>>364366For info on edible plants and their identification:
Edible Wild Plants: A North American Field Guide to Over 200 Natural Foods - Organized by season. 400 color photos.
The Forager's Harvest: A Guide to Identifying, Harvesting, and Preparing Wild Edible Plants - Calendar of harvest times, guide for positive identification. 218 color photos.
Nature's Garden: A Guide to Identifying, Harvesting, and Preparing Wild Edible Plants - Second book by Thayer's after Forager's Harvest. 512 color photos.
A Field Guide to Edible Wild Plants: Eastern and central North America (Peterson Field Guides) - How to recognize species, some preparation instruction. 400 drawings, 78 color photos.
Common Poisonous Plants and Mushrooms of North America - Extensive info on poisonous plants. A must-have if you plan on eating any plant that doesn't have a very distinct appearance like cattails or acorns.
Don't use this for identification, but as a good extensive source for information on plants that you've ALREADY identified:
Identifying and Harvesting Edible and Medicinal Plants in Wild (and Not So Wild) Places - How to find and prepare, but not identify. 260 drawings.