Pharmacognosy is an established basic pharmaceutical science. This subject has changed considerably, from being largely descriptive botanical and mycological field to having more of chemical and biological focus. It has also evolved to include phytotherapy and nutra ceuticals. This book ?A Textbook of Pharmacognosy? written Pharmacy students, i.e., for undergraduate, postgraduate, paramedical and other professionals. The book has replaced the long confusing sentences with short explicit ones, so as to make the reading of the book a pleasurable experience. This book covers overall Twenty Nine chapters, designed in a simple and precise language. To make the book more useful, efficient, and effective; the meaning, features and approaches and other aspects of all the topics have been explain fully. The overall presentation of each chapter is more accessible, informative and comprehensive lucid. It is a unique book discussing principles, objectives and approaches of ?Pharmacognosy?. Great care has been taken to select critically important information and present it in a way that maximizes understanding.