The genus Circaea contains 7–10 species of flowering plants, known as enchanter's nightshade, in the willowherb family, Onagraceae. They are woodland plants occurring in temperate regions of the Northern Hemisphere with one species, alpine enchanter's nightshade (Circaea alpina) being widespread throughout the Northern Hemisphere. The broad-leaved enchanter's nightshade (Circaea lutetiana) is found in Eurasia and the eastern enchanter’s nightshade (Circaea canadensis) is found in North America. In ...