St. John's wort (Hypericum perforatum) is one of the best-selling herbal medicines in the world. For that reason, research into all aspects of St. John's wort continues to intensify. Hypericum: The Genus Hypericum summarizes the current knowledge on a wide range of issues, such as botany, plant infections, cultivation, manufacturing, standardization, quality control, biochemistry, pharmacology and clinical application. This landmark book tackles issues not previously addressed, such as selection of the pharmacologically active compounds, application for severe depression, mechanisms of action, long-term effects and risks, marketing issues (dietary supplements or drugs), and comparison to synthetic drugs for the same indications. Containing many updated references, Hypericum will be of immense value to those involved in industry and academia alike, including researchers, producers, processors, importers and end users.