Mahonia aquifolium
（重定向自Oregon grape root）
![](/Images/godic/202501/31/Mahonia_aquifolium1359.jpg")
![The yellow flowers are in a raceme 3–8 cm long. Bombus species and other insects pollinate the flowers.](/Images/godic/202501/31/Berberis_aquifolium_42071359.JPG")
![Each of the six stamens, opposite the petals, terminate in two spreading branches. The six bright yellow petals are enclosed by six bright yellow sepals. At the base of the flower are three greenish-yellow bracts. Less than half as long as the sepals, only one is partially visible.](/Images/godic/202501/31/Mahonia_aquifolium_NRM1359.jpg")
Mahonia aquifolium (Oregon-grape or Oregon grape) is a species of flowering plant in the family Berberidaceae, native to western North America. It is an evergreen shrub growing to 1 m (3 ft) tall by 1.5 m (5 ft) wide, with pinnate leaves consisting of spiny leaflets, and dense clusters of yellow flowers in early spring, followed by dark bluish-black berries.