Learn about well-regarded medicinal plants that are used as supplements and sometimes as alternatives for prescription drugs. This guide identifies the key traits, habitats, uses, and warnings for more than 530 of the most significant medicinal plants in the eastern and central United States and Canada including both native and alien species. Includes 700+ images, the organization-by-colour system, and simplified warnings make identifying medicinal plants fast and easy. This new edition is also printed on crisp matte paper, which is easy to read in the field.