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[[File:Begonia boliviensis (1).jpg|250px|right|thumb|''[[Begonia boliviensis]]'']]
{{Colunas-lista|3|
*''[[Begonia baccata]]'' <small> Hook.f. </small>
*''[[Begonia bagotiana]]'' <small> [[Jean-Henri Humbert|Humbert]] ex Aymonin & Bosser </small>
*''[[Begonia bahakensis]]'' <small> Sands </small>
*''[[Begonia bahiensis]]'' <small> A.DC. </small>
*''[[Begonia balansae]]'' <small> C.DC. </small>
*''[[Begonia balansana]]'' <small> Gagnep. </small>
*''[[Begonia baliensis]]'' <small> Girm. </small>
*''[[Begonia balmisiana]]'' <small> Balmis </small>
*''[[Begonia bamaensis]]'' <small> Yan Liu & C.I Peng </small>
*''[[Begonia banaoensis]]'' <small> J.Sierra </small>
*''[[Begonia bangii]]'' <small> Kuntze </small>
*''[[Begonia baramensis]]'' <small>[[Elmer Drew Merrill|Merr.]]</small>
*''[[Begonia barbellata]]barbellat'' <small> Ridl. </small>
*''[[Begonia barborkae]]'' <small> Halda </small>
*''[[Begonia barkeri]]'' <small> Knowles & Westc. </small>
*''[[Begonia barkleyana]]'' <small> L.B.Sm. </small>
*''[[Begonia baronii]]'' <small> Baker </small>
*''[[Begonia barrigae]]'' <small> L.B.Sm. & B.G.Schub. </small>
*''[[Begonia bartlettiana]]'' <small> Merr. & L.M.Perry </small>
*''[[Begonia bataiensis]]'' <small> Kiew </small>
*''[[Begonia baturongensis]]'' <small> Kiew </small>
*''[[Begonia baumannii]]'' <small> Lemoine ex Wittm. </small>
*''[[Begonia baviensis]]'' <small> Gagnep. </small>
*''[[Begonia beccariana]]'' <small> Ridl. </small>
*''[[Begonia beccarii]]'' <small> [[Otto Warburg|Warb.]]</small>
*''[[Begonia beddomei]]'' <small> Hook.f. </small>
*''[[Begonia bekopakensis]]'' <small> Aymonin & Bosser </small>
*''[[Begonia bequaertii]]'' <small> Robyns & Lawalrée </small>
*''[[Begonia berhamanii]]'' <small> Kiew </small>
*''[[Begonia bernicei]]'' <small> Aymard & G.A.Romero </small>
*''[[Begonia bernieri]]'' <small> A.DC. </small>
*''[[Begonia beryllae]]'' <small> Ridl. </small>
*''[[Begonia besleriifolia]]'' <small> Schott </small>
*''[[Begonia betsimisaraka]]'' <small> Humbert </small>
*''[[Begonia bettinae]]'' <small> Ziesenh. </small>
*''[[Begonia bidentata]]'' <small>[[Giuseppe Raddi|Raddi]]</small>
*''[[Begonia biflora]]'' <small> T.C.Ku </small>
*''[[Begonia bifolia]]'' <small> Ridl. </small>
*''[[Begonia bifurcata]]'' <small> L.B.Sm. & B.G.Schub. </small>
*''[[Begonia biguassuensis]]'' <small> [[Alexander Curt Brade|Brade]]</small>
*''[[Begonia biliranensis]]'' <small> Merr. </small>
*''[[Begonia binuangensis]]'' <small> Merr. </small>
*''[[Begonia bipinnatifida]]'' <small> J.J.Sm. </small>
*''[[Begonia biserrata]]'' <small> Lindl. </small>
*''[[Begonia bissei]]'' <small> J.Sierra </small>
*''[[Begonia blancii]]'' <small> M.Hughes & C.I Peng </small>
