Berberis aquifolium

Berberis aquifolium, the Oregon grape, holly-leaved barberry, or Mahonia, is a North American species of flowering plant in the family Berberidaceae. It is an evergreen shrub growing up to 3 metres (10 ft) tall and 1.5 m (5 ft) wide. It has pinnate leaves consisting of spiny leaflets, exhibiting dense clusters of yellow flowers in early spring, followed by dark bluish-black berries. The berries are a part of the traditional diet of some indigenous peoples of the Pacific Northwest and the species serves as the state flower of Oregon.

from Wikipedia