Their advice is so practical and sensible! A great resource!
http://www.scribd.com/doc/11637909/Medicinal-Plants-A-Survival-Guide
Edible and Medicinal Plants, A Survival Guide
In a survival situation, plants can provide food and medicine. Their safe usage requires absolutely positive identification, knowing how to prepare them for eating, and knowing any dangerous properties they might have. Familiarity with botanical structures of plants and information on where they grow will make them easier to locate and identify.