| Betula spp. | | a | |
| Betula alba L. | Betula pubescens Ehrh. | | |
| Betula alba L. subsp. mandshurica Regel | Betula platyphylla Sukaczev | | i |
| Betula alba L. var. cordifolia (Regel) Regel | Betula cordifolia Regel | | i |
| Betula alba L. var. japonica Miq. | Betula platyphylla Sukaczev | | i |
| Betula alba L. var. schugnanica B. Fedtsch. | Betula schugnanica (B. Fedtsch.) Litv. | | i |
| Betula albosinensis Burkill | | a | |
| Betula albosinensis Burkill var. septentrionalis C. K. Schneid. | Betula utilis D. Don var. utilis | | i |
| Betula alleghaniensis Britton | | a | |
| Betula alnobetula Ehrh. | Alnus viridis (Chaix) DC. subsp. viridis | | |
| Betula alnoides Buch.-Ham. ex D. Don | | a | |
| Betula alnus L. | Alnus glutinosa (L.) Gaertn. | | |
| Betula alnus L. var. glutinosa L. | Alnus glutinosa (L.) Gaertn. | | i |
| Betula alnus L. var. incana L. | Alnus incana (L.) Moench subsp. incana | | i |
| Betula alnus L. var. rugosa Du Roi | Alnus incana (L.) Moench subsp. rugosa (Du Roi) R. T. Clausen | | i |
| Betula alpestris Fr. var. sukaczewii (Soczava) Govaerts | | a | i |
| Betula apoiensis Nakai | | a | |
| Betula arguta Schltdl. | Alnus acuminata Kunth subsp. arguta (Schltdl.) Furlow | | |
| Betula atrata Domin | Betula aurata Borkh. | | |
| Betula aurata Borkh. | | a | |
| Betula bhojpattra Lindl. ex Wall. | Betula utilis D. Don var. utilis | | |
| Betula chinensis Maxim. | | a | |
| Betula cordata Loisel. | Alnus cordata (Loisel.) Duby | | |
| Betula cordifolia Regel | | a | |
| Betula corylifolia Regel & Maxim. | | a | |
| Betula costata Trautv. | | a | |
| Betula crispa Aiton | Alnus viridis (Chaix) DC. subsp. crispa (Aiton) Turrill | | |
| Betula cylindrostachya Lindl. ex Wall. | | a | |
| Betula czerepanovii N. I. Orlova | Betula pubescens Ehrh. subsp. tortuosa (Ledeb.) Nyman | | |
| Betula davurica Pall. | | a | |
| Betula divaricata Ledeb. | | a | |
| Betula ermanii Cham. | | a | |
| Betula ermanii Cham. var. communis Koidz. | Betula ermanii Cham. var. ermanii | | i |
| Betula ermanii Cham. var. ermanii | | a | i |
| Betula ermanii Cham. var. ganjuensis (Koidz.) Nakai | Betula ermanii Cham. var. ermanii | | i |
| Betula ermanii Cham. var. lanata Regel | Betula lanata (Regel) Vassilcz. | | i |
| Betula ermanii Cham. var. nipponica Maxim. | Betula ermanii Cham. var. ermanii | | i |
| Betula ermanii Cham. var. subcordata (Regel) Koidz. | Betula ermanii Cham. var. ermanii | | i |
| Betula excelsa Aiton | Betula papyrifera Marshall | | |
| Betula exilis Sukaczev | Betula nana L. subsp. exilis (Sukaczev) Hulten | | |
| Betula extremiorientalis Kuzen. & V. N. Vassil. | Betula ovalifolia Rupr. | | |
| Betula fontinalis Sarg. | Betula occidentalis Hook. | | |
| Betula forrestii (W. W. Sm.) Hand.-Mazz. | | a | |
| Betula fruticans Pall., orth. var. | Betula humilis Schrank | | i |
| Betula fruticosa Pall. | | a | |
| Betula fruticosa Pall. subsp. fusca (Pall. ex Georgi) Shemberg | | a | i |
