I'm leaning towards Betula (Birch) as bamira referred to earlier but it's just a guess on my part because I'm not good at identifying or comparing photos. It's been a long time since I've been in the Northeast but there are a couple of Birches that are native to that area of the U.S. and the leaves just reminded me of birch for some reason.
For comparison, scroll down these pages and enlarge the leaf images:
B. nigra:
https://en.wikipedia.org/wiki/...
B. lenta:
https://en.wikipedia.org/wiki/...
B. pendula, autumn foliage:
https://en.wikipedia.org/wiki/...
http://mobile.floridata.com/Pl...
When googling, I found this list of native plant list of Maryland, Va. & West Va.:
http://www.plantnative.org/rpl... that might be of help.
