The vast country of Iran in south-west Asia constitutes in the Northern hemisphere a peculiar geographical unit which displays a remarkable biodiversity and various ecosystems with specific biological components .This unusual phytogeographical situation is due to certain factors, including diverse climate conditions, the existence of a central salt desert with an area of one million sq/km, and the presence of high barrier like mountains in some regions. Flora of the country is rich with nearly 8000 species. The exploitation of natural resources on the Iranian plateau goes back to "about 7000 years ago. The use of medicinal plants was the first method of treating diseases in ancient Iran and forms an important part of various cultures. It is estimated that nearly 850-1100 species is used as herbs in traditional medicine of the country. At the present time, despite a wide spread of modern medicinal compounds, still a high proportion of the rural people, use the traditional medicine for health purposes.