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
- Betula pubescens subsp. tortuosa - Arctic White Birch
- Pentaploid (5n = 70).
- Betula kenaica - Kenai Birch
- Hexaploid (6n = 84).
- Betula papyrifera - Paper Birch, Canoe Birch or American White Birch (sometimes tetraploid or pentaploid)
Read more about this topic: Taxonomy Of Betula, Subgenus Betula
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“When I see birches bend to left and right
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—Robert Frost (1874–1963)