| Betula alba L. | Betula pubescens Ehrh. var. pubescens | | | Betula alba L. | Betula pubescens Ehrh. var.pubescens | 7065 | 474583 |
| Betula alba L. var. japonica Miq. | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | i | Betula alba L. var.japonica Miq. | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 7066 | 476252 |
| Betula albosinensis Burkill | Betula utilis D. Don subsp. albosinensis (Burkill) Ashburner & McAll. | | | Betula albosinensis Burkill | Betula utilis D. Don subsp. albosinensis (Burkill) Ashburner & McAll. | 7067 | 476247 |
| Betula alleghaniensis Britton | | a | | Betula alleghaniensis Britton | | 7068 | |
| Betula alnoides Buch.-Ham. ex D. Don | | a | | Betula alnoides Buch.-Ham. ex D. Don | | 7069 | |
| Betula bhojpattra Lindl. ex Wall. | Betula utilis D. Don subsp. utilis | | | Betula bhojpattra Lindl. ex Wall. | Betula utilis D. Don subsp. utilis | 7074 | 411505 |
| Betula chinensis Maxim. | | a | | Betula chinensis Maxim. | | 7075 | |
| Betula corylifolia Regel & Maxim. | | a | | Betula corylifolia Regel & Maxim. | | 7076 | |
| Betula costata Trautv. | | a | | Betula costata Trautv. | | 7077 | |
| Betula cylindrostachya Lindl. ex Wall. | | a | | Betula cylindrostachya Lindl. ex Wall. | | 7078 | |
| Betula davurica Pall. | | a | | Betula davurica Pall. | | 7079 | |
| Betula ermanii Cham. | | a | | Betula ermanii Cham. | | 7080 | |
| Betula ermanii Cham. var. communis Koidz. | Betula ermanii Cham. var. ermanii | | i | Betula ermanii Cham. var.communis Koidz. | Betula ermanii Cham. var.ermanii | 7081 | 411507 |
| Betula ermanii Cham. var. ganjuensis (Koidz.) Nakai | Betula ermanii Cham. var. ermanii | | i | Betula ermanii Cham. var.ganjuensis (Koidz.) Nakai | Betula ermanii Cham. var.ermanii | 7082 | 411507 |
| Betula ermanii Cham. var. nipponica Maxim. | Betula ermanii Cham. var. ermanii | | i | Betula ermanii Cham. var.nipponica Maxim. | Betula ermanii Cham. var.ermanii | 7083 | 411507 |
| Betula ermanii Cham. var. subcordata (Regel) Koidz. | Betula ermanii Cham. var. ermanii | | i | Betula ermanii Cham. var.subcordata (Regel) Koidz. | Betula ermanii Cham. var.ermanii | 7084 | 411507 |
| Betula excelsa Aiton | Betula papyrifera Marshall | | | Betula excelsa Aiton | Betula papyrifera Marshall | 7085 | 7122 |
| Betula exilis Sukaczev | Betula glandulosa Michx. | | | Betula exilis Sukaczev | Betula glandulosa Michx. | 7086 | 7092 |
| Betula extremiorientalis Kuzen. & V. N. Vassil. | Betula humilis Schrank | | | Betula extremiorientalis Kuzen. & V. N. Vassil. | Betula humilis Schrank | 7087 | 7096 |
| Betula forrestii (W. W. Sm.) Hand.-Mazz. | Betula delavayi Franch. | | | Betula forrestii (W. W. Sm.) Hand.-Mazz. | Betula delavayi Franch. | 7088 | 476239 |
| Betula fruticans Pall., orth. var. | Betula fruticosa Pall. | | | Betula fruticans Pall., orth. var. | Betula fruticosa Pall. | 7089 | 7090 |
| Betula fruticosa Pall. | | a | | Betula fruticosa Pall. | | 7090 | |
| Betula ganjuensis Koidz. | Betula ermanii Cham. var. ermanii | | | Betula ganjuensis Koidz. | Betula ermanii Cham. var.ermanii | 7091 | 411507 |
| Betula glandulosa Michx. | | a | | Betula glandulosa Michx. | | 7092 | |
| Betula globispica Shirai | | a | | Betula globispica Shirai | | 7093 | |
| Betula grossa Siebold & Zucc. | | a | | Betula grossa Siebold & Zucc. | | 7094 | |
| Betula hallii Howell | Betula pumila L. | | | Betula hallii Howell | Betula pumila L. | 7095 | 7140 |
| Betula humilis Schrank | | a | | Betula humilis Schrank | | 7096 | |
