Grasslands with sparse tree growth as well as pure patches of grasslands occur in the sanctuary to a limited extent. The former are mostly confined to the hills above Dharbhakulam along the Suchimala hills and the latter between the evergreen patches. Grasslands that are in the evergreen zone do not represent the climax type of vegetation, but are only seral in nature in the gradual retrogression of the forests. The grassy meadows at the hilltops owe their origin to the prevalence of high velocity wind to which these regions are exposed and the pronounced western aspects of the hill tops. These factors are not at all conducive for the growth of trees and shrubs and result in the domination of grasses in these regions. Secondary grass growth is observed at Pullumeth near Rosemala settlement and is dominated by Pennisetum typhoides. The dominant species in the grassland region of this sanctuary are Chrysopogon hackelii, Cymbopogon flexuosus, Cyrtococcum longipes, Digitaria ciliaris, Eleusine indica, Panicum maximum, Pogonatherum crinitun, Pseudanthisstiria umbellata, Setaria intermedia, Themeda cymbaria, T. triandra, Alloteropsis cimicina, Apluda mutica, Aristida stacea, Arundinella leptochlora, Chloris barbata, Cynodon dactylon, Jansenella griffithiana, etc.