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A birch tree is a thinleaved deciduous hardwood tree of the genus Betula.[1] They are in the family Betulaceae, which also includes alders, hazels, and hornbeams.

Birch
Betula pendula 001.jpg
Silver birch
Scientific classification
Kingdom:
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Order:
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Genus:
Betula

Betula contains 30 to 60 species of which 11 are on the IUCN 2011 Green List of Threatened Species. They are usually rather short-lived pioneer species widespread in the Northern Hemisphere.[2]

ReferencesEdit

  1. Sunset Western Garden Book, 1995:606–607
  2. Ashburner K. & McAllister H.A. 2013. The genus Betula: a taxonomic revision of birches. Royal Botanic Gardens, Kew.