It comes from the roots, wood, bark of Mahonia Vulgaris and
M.Aquitolium.
Barberry is an erect, deciduous shrub which has grey and thorny branches.
It is genus of about 400-450 species of deciduous and evergreen shrubs and
native to the temperate and subtropical regions Europe, north America,
south America, Asia and Africa.
Mahonia is a popular landscape shrub and genus of barberry. The plants
have edible red, orange fruit like berries. The bright yellow flowers
bloom in the late spring, become dark drooping bunches of red berries to
fall.