New York Metropolitan Flora

Key to the genera of Betulaceae

1. Multi-trunked shrubs...2
1. Single-trunked, small to large trees...3

2. Leaf apices acuminate...Corylus
2. Leaf apices rounded or acute...Alnus

3. Buds stalked...Alnus
3. Buds sessile...4

4. Many leaves paired at the nodes, especially in 2+-year-old twigs...Betula
4. None to few leaves paired at the nodes...5

5. Bark smooth; bud scales not striate...Carpinus
5. Bark rough, flaky, especially in older trees; bud scales striate...Ostrya

List of Betulaceae Genera

References to Betulaceae

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