Flower of St. John's Wort (IMAGE) Technische Universität Dresden Caption The flowers of St. John's Wort (Hypericum perforatum) have not only healing but also catalytic effects. Credit Julia Naumann Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.