Hi Jennifer-
I tripped over some of our Ohio edibles another way. I wanted to ID the "weeds" on my property, for a few reasons: 1) for those I was sure I wanted to get rid of, I wanted to know how they spread, 2) I wanted to know if the weeds could tell me anything about the conditions in the spots where they were growing, and 3) I realized I had tons of plants on my property that I could not identify, and before I did something to them, I wanted to know about them. (permaculture "observation").
I was surprised at some of the ones that were edible.
I also found that I misidentified some!
That reinforced for me, the rule "get an expert to confirm, before you eat it".
Here are some edibles that are lying around my suburban Ohio property. And importantly--we've been chemical-free in our property for well over 3 years now -- not sure exactly how long...
This list comes with the caveat to you and all, that you should do your own research and check and check again, before you eat any of this stuff!
I am not an expert.
1. Purslane (Often grows in cement and sidewalk cracks. Be sure no one is spraying poisons where you collect!)
2. Common yellow woodsorrel
3. Sweet woodruff
4. Canadian thistle (NO! I have not tried to prep and eat this one, yet!

)
5. Dandelions (I did a pick-and-taste test, and quickly realized that I had waited too long. The problem is, by the time I noticed them, it was too late: didn't like the taste. Still haven't tasted young-enough ones)
6. Crab grass (150,000 seeds produced per plant; evidently can be ground into a flour)
7. Linden tree
8. Pin oak acorns (take a lot of processing)
This is one of the websites I've found helpful:
http://www.eattheweeds.com/
Notable Non-edibles
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Deadly nightshade (green to red berries) - almost everyone knows this one; it's so common. It's the main reason all us kids got the rule of "NEVER eat anything, until you show Mommy the plant."
Poke
-- This is the first year we've had a poke plant on our property. It has colorful drop clusters of berries. References say that every part of it is toxic. And yet, one hears of "poke sallet" being et. I would think the berries would be very tempting to children. Here's the lowdown, and personally, I'm never going to bother trying to ID it as a young plant and prep it:
http://www.eattheweeds.com/can-be-deadly-but-oh-so-delicious-pokeweed-2/ . I only knew I had a poke plant, after it developed berries.
One of my favorite plant ID methods:
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When I think I may have narrowed down the possibilities to a few plants, I change my Google search to "images" and do a search on the plant names I suspect. Although a few of the images in the zillions returned will be incorrect, most will be correct, I'll see the pattern, and know whether I have a match or not.
'Ta for now,
Mariamne