For more than twenty years this pioneering work has served as a bible for herbalists throughout the world.  It is an illustrated encyclopedic guide to more than two hundred medicinal plants found in North America, with descriptions of each plant's appearance and uses, and directions for methods of use and dosage.  Native American traditions are compared with traditional uses of the same plants among other cultures where the science of herbs has flourished, particularly in Russia and China.  Included is an annotated bibliography of pertinent books and periodicals.