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St John's Wort (Hypericum perforatum). This evergreen shrub is found in temperate regions throughout Europe and far-western Asia. Preparations of its flowers and leaf tips are used in herbal medicine as a wound healer and anti- depressant. It is also used to treat bladder and pulmonary complaints. In ancient times, it was believed to ward off evil spirits. (KEYSTONE/SCIENCE PHOTO LIBRARY/TH FOTO-WERBUNG)