found: ITIS search, July 13, 2007(Betula pendula Roth, species, synonym: Betula verrucosa Ehrh., common name: European white birch)
found: GRIN taxonomy for plants, July 13, 2007(Betula pendula Roth, common names: European white birch, silver birch, weeping birch, synonym: Betula verrucosa)
found: Web. 3(European white birch (Betula pendula); often confused with a white birch (Betula alba))
found: Encyc. Am.:v. 3, p. 782 (European white, or silver, birch (Betula pendula))
found: Complete encyc. of trees and shrubs, 2003(Betula pendula, European silver birch, European white birch, Silver birch, Weeping birch, White birch)
