Anthropologist and ethnopharmacologist Christian Ratsch provides the latest scientific updates to this classic work on psychoactive flora by two eminent researchers. • Numerous new and rare color photographs complement the completely revised and updated text. • Explores the uses of hallucinogenic plants in shamanic rituals throughout the world. • Cross-referenced by plant, illness, preparation, season of collection, and chemical constituents. • First edition sold 33,000 copies.