References for Rhamnaceae
Brizicky, G.K. 1964. The genera of Rhamnaceae in the southeastern United States. J. Arnold Arbor. 45:439-463.
Johnston, M.C. 1963. A new name in Ceanothus. Leafl. West. Bot. 10:64.

Source for the Reference Lists

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