This book has been compiled on the basis of collections made by the authors over the last two decades. An attempt has been made by the authors to assign each species its correct botanical name. Nomenclature has been updated in accordance with the latest version of the ICBN. Valid names have been printed in bold followed by synonyms in italics. Families have been arranged according to Bentham and Hookers system of classification with a few amendments wherever necessary. To enable the readers to make an easy reference the arrangement of genera within the family and species within each genus are in alphabetical order.