Oregon Grape Root Source & Identity
Oregon grape root in the trade is normally the root of Mahonia aquifolium (Pursh) Nutt., an evergreen shrub of the Berberidaceae with spiny, holly-like leaflets, yellow spring flowers and blue-black berries. The part used is the root with its rhizome, recognized by a bright yellow inner wood. Leaf, flower and berry are not part of this Oregon grape root extract.
Several plants share the name. Cascade or dull Oregon grape and creeping Oregon grape are other Mahonia species, and the genus is placed within Berberis in some floras, so a specification should state the Latin binomial the buyer expects. The yellow root holds isoquinoline alkaloids such as berberine, named here only as a family and without any content figure.












