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All known wild edibles in N. America? That's a tall order! You'd be best off buying or borrowing a good guide book on the subject. There are many excellent books out there, but I would reccomend Samuel Thayer's work. He's written two great ones: The Forager's Harvest, and Nature's Garden.
I agree with where John G's going with this, but I would say you need several books on the subject, including a couple of good ones on poisonous plants.
The reason? One example - I have one book that says the berries of Virginia Creeper (Parthenocissus quinquefolia ) are poisonous and another that says they're edible.
Learning wild foods can be really interesting and rewarding - take the time to do it right. Be sure of anything you're going to put in your mouth.
THE FINAL RESPONSIBILITY FOR DETERMINING THE SAFETY AND SUITABILITY OF USING ANY WILD PLANT AS A FOOD OR MEDICINE IS YOURS. IN OTHER WORDS, YOU TRY IT, YOU GET SICK -------IT'S YOUR FAULT!
Doc (leaving his soapbox).
My education continues. :thumbup: