Echinopsis pachanoi Wikipedia. Echinopsis pachanoi syn Trichocereus pachanoi — known as San Pedro cactus — is a fast growing columnar cactus native to the Andes Mountains at 2 000–3 000 m 6 600–9 800 ft in altitude It is found in Argentina Bolivia Chile Ecuador and Peru and it is cultivated in other parts of the world Uses for it include traditional medicine and traditional veterinary ...