Common barberry Berberis vulgaris

Pests and diseases are seldom a problem on cultivated barberries. Many states prohibit growing common barberry Berberis vulgaris), which is an alternate host to a rust fungus that also attacks cereal grains. Check with your extension agent for local restrictions. 

Henderson, G. A., and G. W. Hay The Carbohydrates of the Leaves of Common Barberry (Berberis vulgaris). The Extraction, Fractionation and Structural Studies of Selected Non-Cellulosic Polysaccharides. Carbohyd. Res. 23, 379 (1972). 

Common/vernacular names Barberry, berberis, common barberry, and European barberry B. Vulgaris), berberis, Oregon grape, and trailing mahonia Mahonia aquifolium). 

---