| Betula fusca Pall. ex Georgi | Betula fruticosa Pall. subsp. fusca (Pall. ex Georgi) Shemberg | | |
| Betula ganjuensis Koidz. | Betula ermanii Cham. var. ermanii | | |
| Betula glandulosa Michx. | | a | |
| Betula globispica Shirai | | a | |
| Betula glutinosa (L.) Lam. | Alnus glutinosa (L.) Gaertn. | | |
| Betula gmelinii Bunge | | a | |
| Betula grossa Siebold & Zucc. | | a | |
| Betula hallii Howell | Betula pumila L. | | |
| Betula humilis Schrank | | a | |
| Betula insignis Franch. | | a | |
| Betula jacquemontii Spach | Betula utilis D. Don var. jacquemontii (Spach) H. J. P. Winkl. | | |
| Betula japonica Siebold ex H. J. P. Winkl. var. kamtschatica (Regel) H. J. P. Winkl. | Betula platyphylla Sukaczev | | i |
| Betula japonica Siebold ex H. J. P. Winkl. var. mandshurica (Regel) H. J. P. Winkl. | Betula platyphylla Sukaczev | | i |
| Betula japonica Siebold ex H. J. P. Winkl. var. szechuanica C. K. Schneid. | Betula platyphylla Sukaczev | | i |
| Betula japonica Siebold ex H. J. P. Winkl., nom. nud. | Betula platyphylla Sukaczev | | |
| Betula kenaica W. H. Evans | | a | |
| Betula kirghisorum Sav.-Rycz. | | a | |
| Betula koehnei C. K. Schneid. | | a | |
| Betula lanata (Regel) Vassilcz. | | a | |
| Betula lenta L. | | a | |
| Betula litwinowii Doluch. | | a | |
| Betula luminifera H. J. P. Winkl. | | a | |
| Betula lutea auct. | Betula alleghaniensis Britton | | |
| Betula lyalliana Koehne, nom. nud. | Betula papyrifera Marshall | | |
| Betula mandshurica (Regel) Nakai | Betula platyphylla Sukaczev | | |
| Betula mandshurica (Regel) Nakai var. japonica (Miq.) Rehder | Betula platyphylla Sukaczev | | i |
| Betula mandshurica (Regel) Nakai var. mandshurica | Betula platyphylla Sukaczev | | i |
| Betula mandshurica (Regel) Nakai var. szechuanica (C. K. Schneid.) Rehder | Betula platyphylla Sukaczev | | i |
| Betula maximowicziana Regel | | a | |
| Betula medwediewii Regel | | a | |
| Betula megrelica Sosn. | | a | |
| Betula michauxii Spach | | a | |
| Betula middendorffii Trautv. & C. A. Mey. | Betula divaricata Ledeb. | | |
| Betula murrayana B. V. Barnes & Dancik | | a | |
| Betula nana L. | | a | |
| Betula nana L. subsp. exilis (Sukaczev) Hulten | | a | i |
| Betula nana L. subsp. nana | | a | i |
| Betula neoalaskana Sarg. | | a | |
| Betula nigra L. | | a | |
| Betula obscura Kotula | Betula aurata Borkh. | | |
| Betula occidentalis Hook. | | a | |
| Betula ovalifolia Rupr. | | a | |
| Betula paishanensis Nakai | Betula ovalifolia Rupr. | | |
| Betula papyrifera Marshall | | a | |
| Betula papyrifera Marshall var. commutata (Regel) Fernald | Betula papyrifera Marshall | | i |
| Betula papyrifera Marshall var. cordifolia (Regel) Fernald | Betula cordifolia Regel | | i |
| Betula papyrifera Marshall var. kenaica (W. H. Evans) A. Henry | Betula kenaica W. H. Evans | | i |
| Betula papyrifera Marshall var. neoalaskana (Sarg.) Raup | Betula neoalaskana Sarg. | | i |
| Betula papyrifera Marshall var. occidentalis (Hook.) Sarg. | Betula occidentalis Hook. | | i |