| Betula jacquemontii Spach | Betula utilis D. Don subsp. jacquemontii (Spach) Ashburner & McAll. | | | Betula jacquemontii Spach | Betula utilis D. Don subsp. jacquemontii (Spach) Ashburner & McAll. | 7097 | 476246 |
| Betula japonica Siebold ex H. J. P. Winkl., nom. nud. | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | | Betula japonica Siebold ex H. J. P. Winkl., nom. nud. | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 7098 | 476252 |
| Betula japonica Siebold ex H. J. P. Winkl. var. kamtschatica (Regel) H. J. P. Winkl. | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | i | Betula japonica Siebold ex H. J. P. Winkl. var.kamtschatica (Regel) H. J. P. Winkl. | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 7099 | 476252 |
| Betula japonica Siebold ex H. J. P. Winkl. var. mandshurica (Regel) H. J. P. Winkl. | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | i | Betula japonica Siebold ex H. J. P. Winkl. var.mandshurica (Regel) H. J. P. Winkl. | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 7100 | 476252 |
| Betula japonica Siebold ex H. J. P. Winkl. var. szechuanica C. K. Schneid. | Betula pendula Roth subsp. szechuanica (C. K. Schneid.) Ashburner & McAll. | | i | Betula japonica Siebold ex H. J. P. Winkl. var.szechuanica C. K. Schneid. | Betula pendula Roth subsp. szechuanica (C. K. Schneid.) Ashburner & McAll. | 7101 | 476253 |
| Betula kenaica W. H. Evans | | a | | Betula kenaica W. H. Evans | | 7102 | |
| Betula kirghisorum Sav.-Rycz. | | a | | Betula kirghisorum Sav.-Rycz. | | 7103 | |
| Betula ×koehnei C. K. Schneid. | | a | | Betula koehnei C. K. Schneid. | | 7104 | |
| Betula lenta L. | | a | | Betula lenta L. | | 7107 | |
| Betula luminifera H. J. P. Winkl. | | a | | Betula luminifera H. J. P. Winkl. | | 7108 | |
| Betula lutea auct. | Betula alleghaniensis Britton | | | Betula lutea auct. | Betula alleghaniensis Britton | 7109 | 7068 |
| Betula lyalliana Koehne, nom. nud. | Betula papyrifera Marshall | | | Betula lyalliana Koehne, nom. nud. | Betula papyrifera Marshall | 7110 | 7122 |
| Betula mandshurica (Regel) Nakai | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | | Betula mandshurica (Regel) Nakai | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 7111 | 476252 |
| Betula mandshurica (Regel) Nakai var. japonica (Miq.) Rehder | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | i | Betula mandshurica (Regel) Nakai var.japonica (Miq.) Rehder | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 7112 | 476252 |
| Betula mandshurica (Regel) Nakai var. szechuanica (C. K. Schneid.) Rehder | Betula pendula Roth subsp. szechuanica (C. K. Schneid.) Ashburner & McAll. | | i | Betula mandshurica (Regel) Nakai var.szechuanica (C. K. Schneid.) Rehder | Betula pendula Roth subsp. szechuanica (C. K. Schneid.) Ashburner & McAll. | 7113 | 476253 |
| Betula maximowicziana Regel | | a | | Betula maximowicziana Regel | | 7114 | |
| Betula michauxii Spach | | a | | Betula michauxii Spach | | 7115 | |
| Betula middendorffii Trautv. & C. A. Mey. | Betula fruticosa Pall. | | | Betula middendorffii Trautv. & C. A. Mey. | Betula fruticosa Pall. | 7116 | 7090 |
| Betula nana L. | | a | | Betula nana L. | | 7117 | |
| Betula nigra L. | | a | | Betula nigra L. | | 7118 | |
| Betula occidentalis Hook. | | a | | Betula occidentalis Hook. | | 7119 | |
| Betula ovalifolia Rupr. | Betula fruticosa Pall. | | | Betula ovalifolia Rupr. | Betula fruticosa Pall. | 7120 | 7090 |
