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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, 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, heeringiana, 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, 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, sagittalis, salicifolia, samensis, santelicis, scabrifolia, scopulorum, sculpta, semiserrata, sessiliflora, singularis, spartioides, sphaerocephala, sphagnophila, spicata, stenophylla, subdentata, suberectifolia, subtropicalis, taltalensis, tarchonanthoides, tenella, tenuiptera, thymifolia, tola ssp. tola, tola var. incarum, triangularis, tridentata, trilobata, trimera, trinervis var. debilis, trinervis var. trinervis, trineura, tucumanensis, uleana, ulicina, umbellata, uncinella, urvilleana, vernalis, vernicosa, vincifolia, viscosissima, vismioides, vulneraria, wagenitzii, zoellneri ssp. zoellneri |
| Bacopa | australis, axillaris, congesta, dubia, gratioloides, lanigera, monnieri, monnierioides, myriophylloides, paraguariensis, repens, rotundifolia, salzmannii, scabra var. laxiflora, scabra var. scabra, scoparioides, 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 |
| Balfourodendron | riedelianum |
| Ballota | nigra ssp. nigra, nigra ssp. velutina, nigra ssp. foetida |
| Balsamocarpon | brevifolium |
| Baltimora | geminata |
| Banara | arguta, brasiliensis, parviflora, tomentosa, umbraticola |
| Banisteriopsis | acerosa, adenopoda, argyrophylla, caapi, campestris, confusa, 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 |
| 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. cuyabensis, 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, fiebrigii, fischeri, fruticosa, fuscocaulis, garuvae, hammoniae, hilariana, hirtella, hispida, huegelii, incisoserrata, inermis, isopterocarpa, itatinensis, itupavensis, konder-reisiana, lineolata, lucidissima, marinae, medeirosii, micranthera, obovatistipula, paleata, paranaensis, parvistipulata, perdusenii, pilgeriana, pluvialis, polyandra, pulchella, radicans, rubricaulis, rufosericea, rupium, scharffii, serranegrae, sleumeri, solitudinis, squamipes, stenolepis, subvillosa, tafiensis, trevisoensis, valdensium, veitchii, vicina, wollnyi |
| Beilschmiedia | berteroana, emarginata, miersii |
| Bejaranoa | balansae |
| 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, spartioides |
| Berroa | gnaphalioides |
| Bertolonia | acuminata, leuzeana, margaritacea, mosenii, paranensis |
| Beschorneria | yuccoides |
| Besleria | selloana |
| Beta | vulgaris ssp. vulgaris, vulgaris ssp. maritima |
| Betencourtia | australis, gracillima, martioides, neesii, scarlatina |
| Betula | pendula |
| Bia | alienata |
| Biancaea | decapetala |
| Bidens | andicola var. andicola, andicola var. heterophylla, aurea, bipinnata, chodatii, exigua, gardneri, hassleriana, laevis, mandonii, pilosa var. pilosa, pilosa var. apiifolia, pseudocosmos, reptans, riedelii, squarrosa, subalternans var. unipinnata, subalternans var. subalternans, subalternans var. simulans, tenera, triplinervia var. macrantha, triplinervia var. triplinervia |
| Bifrenaria | aureofulva, hadwenii, harrisoniae, inodora, racemosa, stefanae, tetragona |
| Bignonia | binata, callistegioides, decora, sciuripabulum |
| Billbergia | alfonsi-joannis, amoena var. amoena, amoena var. viridis, distachia var. distachia, distachia var. straussiana, distachia var. concolor, distachia var. maculata, magnifica, nutans, porteana, pyramidalis, 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, gracile, hastatum, laevigatum, lanceola, ludificans, malacothrix, moritzianum, occidentale, polypodioides, x caudatum, x leopoldense, x pampasicum |
| Blennosperma | chilense |
| Blepharidachne | benthamiana, hitchcockii |
| Blepharocalyx | cruckshanksii, salicifolius |
| Blepharodon | ampliflorum, angustifolium, bicuspidatum, lineare, pictum, reflexum |
| Bletia | catenulata, wageneri |
| 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, ovata, 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 |
| Bouchetia | anomala |
| Bougainvillea | campanulata, glabra var. glabra, infesta, praecox, spectabilis, spinosa, stipitata |
| Bouteloua | aristidoides, barbata, curtipendula var. caespitosa, media, megapotamica, simplex |
| Bowdichia | virgilioides f. virgilioides |
| 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, morronei, scabrilingua, subfiliformis, unilateralis, widgrenii |
| Brargentina | bornmulleri |
| Brasiliopuntia | brasiliensis, schulzii |
| Brasiliorchis | chrysantha, picta |
| Brassavola | ceboletta, tuberculata |
| Brassica | juncea, napus, oleracea, rapa, tournefortii |
| Brayopsis | calycina, monimocalyx |
| Bredemeyera | brevifolia, floribunda, laurifolia |
| Breynia | disticha |
| Brickellia | diffusa |
| Bridgesia | incisifolia |
| Briquetia | denudata |
| Briza | maxima, media, minor |
| Bromelia | antiacantha, balansae, hieronymi, serra, urbaniana |
| Bromus | alonsae, araucanus, arvensis, auleticus, berteroanus, bonariensis, brachyanthera var. brachyanthera, brachyanthera var. uruguayensis, catharticus var. elatus, catharticus var. rupestris, catharticus var. catharticus, 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 |
| Bronwenia | ferruginea |
| Brosimum | gaudichaudii, glaziovii, lactescens |
| Broussonetia | papyrifera |
| Browningia | caineana, candelaris |
| Brugmansia | americana, suaveolens |
| Brunfelsia | australis, brasiliensis ssp. macrocalyx, brasiliensis ssp. brasiliensis, cuneifolia, pauciflora, pilosa, plowmaniana, uniflora |
| Buchnera | amethystina, juncea, lavandulacea, longifolia, palustris, ternifolia |
| Buchtienia | boliviensis, nitida |
| 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, exaltatum, gladiatum, glutinosum, granulosum, malachadenia, mentosum, meridense, micranthum, napelli, perii, plumosum, regnellii, rupicola, tripetalum, x guartelae |
| Bulbostylis | amambayensis, aspera, brevifolia, capillaris var. capillaris, communis var. communis, communis var. scabrida, conifera, conostachya, consanguinea, contracta, edwalliana, eleocharoides, fimbriata, funckii, guaglianoneae, jacobinae, junciformis, juncoides f. subfimbriata, juncoides f. hirtella, juncoides var. nana, juncoides var. ampliceps, juncoides var. juncoides, juncoides var. lorentzii, loefgrenii, paradoxa, rugosa, scabra, sellowiana, 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, bicolor, 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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