| austria | | betula nana | species | 2 | 0 |
| austria | | betula pubescens | species | 5 | 0 |
| austria | | betula pubescens x betula nana | species | 2 | 0 |
| belarus | | betula humilis | species | 23 | 0 |
| belarus | | betula pendula var. carelica | varietas | 5 | 0 |
| belarus | | betula pubescens | species | 3 | 0 |
| belgium | | betula nana | species | 1 | 0 |
| brazil | | betula sp. rp-2014 | species | 3 | 0 |
| canada | | betula alleghaniensis | species | 2 | 0 |
| canada | | betula glandulosa | species | 2 | 0 |
| canada | | betula michauxii | species | 1 | 0 |
| canada | | betula papyrifera | species | 1 | 0 |
| canada | | betula pumila | species | 2 | 0 |
| canada | british columbia | betula glandulosa | species | 1 | 0 |
| canada | british columbia | betula nana | species | 1 | 0 |
| canada | british columbia | betula occidentalis | species | 4 | 0 |
| canada | british columbia | betula papyrifera | species | 1 | 0 |
| canada | british columbia | betula pendula | species | 1 | 0 |
| canada | british columbia | betula pubescens | species | 1 | 0 |
| canada | british columbia | betula pumila | species | 1 | 0 |
| canada | manitoba | betula neoalaskana | species | 2 | 0 |
| canada | manitoba | betula occidentalis | species | 2 | 0 |
| canada | newfoundland and labrador | betula glandulosa | species | 2 | 0 |
| canada | newfoundland and labrador | betula minor | species | 2 | 0 |
| canada | newfoundland and labrador | betula nana | species | 1 | 0 |
| canada | northwest territories | betula glandulosa | species | 6 | 0 |
| canada | northwest territories | betula neoalaskana | species | 4 | 0 |
| canada | northwest territories | betula pumila var. glandulifera | varietas | 2 | 0 |
| canada | nova scotia | betula michauxii | species | 2 | 0 |
| canada | nunavut | betula glandulosa | species | 10 | 0 |
| canada | ontario | betula alleghaniensis | species | 5 | 0 |
| canada | ontario | betula minor | species | 2 | 0 |
| canada | ontario | betula papyrifera | species | 5 | 1 |
| canada | ontario | betula pumila | species | 3 | 0 |
| canada | quebec | betula alleghaniensis | species | 6 | 0 |
| canada | quebec | betula cordifolia | species | 3 | 0 |
| canada | quebec | betula lenta | species | 4 | 0 |
| canada | quebec | betula nana | species | 12 | 0 |
| canada | quebec | betula papyrifera | species | 4 | 2 |
| canada | quebec | betula populifolia | species | 5 | 0 |
| canada | yukon | betula nana | species | 4 | 0 |
| canada | yukon | betula nana subsp. exilis | subspecies | 4 | 0 |
| canada | yukon | betula neoalaskana | species | 2 | 0 |
| canada | yukon | betula occidentalis | species | 2 | 0 |
| canada | yukon | betula papyrifera | species | 3 | 0 |
| china | | betula alnoides | species | 314 | 0 |
| china | | betula ermanii | species | 2 | 0 |
| china | | betula fruticosa | species | 2 | 0 |
| china | | betula luminifera | species | 5 | 0 |
| china | | betula microphylla | species | 2 | 0 |
| china | | betula ovalifolia | species | 2 | 0 |
| china | | betula platyphylla | species | 12 | 0 |
| china | | betula schmidtii | species | 4 | 0 |
| china | | betula utilis | species | 6 | 0 |
| china | | betula utilis subsp. albosinensis | species | 4 | 0 |
| china | beijing | betula alnoides | species | 3 | 0 |
| china | guangdong | betula austrosinensis | species | 4 | 0 |
| china | hebei | betula nigra | species | 1 | 0 |
| china | hebei | betula platyphylla | species | 0 | 1 |
| china | heilongjiang | betula davurica | species | 2 | 0 |
| china | inner mongolia | betula ermanii | species | 0 | 1 |
| china | inner mongolia | betula platyphylla | species | 0 | 1 |
| china | liaoning | betula platyphylla | species | 0 | 1 |
| china | shanxi | betula platyphylla | species | 0 | 1 |
| china | yunnan | betula alnoides | species | 3 | 0 |
| denmark | | betula pendula | species | 1 | 0 |
| finland | | betula nana | species | 6 | 0 |
| finland | | betula pendula | species | 70 | 0 |
| finland | | betula pubescens | species | 7 | 0 |
| finland | uusimaa region | betula pendula | species | 6 | 0 |
| germany | | betula alleghaniensis | species | 11 | 0 |
| germany | | betula humilis | species | 3 | 0 |
| germany | | betula nigra | species | 8 | 0 |
| germany | | betula pendula | species | 1 | 0 |
| germany | bavaria | betula grossa | species | 1 | 0 |
| germany | bavaria | betula nana | species | 12 | 0 |
