Growing like crazy in all the meadows on this side of the park: bad news.
Farmer? i.e. O. agricola...
Feeding on trail under trees.
Feeding on Black berries.
Common tree along City streets. The leafs are about 2" long. Kids call it the helicopter tree because of the way the seeds fall.
I was on a hiking path and there was a medium sized tree with these buds on its branches, a few were opening and leaves were unfurling.