Berberis vulgaris L., also known as common barberry, European barberry or simply barberry, is a shrub in the genus Berberis. It produces edible but sharply acidic berries, which people in many countries eat as a tart and refreshing fruit.
The shrub is native to central and southern Europe, northwest Africa and western Asia; it is also naturalised in northern Europe, including the British Isles and Scandinavia, and North America. In the United States and Canada, it has become established in the wild over an area from Nova Scotia to Nebraska, with additional populations in Colorado, Idaho, Washington State, Montana, and British Columbia. Although not naturalised, in rural New Zealand it has been widely cultivated as a hedge on farms. It is cultivated for its fruits in many countries.
The berries are edible and rich in vitamin C, though with a very sharp flavor; the thorny shrubs make harvesting them difficult, so in most places, they are not widely consumed.
Barberry is closely related to Oregon grape. Barberry, Oregon grape, golden seal and coptis all contain isoquinolone alkaloids. Berberine is the most prominent of these alkaloids.
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