It looks like Eastern red cedar (Juniperus virginiana) that has been turned into a bonsai via repeated mowing.
If you break a piece off and smell it you should be able to tell. If it is cedar you will clearly smell pine - if it isn't strongly fragrant it is probably not cedar.
I think i found it. Iris pseudacorus (yellow flag iris). I have a few small Iris in my garden but have never seen the seeds, I am guessing something brought the pod near the bird feeder and left me with a puzzle. thanks anyways to those who read the post.
I do not know your flora, but it seems Capsella bursa-pastoris, from Brassicaceae (cabbage/mustard family). Note: there can be more similar species in your region, but usually similar.
You may recognize it with heart-shaped fruits. Note: heart has not the heart-shape, so in past they say it has shape of a shepherd bag (or better flask). You may see many of ...