I concur with Doug and MDinana.

These types of questions being asked are too general....In my own area, there are 4 very distinct ecosystems and they do not all share the same species of plants let alone edible plants. For example, off the top of my head, I can list more then 40 edible plants that can grow in any of the 4 ecosystems, yet these plants are only good for eating in certain seasons, different terrain such as valleys, alpine meadows, original growth forest, 2nd growth forest, river bottoms and benches...the list goes on.

Some that I have tried and in no certain order:

Berries of all types
Fireweed
Wild grapes
Wild onion
Milkweed
Dandelions
balsam roots
Cat tails
Bracken fern
Various lichens
Seaweeds
Chicory
Juniper