Cascara - Frangula purshiana
Often an understory shrub, Cascara can reach tree-size with a trunk up to a foot in diamter and a rounded crown. The leaves are blunt with small teeth and elliptical in shape. The small greenish flowers are bell-shaped and borne in clusters. The petals are tiny but the sepals visible. The fruit is round and purplish black when mature. Primarily a west coast species, Cascara is also found in the mountains of eastern Washington, and as far as western Montana. The species is perhaps best known for its bark which has been traditionally used as a laxative.