I found a discussion on Pignut Hickory versus Red Hickory, which are the two I narrowed down to be most likely, Carya glabra and Carya ovalis
http://www.nativetreesociety.o...
A conversation about the impossibility of separating the two (link on the above site)
http://groups.google.com/group...
A convenient list with common names..
http://www.discoverlife.org/mp...
