Synopsis The present protected area network is about four per cent of the geographical area of the country and needs to be expanded to incorporate more protected regions having high conservation value. Highest priority towards the protection and conservation of biodiversity and basic systematic inventory of the biota should be given to parks and reserves. The protected areas having the status of National Parks and Reserves have a significant and very vital role to play in the conservation and sustainable utilization of biodiversity, because of their high potential for monitoring of populations, ecological processes and the specialized habitats. Rajaji National Park is among one of such important protected areas in sub-Himalayan tracts of Uttar Pradesh, due to its very rich biological wealth. The exhaustive systematic inventorisation of the biological wealth of the park is of immense value, particularly at the time when we have entered into the 21 century with new hopes and challenges. The present book provides an account of 812 species of Angiosperms which indicates the rich biodiversity of the park. The book also provides about the details of species diversity, ecosystem diversity and faunal diversity. The faunal wealth covers mammals, birds, reptiles, amphibians etc. Further, the plant resources, use of protected areas, plant-animal interaction and conservation of biodiversity has been discussed in the present book. The nomenclature of the taxa has been updated in the light of the International Code of Botanical Nomenclature. The present book will be of immense use for the students and teachers of botany, foresters, park managers, environmentalists, conservationists and planners closely associated with sustainable utilization and for wise management of biodiversity.