| Betula papyrifera Marshall | | a | | Betula papyrifera Marshall | | 7122 | |
| Betula papyrifera Marshall var. commutata (Regel) Fernald | Betula papyrifera Marshall | | i | Betula papyrifera Marshall var.commutata (Regel) Fernald | Betula papyrifera Marshall | 7123 | 7122 |
| Betula papyrifera Marshall var. kenaica (W. H. Evans) A. Henry | Betula kenaica W. H. Evans | | i | Betula papyrifera Marshall var.kenaica (W. H. Evans) A. Henry | Betula kenaica W. H. Evans | 7124 | 7102 |
| Betula papyrifera Marshall var. occidentalis (Hook.) Sarg. | Betula occidentalis Hook. | | i | Betula papyrifera Marshall var.occidentalis (Hook.) Sarg. | Betula occidentalis Hook. | 7125 | 7119 |
| Betula paraermanii V. N. Vassil. | Betula ermanii Cham. var. ermanii | | | Betula paraermanii V. N. Vassil. | Betula ermanii Cham. var.ermanii | 7126 | 411507 |
| Betula pendula Roth | | a | | Betula pendula Roth | | 7127 | |
| Betula pendula Roth f. dalecarlica (L. f.) C. K. Schneid. | Betula pendula Roth subsp. pendula | | i | Betula pendula Roth f. dalecarlica (L. f.) C. K. Schneid. | Betula pendula Roth subsp. pendula | 7128 | 476251 |
| Betula pendula Roth f. purpurea (André) C. K. Schneid. | Betula pendula Roth | | i | Betula pendula Roth f. purpurea (André) C. K. Schneid. | Betula pendula Roth | 7129 | 7127 |
| Betula platyphylla Sukaczev | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | | Betula platyphylla Sukaczev | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 7130 | 476252 |
| Betula platyphylla Sukaczev var. japonica (Miq.) H. Hara | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | i | Betula platyphylla Sukaczev var.japonica (Miq.) H. Hara | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 7131 | 476252 |
| Betula platyphylla Sukaczev var. kamtschatica (Regel) H. Hara | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | i | Betula platyphylla Sukaczev var.kamtschatica (Regel) H. Hara | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 7132 | 476252 |
| Betula populifolia Marshall | | a | | Betula populifolia Marshall | | 7134 | |
| Betula populifolia Marshall f. purpurea (Ellw. & P. Barry) C. K. Schneid. | Betula populifolia Marshall | | i | Betula populifolia Marshall f. purpurea (Ellw. & P. Barry) C. K. Schneid. | Betula populifolia Marshall | 7135 | 7134 |
| Betula potaninii Batalin | | a | | Betula potaninii Batalin | | 7136 | |
| Betula platyphylla Sukaczev var. szechuanica (C. K. Schneid.) Rehder | Betula pendula Roth subsp. szechuanica (C. K. Schneid.) Ashburner & McAll. | | i | Betula platyphylla Sukaczev var.szechuanica (C. K. Schneid.) Rehder | Betula pendula Roth subsp. szechuanica (C. K. Schneid.) Ashburner & McAll. | 7137 | 476253 |
| Betula procurva Litv. | | a | | Betula procurva Litv. | | 7138 | |
| Betula pubescens Ehrh. | | a | | Betula pubescens Ehrh. | | 7139 | |
| Betula pumila L. | | a | | Betula pumila L. | | 7140 | |
| Betula pumila L. var. fastigiata hort. ex Rehder | Betula pumila L. | | i | Betula pumila L. var.fastigiata hort. ex Rehder | Betula pumila L. | 7141 | 7140 |
| Betula ×purpusii C. K. Schneid. | | a | | Betula purpusii C. K. Schneid. | | 7142 | |
| Betula raddeana Trautv. | | a | | Betula raddeana Trautv. | | 7143 | |
| Betula ×raymundii Lepage | | a | | Betula raymundii Lepage | | 7144 | |
| Betula ×sandbergii Britton | | a | | Betula sandbergii Britton | | 7145 | |
| Betula saposhnikovii Sukaczev | | a | | Betula saposhnikovii Sukaczev | | 7146 | |
