The park and remaining forests in the buffer zone outside the park have retained the natural vegetation communities distinctive of the Himalayan lowlands, including Sal (Shorea robusta) forest, khair (Acacia catechu) and sissoo (Dalbergia sissoo) riverine forests, and grasslands dominated by species of the genera Saccharum, Themeda, and Imperata (Chaudhary, 1998;Carter et al., 2013).