Thanks for the sharing the link. I will check it out more closely as I am into knowing about different wild plants that can provide food or medical care in the woods. But importantly as stated above, you don't want to use something unless you know for a fact the plant is properly identified and is edible or not. I have a few books on this subject and I know a few of these plants by sight, like may-apples and elderberry, mullein and red clover,etc.., but I know others have lots of look-a-likes, that could make you really sick if eaten or used for a herbal cure.
One of my favorite books to read is Stalking The Good Life, by Euell Gibbons
This book is a man's adventure into foraging for survival. He talks about going out on camping trips and getting most or all of his meals from the forests and streams, or rivers. The book has some illustrations of wild plants, and he gives details of his many camping trips and of people he taught the art of finding wild foods and preparing them in such a fashion it makes your mouth water, and you wish he was still alive to teach you. The book is out of print but can be found on-line. He also wrote Stalking the Wild Asparagus and Stalking the Healthful Herbs.
Another book I have is called Backyard Medicine, by Julie Bruton-Seal & Matthew Seal
It tells about how to harvest wild plants and make herbal remedies. It goes into great detail explaining what the plants look like, along with pictures and detailed uses for each plant. Again there are many I know and others I need more instruction on their identification. One way to do this is finding someone who makes their own herbal medications and having them teach you or get advice where to take classes.