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| Ecclinusa | ramiflora |
| Eccremocarpus | scaber |
| Echeandia | ciliata, eccremorrhiza |
| Echeveria | argentinensis, argentinensis var. kieslingii, saltensis |
| Echinochloa | chacoënsis, colona, crus-galli var. crus-galli, crus-galli var. mitis, crus-galli var. zelayensis, crus-pavonis, helodes, oryzoides, polystachya var. polystachya, polystachya var. spectabilis |
| Echinodorus | berteroi, floribundus, grandiflorus, longipetalus, longiscapus, macrophyllus, paniculatus, reptilis, scaber, subalatus, uruguayensis |
| Echinopepon | disjunctus, racemosus |
| Echinopsis | albispinosa, ancistrophora, aurea var. albiflora, aurea ssp. aurea, aurea var. fallax, aurea ssp. dobenana, aurea ssp. fallax, leucantha, longispina, mamillosa, oxygona, rhodotricha, tubiflora |
| Echium | plantagineum, vulgare var. vulgare |
| Eclipta | elliptica, megapotamica, prostrata |
| Edmundoa | lindenii var. lindenii, lindenii var. rosea |
| Egeria | densa, najas |
| Egletes | viscosa |
| Ehrharta | longiflora, stipoides, villosa |
| Elachyptera | festiva, micrantha |
| Elaeagnus | angustifolia |
| Elaphoglossum | acutum, alpestre, auricomum, balansae, beaurepairei, brachyneuron, brevipes, burchellii, crassinerve, crassipes, decoratum, didymoglossoides, dutrae, edwallii, flaccidum, fonkii, gayanum, glaziovii, hassleri, horridulum, hybridum, hymenodiastrum, iguapense, itatiayensis, lagesianum, langsdorffii, latifolium, lindenii, lingua, lorentzii, luridum, macahense, macrophyllum, minutum, montanum, nigrescens, pachydermum, papyraceum, paulistanum, porteri, rubicundum, schwackeanum, sellowianum, skottsbergii, spathulatum, squamipes, strictum, subarborescens, subcochleare, tectum, tenax, ulei, vagans, wettsteinii, yungense |
| Elatine | lindbergii, lorentziana, triandra var. triandra, triandra var. brachysperma |
| Eleocharis | acutangula ssp. acutangula, acutangula ssp. breviseta, angustirostris, argentina, atacamensis, atrobrunnea, atropurpurea, baldwinii, barrosii, bicolor, bonariensis, canindeyuensis, capillacea, confervoides, contracta, cordillerana, crinalis, cylindrica, debilis, densicaespitosa, dombeyana, dunensis, elegans, elongata, filiculmis, flavescens, fuscopurpurea, geniculata, glauco-virens, grandirostris, guaglianoniana, hatschbachii, haumaniana, interstincta, jelskiana, kleinii, laeviglumis, lechleri, loefgreniana, macrostachya, maculosa, melanocephala, melanomphala, melanostachys, mendocina, minarum, minima, montana, montevidensis, mutata, nana, neesii, niederleinii, nigrescens, nubigena, nudipes, obtusa, obtusetrigona, occidentalis, ochrostachys, pachycarpa, parodii, parvispicula, pauciglumis, plicarhachis, pseudoalbibracteata, quinquangularis, quinqueflora, rabenii, radicans, ramboana, riograndensis, rostellata, sellowiana, squamigera, subarticulata, tucumanensis, uniflora, urceolatoides, viridans |
| Elephantopus | micropappus, mollis, palustris |
| Eleusine | indica, tristachya |
| Eleutheranthera | ruderalis |
| Eleutherine | bulbosa, latifolia |
| Elionurus | ciliaris, lividus, muticus, tripsacoides |
| Elleanthus | brasiliensis, linifolius |
| Elodea | callitrichoides, potamogeton |
| Eltroplectris | calcarata, paranaensis, schlechterana, triloba |
| Elymus | angulatus, magellanicus, mendocinus, patagonicus, scabrifolius, scabriglumis, x lineariglumis |
| Elytraria | imbricata |
| Elytrigia | repens |
| Elytropus | chilensis |
| Emblica | urinaria |
| Embothrium | coccineum |
| Emilia | fosbergii, sonchifolia |
| Emmeorhiza | umbellata |
| Empetrum | rubrum |
| Encelia | canescens var. oblongifolia, canescens var. canescens, canescens var. parvifolia |
| Encyclia | argentinensis, linearifolioides, oncidioides, osmantha, patens var. patens, patens var. serroniana, pauciflora |
