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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 |
| 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, 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, rigidum, 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, emarginata, exigua, 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, quinqueflora, rabenii, 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, 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, samaipatense, saxatile, saximontanum, secundum f. albescens, secundum f. secundum, strobiliferum, tridactylum, vesicatum |
| Epilobium | australe, barbeyanum, brachycarpum, campestre, ciliatum, conjungens, densifolium, denticulatum, fragile, glaucum, hirsutum, hirtigerum, nivale, obscurum, puberulum, subdentatum, tetragonum ssp. lamyi |
| Epiphyllum | phyllanthus |
| Epistephium | sclerophyllum, williamsii |
| Equisetum | bogotense, giganteum, xylochaetum |
| 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, karvinskianus, lanceolatus, leiolepis, leptopetalus, luteoviridis, luxurians, myosotis, othonnifolius, patagonicus, pulcher, rosulatus, rupicola, schnackii, stuessyi |
| Eriocaulon | arechavaletae, caaguazuensis, crassiscapum, dictyophyllum, elichrysoides, gomphrenoides, leptophyllum, ligulatum, magnificum, magnum, megapotamicum, missionum, modestum, 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. delicatulum, 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, ihotzkyanae, lapampaensis, megacarpa, rodentiophila, tuberculosa |
| 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, astringens, aurata, bacopari, beaurepairiana, bimarginata, brasiliensis, brunneopubescens, bunchosiifolia, burkartiana, candolleana, catharinae, catharinensis, cerasiflora, cereja, chlorophylla, coaetanea, copacabanensis, corrientina, dimorpha, disperma, dodonaeifolia, egensis, excelsa, expansa, florida, fusca, gracillima, hamiltonii, handroana, handroi, hyemalis var. marginata, hyemalis var. hyemalis, ilhensis, involucrata, janeirensis, joenssonii, kleinii var. kleinii, kleinii var. aristata, leptoclada, ligustrina, lilloana, longipedunculata, macrobracteolata, magnibracteolata, malacantha, mansoi, mattosii, melanogyna, membranifolia, modesta, mosenii, multicostata var. multicostata, multicostata var. octocostata, myrcianthes, myrciariifolia, neomyrtifolia, neosilvestris, neotristis, neoverrucosa, nutans, oeidocarpa, pachyclada, pantagensis, paracatuana, piloesis, piresiana, pisiformis, pitanga, platysema, pluriflora, prasina, pruinosa, pseudomalacantha, punicifolia, pyriformis var. pyriformis, pyriformis var. argentea, quiriri, ramboi, reitziana, repanda, rojasiana, rostrifolia, rotundicosta, sclerocalyx var. sclerocalyx, sclerocalyx var. cambajuvensis, sonderiana, speciosa, squamiflora, stigmatosa, subavenia, suberosa, subglomerata, subterminalis, sulcata, supra-axillaris, 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, gnaphalioides, lineatum, maracayuense, rosengurttii |
| Euphorbia | acerensis, adenoptera, amandi, andina, araucana, argillosa, bahiensis, berteroana, besseri, burkartii, caespitosa, catamarcensis, chamaerrhodos, comosa, copiapina, crypta, cyanofolia, cyathophora, davidii, dilloniana, dioeca, eichleri, elodes, elquiensis, engelmannii, falcata, germainii, graminea, guachanca, guaraniorum, helioscopia, heterophylla, hieronymi, hinkleyorum, hirta var. hirta, hirtella, hunzikeri, hypericifolia, hyssopifolia, insulana, invaginata, klotzschii var. klotzschii, kurtzii, lactiflua, lasiocarpa, lathyris, lutulenta, macraulonia, maculata, marayensis, marginata, melicaea, meyeniana, ophthalmica, oranensis, ovalleana, pampeana, papillosa var. papillosa, paranensis, pedersenii, pentadactyla, peperomioides, peplus, philippiana, platyphyllos, porphyrantha, portulacoides ssp. collina, portulacoides ssp. major, portulacoides ssp. portulacoides, potentilloides, prostrata, raphilippii, rhabdodes, rochaensis, ruizlealii, sarcoceras, schickendantzii, sciadophila, selloi, 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, splendissima |
| 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, pazensis, weddellii |
| Exodeconus | flavus, integrifolius, pusillus |
| Exostigma | notobellidiastrum, rivulare |
| Exostyles | godoyensis |
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