Drainage basin: The area drained by a river and its tributaries. A drainage basin is considered to be an open system because water can be added or lost from a drainage basin. Source: The beginning of a river. A river may have multiple sources.
Milk thistle (Silybum marianum) is a thorny plant presenting decorative leaves with a white pattern of veins and purple flower heads. The plant originates from mountains of the Mediterranean region, where it forms scrub on a rocky base.
Milk thistle (Silybum ebumeum or Silybum marianum) has been used for over 2000 years as a. remedy for various types of liver disease. Since 1969 compounds of milk thistle have been. available for medical use in Europe.