 Christian Rätsch's "The Encyclopedia of Psychoactive Plants" describes the botany, history, distribution, cultivation, preparation, and dosage of more than 400 psychoactive plants (while not strictly plants, the encyclopedia also includes psychoactive fungi).The encyclopedia also offers information on ritual and medicinal use (see also ethnopharmacology).The encyclopedia features 168 detailed monographs on the major psychoactive plants ("e.g.