The San Pedro Cactus and Peyote Cactus: Exploring the Differences and Similarities The San Pedro Cactus Trichocereus The San Pedro cactus Trichocereus pachanoi) is a tall, columnar cactus native to the Andes Mountains of Ecuador and Peru. It is known for its hallucinogenic properties due to the presence of mescaline, a psychoactive compound. The San […]