Belladonna
Belladonna, also deadly nightshade, common name for an Old World herb, and for a crude drug obtained from the plant. Belladonna is a biennial or annual plant with large simple leaves and bell-shaped flowers. The flower tube is five-pointed, dull purple or red-purple, and surrounded by five green sepals. The fruit is a single green berry that becomes purple to black with maturity. Belladonna is occasionally grown in gardens in North America but rarely becomes naturalized. It does not normally persist without cultivation. Other members of the nightshade family are sometimes erroneously called belladonna. All parts of the true belladonna are poisonous and narcotic. The leaves and root contain alkaloids; one, atropine, is used to dilate the pupils of the eyes, to facilitate eye examinations and as an antispasmodic in the treatment of asthma. In earlier times in Italy, extracts of belladonna were used by women for the cosmetic value of this dilating effect; such use explains the origin of t