabrata |
| Leucanthemum | vulgare |
| Leucas | martinicensis |
| Leucheria | achillaeifolia, amoena, apiifolia, bridgesii, candidissima, cantillanensis, coerulescens, diemii var. diemii, diemii var. purpurea, eriocephala, floribunda, fusca, gayana, gilliesii, glacialis, graui, hieracioides, lithospermifolia ssp. lithospermifolia, lithospermifolia ssp. integrifolia, meladensis, nutans, peteroana, polyclados, purpurea, rosea, runcinata, salina, scrobiculata, suaveolens, tomentosa, viscida |
| Leucheria | |
| Leucochloron | incuriale |
| Leucocoryne | alliacea, angosturae, appendiculata, arrayanensis, candida, codehuensis, conconensis, conferta, conostyla, coquimbensis, curacavina, dimorphopetala, editiana, fragrantissima, fuscostriata, gilliesioides, inclinata, incrassata, ixioides, leucogyna, lilacea, lituecensis, lurida, macropetala, maulensis, modesta, mollensis, montana, odorata, pachystyla, porphyrea, praealta, purpurea, quilimarina, roblesiana, rungensis, simulans, subulata, taguataguensis, talinensis, tricornis, ungulifera, valparadisea, violacescens, vittata |
| Leucojum | vernum |
| Leucostele | faundezii, litoralis, nigripilis, pectinifera, skottsbergii, undulosa |
| Leucotrichum | organense, schenckii |
| Leunisia | laeta |
| Levisticum | officinale |
| Leymus | arenarius, erianthus |
| Liabum | acuminatum |
| Libertia | chilensis, sessiliflora, tricocca |
| Libidibia | paraguariensis |
| Licaria | armeniaca |
| Ligaria | cuneifolia |
| Ligustrum | lucidum, ovalifolium, sinense, vulgare |
| Lilaeopsis | attenuata, brasiliensis, carolinensis, occidentalis, tenuis |
| Lilium | regale |
| Limnobium | laevigatum |
| Limnocharis | flava, laforestii |
| Limonium | brasiliense, guaicuru |
| Limosella | australis |
| Linaria | genistifolia ssp. dalmatica, purpurea, vulgaris |
| Lindernia | diffusa, dubia, rotundifolia |
| Lindsaea | arcuata, bifida, botrychioides, guianensis ssp. guianensis, guianensis ssp. lancecastrum, lancea, ovoidea, portoricensis, quadrangularis ssp. quadrangularis, quadrangularis ssp. terminalis, stricta, virescens var. virescens, virescens var. catharinae |
| Linum | bienne, brevifolium, burkartii, carneum, catharticum, chamissonis, cremnophilum, erigeroides, littorale var. littorale, littorale var. oblongifolium, macraei var. macraei, macraei var. marticorenae, prostratum, ramosissimum, scoparium, smithii, usitatissimum |
| Liparis | nervosa, vexillifera |
| Lippia | alba var. alba, angustifolia, arechavaletae, aristata var. aristata, asperrima, balansae, brachypoda, brasiliensis, campestris, coarctata, coriacea, crucifera, ekmanii, fragrans, grandiflora, grata, hassleriana, hieraciifolia, hirta, junelliana, lasiocalycina, lasiocalyx, lippioides, longipedunculata, lorentzii, lupulina, origanoides, paraguariensis, paranensis, procurrens, pumila, recolletae, renifolia, rodriguezii, salsa, sandwithiana, sclerophylla, suffruticosa, tegulifera, turbinata f. magnifolia, turbinata f. turbinata, turnerifolia var. polytricha, turnerifolia var. turnerifolia, villafloridana |
| Lithachne | pauciflora |
| Lithodraba | mendocinensis |
| Lithospermum | officinale |
| Lithraea | brasiliensis, caustica, molleoides |
| Littorella | australis |
| Llagunoa | glandulosa |
| Loasa | acanthifolia, acerifolia, arnottiana, caespitosa, chrysantha, elongata, floribunda, heterophylla, humilis, illapelina, insons, mendocina, mollensis, multifida, nitida, pallida, paradoxa, placei, prostrata, rotundifolia, sclareifolia, sigmoidea, tricolor, triloba |
| Lobelia | anceps, aquatica, bridgesii, camporum, exaltata, excelsa, fastigiata, fervens, hassleri, hederacea, langeana, nana, nummularioides, oligophylla, polyphylla, reniformis, tupa, xalapensis |
| Lobivia | bonnieae, bruchii, chrysantha var. chrysantha, chrysantha var. hypocyrta, chrysochete var. minutiflora, chrysochete var. chrysochete, crassicaulis, densispina, famatimensis var. sanjuanensis, famatimensis var. famatimensis, formosa var. formosa, formosa var. rosarioana, gonjianii, haematantha var. haematantha, haematantha var. kuehnrichii, haematantha var. fechseri, haematantha var. amblayensis, jajoiana var. paucicostata, jajoiana var. jajoiana, kieslingii, korethroides, marsoneri var. iridescens, marsoneri var. marsoneri, nigricans, pugionacantha, pygmaea, saltensis, sanguiniflora, schreiteri var. riolarensis, schreiteri var. schreiteri, silvestrii, walteri |
| Lobularia | maritima |
| Lockhartia | lunifera |
