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| Labatia | gardneriana, salicifolia |
| Lablab | purpureus |
| Laburnum | anagyroides |
| Lachemilla | diplophylla, sandiensis |
| Lachesiodendron | viridiflorum |
| Lachnagrostis | filiformis |
| Lacistema | hasslerianum, lucidum |
| Lactoris | fernandeziana |
| Lactuca | canadensis, saligna, sativa, serriola, virosa |
| Laennecia | altoandina, artemisioides, sophiifolia |
| Lafoensia | nummularifolia, pacari, vandelliana |
| Lagascea | mollis |
| Lagenaria | siceraria |
| Lagenocarpus | rigidus ssp. tenuifolius, rigidus ssp. rigidus |
| Lagenophora | hariotii, hirsuta, nudicaulis |
| Laguncularia | racemosa |
| Lagurus | ovatus |
| Lamanonia | cuneata, ternata |
| Lamarckia | aurea |
| Lamium | amplexicaule, purpureum |
| Lampayo | castellani, 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 | berteroanus, cabrerianus, campestris, cicera, crassipes, cryophilus, 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, paraguariensis, paranensis, parodii var. parodii, parodii var. brevipetiolata, pastorei, pubescens var. pubescens, pubescens var. monticola, pusillus, sativus, subandinus, subulatus, tomentosus, tropicalandinus |
| Latua | pubiflora |
| Laurelia | sempervirens |
| Laureliopsis | philippiana |
| Laurembergia | tetrandra |
| Lavoisiera | imbricata, pulchella |
| Leandra | angustifolia, cordigera var. transiens, eriocalyx, humilis, miconiastrum, salicina, strigilliflora var. strigilliflora, strigilliflora var. australis, ulaei |
| 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 | alopecuroides, alvarezia, diffusa, meridionalis |
| Lepidaploa | amambaia, argyrotricha, balansae, chamissonis, decumbens, eriolepis, novarae, pseudomuricata, psilostachya, remotiflora, salzmanii, 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, rahmeri, raimondii, reichei, rhytidocarpum, ruderale, santacruzensis, sativum, serratum, spathulatum, spicatum, strictum, stuckertianum, tandilense, virginicum |
| Lepidoceras | chilense |
| Lepidophyllum | cupressiforme |
| Lepidothamnus | fonkii |
| Lepismium | lineare, warmingianum |
| Leptinella | scariosa |
| Leptocarpha | rivularis |
| Leptochloa | chloridiformis, crinita, pluriflora, virgata |
| Leptoglossis | linifolia |
| Leptosiphon | pusillus |
| Leptospron | adenanthum |
| Leptostelma | catharinense, maxima, meyeri, tucumanense, tweediei |
| Leptotes | bicolor, tenuis, unicolor |
| Lepturus | repens |
| Lepuropetalon | spathulatum |
| Lessingianthus | alegretensis, arachniolepis, argenteus, asteriflorus, bardanoides, bellulus, brevifolius, cataractum, centauropsideus, concepcionis, constrictus, correntinus, durus, elegans, exiguus, glabratus var. glabratus, glabratus var. angustifolius, grandiflorus, hasslerianus, hypochaeris, intermedius, 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, diemii var. purpurea, eriocephala, floribunda, gayana, gilliesii, glacialis, graui, hieracioides, integrifolia, lithospermifolia ssp. lithospermifolia, meladensis, nutans, polyclados, purpurea, rosea, runcinata, salina ssp. salina, scrobiculata, suaveolens, tomentosa, viscida |
| Leucochloron | incuriale |
| Leucocoryne | alliacea, angosturae, appendiculata, arrayanensis, candida, codehuensis, conconensis, conferta, conostyla, coquimbensis var. coquimbensis, coquimbensis var. alba, coronata, curacavina, dimorphopetala, editiana, foetida, fragrantissima, fuscostriata, gilliesioides, inclinata, ixioides, leucogyna, lilacea, lituecensis, lurida, macropetala, maulensis, modesta, mollensis, montana, pachystyla, porphyrea, praealta, purpurea, quilimarina, roblesiana, rungensis, simulans, subulata, taguataguensis, talinensis, tricornis, ungulifera, valparadisea, violacescens, vittata |
