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1 Subgenus Betulenta - Wintergreen oil birches
Bark on twigs rich in methyl salicylate (oil of wintergreen). Female catkins erect.
- Diploid (2n = 28).
- Betula lenta - Sweet birch or Cherry birch
- Betula lenta subsp. uber - Cherry Creek birch
- Hexaploid (6n = 84).
- Betula allegheniensis - Yellow birch (B. lutea)
- Decaploid (10n = 140).
- Betula austrosinensis - South China birch
- Betula globispica -
- Betula insignis -
- Betula medwediewii - Caucasian birch
- Duodecaploid (12n = 168).
- chromosome number not reported
- Betula corylifolia - Hazel-leaf birch
- Betula grossa - Japanese cherry birch
- Betula insignis -
2 Subgenus Betulaster - Large-leaf birches
Bark on twigs contains some methyl salicylate. Female catkins pendulous.
- Betula alnoides - Alder-leaf birch
- Betula alnoides subsp. luminifera -
- Betula maximowiczii - Monarch birch
3 Subgenus Neurobetula - Costate birches
Bark on twigs without methyl salicylate. Female catkins erect.
- Diploid (2n = 28).
- Betula calcicola -
- Betula chichibuenis -
- Betula costata -
- Betula nigra - River birch or Black birch
- Betula potaninii - Potanin's birch
- Tetraploid (4n = 56).
- Betula albosinensis - Chinese red birch
- Betula albosinensis var. septentrionalis - North Chinese red birch
- Betula ermanii - Erman's birch
- Betula jacquemontii (B. utilis subsp. jacquemontii) - White-barked Himalayan birch
- Betula utilis - Himalayan birch
- Hexaploid (6n = 84).
- Betula davurica -
- Betula delavayi - Delavay's birch
- Betula raddeana - Radde's birch
- Octoploid (8n = 112).
- Betula chinensis - Chinese birch
- chromosome number not reported
- Betula fargesii - Farges's birch
- Betula schmidtii - Schmidt's birch
4 Subgenus Betula - Typical birches
Bark on twigs without methyl salicylate. Female catkins pendulous.
- Diploid (2n = 28).
- Betula cordifolia - Heart-leaf birch or Mountain paper birch
- Betula pendula - Silver birch
- Betula mandschurica - Manchurian birch
- Betula mandschurica var. japonica - Japanese birch
- Betula neoalaskana - Alaska birch or Yukon birch
- Betula occidentalis - Water birch or Red birch (B. fontinalis)
- Betula platyphylla (Betula pendula var. platyphylla) - Siberian silver birch
- Betula populifolia - Gray birch
- Betula szechuanica (Betula pendula var. szechuanica) - Sichuan birch
- Tetraploid (4n = 56).
- Betula celtiberica - Iberian white birch
- Betula pubescens - White birch, European white birch or Downy birch
- Pentaploid (5n = 70).
- Betula kenaica - Kenai birch
- Hexaploid (6n = 84).
- Betula papyrifera - Paper birch, Canoe birch or White birch (sometimes tetraploid or pentaploid)
5 Subgenus Chamaebetula - Dwarf birches
Small shrubs with small rounded leaves. Female catkins pendulous.
- Diploid (2n = 28).
- Betula glandulosa (B. nana subsp. glandulosa) - American Dwarf birch
- Betula nana - Dwarf birch
- Tetraploid (4n = 56).
- Betula minor - Quebec dwarf birch
- Betula pumila - Swamp birch
- chromosome number not reported
- Betula fruticosa -
- Betula hallii - Cascades dwarf birch
- Betula humilis - Arctic dwarf birch
- Betula michauxii - Newfoundland dwarf birch
- Betula microphylla -
- Betula middendorffii -
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