| Betula schmidtii Regel | | a | | Betula schmidtii Regel | | 7147 | |
| Betula shikokiana Nakai | Betula ermanii Cham. var. ermanii | | | Betula shikokiana Nakai | Betula ermanii Cham. var.ermanii | 7149 | 411507 |
| Betula tatewakiana M. Ohki & S. Watan. | Betula fruticosa Pall. | | | Betula tatewakiana M. Ohki & S. Watan. | Betula fruticosa Pall. | 7150 | 7090 |
| Betula tianschanica Rupr. | | a | | Betula tianschanica Rupr. | | 7151 | |
| Betula tristis Wormsk. ex Link | Betula spp. | | | Betula tristis Wormsk. ex Link | Betula spp. | 7153 | 310082 |
| Betula turkestanica Litv. | | a | | Betula turkestanica Litv. | | 7154 | |
| Betula ulmifolia Siebold & Zucc. | Betula grossa Siebold & Zucc. | | | Betula ulmifolia Siebold & Zucc. | Betula grossa Siebold & Zucc. | 7156 | 7094 |
| Betula utilis D. Don | | a | | Betula utilis D. Don | | 7157 | |
| Betula verrucosa Ehrh. | Betula pendula Roth subsp. pendula | | | Betula verrucosa Ehrh. | Betula pendula Roth subsp. pendula | 7158 | 476251 |
| Betula viridis Chaix | Alnus viridis (Chaix) DC. subsp. viridis | | | Betula viridis Chaix | Alnus viridis (Chaix) DC. subsp. viridis | 7159 | 409852 |
| Betula albosinensis Burkill var. septentrionalis C. K. Schneid. | Betula utilis D. Don subsp. albosinensis (Burkill) Ashburner & McAll. | | i | Betula albosinensis Burkill var.septentrionalis C. K. Schneid. | Betula utilis D. Don subsp. albosinensis (Burkill) Ashburner & McAll. | 7318 | 476247 |
| Betula medwediewii Regel | | a | | Betula medwediewii Regel | | 7319 | |
| Betula apoiensis Nakai | | a | | Betula apoiensis Nakai | | 70125 | |
| Betula fontinalis Sarg. | Betula occidentalis Hook. | | | Betula fontinalis Sarg. | Betula occidentalis Hook. | 100502 | 7119 |
| Betula insignis Franch. | Betula kweichowensis Hu | | | Betula insignis Franch. | Betula kweichowensis Hu | 104662 | 476601 |
| Betula alba L. subsp. mandshurica Regel | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | i | Betula alba L. subsp. mandshurica Regel | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 105121 | 476252 |
| Betula alnus L. var. incana L. | Alnus incana (L.) Moench subsp. incana | | i | Betula alnus L. var.incana L. | Alnus incana (L.) Moench subsp. incana | 105123 | 409850 |
| Betula ×obscura Kotula | Betula ×aurata Borkh. | | | Betula obscura Kotula | Betula aurata Borkh. | 105124 | 411516 |
| Betula ermanii Cham. var. lanata Regel | | a | i | Betula ermanii Cham. var.lanata Regel | | 105127 | |
| Betula pubescens Ehrh. subsp. tortuosa (Ledeb.) Nyman | Betula pubescens Ehrh. var. pumila (L.) Govaerts | | i | Betula pubescens Ehrh. subsp. tortuosa (Ledeb.) Nyman | Betula pubescens Ehrh. var.pumila (L.) Govaerts | 105143 | 476256 |
| Betula pendula Roth var. oycoviensis (Besser) Dippel | Betula pendula Roth subsp. pendula | | i | Betula pendula Roth var.oycoviensis (Besser) Dippel | Betula pendula Roth subsp. pendula | 105146 | 476251 |
| Betula procurva Litv. subsp. schugnanica (B. Fedtsch.) Ovcz. | Betula schugnanica (B. Fedtsch.) Litv. | | i | Betula procurva Litv. subsp. schugnanica (B. Fedtsch.) Ovcz. | Betula schugnanica (B. Fedtsch.) Litv. | 105147 | 411523 |
| Betula spp. | | a | | Betula spp. | | 310082 | |
| Betula alnus L. var. rugosa Du Roi | Alnus incana (L.) Moench subsp. rugosa (Du Roi) R. T. Clausen | | i | Betula alnus L. var.rugosa Du Roi | Alnus incana (L.) Moench subsp. rugosa (Du Roi) R. T. Clausen | 310119 | 404157 |
| Betula uber (Ashe) Fernald | | a | | Betula uber (Ashe) Fernald | | 315536 | |
