Caption: St. John's Wort (herb) crystals. St John's Wort used alone refers to the species Hypericum perforatum, also known as Klamath weed or goat weed - but it can be used to refer to any species of the genus Hypericum. Hypericum perforatum is sometimes called Common St. John's Wort to distinguish it. It is a yellow-flowering, rhizomatous, perennial herb indigenous to Europe, which has been introduced to the Americas and grows wild in many meadows. The name comes from the fact that it traditionally flowers by and is harvested on St John's day; all above-ground parts are cut and dried for later use in the form of herbal tea, which has long been enjoyed both for its taste and for its medicinal properties. The first recorded use of Hypericum for medicinal purposes dates back to ancient Greece, and it has been used ever since. The herb was also used by Native Americans internally as an abortifacient and externally as an anti-inflammatory, astringent, and antiseptic. In modern medicine it is commonly used as a treatment for depression and anxiety disorders.
Magnification*: x40
Type: LM
Copyright 1985 Dennis Kunkel Microscopy, Inc.
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