Berberis verruculosa

Berberis verruculosa, the warty barberry or warted barberry, is an evergreen shrub in the family Berberidaceae. It ranges in size from 1–2 m, and is native to western China (Gansu, Sichuan, Yunnan). It gets its common name from its "warty" stems, that have rounded, more or less identical, raised spots. Berberis verruculosa is a shrub up to 100 cm tall, with yellow spines along the twigs. Leaves are 1.5–2 cm long, hard, leathery, glossy dark green above, vivid white below with stomatal wax; in cold winter weather, the leaves may turn purplish-green above on exposed shoots. The flowers are small, yellow, and mature into dark purple berries 6–10 mm long....read more on Wikipedia.