- Description of Betulaceae - Account of the family, including habit and leaf form, anatomy, morphology, physiology, biochemistry and geography.
www.keil.ukans.edu/delta/angio/www/betulace.htm
- The Betulaceae - Describes the distinguishing characteristics of this family (the birch family) of monoecious trees and shrubs, comprising 6 genera.
www.botany.hawaii.edu/faculty/carr/betul.htm
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