Synopsis The book starts with chapter on drugs obtained from algal ibource. This is followed by chapters on drugs obtained from fungi, lichens, pteridophytes, gymnosperms and angiosperms. Chemical structures of the plant constituents is the main feature of the book as scientists are more interested in chemical aspects of herbal medicine. Medical and herbal terminology has been included to make the concept clearer. Selected references have been added at the end to the book. Various institutions and books on pharmacognosy, chemistry, botany, Ayurveda and homeopathy were consulted to obtain accurate account.