| Endlicheria | paniculata |
| Ennealophus | euryandrus ssp. euryandrus, euryandrus ssp. oxydandrus, fimbriatus, simplex, tucumanensis |
| Enneapogon | desvauxii |
| Enterolobium | contortisiliquum, timbouva |
| Enydra | anagallis, sessilis |
| Ephedra | americana, boelckei, chilensis, gracilis, multiflora, ochreata, triandra, trifurcata, tweediana |
| Epidendrum | anceps, andres-johnsonii, armeniacum, avicula, bermejoense, caldense, coronatum, crassinervium, cristatum, dendrobioides, densiflorum, fulgens, geniculatum, hassleri, henschenii, latilabre, loefgrenii, nocturnum, obergii, paniculatum, parahybunense, paranaense, proligerum, pseudavicula, pseudodifforme, puniceoluteum, purpureum, ramosum, rigidum, rojasii, samaipatense, saxatile, saximontanum, secundum f. albescens, secundum f. secundum, strobiliferum, tridactylum, vesicatum |
| Epilobium | australe, barbeyanum, brachycarpum, campestre, ciliatum, conjugens, densifolium, denticulatum, fragile, glaucum, hirsutum, hirtigerum, nivale, obscurum, puberulum, subdentatum, tetragonum ssp. lamyi |
| Epiphyllum | phyllanthus |
| Epistephium | lucidum, sclerophyllum |
| Equisetum | bogotense, giganteum |
| Eragrostis | acutiglumis, airoides, amabilis, andicola, articulata, atrovirens, attenuata, bahiensis, barrelieri, cataclasta, chiquitaniensis, cilianensis, ciliaris, curvula, hackelii, hypnoides, japonica, kuschelii, lehmanniana, leucosticta, lugens, macrothyrsa, maypurensis, mexicana ssp. mexicana, mexicana ssp. virescens, minor, neesii var. lindmanii, neesii var. neesii, neesii var. expansiflora, nigricans, orthoclada, paniciformis, pastoensis, pectinacea var. pectinacea, pectinacea var. miserrima, perennis, peruviana, pilosa, plana, polytricha, purpurascens, pycnantha, retinens, rojasii, rufescens, seminuda, solida, spicata, tef, tenuifolia, triangularis, trichocolea, weberbaueri |
| Ercilla | spicata, syncarpellata |
| Erechtites | albiflorus, goyazensis, hieraciifolius var. cacalioides, hieraciifolius var. hieraciifolius, ignobilis, leptanthus, missionus, valerianifolius f. valerianifolius, valerianifolius f. organensis, valerianifolius f. reductus |
| Eremocharis | confinis, fruticosa |
| Eriachaenium | magellanicum |
| Erianthecium | bulbosum |
| Erigeron | andicola, campanensis, canadensis, cinereus, corrales-molinensis, fasciculatus, fernandezius, gilliesii, illapelinus, imbricatus, incertus, ingae, karwinskianus, lanceolatus, leiolepis, leptopetalus, luteoviridis, luxurians, myosotis, othonnifolius, patagonicus, pulcher, rosulatus, rupicola, schnackii, stuessyi |
| Eriocaulon | arechavaletae, caaguazuensis, crassiscapum, dictyophyllum, elichrysoides, gomphrenoides, itapevense, leptophyllum, ligulatum, magnificum, magnum, megapotamicum, missionum, modestum, radiosum, reitzii, sellowianum, ulaei, weddellianum |
| Eriocephala | claviceps ssp. itaubensis |
| Eriochloa | acuminata, distachya, grandiflora, montevidensis, nana, polystachya, pseudoacrotricha, punctata, tridentata |
| Eriochrysis | cayennensis, filiformis, holcoides, laxa, villosa |
| Eriogonum | divaricatum |
| Eriolarynx | australis, iochromoides, lorentzii |
| Erioneuron | avenaceum var. kurtzianum, avenaceum var. longiglume, avenaceum var. pygmaeum, pilosum var. longiaristatum, pilosum var. mendocinum |
| Eriope | crassipes ssp. trichopoda, crassipes ssp. crassipes, macrostachya var. macrostachya, macrostachya var. hypoleuca |
| Eriosema | boelckei, campestre var. delicatula, campestre var. macrophyllum, campestre var. campestre, crinitum var. discolor, crinitum var. pulchellum, crinitum var. crinitum, glabrum, hasslerianum, heterophyllum, longiflorum, longifolium, obovatum, platycarpon, rufum var. macrostachyum, rufum var. rufum, simplicifolium, strictum, tacuaremboense, violaceum |