| germany | bavaria | betula pendula | species | 2 | 0 |
| germany | hamburg | betula medwediewii | species | 1 | 0 |
| germany | hamburg | betula utilis | species | 1 | 0 |
| germany | hesse | betula alleghaniensis | species | 13 | 0 |
| germany | hesse | betula globispica | species | 1 | 0 |
| germany | hesse | betula lenta | species | 24 | 0 |
| germany | hesse | betula maximowicziana | species | 5 | 0 |
| germany | hesse | betula medwediewii | species | 4 | 0 |
| germany | lower saxony | betula davurica | species | 4 | 0 |
| germany | lower saxony | betula tianschanica | species | 1 | 0 |
| germany | lower saxony | betula utilis | species | 1 | 0 |
| germany | north rhine-westphalia | betula alleghaniensis | species | 2 | 0 |
| germany | north rhine-westphalia | betula grossa | species | 1 | 0 |
| germany | north rhine-westphalia | betula lenta | species | 1 | 0 |
| germany | north rhine-westphalia | betula medwediewii | species | 1 | 0 |
| germany | saxony | betula lenta | species | 1 | 0 |
| germany | saxony | betula maximowicziana | species | 11 | 0 |
| germany | schleswig-holstein | betula utilis | species | 3 | 0 |
| germany | schleswig-holstein | betula utilis subsp. jacquemontii | subspecies | 6 | 0 |
| greenland | | betula minor | species | 4 | 0 |
| greenland | | betula nana | species | 16 | 0 |
| iceland | | betula nana | species | 4 | 0 |
| iceland | | betula pubescens | species | 7 | 0 |
| iran | north khorasan province | betula pendula | species | 1 | 0 |
| ireland | | betula pubescens | species | 12 | 0 |
| italy | south tyrol autonomous region | betula pendula | species | 8 | 0 |
| japan | | betula chichibuensis | species | 16 | 0 |
| japan | | betula ermanii | species | 9 | 0 |
| japan | | betula grossa | species | 1 | 0 |
| japan | | betula maximowicziana | species | 3 | 0 |
| japan | | betula platyphylla var. japonica | varietas | 4 | 0 |
| japan | ehime prefecture | betula grossa | species | 1 | 0 |
| japan | ehime prefecture | betula sp. ym4252 | species | 1 | 0 |
| japan | fukushima prefecture | betula grossa | species | 2 | 0 |
| japan | fukushima prefecture | betula maximowicziana | species | 2 | 0 |
| japan | fukushima prefecture | betula platyphylla var. japonica | varietas | 1 | 0 |
| japan | gifu prefecture | betula costata | species | 6 | 0 |
| japan | gifu prefecture | betula grossa | species | 1 | 0 |
| japan | gifu prefecture | betula maximowicziana | species | 1 | 0 |
| japan | gifu prefecture | betula platyphylla var. japonica | varietas | 1 | 0 |
| japan | gunma prefecture | betula grossa | species | 1 | 0 |
| japan | gunma prefecture | betula maximowicziana | species | 1 | 0 |
| japan | gunma prefecture | betula platyphylla var. japonica | varietas | 1 | 0 |
| japan | hokkaido prefecture | betula apoiensis | species | 22 | 0 |
| japan | hokkaido prefecture | betula davurica | species | 1 | 0 |
| japan | hokkaido prefecture | betula ermanii | species | 13 | 2 |
| japan | hokkaido prefecture | betula maximowicziana | species | 5 | 0 |
| japan | hokkaido prefecture | betula ovalifolia | species | 19 | 0 |
| japan | hokkaido prefecture | betula platyphylla | species | 2 | 3 |
| japan | hokkaido prefecture | betula platyphylla var. japonica | varietas | 5 | 0 |
| japan | ibaraki prefecture | betula grossa | species | 2 | 0 |
| japan | iwate prefecture | betula maximowicziana | species | 2 | 0 |
| japan | iwate prefecture | betula platyphylla var. japonica | varietas | 1 | 0 |
| japan | kochi prefecture | betula grossa | species | 1 | 0 |
| japan | kumamoto prefecture | betula grossa | species | 1 | 0 |
| japan | kyoto prefecture | betula grossa | species | 1 | 0 |
| japan | miyazaki prefecture | betula grossa | species | 2 | 0 |
| japan | nagano prefecture | betula corylifolia | species | 2 | 0 |
| japan | nagano prefecture | betula davurica | species | 1 | 0 |
| japan | nagano prefecture | betula grossa | species | 3 | 0 |
| japan | nagano prefecture | betula maximowicziana | species | 2 | 0 |
| japan | nagano prefecture | betula platyphylla var. japonica | varietas | 6 | 0 |
| japan | saitama prefecture | betula chichibuensis | species | 5 | 0 |
| japan | saitama prefecture | betula corylifolia | species | 1 | 0 |
| japan | saitama prefecture | betula globispica | species | 7 | 0 |
| japan | shimane prefecture | betula grossa | species | 2 | 0 |
