H. muticus, Linne, Egyptian henbane (Egypt, India); leaves entire or toothed, petiolate; calyx striated, pubescent; corolla yellow or nearly white; pyxis cylindrical not urn-shaped. The commercial drug is imported in large quantity from Egypt, often with a considerable proportion of stout, yellowish stalk; used as source of hyoscyamine (0.2 to 1.0 per cent.).