20 Edible Wild Plants
by Jonas Blake on May.28, 2009, under Life Upgrade
In the spirit of being prepared for anything, from a flat tire to a Zombie Invasion, this is a great list of wild plants that are edible in a pinch, or even just for some fun (and free) variety. They may not all be available in your area, and I think staying away from mushrooms completely might be a good idea, but things like Yucca flowers and lambs quarter can be a great fun addition to your summer menu.
And you never know when you might need to forage for food while hiding from Zombies.
If the link is down, here is the Google cache of the page.
Also, if you want to get way, way more in depth, check out this site.