Rhamnus purshiana Effects, Dosage, and Side Effects Bitter Bark; California Buckthorn; Chittem Bark; Purshiana Bark; Sacred Bark; Sagrada Bark

The Buckthorns Rhamnus are a genus (or two genera, if Frangula is treated as distinct) of about 100 species of shrubs or small trees from 1-10 m tall (rarely to 15 m), in the buckthorn family Rhamnaceae. They are native throughout the temperate and subtropical Northern Hemisphere, and also more locally in the subtropical Southern Hemisphere in parts of Africa and South America.