| Eriosyce | aurata var. aurata, aurata var. spinibarbis, ihotzkyana, lapampaensis, megacarpa, rodentiophila |
| Eriotheca | gracilipes, macrophylla, roseorum |
| Erodium | botrys, cicutarium, geoides, malacoides var. malacoides, malacoides var. ribifolium, moschatum |
| Errazurizia | multifoliolata |
| Eruca | vesicaria ssp. sativa, vesicaria ssp. vesicaria |
| Eryngium | absconditum, agavifolium, aloifolium, anomalum, atacamense, balansae, bupleuroides, canaliculatum, cardosii, cerradense, chamissonis, chubutense, ciliatum, coquimbanum, corallinum, coronatum, crassifolium, depressum, divaricatum, dorae, dusenii, ebracteatum, eburneum, echinatum, ekmanii, elegans, eriophorum, eurycephalum, falcifolium, fernandezianum, floribundum, foetidum, glossophyllum, horridum, humifusum, inaccessum, incantatum, irgangii, junceum, juncifolium, koehneanum, lorentzii, luzulifolium, macracanthum, megapotamicum, mesopotamicum, nudicaule, ombrophilum, pandanifolium, paniculatum, paraguariense, plantaginifolium, pohlianum, pristis, pseudojunceum, pulchellum, ramboanum, raulinii, regnellii, rochei, rojasii, rostratum, sanguisorba, sarcophyllum, scirpinum, sellowii, serra, smithii, sparganioides, stenophyllum, subinerme, urbanianum, zosterifolium |
| Erysimum | cheiranthoides, repandum |
| Erythranthe | bridgesii, depressa var. ciminum, depressa var. depressa, glabrata, lutea var. lutea, lutea var. variegata, minima |
| Erythrina | crista-galli var. crista-galli, crista-galli var. leucochloa, crista-galli var. longiflora, falcata, mulungu, similis, speciosa |
| Erythrostemon | angulatus, argentinus, coluteifolius, coulterioides, exilifolius, fimbriatus, gilliesii var. gilliesii, gilliesii var. burkartiana |
| Erythroxylum | ambiguum, anguifugum, argentinum, buxus, campestre, catharinense, cuneifolium, cuspidifolium, deciduum, gonoclados, microphyllum, myrsinites, pachyneurum, paraguariense, patentissimum, pelleterianum, suberosum, substriatum, umbu |
| Escallonia | alpina var. alpina, alpina var. glabrata, angustifolia, bifida, callcottiae, carmelitana, chlorophylla, cordobensis, farinacea, florida, gayana, hypoglauca, illinita var. illinita, illinita var. pubicalycina, laevis, ledifolia, leucantha, megapotamica, millegrana, myrtilloides, myrtoidea, obtusissima, petrophila, pulverulenta var. glabra, pulverulenta var. pulverulenta, revoluta, rosea, rubra var. rubra, rubra var. glutinosa, rubra var. macrantha, rubra var. thalassica, schreiteri, serrata, tucumanensis, virgata |
| Eschscholzia | californica |
| Escobedia | grandiflora |
| Esenbeckia | densiflora, febrifuga, grandiflora, hieronymi, leiocarpa |
| Esterhazya | macrodonta, splendida |
| Eubrachion | ambiguum |
| Eucalyptus | camaldulensis, cinerea, globulus, grandis, quadrangulata, sideroxylon, tereticornis |
| Eucryphia | cordifolia, glutinosa |
| Eugenia | acutata, adenantha, angelyana, angustissima, anomala, arenosa, astrigens, aurata, bacopari, beaurepaireana, bimarginata, bocainensis, brasiliensis, brunneopubescens, bunchosiifolia, burkartiana, candolleana, capitulifera, catharinae, catharinensis, cerasiflora, cereja, chlorophylla, coaetanea, copacabanensis, corrientina, dimorpha, dodonaeifolia, egensis, excelsa, expansa, florida, fusca, gracillima, hamiltonii, handroana, handroi, herbacea, hyemalis var. marginata, hyemalis var. hyemalis, ilhensis, involucrata, janeirensis, joenssonii, kleinii var. kleinii, kleinii var. aristata, leptoclada, ligustrina, lilloana, longipedunculata, macrobracteolata, magnibracteolata, malacantha, mansoni, mattosii, melanogyna, membranifolia, microcarpa, modesta, moraviana, mosenii, multicostata var. multicostata, multicostata var. octocostata, myrcianthes, myrciariifolia, neoglomerata, neomyrtifolia, neosilvestris, neotristis, neoverrucosa, nutans, oblongata, oeidocarpa, ophthalmantha, pachyclada, pantagensis, paracatuana, piloensis, piresiana, pitanga, platysema, pluriflora, prasima, pruinosa, pseudomalacantha, punicifolia, pyriformis var. pyriformis, pyriformis var. argentea, quiriri, ramboi, reitziana, repanda, rojasiana, rostrifolia, rotundicosta, schuechiana, sclerocalyx var. sclerocalyx, sclerocalyx var. cambajuvensis, sonderiana, speciosa, squamiflora, stigmatosa, subavenia, suberosa, subterminalis, suffrutescens, sulcata, supraaxillaris, tenuipedunculata, uniflora, uruguayensis, verticillata, viridiflora |
