Description: Most psychoactive cacti contain mescaline as their primary active chemical. The best known of these are San Pedro, Peruvian Torch, and Peyote (separate vault). (Cactaceae, Trichocereus (New: Echinopsis), bridgesii; cuzcoensis; fulvinanus; pachanoi; peruvianus; macrogonus; taquimbalensis; terscheckii; validus; werdermannianus)