The Solanaceae, nightshade or potato family, derives its name probably from the Latin sol or solis, "sun," from the perceived resemblance of some of its flowers to the sun and its rays. It contains about 85 genera and between 2000 and 4000 species depending on how its circumscription is viewed, and it includes many very familiar species such as eggplant, belladona, peppers, jimsonweed, potatoes, tobacco, tomatoes, mandrake and petunias. Many species in this family have evolved alkaloids presumably to protect them from animal predators, and these alkaloids in some cases are beneficial to humans and in others poisonous. The flowers are typically funnelform with five fused petals, the leaves are alternate, and the fruits are either berries or dehiscent capsules. Alkaloids in the family include scopolamine, atropine, nicotine and the less well known by name but oft experienced capsaicin (in peppers).