| Betula paraermanii V. N. Vassil. | Betula ermanii Cham. var. ermanii | | |
| Betula pendula Roth | | a | |
| Betula pendula Roth f. dalecarlica (L. f.) C. K. Schneid. | Betula pendula Roth | | i |
| Betula pendula Roth f. purpurea (Andre) C. K. Schneid. | Betula pendula Roth | | i |
| Betula pendula Roth var. oycoviensis (Besser) Dippel | | a | i |
| Betula platyphylla Sukaczev | | a | |
| Betula platyphylla Sukaczev var. japonica (Miq.) H. Hara | Betula platyphylla Sukaczev | | i |
| Betula platyphylla Sukaczev var. kamtschatica (Regel) H. Hara | Betula platyphylla Sukaczev | | i |
| Betula platyphylla Sukaczev var. mandshurica (Regel) H. Hara | Betula platyphylla Sukaczev | | i |
| Betula platyphylla Sukaczev var. szechuanica (C. K. Schneid.) Rehder | Betula platyphylla Sukaczev | | i |
| Betula plettkei Junge | | a | |
| Betula populifolia Marshall | | a | |
| Betula populifolia Marshall f. purpurea (Ellw. & P. Barry) C. K. Schneid. | Betula populifolia Marshall | | i |
| Betula potaninii Batalin | | a | |
| Betula procurva Litv. | | a | |
| Betula procurva Litv. subsp. schugnanica (B. Fedtsch.) Ovcz. | Betula schugnanica (B. Fedtsch.) Litv. | | i |
| Betula pubescens Ehrh. | | a | |
| Betula pubescens Ehrh. subsp. czerepanovii (N. I. Orlova) Hamet-Ahti | Betula pubescens Ehrh. subsp. tortuosa (Ledeb.) Nyman | | i |
| Betula pubescens Ehrh. subsp. tortuosa (Ledeb.) Nyman | | a | i |
| Betula pumila L. | | a | |
| Betula pumila L. var. fastigiata hort. ex Rehder | Betula pumila L. | | i |
| Betula pumila L. var. glandulifera Regel | | a | i |
| Betula purpusii C. K. Schneid. | | a | |
| Betula raddeana Trautv. | | a | |
| Betula raymundii Lepage | | a | |
| Betula resinifera Britton | Betula neoalaskana Sarg. | | |
| Betula rugosa (Du Roi) Ehrh. | Alnus incana (L.) Moench subsp. rugosa (Du Roi) R. T. Clausen | | |
| Betula sandbergii Britton | | a | |
| Betula saposhnikovii Sukaczev | | a | |
| Betula schmidtii Regel | | a | |
| Betula schugnanica (B. Fedtsch.) Litv. | | a | |
| Betula shikokiana Nakai | Betula ermanii Cham. var. ermanii | | |
| Betula sukaczewii Soczava | Betula alpestris Fr. var. sukaczewii (Soczava) Govaerts | | |
| Betula szechuanica (C. K. Schneid.) C.-A. Jansson | Betula platyphylla Sukaczev | | |
| Betula tatewakiana M. Ohki & S. Watan. | Betula ovalifolia Rupr. | | |
| Betula tianschanica Rupr. | | a | |
| Betula tortuosa Ledeb. | Betula pubescens Ehrh. subsp. tortuosa (Ledeb.) Nyman | | |
| Betula tristis Wormsk. ex Link | | a | |
| Betula turkestanica Litv. | | a | |
| Betula uber (Ashe) Fernald | | a | |
| Betula ulmifolia Siebold & Zucc. | Betula grossa Siebold & Zucc. | | |
| Betula utilis D. Don | | a | |
| Betula utilis D. Don var. jacquemontii (Spach) H. J. P. Winkl. | | a | i |
| Betula utilis D. Don var. utilis | | a | i |
| Betula verrucosa Ehrh. | Betula pendula Roth | | |
| Betula viridis Chaix | Alnus viridis (Chaix) DC. subsp. viridis | | |