References for Betulaceae
Brayshaw, T.C. 1976. Catkin Bearing plants (Amentiferae) of British Columbia. B.C. Prov. Mus., Victoria, BC. Occas. Pap. No. 18. 176pp.
Brayshaw, T.C. 1996b. Catkin-Bearing plants of British Columbia. Royal B.C. Mus., Victoria, BC.
Dugle, J.R. 1966. A taxonomic study of western Canadian species in the genus Betula. Can. J. Bot. 44:929-1007.

Source for the Reference Lists

George W. Douglas, Del Meidinger and Jim Pojar. 1998-2002. Illustrated Flora of British Columbia.