This book is a collection of 13 papers on diversity of various phyla of the plant kingdom. Contributed by over 30 reputed academicians and scientists, this book presents the current trends in the study of plant diversity with special reference to various flora zones. The book starts with an overview of the trends in the diversity of plants in India and then goes on to specific phyla and families of plants and crops. Some of the major themes which the editors have kept in mind are: Ecological importance, preservation of plant species, economic utility, biotechnological applications, ethnic botany and crop improvement. This book will be immensely useful to scientists, academicians and researchers in the areas of forestry, crop improvement, sustainability studies, biotechnology, ecology, and environment.