Lophophora williamsii (pronounce /loʊˈfɒfərə wɪlˈjæmsiaɪ/, lō-fof′ŏ-ră will-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. They are found primarily in the Chihuahuan desert and in the states of Tamaulipas and San Luis Potosi amongst scrub, especially when limestone is present in the soil.