The use of hallucinogenic plants has been a part of human experience for millennia, yet modern Western societies have only recently become aware of the significance that these plants have had in shaping the history of diverse cultures. Capable of bringing human beings in closer touch with the spirit worlds, hallucinogenic plants have long been venerated as aids to mental health and as the sacred connection to the mystical. The authors of this definitive book examine the cross-cultural ceremonial and ritual use of many hallucinogenic substances. Profusely illustrated, this book contains an extensively researched plant lexicon, providing common and botanical names, history, ethnography, preparation, chemical components, usage in healing, and effects for 91 hallucinogenic plants.