*''[[Begonia bogneri]]'' <small> Ziesenh. </small>
*''[[Begonia boisiana]]'' <small> Gagnep. </small>
*''[[Begonia boissieri]]'' <small> A.DC. </small>
*''[[Begonia boiviniana]]'' <small> A.DC. </small>
*''[[Begonia boliviensis]]'' <small> A.DC. </small>
*''[[Begonia bolleana]]'' <small> Urb. & Ekman </small>
*''[[Begonia bolsteri]]'' <small> Merr. </small>
*''[[Begonia bonii]]'' <small> Gagnep. </small>
*''[[Begonia bonitoensis]]'' <small> Brade </small>
*''[[Begonia bonthainensis]]'' <small> Hemsl. </small>
*''[[Begonia bonus-henricus]]'' <small> J.J.de Wilde </small>
*''[[Begonia boraceiensis]]'' <small> Handro </small>
*''[[Begonia borneensis]]'' <small> A.DC. </small>
*''[[Begonia bosseri]]'' <small> Keraudren </small>
*''[[Begonia boucheana]]'' <small> (Klotzsch) A.DC. </small>
*''[[Begonia bouffordii]]'' <small> C.I Peng </small>
*''[[Begonia bowerae]]'' <small> Ziesenh. </small>
*''[[Begonia brachybotrys]]'' <small> Merr. & L.M.Perry </small>
*''[[Begonia brachyclada]]'' <small> Urb. & Ekman </small>
*''[[Begonia brachypoda]]'' <small> O.E.Schulz </small>
*''[[Begonia bracteata]]'' <small> Jack </small>
*''[[Begonia bracteosa]]'' <small> A.DC. </small>
*''[[Begonia bradei]]'' <small> Irmsch. </small>
*''[[Begonia brandbygeana]]'' <small> L.B.Sm. & Wassh. </small>
*''[[Begonia brandisiana]]'' <small> Kurz </small>
*''[[Begonia brassii]]'' <small> Merr. & L.M.Perry </small>
*''[[Begonia breedlovei]]'' <small> Burt-Utley </small>
*''[[Begonia brevibracteata]]'' <small> Kupicha </small>
*''[[Begonia brevicaulis]]'' <small> A.DC. </small>
*''[[Begonia brevicordata]]'' <small> L.B.Sm. & B.G.Schub. </small>
*''[[Begonia brevilobata]]'' <small> Irmsch. </small>
*''[[Begonia brevipedunculata]]'' <small> Y.M.Shui </small>
*''[[Begonia brevipes]]'' <small> Merr. </small>
*''[[Begonia brevipetala]]'' <small> (A.DC.) Warb. </small>
*''[[Begonia brevirimosa]]'' <small> Irmsch. </small>
*''[[Begonia brevisetulosa]]'' <small> C.Y.Wu </small>
*''[[Begonia bridgesii]]'' <small> A.DC. </small>
*''[[Begonia bruneiana]]'' <small> Sands </small>
*''[[Begonia buchtienii]]'' <small> Irmsch. </small>
*''[[Begonia buddleiifolia]]'' <small> A.DC. </small>
*''[[Begonia bufoderma]]'' <small> L.B.Sm. & Wassh. </small>
*''[[Begonia buimontana]]'' <small> Yamam. </small>
*''[[Begonia bulbillifera]]'' <small> Link & Otto </small>
*''[[Begonia bullata]]'' <small> Urb. & Ekman </small>
*''[[Begonia bullatifolia]]'' <small> L.Kollmann </small>
*''[[Begonia burbidgei]]'' <small> Stapf </small>
*''[[Begonia burkillii]]'' <small> [[Stephen Troyte Dunn|Dunn]]</small>
*''[[Begonia burmensis]]'' <small> L.B.Sm. & Wassh. </small>
*''[[Begonia burttii]]'' <small> Kiew & S.Julia </small>
*''[[Begonia buseyi]]'' <small> Burt-Utley </small>
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