Toot! Toot! Tooot!

Ye gads, where to start...

Favorites foods would be greenbriar, saw palmetto, dollar weed, purslane, and mulberries.

Usefulness would be hibiscus, yucca, willow, and American Beautyberry.

Best all-around website for learning about edible wild plants:
Merriwether's Guide to Edible Wild Plants
This easy-to-use, picture-filled site lists seventy common edible plants, where/when to find them, how to prepare them, non-food uses of plants (cordage, bug repellent, etc), any dangers you need to be aware of, gives a list of useful books/references (including strengths and weaknesses of said references), and gives links to all the other edible wild plant sites on the web.

And it's all free!

-Blast, blowing his own horn.