2. Materials and methods
2.1. Plant material
Plant material was collected from Hazara division of the North-western Frontier Province, Pakistan, in March 2005, authenticated by Prof. Dr. Jahandar Shah. Aerial parts of the plant were air-dried under shade for 2 weeks at room temperature. The dried plant material was later on chopped, pulverized and stored in a polyethylene bag under refrigeration for further experimentation.