In the present volume systematic enumeration of families Nyctaginaceae to Ceratophyllaceae is given. Families are arranged according to Bentham and Hooker’s system with incorporation of recent changes. Under each family key to the genera, followed by genus with its authority, key to the species and species enumeration is given. The genera under the family and species under the genera are arranged in alphabetical sequence. Keys are of the indented type. The enumeration of the species includes citation according to ICN, basionym and synonyms, if any to connect to Flora of British India and Flora of Presidency of Madras, description and distribution in the Eastern Ghats, flowering and fruiting period, vernacular names, specimens examined and distribution in India and world. Index to families, genera and species is given at the end. Line drawings of most of the species and photographs of many species are also given.