The comprehensive standard work in a revised and updated new edition. This book is the first comprehensive work worldwide that systematically explores the world of psychoactive plants based on the current state of scientific knowledge. The plants are described in monographs containing all relevant information on botany, appearance, cultivation methods, preparation and dosage, history, ritual and medicinal uses, ingredients, effects, market forms, and any applicable regulations. All plants are illustrated with images. An indispensable work for anyone interested in psychoactive plants and in-depth plant knowledge in general.