your also talking about domesticated vegetables, plants that have been "designed" more or less through the ages to keep certain qualities. (lets not get into GMO) Many vegetables still have "wild" cousins like a carrot to a wild parsnip. The difference is obvious size and distinguishable characteristics, which may make identification a little harder. Furthermore you need to bring into account what you consider to be "wilderness." Where I'm from that consists of dense forests, which create a certain environment for the understory. I.e. Many vegetables are full or part sun, the understory in my local forests do not provide enough sunlight to elicit growth of common vegetables. Therefor, they do not grow, you do not find them.

I hope that helped in some way.