text: Lophophora williamsii, (Eng, lō-fof′ŏ-ră wil-yăm′sē-ī), better known by its common name Peyote, but also sometimes called Mescal Button or the Divine Cactus, is a small, spineless cactus whose native region extends from the southwestern United States, specifically in the southwestern part of Texas, through central Mexico.