• Betula Ashmead, 1902 accepted as Betyla Cameron, 1889 [Family: Diapriidae]
• Betula Linnaeus, 1753 [Family: Betulaceae]
• Betula abolinii Sukaczev accepted as Betula nana Linnaeus
• Betula acuminata Ehrh. accepted as Betula populifolia Marshall
• Betula acuminata Kindb.
• Betula acuminata Wall. accepted as Betula alnoides Buch.-Ham. ex D. Don
• Betula acuminatifolia V.N. Vassil. accepted as Betula grossa Siebold & Zucc.
• Betula adasii T.V. Egorova & Sipliv.
• Betula aetnensis Raf. accepted as Betula pendula Roth
• Betula affinis (Spach) Endl. accepted as Betula alnoides Buch.-Ham. ex D. Don
• Betula aischatiae E.S. Husseinov accepted as Betula raddeana Trautv.
• Betula ajanensis Kom. accepted as Betula platyphylla Sukaczev
• Betula alajica Litv.
• Betula alaskana Sarg. accepted as Betula neoalaskana Sarg.
• Betula alatavica Musch. accepted as Betula tianschanica Rupr.
• Betula alba Linnaeus accepted as Betula pubescens Ehrh.
• Betula albosinensis Burkill
• Betula alleghaniensis Britton
• Betula alnobetula Ehrh. accepted as Alnus viridis (Chaix) DC.
• Betula alnoides Buch.-Ham. ex D. Don
• Betula alnus Linnaeus accepted as Alnus incana (L.) Moench
• Betula alnus-crispa Steud. accepted as Alnus viridis (Chaix) DC.
• Betula alpestris Fr.
• Betula alpina Borkh. ex Theorin accepted as Alnus viridis (Chaix) DC.
• Betula alpina Kindb. accepted as Betula alpestris Fr.
• Betula ambigua Hampe ex Rchb. accepted as Betula pubescens Ehrh.
• Betula americana Buc'hoz accepted as Betula nigra Linnaeus
• Betula andreji V.N. Vassil. accepted as Betula pubescens Ehrh.
• Betula andrewsii A. Nelson accepted as Betula utahensis Britton
• Betula angulata Steud.
• Betula antarctica G. Forst. accepted as Nothofagus betuloides (Mirb.) Oerst.
• Betula apoiensis Nakai
• Betula arbuscula Dugle accepted as Betula eastwoodiae Sarg.
• Betula arguta Schltdl. accepted as Alnus acuminata Kunth
• Betula aschersoniana Hayek
• Betula asplenifolia Regel accepted as Betula pubescens Ehrh.
• Betula atrata Domin accepted as Betula aurata Borkh.
• Betula aurata Borkh.
• Betula aurea Steud. accepted as Betula pubescens Ehrh.
• Betula austrosichotensis V.N. Vassil. & V.I. Baranov
• Betula austrosinensis Chun
• Betula avatshensis Kom.
• Betula baeumkeri H. Winkl. accepted as Betula luminifera H. Winkl.
• Betula baicalensis Sukaczev
• Betula baicalia V.N. Vassil. accepted as Betula pubescens Ehrh.
• Betula baranovii Sukaczev accepted as Betula microphylla Bunge
• Betula barguzinensis Popov accepted as Betula divaricata Ledeb.
• Betula beeniana A. Nelson accepted as Betula occidentalis Hook.
• Betula bhojpattra Koehne accepted as Betula utilis D. Don
• Betula bhojpattra Lindl. ex Wall. accepted as Betula utilis D. Don
• Betula bomiensis P.C. Li
• Betula borealis Spach accepted as Betula pumila Linnaeus
• Betula borggreveana Zabel ex H. Winkl.
• Betula bornmuelleri V.N. Vassil. accepted as Betula seravschanica V.N. Vassil.
• Betula borysthenica Klokov accepted as Betula pubescens Ehrh.
• Betula bottnica Mela accepted as Betula fennica Dörfl.
• Betula brachylepis V.N. Vassil. accepted as Betula pendula Roth
• Betula broccembergensis Bechst. accepted as Betula pubescens Ehrh.
• Betula bucharica V.N. Vassil. accepted as Betula pamirica Litv.
• Betula caerulea Blanch.
• Betula caerulea-grandis Blanch. accepted as Betula caerulea Blanch.
• Betula cajanderi Sukaczev accepted as Betula pendula Roth
• Betula calcicola (W.W. Sm.) P.C. Li
• Betula callosa Notø accepted as Betula pubescens Ehrh.
• Betula canadensis K. Koch accepted as Betula pubescens Ehrh.
• Betula candelae Koidz. accepted as Betula maximowicziana Regel
• Betula carpatica Waldst. & Kit. ex Willd. accepted as Betula pubescens Ehrh.
• Betula carpinifolia Ehrh. accepted as Betula lenta Linnaeus
• Betula carpinifolia Siebold & Zucc. accepted as Betula grossa Siebold & Zucc.
• Betula castanae Buch.-Ham. ex Hook. f. accepted as Betula utilis D. Don
• Betula caucasica Litv. ex Leskov accepted as Betula litwinowii Doluch.
• Betula celtiberica Rothm. & Vasc. accepted as Betula pubescens Ehrh.
• Betula ceratoptera G.H. Liu & Y.C. Ma
• Betula chichibuensis Hara
• Betula chinensis Maxim.
• Betula chitralica Browicz
• Betula ciliata Steud.
• Betula collina Nakai
• Betula commixta Sarg. accepted as Betula utahensis Britton
• Betula concinna Gunnarsson accepted as Betula pubescens Ehrh.
• Betula cordata Loisel. accepted as Alnus cordata (Loisel.) Loisel.
• Betula cordifolia Regel accepted as Betula papyrifera Marshall
• Betula coriacea Gunnarsson accepted as Betula pubescens Ehrh.
• Betula coriacea Pamp.
• Betula coriaceifolia V.N. Vassil.
• Betula coriifolia Tausch ex Regel accepted as Betula pubescens Ehrh.
• Betula corylifolia Griff.
• Betula corylifolia Regel & Maxim.
• Betula costata Trautv.
• Betula crassijulis Musch. accepted as Betula tianschanica Rupr.
• Betula crenata Rydb. ex E.J. Butler accepted as Betula nana Linnaeus
• Betula crispa Aiton accepted as Alnus viridis (Chaix) DC.
• Betula cryptocarpa Laest. accepted as Betula pubescens Ehrh.
• Betula cuspidata Schrad. ex Regel accepted as Betula populifolia Marshall
• Betula cyclophylla Nakai
• Betula cycoviensis Steud. accepted as Betula pendula Roth
• Betula cylindrostachya Lindl. ex Wall.
• Betula czatkalensis V.N. Vassil. accepted as Betula microphylla Bunge
• Betula czerepanovii N.I. Orlova accepted as Betula pubescens Ehrh.
• Betula dahurica Pall.