This field guide enables amateurs to identify plants in the Northern Rocky Mountains especially those in Idaho and Montana, including the Lolo Trail, and four parks: Craters of the Moon National Monument and Glacier, Grand Teton, and Yellowstone National Parks. Over 1,000 color photographs of over 490 different plants arranged by color. Plant characteristics in ordinary language, not technical jargon. Descriptive text includes blooming period and other important details.