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| Babiania | angustifolia |
| Baccharis | acaulis, albida, albilanosa, aliena, alnifolia, alpina, amambayensis, angusticeps, anomala, aphylla, apicifoliosa, aracatubensis, arenaria, argentina, artemisioides, articulata, axillaris, boliviensis, brachylaenoides var. polycephala, breviseta, cabrerae, caespitosa, calliprinos, calvescens, camporum f. camporum, camporum f. parvifolia, capitalensis, caprariifolia, chionolaenoides, clavata, cognata, concava, concinna, conyzoides, cordobensis, coridifolia, coronata, crispa, cultrata, curitybensis, cymosa, darwinii, deblei, deltoidea, dentata, divaricata, dracunculifolia ssp. tandilensis, dracunculifolia ssp. dracunculifolia, dunensis, effusa, elaeoides, elliptica, erigeroides, erioclada, famatinensis, fimbriata, flabellata, flexuosiramosa, floccosa, frenguellii, funkiae, genistelloides, genistifolia, gibertii, gilliesii, glaziovii, glutinosa, gnaphalioides, gracilis, grandimucronata, grisebachii, helichrysoides, hirta, humilis, hyemalis, hypericifolia, illinitoides, incisa, inexspectata, intermedia, intermixta, isabelae, itapirocensis, jocheniana, juncea ssp. juncea, junciformis, kurtziana, lateralis, latifolia, leucocephala, leucopappa, lilloi, linearifolia ssp. polycephala, linearifolia ssp. linearifolia, linearis ssp. linearis, longiattenuata, lycioides, lymanii, macraei, magellanica, malmei, megapotamica var. megapotamica, megapotamica var. weirii, melanopotamica, mesoneura, microcephala, microdonta, milleflora, minor, minutiflora, montana, multiflosculosa, multifolia, mylodontis, myricifolia, napaea, neaei, nebularis, neorupestris, neotruncata, niederleinii var. niederleinii, nitida, nivalis, notosergila, nummularia, oblongifolia, obovata, ochracea, opuntioides, oreophila, organensis, oxyodonta, palustris, pampeana, paniculata, paranensis, patagonica ssp. patagonica, patagonica ssp. palenae, patens, paucicostata, pauciflosculosa, pedersenii, penningtonii, pentaptera, pentodonta, pentziifolia var. pentziifolia, perulata, petraea, petrophila, phylicifolia, phyteuma, phyteumoides, pilcensis, pluricapitulata, poeppigiana ssp. austropedicellata, poeppigiana ssp. poeppigiana, poeppigiana ssp. ocellata, polifolia, polygama, potrerillana, pseudomyriocephala, pseudovillosa, psiadioides, pulchella, punctulata, pycnantha, pycnocephala, quitensis, racemosa, ramboi, rectialata, retamoides, reticularia, reticularioides, retusa, rhexioides, rhomboidalis ssp. rhomboidalis, riograndensis, rodriguezii, rufescens var. ventanicola, sagittalis, salicifolia, samensis, santelicis, scabrifolia, scopulorum, sculpta, selloi, semiserrata, sessiliflora, sessilifolia, singularis, spartioides, sphaerocephala, sphagnophila, spicata, stenophylla, subdentata, suberectifolia, subtropicalis, taltalensis, tarchonanthoides, tenella, tenuiptera, thymifolia, tola ssp. tola, tola var. incarum, tola ssp. altiplanicola, triangularis, tridentata, trilobata, trimera, trinervis var. debilis, trinervis var. trinervis, trineura, tucumanensis, uleana, ulicina, umbellata, uncinella, urvilleana, vernalis, vernicosa, vincifolia, viscosissima, vismioides, vulneraria, zoellneri ssp. zoellneri |
| Bacopa | australis, axillaris, congesta, dubia, gratioloides, lanigera, monnieri, monnierioides, myriophylloides, paraguariensis, repens, rotundifolia, salzmannii, scabra var. laxiflora, scabra var. scabra, serpyllifolia, stricta, verticillata |
| Bactris | gasipaes, glaucescens, hatschbachii, setosa, vulgaris |
| Bahia | ambrosioides |
| Bakerolimon | plumosum |
| Balbisia | aphanifolia, calycina, gracilis, microphylla, miniata var. anomala, miniata var. miniata, peduncularis, stitchkinii, verticillata |
| Balbisia | |
| Balfourodendron | riedelianum |
| Ballota | nigra ssp. velutina, nigra ssp. nigra, nigra ssp. foetida |
| Balsamocarpon | brevifolium |
| Baltimora | geminata |
| Banara | arguta, parviflora, tomentosa, umbraticola |