| Betula gmelinii Bunge | Betula fusca Pall. ex Georgi | | | Betula gmelinii Bunge | Betula fusca Pall. ex Georgi | 315846 | 413679 |
| Betula paishanensis Nakai | Betula fruticosa Pall. | | | Betula paishanensis Nakai | Betula fruticosa Pall. | 315847 | 7090 |
| Betula murrayana B. V. Barnes & Dancik | | a | | Betula murrayana B. V. Barnes & Dancik | | 400561 | |
| Betula platyphylla Sukaczev var. mandshurica (Regel) H. Hara | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | i | Betula platyphylla Sukaczev var.mandshurica (Regel) H. Hara | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 403575 | 476252 |
| Betula ×sukaczewii Soczava | | a | | Betula sukaczewii Soczava | | 404792 | |
| Betula papyrifera Marshall var. neoalaskana (Sarg.) Raup | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | i | Betula papyrifera Marshall var.neoalaskana (Sarg.) Raup | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 405354 | 476252 |
| Betula neoalaskana Sarg. | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | | Betula neoalaskana Sarg. | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 405356 | 476252 |
| Betula pumila L. var. glandulifera Regel | Betula pumila L. | | i | Betula pumila L. var.glandulifera Regel | Betula pumila L. | 405357 | 7140 |
| Betula szechuanica (C. K. Schneid.) C.-A. Jansson | Betula pendula Roth subsp. szechuanica (C. K. Schneid.) Ashburner & McAll. | | | Betula szechuanica (C. K. Schneid.) C.-A. Jansson | Betula pendula Roth subsp. szechuanica (C. K. Schneid.) Ashburner & McAll. | 411503 | 476253 |
| Betula mandshurica (Regel) Nakai var. mandshurica | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | i | Betula mandshurica (Regel) Nakai var.mandshurica | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 411504 | 476252 |
| Betula utilis D. Don subsp. utilis | | a | i | Betula utilis D. Don subsp. utilis | | 411505 | |
| Betula utilis D. Don var. jacquemontii (Spach) H. J. P. Winkl. | Betula utilis D. Don subsp. jacquemontii (Spach) Ashburner & McAll. | | i | Betula utilis D. Don var.jacquemontii (Spach) H. J. P. Winkl. | Betula utilis D. Don subsp. jacquemontii (Spach) Ashburner & McAll. | 411506 | 476246 |
| Betula ermanii Cham. var. ermanii | | a | i | Betula ermanii Cham. var.ermanii | | 411507 | |
| Betula lanata (Regel) Vassilcz. | Betula ermanii Cham. var. lanata Regel | | | Betula lanata (Regel) Vassilcz. | Betula ermanii Cham. var.lanata Regel | 411508 | 105127 |
| Betula nana L. subsp. exilis (Sukaczev) Hultén | Betula glandulosa Michx. | | i | Betula nana L. subsp. exilis (Sukaczev) Hultén | Betula glandulosa Michx. | 411510 | 7092 |
| Betula divaricata Ledeb. | Betula fruticosa Pall. | | | Betula divaricata Ledeb. | Betula fruticosa Pall. | 411515 | 7090 |
| Betula ×aurata Borkh. | | a | | Betula aurata Borkh. | | 411516 | |
| Betula schugnanica (B. Fedtsch.) Litv. | | a | | Betula schugnanica (B. Fedtsch.) Litv. | | 411523 | |
| Betula alba L. var. schugnanica B. Fedtsch. | Betula schugnanica (B. Fedtsch.) Litv. | | i | Betula alba L. var.schugnanica B. Fedtsch. | Betula schugnanica (B. Fedtsch.) Litv. | 411526 | 411523 |
| Betula ×alpestris Fr. nothovar. sukaczewii (Soczava) Govaerts | Betula ×sukaczewii Soczava | | i | Betula alpestris Fr. nothovar. sukaczewii (Soczava) Govaerts | Betula sukaczewii Soczava | 411527 | 404792 |
| Betula fusca Pall. ex Georgi | | a | | Betula fusca Pall. ex Georgi | | 413679 | |
