Belladonna

Also known as deadly nightshade, Belladonna is a source of the poisonous drug atropine. In minute quantities, atropine, in the form of a sulfate, is used to dilate the pupils of the eye, to relieve pain, to diminish secretions, and to relieve spasms. In greater quantities, it was used to kill. Belladonna was believed to have been used in flying potions.