This richly illustrated reference guide treats the subject of herbal medicines in an integrated fashion with reference to pharmacognosy, pharmacology and toxicology. It will help to enable internists, phytotherapists, physicians, healthcare practitioners as well as students to understand why, when and how herbal medicines can be used in the treatment of diseases. A great deal of pathology and therapeutic information is also included. Numerous tables as well as figures clarify complex mechanisms and other information. The most important medicinal plants and drugs are illustrated with exceptional color plates.