One image of Dull Oregon Grape, Mahonia nervosa, Berberis nervosa, a member of the barberry family, Berberidaceae, is separated into the narrowly-defined genus Mahonia or the broader taxonomic concept of the genus Berberis. It occurs ifrom northen California to British Columbia in the coastal mountains. Dull Oregon Grape is used interchangeably with and little distinguished from Oregon Grape in the herb and horticultural trade. Used by native groups for stomach problems, bleeding, tonic, eyewash, to purify the blood, etc. It has sometimes been suggested as a useful substitute for other berberine-rich plants such as goldenseal Hydrastis canadensis.