Sri Lanka is a relatively small continental island, it exhibits a remarkable diversity of forest types, which are among the biologically one of richest forests in Asia. In these forests plant species show extraordinary patterns of localized distribution. Sri Lanka's forest became one of highest density of species diversity in the world. (2.17 BioD index) Sri Lanka natural forests cover about 12,493 km2 (65,610 km2 total land area) 29.46% According to the National Red List said, Sri Lanka counts 253 land species, 245 species of butterflies, 240 birds, 211 reptiles, 748 evaluated vertebrates and 1,492 invertebrates. Forest coverage is about 70% tropical dry monsoon forests, 15% tropical moist monsoon forests and 5% tropical lower montane forests. By the dawn of the 19th century, Sri Lanka's