"The Forager's Harvest: A Guide to Identifying, Harvesting, and Preparing Edible Wild Plants" by Samuel Thayer

Product Description (Amazon.com Editorial Review):

A practical guide to all aspects of edible wild plants: finding and identifying them, their seasons of harvest, and their methods of collection and preparation. Each plant is discussed in great detail and accompanied by excellent color photographs. Includes an index, illustrated glossary, bibliography, and harvest calendar. The perfect guide for all experience levels.