Plants have been known for their medicinal properties for many centuries. In mythology and tales of ancient times lie clues to their usage and often the embellished claims of legend hold a grain of scientific truth. This book examines the history, folklore and medicinal uses of sixteen iconic plants and fungi, and the active substances which can be isolated from them. From notorious murders, accidental poisonings, possession by evil spirits and witches' brews to drugs which have revolutionised modern medicine, this book explores the power of plants.