Actaea simplex, the baneberry or bugbane, is a flowering plant in the buttercup family Ranunculaceae. A clump-forming rhizomatous herbaceous perennial, its native range includes the Kamchatka, Sakhalin and Siberian regions of Russia, western China, Manchuria, Mongolia, Korea and Japan. Plants may be harmful if eaten, and the sap may irritate the skin. The genus name Actaea is the Latin name adopted by Linnaeus from Pliny. The specific epithet simplex means simple or unbranched. The common name "bugbane" refers to the fact that the leaves' scent repels insects.