This Peterson Field Guide is designed to follow you into the field and is the most complete work available on the medicinal plants of western North America. Nearly 500 species are covered, with more than 530 color photographs. An index to medical topics helps locate information on specific ailments. Organized by flower color for fast identification. Symbols are provided for quick visual warnings for poisonous and allergenic plants. 5" x 7 1/2" / 442 pages. Paper