Lophophora williamsii or peyote is a small, spineless cactus with psychoactive alkaloids, particularly mescaline. Peyote is a Spanish word derived from the Nahuatl or Aztec meaning "glisten" or "glistening".
Peyote is native to Mexico and southwestern Texas. It is found primarily in the Chihuahuan Desert and in the states of Coahuila, Nuevo León, Tamaulipas, and San Luis Potosí among scrub. It flowers from March to May, and sometimes as late as September. The flowers are pink, with thigmotactic anthers (like Opuntia). Known for its psychoactive properties when ingested, peyote is used worldwide having a long history of ritualistic and medicinal use by indigenous North Americans. Peyote contains the hallucinogen mescaline.