This book deals with the significance and importance of medicinal plants which includes an account of the numerous physiological activities, right from the primitive age with particular emphasis on chemistry of flavonoidal constituents of Leguminosae plants. It incorporates the applications of modern techniques for separation, isolation and structural establishment of bioactive flavonoidal constituents of following Leguminosae family 1. Cassia sophera Linn. 2. Dolichos lablab Linn. 3. Acacia arabica Willd. So this book is very useful for the systematic phytochemical analysis of Flavonoidal constituents present in different medicinal plants.