Rhamnus purshiana (cascara sagrada, cascara buckthorn, cascara, bearberry) is a species of buckthorn native to western North America, from southern British Columbia south to central California, and eastward to north-western Montana.
Cascara sagrada grows mainly in moist, acidic soil. It is most commonly found on the edges of deciduous forests or on the shady side of clearings. The tree grows to approximately 20 feet tall.
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