This book surveys the use of mind-altering plants in eleven societies in the Americas, Asia, Australia and New Guinea, ranging from the hunter-gatherers to complex ancient civilizations such as the Inca, the Moche, and the Maya. Those interested in rituals and religions of traditional societies and folk medicine will find a great deal of information in this concise, illustrated volume. Several themes emerge from de Rios"s cross-cultural examination of sacred plants. She argues convincingly that plant hallucinogens, which have been used from time immemorial, influenced human evolution. She discusses religious beliefs, including those of shamanism, which may have been influenced by the mind-altering properties of particular plants. She also focuses on the ways in which hallucinogens have influenced ethical and moral systems.