Marayur has more than 1000 species of flowering plants and is a well known repository of medicinal plants. There are 114 endemic species and the sighting of Aibizia lathamii, a critically endangered tree, was recently reported from the dry forests. Chinnar - the wildlife sanctuary in Marayur - has recorded the largest number of reptilian species, including the mugger crocodile, in Kerala. With 225 recorded species of birds, it is one of the richest areas of south India in avian diversity.