We are located in southern Ontario. I found these seeds in a row (flat sides against each other) in my garden. There is a lot together, so I'm guessing a large pod (its spring so maybe it has degraded and left the seeds behind). They are roundish, and quite flat. I put them on a piece of paper between the lines to see the size. I would say they are 6-7mm.
I am going to clean them up anyway, but want to see if they are worth planting somewhere or if they are invasive and really need to be removed...
Thanks