| Betula pubescens Ehrh. subsp. czerepanovii (N. I. Orlova) Hämet-Ahti | Betula pubescens Ehrh. var. pumila (L.) Govaerts | | i | Betula pubescens Ehrh. subsp. czerepanovii (N. I. Orlova) Hämet-Ahti | Betula pubescens Ehrh. var.pumila (L.) Govaerts | 414010 | 476256 |
| Betula czerepanovii N. I. Orlova | Betula pubescens Ehrh. var. pumila (L.) Govaerts | | | Betula czerepanovii N. I. Orlova | Betula pubescens Ehrh. var.pumila (L.) Govaerts | 414011 | 476256 |
| Betula glutinosa (L.) Lam. | Alnus glutinosa (L.) Gaertn. | | | Betula glutinosa (L.) Lam. | Alnus glutinosa (L.) Gaertn. | 414018 | 2448 |
| Betula alnus L. var. glutinosa L. | Alnus glutinosa (L.) Gaertn. | | i | Betula alnus L. var.glutinosa L. | Alnus glutinosa (L.) Gaertn. | 414019 | 2448 |
| Betula resinifera (Regel) Britton | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | | Betula resinifera (Regel) Britton | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 414020 | 476252 |
| Betula rugosa (Du Roi) Ehrh. | Alnus incana (L.) Moench subsp. rugosa (Du Roi) R. T. Clausen | | | Betula rugosa (Du Roi) Ehrh. | Alnus incana (L.) Moench subsp. rugosa (Du Roi) R. T. Clausen | 414021 | 404157 |
| Betula cordata Loisel. | Alnus cordata (Loisel.) Duby | | | Betula cordata Loisel. | Alnus cordata (Loisel.) Duby | 415687 | 2437 |
| Betula arguta Schltdl. | Alnus acuminata Kunth subsp. arguta (Schltdl.) Furlow | | | Betula arguta Schltdl. | Alnus acuminata Kunth subsp. arguta (Schltdl.) Furlow | 416071 | 401975 |
| Betula tortuosa Ledeb. | Betula pubescens Ehrh. var. pumila (L.) Govaerts | | | Betula tortuosa Ledeb. | Betula pubescens Ehrh. var.pumila (L.) Govaerts | 417485 | 476256 |
| Betula litwinowii Doluch. | Betula pubescens Ehrh. var. litwinowii (Doluch.) Ashburner & McAll. | | | Betula litwinowii Doluch. | Betula pubescens Ehrh. var.litwinowii (Doluch.) Ashburner & McAll. | 446501 | 476259 |
| Betula fruticosa Pall. subsp. fusca (Pall. ex Georgi) Shemberg | Betula fusca Pall. ex Georgi | | i | Betula fruticosa Pall. subsp. fusca (Pall. ex Georgi) Shemberg | Betula fusca Pall. ex Georgi | 452009 | 413679 |
| Betula crispa Aiton | Alnus viridis (Chaix) DC. subsp. crispa (Aiton) Turrill | | | Betula crispa Aiton | Alnus viridis (Chaix) DC. subsp. crispa (Aiton) Turrill | 455763 | 411499 |
| Betula megrelica Sosn. | | a | | Betula megrelica Sosn. | | 455764 | |
| Betula alnus L. | Alnus glutinosa (L.) Gaertn. | | | Betula alnus L. | Alnus glutinosa (L.) Gaertn. | 457284 | 2448 |
| Betula alnobetula Ehrh. | Alnus viridis (Chaix) DC. subsp. viridis | | | Betula alnobetula Ehrh. | Alnus viridis (Chaix) DC. subsp. viridis | 460473 | 409852 |
| Betula ×atrata Domin | Betula ×aurata Borkh. | | | Betula atrata Domin | Betula aurata Borkh. | 461636 | 411516 |
| Betula cordifolia Regel | | a | | Betula cordifolia Regel | | 464298 | |
| Betula papyrifera Marshall var. cordifolia (Regel) Fernald | Betula cordifolia Regel | | i | Betula papyrifera Marshall var.cordifolia (Regel) Fernald | Betula cordifolia Regel | 464299 | 464298 |
| Betula alba L. var. cordifolia (Regel) Regel | Betula cordifolia Regel | | i | Betula alba L. var.cordifolia (Regel) Regel | Betula cordifolia Regel | 464300 | 464298 |
| Betula ×plettkei Junge | | a | | Betula plettkei Junge | | 467993 | |
| Betula pubescens Ehrh. var. pubescens | | a | i | Betula pubescens Ehrh. var.pubescens | | 474583 | |
| Betula chichibuensis H. Hara | | a | | Betula chichibuensis H. Hara | | 476235 | |
| Betula calcicola (W. W. Sm.) P. C. Li | | a | | Betula calcicola (W. W. Sm.) P. C. Li | | 476236 | |
