Used in pharmacognosy classes at Bastyr University, this text examines in-detail the principal constituents in plants. Filled with tables and figures, this book offers information and study questions on glycosides, terpenoids, volatile oils, tannins, carbohydrates, proteins, lectins, resins, gums, lipids, waxes, alkaloids, flavonoids, lignans, saponins and much more. This is a must for any student or practitioner interested in the scientific application of botanical medicine. Drying and various means of extracting the medicine from the plants are also discussed. Dr. Yarnell is a faculty member at Bastyr University and instructs courses in herbal sciences and naturopathic medicine programs.