| Banisteriopsis | acerosa, adenopoda, argyrophylla, caapi, campestris, confusa, ferruginea, laevifolia, malifolia, muricata, nummifera, oxyclada, paraguariensis, parviflora, pseudojanusia, pulchra, variabilis |
| Barbacenia | paranaensis |
| Barbaceniopsis | boliviensis, castillonii, humahuaquensis |
| Barbarea | verna, vulgaris |
| Barbosella | australis, cogniauxiana, crassifolia, dusenii, gardneri, miersii, trilobata |
| Barjonia | erecta |
| Barleria | repens |
| Barnadesia | odorata |
| Barneoudia | balliana, chilensis, major var. patagonica, major var. major |
| Barrosoa | betoniciformis, cabrerae, candolleana, ramboi |
| Basistemon | spinosus |
| Baskervilla | paranaensis |
| Bassia | hyssopifolia, scoparia |
| Bastardia | viscosa |
| Bastardiopsis | densiflora |
| Bathysa | australis |
| Bauhinia | acuruana, affinis, amambayensis, argentinensis var. megasiphon, argentinensis var. argentinensis, bauhinioides, cheilantha, estrellensis, forficata ssp. pruinosa, forficata ssp. forficata, hagenbeckii, holophylla, kleiniana, longifolia, mollis var. notophila, mollis var. mollis, ungulata var. cuiabensis, ungulata var. ungulata, uruguayensis, variegata var. candida |
| Beauverdia | dialystemon, hirtella ssp. glabrata, hirtella ssp. lorentzii, hirtella ssp. hirtella, sellowiana, vittata |
| Becquerelia | cymosa, muricata |
| Begonia | angularis, angulata, balansae, barkleyana, biguassuensis, boliviensis, calvescens, campos-portoana, capanemae, catharinensis, ciliatifolia, cinnabarina, coccinea, convolvulacea, cucullata, descoleana, echinosepala var. elongatifolia, echinosepala var. echinosepala, fiebrigii, fischeri, fruticosa, fuscocaulis, garuvae, hilariana, hirtella, hispida, huegelii, incisoserrata, inermis, insularis, isopterocarpa, itatinensis, itupavensis, konder-reisiana, lineolata, lucidissima, marinae, medeirosii, micranthera, obovatistipula, paleata, paranaensis, parvistipulata, per-dusenii, pilgeriana, pluvialis, polyandra, pulchella, radicans, rubricaulis, rufosericea, rupium, scharfii, serranegrae, sleumeri, solitudinis, squamipes, stenolepis, subvillosa, tafiensis, trevisoensis, valdensium, veitchii, wollnyi |
| Behuria | insignis |
| Beilschmiedia | berteroana, miersii |
| Bejaranoa | balansae |
| Belamcanda | chinensis |
| Bellardia | trixago, viscosa |
| Bellis | perennis |
| Belloa | chilensis, eriophora, nivea |
| Beloglottis | boliviensis |
| Benthamiella | azorella, azorelloides, chubutensis, graminifolia, lanata, longifolia, nordenskioldii, patagonica, pycnophylloides, skottsbergii, sorianoi, spegazziniana |
| Berberidopsis | corallina, granitica |
| Berberis | actinacantha, andeana, argentinensis, bidentata, burruyacuensis, buxifolia, cabrerae, calilehua, campos-portoi, chilensis var. brachybotria, chilensis var. chilensis, chillanensis, comberi, commutata, congestiflora, copahuensis, corymbosa, darwinii, empetrifolia, fiebrigii, glomerata, grevilleana, heterophylla, hieronymi, horrida, ilicifolia, jobii, jujuyensis, laurina, lilloana, litoralis, masafuerana, michay, microphylla, mikuna, montana, montevidensis, negeriana, parodii, rotundifolia, ruscifolia, sellowiana, serratodentata, trigona, valdiviana |
| Bernardia | alarici, argentinensis, asplundii, caperoniifolia, flexuosa, fluviatilis, hassleriana, leptostachys, longipedunculata, odonellii, paraguariensis, polymorpha var. curuguatensis, polymorpha var. polymorpha, polymorpha var. setosa, pulchella, sellowii, simplex |
| Berroa | gnaphalioides |
| Bertolonia | acuminata, leuzeana, mosenii, paranaensis |
| Beschorneria | yuccoides |
| Besleria | selloana |
| Beta | vulgaris ssp. vulgaris, vulgaris ssp. maritima |
| Betencourtia | australis, gracillima, martioides, neesii, scarlatina |
| Betula | pendula |
| Bia | alienata |
| Bidens | alba, andicola var. cosmantha, andicola var. andicola, aurea, bipinnata, chodatii, exigua, gardneri, hassleriana, laevis, mandonii, pilosa var. pilosa, pilosa var. apiifolia, pilosa var. alausensis, pseudocosmos, reptans, riedelii, segetum, subalternans var. unipinnata, subalternans var. simulans, subalternans var. subalternans, tenera, triplinervia var. macrantha, triplinervia var. triplinervia |
