st john's wort

An herbal extract or dietary supplement prepared from the dried flowers and leaves of Hypericum perforatum, commonly used in traditional and alternative medicine to treat mild to moderate depression.

Any of various perennial herbs or shrubs of the genus Hypericum (family Hypericaceae), especially Hypericum perforatum, native to Europe and Asia, characterized by opposite leaves with translucent oil glands and clusters of bright, five-petaled yellow flowers.