Rhamnus purshiana, commonly known as cascara sagrada, is a deciduous shrub or small tree native to the western regions of North America. It typically grows in moist, shady areas and can reach heights of up to 30 feet. The plant is recognized for its dark green leaves and small, yellow-green flowers that bloom in spring. The bark of Rhamnus purshiana is known for its natural laxative properties and has been used in herbal medicine for centuries. It contains compounds called anthraquinones, which stimulate bowel movements. Due to its medicinal uses, cascara sagrada is often found in dietary supplements and herbal remedies.