Much of the Sirumalai is covered by deciduous forests - the lower slopes by dry deciduous and the higher slopes and riverine valleys by moist and wet deciduous forests. Trees such as Terminalia , Shorea , Magnolia champaca are dominant in these hills. Other rare plants such as Lianas and Orchids also occur in the higher elevation evergreen tracts. Coffee estates form a major portion of present-day landscape. These Reserve Forests are protected under Tamil Nadu Forest Department.