| japan | tochigi prefecture | betula corylifolia | species | 3 | 0 |
| japan | tochigi prefecture | betula grossa | species | 7 | 0 |
| japan | tochigi prefecture | betula schmidtii | species | 2 | 0 |
| japan | toyama prefecture | betula corylifolia | species | 1 | 0 |
| japan | toyama prefecture | betula costata | species | 1 | 0 |
| japan | toyama prefecture | betula ermanii | species | 1 | 0 |
| japan | toyama prefecture | betula grossa | species | 1 | 0 |
| japan | toyama prefecture | betula maximowicziana | species | 2 | 0 |
| japan | toyama prefecture | betula platyphylla var. japonica | varietas | 1 | 0 |
| japan | wakayama prefecture | betula grossa | species | 1 | 0 |
| japan | yamagata prefecture | betula maximowicziana | species | 1 | 0 |
| japan | yamanashi prefecture | betula grossa | species | 2 | 0 |
| japan | yamanashi prefecture | betula platyphylla var. japonica | varietas | 2 | 0 |
| kyrgyzstan | | betula tianschanica | species | 1 | 0 |
| kyrgyzstan | | betula turkestanica | species | 1 | 0 |
| latvia | | betula fruticosa | species | 4 | 0 |
| latvia | | betula humilis | species | 5 | 0 |
| lithuania | | betula costata | species | 1 | 0 |
| norway | | betula nana | species | 11 | 0 |
| norway | | betula pendula | species | 1 | 0 |
| norway | | betula pubescens | species | 5 | 0 |
| norway | more og romsdal county | betula pubescens | species | 0 | 2 |
| norway | oslo county | betula pubescens | species | 0 | 1 |
| poland | | betula humilis | species | 25 | 0 |
| poland | | betula pendula | species | 41 | 0 |
| poland | | betula pubescens | species | 12 | 0 |
| poland | | betula x obscura | species | 54 | 0 |
| poland | mazovia province | betula pendula | species | 1 | 0 |
| russia | | betula nana | species | 19 | 0 |
| russia | | betula pendula | species | 3 | 0 |
| russia | | betula pendula var. carelica | varietas | 21 | 0 |
| russia | | betula pubescens | species | 14 | 0 |
| russia | | betula pubescens x betula nana | species | 2 | 0 |
| russia | belgorod oblast | betula pendula | species | 0 | 1 |
| russia | krasnoyarsk krai | betula nana | species | 2 | 0 |
| russia | sakha republic | betula nana | species | 1 | 0 |
| russia | sakhalin oblast | betula middendorffii | species | 2 | 0 |
| russia | voronezh oblast | betula pendula | species | 0 | 1 |
| slovakia | | betula pubescens | species | 2 | 0 |
| spain | | betula pubescens | species | 1 | 0 |
| sweden | | betula alleghaniensis | species | 1 | 0 |
| sweden | | betula humilis | species | 1 | 0 |
| sweden | | betula nana | species | 3 | 0 |
| sweden | | betula pendula | species | 3 | 0 |
| sweden | | betula pubescens | species | 2 | 0 |
| switzerland | geneva region | betula pendula | species | 2 | 0 |
| thailand | | betula alnoides | species | 15 | 0 |
| united kingdom | | betula nana | species | 9 | 0 |
| united kingdom | | betula nigra | species | 2 | 0 |
| united kingdom | | betula pendula | species | 5 | 0 |
| united kingdom | | betula pubescens | species | 9 | 0 |
| united kingdom | england | betula medwediewii | species | 16 | 0 |
| united kingdom | england | betula nana | species | 16 | 0 |
| united kingdom | scotland | betula pendula | species | 39 | 0 |
| united states | | betula glandulosa | species | 2 | 0 |
| united states | | betula lenta | species | 3 | 0 |
| united states | | betula maximowicziana | species | 1 | 0 |
| united states | | betula nana | species | 2 | 0 |
| united states | | betula neoalaskana | species | 3 | 0 |
| united states | | betula nigra | species | 5 | 0 |
| united states | | betula papyrifera | species | 4 | 0 |
| united states | | betula populifolia | species | 4 | 0 |
| united states | alaska | betula neoalaskana | species | 1 | 0 |
| united states | maryland | betula platyphylla | species | 3 | 0 |
| united states | michigan | betula papyrifera | species | 2 | 0 |
| united states | minnesota | betula papyrifera | species | 0 | 1 |
| united states | north dakota | betula occidentalis | species | 2 | 0 |
| united states | north dakota | betula pumila | species | 2 | 0 |
| united states | texas | betula papyrifera | species | 51 | 0 |
| united states | virginia | betula lenta | species | 2 | 0 |
| united states | washington | betula nigra | species | 4 | 0 |
| united states | wisconsin | betula alleghaniensis | species | 6 | 0 |
| united states | wisconsin | betula papyrifera | species | 6 | 1 |