http://www.yearstoyourhealth.com/ - Milk thistle is a thistle of the genus Silybum Adans., a flowering plant of the daisy family (Asteraceae). The plant is native to the Mediterranean regions of Europe, North Africa and the Middle East. The name "milk thistle" derives from a feature of the leaves, which are prominently banded with splashes of white. Historically, these milky bands were thought to be Mother Mary's milk, and this is the origin of another common name, St. Mary's thistle.