| Bifrenaria | aureo-fulva, harrisoniae var. grandiflora, harrisoniae var. harrisoniae, harrisoniae var. pubifera, inodora, racemosa, stefanae, tetragona |
| Bignonia | binata, callistegioides, decora, sciuripabulum |
| Billbergia | alfonsi-joannis, amoena var. viridis, amoena var. amoena, distachia var. distachia, distachia var. straussiana, distachia var. concolor, distachia var. maculata, magnifica var. acutisepala, magnifica var. magnifica, nutans, porteana, pyramidalis, schimperiana, zebrina |
| Bipinnula | biplumata, fimbriata, gabriel, gibertii, montana, penicillata, plumosa, polysyka, taltalensis, volckmannii |
| Bishovia | mikaniifolia |
| Bixa | orellana |
| Blackstonia | perfoliata |
| Blandowia | striata |
| Blechnum | arcuatum, asplenioides, auriculatum, austrobrasilianum, blechnoides, gracile, hastatum, laevigatum, lanceola, ludificans, malacothrix, mochaenum var. achalense, moritzianum, occidentale, paschale, polypodioides, x caudatum, x leopoldense |
| Blennosperma | chilense |
| Blepharidachne | benthamiana, hitchcockii |
| Blepharocalyx | cruckshanksii, salicifolius |
| Blepharodon | ampliflorum, angustifolium, bicuspidatum, lineare, pictum, reflexum |
| Bletia | catenulata, wagenerii |
| Blitum | antarcticum, nuttallianum |
| Blossfeldia | liliputana |
| Blotiella | lindeniana |
| Blumenbachia | catharinensis, dissecta, eichleri, exalata, hieronymi, insignis, latifolia, prietea, scabra, sylvestris |
| Bocconia | integrifolia |
| Boehmeria | caudata, cylindrica, excelsa, nivea, pavonii, ramiflora |
| Boerhavia | coccinea, cordobensis, diffusa var. diffusa, diffusa var. leiocarpa, pulchella, spicata |
| Bolax | bovei, gummifera |
| Bolbitis | curupirae, serratifolia |
| Bolboschoenus | maritimus ssp. maritimus, maritimus ssp. paludosus, robustus |
| Boldrinia | parodiana |
| Bomarea | boliviensis, dulcis, edulis, involucrosa, macrocephala, ovallei, salsilla, stans |
| Bonamia | agrostopolis, balansae, sericea var. latifolia, sericea var. sericea, subsessilis |
| Boopis | eryngioides, horrida, leucanthema, pterocalyx, pusilla, sessiliflora, sympaganthera |
| Boquila | trifoliolata |
| Borago | officinalis |
| Bordasia | bicornis |
| Borreria | alata, argentea, brachystemonoides, brownii, cupularis, dasycephala, kelleri, krapocarmeniana, latifolia, loretiana, marticrovettiana, multibracteata, nelidae, ocymifolia, orientalis, orinocensis, paranaensis, poaya, pulchristipula, remota, rubrostipulata, runkii, schumannii, spinosa, suaveolens, sulcata, tenera, verticillata, warmingii |
| Bothriochloa | alta, barbinodis, bladhii, catharinensis, edwardsiana, eurylemma, exaristata, imperatoides, ischaemum, laguroides, longipaniculata, meridionalis, perforata, saccharoides var. parvispicula, saccharoides var. saccharoides, saccharoides ssp. australis, springfieldii, torreyana, velutina |
| Botrychium | dusenii |
| Botrypus | virginianus |
| Bouchea | boliviana, fluminensis var. fluminensis, fluminensis f. albiflora |
| Bouchetia | anomala |
| Bougainvillea | campanulata, glabra var. glabra, glabra var. graciliflora, infesta, praecox, spectabilis, spinosa, stipitata |
| Bouteloua | aristidoides, barbata, curtipendula var. caespitosa, media, megapotamica, simplex |
| Bowdichia | virgilioides f. virgiloides, virgilioides f. major |
| Bowlesia | flabilis, hieronymusii, incana, lobata, macrophysa, paposana, platanifolia, ruiz-lealii, sodiroana, tropaeolifolia, uncinata, venturii |
| Brachionidium | restrepioides |
| Brachyclados | caespitosus, lycioides, megalanthus |
| Brachylaena | discolor |
| Brachyotum | microdon |
| Brachypodium | distachyon, sylvaticum |
| Brachystele | arechavaletae, bicrinita, bracteosa, burkartii, camporum, cyclochila, delicatula, dilatata, icmadophila, morronei, scabrilingua, subfiliformis, unilateralis, widgrenii |
| Brargentina | bornmulleri |