| Leucojum | vernum |
| Leucostele | litoralis, nigripilis, skottsbergii |
| Leucotrichum | organense, schenckii |
| Leunisia | laeta |
| Levisticum | officinale |
| Leymus | arenarius, erianthus |
| Liabum | acuminatum |
| Libertia | chilensis, sessiliflora, tricocca |
| Libidibia | paraguariensis |
| Licaria | armeniaca |
| Ligaria | cuneifolia |
| Ligeophila | juruensis, rosea |
| Ligustrum | lucidum, ovalifoliium, 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 | dubia, rotundifolia |
| Lindsaea | arcuata, bifida, botrychioides, guianensis ssp. lancecastrum, guianensis ssp. guianensis, 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 | aberrans, alba var. lanceolata, alba var. alba, angustifolia, arechavaletae, aristata, asperrima, balansae, brasiliensis, campestris, coarctata, coriacea, crucifera, ekmanii, felippei, fragrans, grandiflora, grata, grisebachiana, hassleriana, hieracifolia, hirta, junelliana, lamiana, lasiocalycina, lasiocalyx, lippioides, longepedunculata, lupulina, origanoides, paranensis, pumila, recolletae, rodriguezii, salsa, sandwithiana, sclerophylla, suffruticosa, tegulifera, tristis, 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, paranaensis, polyphylla, reniformis, stellfeldii, tupa, xalapensis |
| Lobivia | bonnieae, bruchii, chrysantha var. chrysantha, chrysantha var. hypocyrta, chrysochete var. minutiflora, chrysochete var. chrysochete, crassicaulis, densispina, famatimensis var. famatimensis, famatimensis var. sanjuanensis, 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 | ludibunda, lunifera |
| Loefgrenianthus | blanche-amesii |
| Logfia | gallica |
| Lolium | multiflorum, perenne, remotum, rigidum ssp. rigidum, rigidum ssp. lepturoides, temulentum |
| Lomanthus | bangii |
| Lomaria | spannagelii |
| Lomaridium | acutum, 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 | leandri, mirabile ssp. bolivianum, mirabile ssp. mirabile |
| Lophosoria | quadripinnata |
| 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 ssp. grandiflora, grandiflora ssp. hexapetala, hassleriana, helminthorrhiza, 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 |
| Luetzelburgia | guaissara |
| Luffa | aegyptiaca |
| Lulia | nervosa |
| Luma | apiculata, chequen |
| Lunaria | annua |
| Lundia | corymbifera, virginalis |
| Lupinus | albescens, albus, andicola var. alivillosus, andicola var. grisebachianus, andicola var. subinflatus, andicola var. andicola, andicola var. subacaulis, angustifolius, arboreus, aureonitens, austrorientalis, bracteolaris var. leptophyllus, bracteolaris var. tenuifolius, bracteolaris var. bracteolaris, buchtienii, burkartianus, erectifolius, gibertianus var. reineckianus, gibertianus var. gibertianus, gibertianus var. berroanus, guaraniticus, hieronymi, honoratus, ignobilis, intortus, jujuyensis, lanatus, linearis, luteus, magnistipulatus, microcarpus, multiflorus, opertospicus, oreophilus, paraguariensis, paranensis, polyphyllus, reitzii, rubriflorus, sellowianus, tafiensis, tarapacensis, tomentosus, tucumanensis, uleanus, ultramontanus, umidicola, 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 |
| Lysimachia | |
| Lythrum | borysthenicum, hyssopifolium, junceum, maritimum, portula, salicaria |
| Lytoneuron | crenulans, lomariaceum, ornithopus, paradoxum |
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