Polk is a native weed commonly eaten from Mississippi to Oklahoma, you can find it canned some places in a grocery shelf but seems very regional. Fresh is the best. Some people cannot tell it from Spinach. There was even a song in the 60s called "poke salad Annie". Dock is a plant that grows next to the creek and is what you would call a pot green like turnip greens. Optima is cactus fruit, It is found wild here and it is in the grocery store but it is less common here than in West Texas. Sandplum is a sour fruit from a plant that is often used as hedges here but can be found all over the place here. Squaw bread is a heavy slightly sweet muti-grain black bread.
The fields here are almost a grocery store if you know what things are. This is a wild guess but I bet there are probably 40 different edible plants the grow wild here. Black berries, walnut, pecan, currants, water cress, purslane, rock cress, Jeruselem artichoke, at least four kinds of wild grapes, wild onions (about the size of a large grape) and so on.