| Brasiliopuntia | brasiliensis, schulzii |
| Brasiliorchis | chrysantha, picta |
| Brassavola | ceboletta, tuberculata |
| Brassica | juncea, napus, nigra, oleracea, rapa, tournefortii |
| Brayopsis | calycina, monimocalyx |
| Bredemeyera | brevifolia, floribunda, laurifolia |
| Breynia | disticha |
| Brickellia | diffusa |
| Bridgesia | incisifolia |
| Briquetia | denudata |
| Briza | itatiaiae, maxima, media, minor |
| Bromelia | antiacantha, balansae, hieronymi, serra |
| Bromidium | anomalum, hygrometricum, ramboi var. ramboi, ramboi var. pubescens, tandilense, trisetoides |
| Bromus | araucanus, arvensis, auleticus, berteroanus, bonariensis, brachyanthera var. brachyanthera, brachyanthera var. uruguayensis, catharticus var. elata, catharticus var. catharticus, catharticus var. rupestris, coloratus, commutatus, erectus, flexuosus var. flexuous, flexuosus var. famatinensis, gunckelii, hordeaceus, inermis, japonicus, lanatus, lanceolatus, lithobius, madritensis, mango, modestus, parodii, pellitus, racemosus, rigidus, rubens, scoparius, secalinus, setifolius var. setifolius, setifolius var. pictus, setifolius var. brevifolius, squarrosus, sterilis, tectorum, tunicatus |
| Brosimum | gaudichaudii, glaziovii, lactescens |
| Broussonetia | papyrifera |
| Browningia | caineana, candelaris |
| Brugmansia | suaveolens |
| Brunfelsia | australis, brasiliensis ssp. macrocalyx, brasiliensis ssp. brasiliensis, cuneifolia, pauciflora, pilosa, plowmaniana, uniflora |
| Buchnera | amethystina, juncea, lavandulacea, longifolia, palustris, ternifolia |
| Buchtienia | boliviensis |
| Buddleja | araucana, aromatica, bordignonii, brachiata, cestriflora, cordobensis, cuneata, davidii, diffusa, elegans ssp. angustata, elegans ssp. elegans, globosa, grandiflora, hatschbachii, hieronymi, iresinoides, kleinii, madagascariensis, mendozensis, misionum, oblonga, ramboi, stachyoides, suaveolens, thyrsoides ssp. angusticarpa, thyrsoides ssp. thyrsoides, tubiflora, tucumanensis |
| Buglossoides | arvensis |
| Bulbophyllum | atropurpureum, chloroglossum, dusenii, epiphytum, gladiatum, glutinosum, granulosum, laciniatum var. laciniatum, laciniatum var. janeirense, luederwaldtii, malachadenia, mentosum, meridense, micranthum, napelli, paranaense, perii, plumosum, punctatum, regnellii, rupicola, teresense, tessenianum, tripetalum, warmingianum, x guartelae |
| Bulbostylis | amambayensis, arenaria, aspera, brevifolia, capillaris var. pyriformis, capillaris var. microstachys, capillaris var. capillaris, communis var. scabrida, communis var. communis, conifera, conostachya, consanguinea, contracta, edwalliana, eleocharoides, fendleri, fimbriata, funckii, guaglianoneae, hirtella, jacobinae, junciformis, juncoides f. hirtella, juncoides f. subfimbriata, juncoides var. nana, juncoides var. ampliceps, juncoides var. juncoides, juncoides var. lorentzii, loefgrenii, papillosa, paradoxa, rugosa, scabra, sellowiana, sphaerocephala var. brunneo-vaginata, sphaerocephala var. sphaerocephala, sphaerolepis, stenocarpa, subtilis, svensoniana, tenuifolia, truncata, vestita, wanderleyana |
| Bulnesia | chilensis, foliosa, retama, schickendantzii |
| Bunchosia | maritima, pallescens, paraguariensis |
| Burkartia | lanigera |
| Burmannia | alba, australis, capitata, flava |
| Butia | campicola, capitata, catarinensis, eriospatha, exilata, exospadix, lallemantii, leptospatha, marmorii, microspadix, noblickii, odorata, paraguayensis, poni, pubispatha, witeckii, yatay |
| Byrsonima | brachybotrya, coccolobifolia, crassifolia, intermedia, ligustrifolia, myricifolia, niedenzuiana, paulista, psilandra, subterranea, umbellata, verbascifolia |
| Byttneria | acalyphifolia, australis, catalpifolia ssp. sidifolia, dentata, divaricata var. guaranitica, filipes, gracilipes, hatschbachii, implacabilis, oblongata, oranensis, ostenii, palustris, pedersenii, ramosissima, rhamnifolia, rojasii, scabra, stenophylla, subsessilis, triadenia, urticifolia |
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