Hi dbjmar,
Can you give us a general location of the part of the country the tree is growing? That would help with a more exact identification. It reminds me of Ulmus/Elm: http://garden.org/plants/searc... but I'm not certain. There are seedling images at this page for comparison: http://designingbonsai.com/elm...
~ I'm an old gal who still loves playing in the dirt!
~ Playing in the dirt is my therapy ... and I'm in therapy a lot!