Research > Reference Library > Trees of Canada JOIN MAIL LIST: SEARCH: Discover GF Research Education Newsroom How to Help click image to enlarge Buckthorn cascaraRhamnus purshiana DC. Cascara is a small (<13 m) tree, and is often found on poorer sites as a shrub. First Peoples boiled the bark and used it as a laxative. Biochemists later found that the bark contained hydroxymethyl-anthraquinones as the active ingredients in the laxative.
	Tuscon, Arizona T:520.638.6152 F:520.638.6020 PO Box 4860 Banff, AB, Canada, T1L1G1 403.762.5400
	Website by the level conservation@globalforestscience.org