Plants that produce flowers , fruits and seeds and fruit seeds are covered with a specific coating are called angiosperms. The main plant in the diverse flora is the angiosperms. The number of living species in the world is about 2,6,000 . They have been categorized under 12000 people of 300 tribes. Emerging from the geological Cretaceous about 60 million years ago, they are still dominant in a wide area of the world.