The book is a horticultural, botanical and ethnobotanical monograph of Brugmansia (Solanaceae), the most potent of South American entheogens (psychoactive plants used for religious/spiritual purposes in shamanic cultures). Brugmansia is the only widespread continental plant genus of several species known solely in cultivation, and with now nearly 2000 cultivars, this book provides a world cultivar register with reference to the International Code of Nomenclature for Cultivated Plants. This is the first full taxonomic revision of the genus Brugmansia ever published, and combines original field research and horticultural expertise with a review of well over 600 bibliographic references, covering a range of fields from anthropology and ethnobotany, through to biology, pathology, biotechnology and horticulture.