| Betula delavayi Franch. var. calcicola W. W. Sm. | Betula calcicola (W. W. Sm.) P. C. Li | | i | Betula delavayi Franch. var.calcicola W. W. Sm. | Betula calcicola (W. W. Sm.) P. C. Li | 476237 | 476236 |
| Betula bomiensis P. C. Li | | a | | Betula bomiensis P. C. Li | | 476238 | |
| Betula delavayi Franch. | | a | | Betula delavayi Franch. | | 476239 | |
| Betula gynoterminalis Y. C. Hsu & C. J. Wang | | a | | Betula gynoterminalis Y. C. Hsu & C. J. Wang | | 476240 | |
| Betula skvortsovii McAll. & Ashburner | | a | | Betula skvortsovii McAll. & Ashburner | | 476241 | |
| Betula fargesii Franch. | | a | | Betula fargesii Franch. | | 476242 | |
| Betula austrosinensis Chun ex P. C. Li | Betula kweichowensis Hu | | | Betula austrosinensis Chun ex P. C. Li | Betula kweichowensis Hu | 476243 | 476601 |
| Betula ashburneri McAll. & Rushforth | | a | | Betula ashburneri McAll. & Rushforth | | 476245 | |
| Betula utilis D. Don subsp. jacquemontii (Spach) Ashburner & McAll. | | a | i | Betula utilis D. Don subsp. jacquemontii (Spach) Ashburner & McAll. | | 476246 | |
| Betula utilis D. Don subsp. albosinensis (Burkill) Ashburner & McAll. | | a | i | Betula utilis D. Don subsp. albosinensis (Burkill) Ashburner & McAll. | | 476247 | |
| Betula utilis D. Don subsp. occidentalis Kitam. | | a | i | Betula utilis D. Don subsp. occidentalis Kitam. | | 476249 | |
| Betula chitralica Browicz | Betula utilis D. Don subsp. occidentalis Kitam. | | | Betula chitralica Browicz | Betula utilis D. Don subsp. occidentalis Kitam. | 476250 | 476249 |
| Betula pendula Roth subsp. pendula | | a | i | Betula pendula Roth subsp. pendula | | 476251 | |
| Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | a | i | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | 476252 | |
| Betula pendula Roth subsp. szechuanica (C. K. Schneid.) Ashburner & McAll. | | a | i | Betula pendula Roth subsp. szechuanica (C. K. Schneid.) Ashburner & McAll. | | 476253 | |
| Betula ×caerulea Blanch. | | a | | Betula caerulea Blanch. | | 476254 | |
| Betula celtiberica Rothm. & Vasc. | | a | | Betula celtiberica Rothm. & Vasc. | | 476255 | |
| Betula pubescens Ehrh. var. pumila (L.) Govaerts | | a | i | Betula pubescens Ehrh. var.pumila (L.) Govaerts | | 476256 | |
| Betula alba L. var. pumila L. | Betula pubescens Ehrh. var. pumila (L.) Govaerts | | i | Betula alba L. var.pumila L. | Betula pubescens Ehrh. var.pumila (L.) Govaerts | 476258 | 476256 |
| Betula pubescens Ehrh. var. litwinowii (Doluch.) Ashburner & McAll. | | a | i | Betula pubescens Ehrh. var.litwinowii (Doluch.) Ashburner & McAll. | | 476259 | |
| Betula microphylla Bunge | | a | | Betula microphylla Bunge | | 476260 | |
| Betula delavayi Franch. var. forrestii W. W. Sm. | Betula delavayi Franch. | | i | Betula delavayi Franch. var.forrestii W. W. Sm. | Betula delavayi Franch. | 476264 | 476239 |
| Betula ×winteri Dugle | Betula ×koehnei C. K. Schneid. | | | Betula winteri Dugle | Betula koehnei C. K. Schneid. | 476265 | 7104 |
| Betula glandulifera (Regel) E. J. Butler | Betula pumila L. | | | Betula glandulifera (Regel) E. J. Butler | Betula pumila L. | 476266 | 7140 |
| Betula fruticosa auct. nonn. | Betula humilis Schrank | | | Betula fruticosa auct. nonn. | Betula humilis Schrank | 476293 | 7096 |
| Betula kwangsiensis F. P. Metcalf | Betula kweichowensis Hu | | | Betula kwangsiensis F. P. Metcalf | Betula kweichowensis Hu | 476600 | 476601 |