| Eulophia | alta |
| Eulychnia | acida, aricensis, breviflora, castanea, coquimbana, iquiquensis, saint-pieana, vallenarensis |
| Eumachia | astrellantha, cephalantha, chaenotricha, cymuligera, hassleriana |
| Eupatorium | areniscophilum, gnaphalloides, lineatum, maracayuense, rosengurttii |
| Euphorbia | acerensis, adenoptera, amandi, araucana, argillosa, bahiensis, berteroana, besseri, burkartii, caespitosa var. caespitosa, caespitosa var. ventanicola, catamarcensis, chamaerrhodos, characias, collina var. andina, collina var. chrysophylla, collina var. collina, collina var. glaucescens, collina var. minor, collina var. nahuelhuapina, collina var. patagonica, collina var. spathulata, comosa, copiapina, crypta, cyanofolia, cyathophora, davidii, dentata, dilloniana, dioeca, eichleri, elodes, elquiensis, emarginata, engelmannii, falcata, germainii, graminea, guachanca, guaraniorum, helioscopia, heterophylla, hieronymi, hinkleyorum, hirta var. hirta, hirtella, huanchahana, hunzikeri, hypericifolia, hyssopifolia, insulana, invaginata, klotzschii var. klotzschii, koernerana, kurtzii, lactiflua, lasiocarpa, lathyris, lutulenta, macraulonia, maculata, marayensis, marginata, melicaea, meyeniana, nutans, ophthalmica, oranensis, ovalleana, pampeana, papillosa var. papillosa, papillosa var. cabrerae, paranensis, pedersenii, pentadactyla, peperomioides, peplus, philippiana, platyphyllos, porphyrantha, portucasadiana, portulacoides ssp. collina, portulacoides ssp. major, portulacoides var. acutifolia, portulacoides var. major, portulacoides ssp. portulacoides, potentilloides, prostrata, raphilippii, rhabdodes, rochaensis, ruizlealii, sarcoceras, schickendantzii, sciadophila, selloi, serpens var. microphylla, serpens var. serpens, serpillifolia, spathulata, stenophylla, subilsiae, tarapacana, terracina, thinophila, thymifolia, verna, vervoorstii |
| Euphrasia | achibuenoensis, adenonota, andicola, antarctica, formosissima ssp. formosissima, formosissima ssp. cucharensis, muscosa, officinalis, perpusilla, subexserta, trifida |
| Euplassa | cantareirae, lanata, nebularis |
| Euploca | aurata, campestris, catamarcensis, cerroleonensis, chrysantha, distantiflora, dunaensis, filiformis, krapovickasii, margaritensis , mendocina, ocellata, pallescens, procumbens, salicoides |
| Eupodium | kaulfussii |
| Euryops | chrysanthemoides |
| Eurystyles | actinosophila, cogniauxii, cotyledon, lorenzii |
| Eustachys | bahiensis var. robusta, brevipila, calvescens, distichophylla, paranensis, paspaloides ssp. caribaea, retusa, swalleniana, uliginosa |
| Euterpe | edulis |
| Evolvulus | alsinoides, arizonicus, aurigenius, barbatus, cardiophyllus, chamaepitys var. paraguayensis, chrysotrichos, convolvuloides, corumbaensis, elegans var. capillaceus, filipes, glomeratus ssp. grandiflorus, glomeratus f. echioides, hasslerianus, latifolius, linarioides, niveus, nummularius, pusillus, riedelii, sericeus var. elongatus, sericeus var. sericeus, sericeus f. pedunculatus, serpylloides, tenuis var. cinereus, tenuis var. tenuis |
| Exhalimolobos | burkartii, pazense, weddellii |
| Exodeconus | flavus, integrifolius, pusillus |
| Exostigma | notobellidiastrum, rivulare |
| Exostyles | godoyensis |
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