 Its roots are traditionally used to induce vivid (and according to the Xhosa, prophetic) lucid dreams during the initiation process of shamans, classifying it a naturally occurring oneirogen similar to the more well-known dream herb "Calea ternifolia".Peyote a small spineless cactus has been a major source of psychedelic mescaline and has probably been used by Native Americans for at least five thousand years.Most mescaline is now obtained from a few species of columnar cacti in particular from San Pedro and not from the vulnerable peyote.