| Betula kweichowensis Hu | | a | | Betula kweichowensis Hu | | 476601 | |
| Betula lenta L. var. uber Ashe | Betula uber (Ashe) Fernald | | i | Betula lenta L. var.uber Ashe | Betula uber (Ashe) Fernald | 476734 | 315536 |
| Betula lenta L. f. uber (Ashe) McAll. & Ashburner | Betula uber (Ashe) Fernald | | i | Betula lenta L. f. uber (Ashe) McAll. & Ashburner | Betula uber (Ashe) Fernald | 476735 | 315536 |
| Betula japonica Thunb. | Alnus japonica (Thunb.) Steud. | | | Betula japonica Thunb. | Alnus japonica (Thunb.) Steud. | 481144 | 2460 |
| Betula serrulata Aiton | Alnus serrulata (Aiton) Willd. | | | Betula serrulata Aiton | Alnus serrulata (Aiton) Willd. | 481145 | 104813 |
| Betula lenta L. f. lenta | Betula lenta L. | | i | Betula lenta L. f. lenta | Betula lenta L. | 484012 | 7107 |
| Betula lenta L. var. lenta | Betula lenta L. | | i | Betula lenta L. var.lenta | Betula lenta L. | 484013 | 7107 |
| Betula papyrifera Marshall var. papyrifera | Betula papyrifera Marshall | | i | Betula papyrifera Marshall var.papyrifera | Betula papyrifera Marshall | 484014 | 7122 |
| Betula pendula Roth f. pendula | Betula pendula Roth subsp. pendula | | i | Betula pendula Roth f. pendula | Betula pendula Roth subsp. pendula | 484015 | 476251 |
| Betula pendula Roth var. pendula | Betula pendula Roth subsp. pendula | | i | Betula pendula Roth var.pendula | Betula pendula Roth subsp. pendula | 484016 | 476251 |
| Betula populifolia Marshall f. populifolia | Betula populifolia Marshall | | i | Betula populifolia Marshall f. populifolia | Betula populifolia Marshall | 484017 | 7134 |
| Betula procurva Litv. subsp. procurva | Betula procurva Litv. | | i | Betula procurva Litv. subsp. procurva | Betula procurva Litv. | 484018 | 7138 |
| Betula pubescens Ehrh. subsp. pubescens | Betula pubescens Ehrh. var. pubescens | | i | Betula pubescens Ehrh. subsp. pubescens | Betula pubescens Ehrh. var.pubescens | 484019 | 474583 |
| Betula pumila L. var. pumila | Betula pumila L. | | i | Betula pumila L. var.pumila | Betula pumila L. | 484020 | 7140 |
| Betula etnensis Raf. | Betula pendula Roth subsp. pendula | | | Betula etnensis Raf. | Betula pendula Roth subsp. pendula | 484963 | 476251 |
| Betula aetnensis J. Presl & C. Presl, orth. var. | Betula pendula Roth subsp. pendula | | | Betula aetnensis J. Presl & C. Presl, orth. var. | Betula pendula Roth subsp. pendula | 484964 | 476251 |
| Betula alba L. subsp. alba | Betula pubescens Ehrh. var. pubescens | | i | Betula alba L. subsp. alba | Betula pubescens Ehrh. var.pubescens | 486386 | 474583 |
| Betula fruticosa Pall. subsp. fruticosa | Betula fruticosa Pall. | | i | Betula fruticosa Pall. subsp. fruticosa | Betula fruticosa Pall. | 486387 | 7090 |
| Betula nana L. subsp. nana | Betula nana L. | | i | Betula nana L. subsp. nana | Betula nana L. | 486388 | 7117 |
| Betula albosinensis Burkill var. albosinensis | Betula utilis D. Don subsp. albosinensis (Burkill) Ashburner & McAll. | | i | Betula albosinensis Burkill var.albosinensis | Betula utilis D. Don subsp. albosinensis (Burkill) Ashburner & McAll. | 486389 | 476247 |
| Betula delavayi Franch. var. delavayi | Betula delavayi Franch. | | i | Betula delavayi Franch. var.delavayi | Betula delavayi Franch. | 486390 | 476239 |
| Betula platyphylla Sukaczev var. platyphylla | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | | i | Betula platyphylla Sukaczev var.platyphylla | Betula pendula Roth subsp. mandshurica (Regel) Ashburner & McAll. | 486391 | 476252 |