These forests are categorised by their dominating plant species such as 1) East Himalayan Sal Forest present on the lower slopes of Mahananda Wildlife Sanctuary contains Sal, Khair, Simul, Sissoo, Riverine grasslands and various rare species of plants like Orchids 2) East Himalayan Upper Bhabar Sal mainly present at Jalpaiguri district which is characterised by dense population of Microstegium chiliatum, Sal i.e. Shorea robusta. Others are Terminalia tomentosa, Schima wallichii And the 3) Eastern Tarai Sal Forest generally found in lower altitudes compared to other two types of forest. This type of forest characterised by various species of bamboos, ferns, and Sal which is found in Baikunthapur Forest, near Siliguri city.