| Loefgrenianthus | blanche-amesii |
| Logfia | gallica |
| Lolium | multiflorum, perenne, remotum, rigidum ssp. rigidum, rigidum ssp. lepturoides, temulentum |
| Lomanthus | bangii, coscayanus |
| Lomaria | spannagelii |
| Lomaridium | plumieri, schottii |
| Lomariocycas | cycadifolia, magellanica, obtusifolia, schomburghii, yungensis |
| Lomariopsis | marginata |
| Lomatia | dentata, ferruginea, hirsuta ssp. obliqua |
| Lombardochloa | rufa var. rufa, rufa var. sparsepilosa |
| Lonchocarpus | cultratus, lilloi, nitidus, pluvialis, sericeus |
| Lonicera | japonica |
| Lophocarpinia | aculeatifolia |
| Lophopappus | cuneatus, foliosus, tarapacanus |
| Lophophytum | mirabile ssp. bolivianum, mirabile ssp. mirabile, pyramidale |
| Lophosoria | quadripinnata |
| Lophospermum | erubescens |
| Lorentzianthus | viscidus |
| Lorenzochloa | bomanii, henrardiana, mucronata, obtusa, rigidiseta, venusta |
| Lotus | angustissimus, corniculatus, ornithopodioides, pedunculatus, suaveolens, subpinnatus, tenuis |
| Loudetia | flammida |
| Loudetiopsis | chrysothrix |
| Louisiella | elephantipes |
| Loxopterygium | grisebachii |
| Lucilia | acutifolia, ferruginea, kunthiana, linearifolia, lycopodioides, nitens, recurva, tomentosa |
| Lucuma | bifera, venosa |
| Ludwigia | bonariensis, bullata, caparosa, decurrens, elegans, erecta, filiformis, grandiflora, hassleriana, helminthorrhiza, hexapetala, hookeri, humboldtiana, hyssopifolia, irregularis, irwinii, lagunae, laruotteana, leptocarpa, litoranea, longifolia, major, martii, multinervia, myrtifolia, neograndiflora, nervosa, octovalvis, peploides ssp. montevidensis, peploides ssp. peploides, peruviana, pseudonarcissus, quadrangularis, sedoides, sericea, torulosa |
| Luehea | candicans, conwentzii, divaricata, fiebrigii, grandiflora, microcarpa var. polymorpha, microcarpa var. microcarpa, paniculata, speciosa |
| Luetzelburgia | guaissara, sotoi |
| Luffa | aegyptiaca |
| Lulia | nervosa |
| Luma | apiculata, chequen |
| Lunaria | annua |
| Lundia | corymbifera, nitidula, obliqua, virginalis |
| Lupinus | albescens, albus, andicola var. alivillosus, andicola var. grisebachianus, andicola var. subinflatus, andicola var. andicola, andicola var. subacaulis, angustifolius, arboreus, aureonitens, austrorientalis var. austrorientalis, austrorientalis var. umidicola, austrorientalis var. jujuyensis, bracteolaris var. tenuifolius, bracteolaris var. bracteolaris, buchtienii, burkartianus, erectifolius, guaraniticus, heptaphyllus, hieronymi, ignobilis, lanatus, linearis, luteus, magnistipulatus, microcarpus, multiflorus, oreophilus, paraguariensis, paranensis, polyphyllus, reitzii, rubriflorus, sellowianus, tarapacensis, tomentosus, uleanus, ultramontanus, velutinus, werdermannianus |
| Luziola | bahiensis, brasiliensis, fragilis, gracillima, peruviana, spruceana, subintegra |
| Luzula | alopecurus, antarctica, brachyphylla, campestris, chilensis, excelsa, leiboldii, masafuerana, mendocina, ostenii, parvula, peruviana, pumila, racemosa, ruiz-lealii, tristachya, ulei |
| Luzuriaga | marginata, polyphylla, radicans |
| Lycapsus | tenuifolius |
| Lycianthes | asarifolia, fasciculata, lycioides, pauciflora, rantonnetii, repens |
| Lycium | ameghinoi, americanum, athium, barbarum, boerhaviaefolium, bridgesii, cestroides, chanar, chilense var. comberi, chilense var. confertifolium, chilense var. descolei, chilense var. chilense, chilense var. minutifolium, chilense var. glaberrimum, chilense var. filifolium, chilense var. vergarae, ciliatum, ciliatum x cestroides, ciliatum x elongatum, cuneatum, cyathiforme, deserti, distichum, elongatum, elongatum x cestroides, fuscum, gilliesianum, glomeratum, humile, infaustum, leiostemum, minutifolium, morongii, nodosum, pubitubum, rachidocladum, repens, schreiteri, stenophyllum, tenuispinosum var. friesii, tenuispinosum var. tenuispinosum, tenuispinosum var. calycinum, vimineum |
| Lycopodiella | duseniana, geometra, longipes, tupiana |
| Lycopodium | clavatum |
| Lycopsis | arvensis |
| Lycopus | europaeus |
| Lygodium | venustum, volubile |
| Lyroglossa | grisebachii |
| Lysimachia | abscondita, amoena, arvensis, barbata, campestris, catharinensis, filiformis, minima, neolongipedicellata, parvula, sertulata, tenella, verna |
| Lythrum | borysthenicum, hyssopifolia, junceum, maritimum, portula, salicaria |
| Lytoneuron | crenulans, lomariaceum, ornithopus, paradoxum |
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