Dried leaves and flowering tops of Datura stramonium L., Solanaceae or its varieties. Used in traditional medicine in treatment of asthma. Habit. Europe, Asia, America. Constit. Leaves: 0.25-0.45% alkaloids consisting of atropine, hyoscyamine, and scopolamine; proteins, albumin. Seed: the same alkaloids but in lesser amounts; fixed oil, malic acid proteins. Comprehensive monograph: A. F. Blakeslee, The Genus Datura (Ronald Press, New York, 1959) 289 pp. Review: V. E. Tyler et al. in Pharmacognosy, 9th Ed., (Lea & Febiger, Philadelphia, 1988) pp 197-199.