Beginner Gardening: Mystery Tree in Southern Michigan, 1 by aquilusdomini

aquilusdomini wrote:
This tree is a bit of a mystery, it grows amongst Box Elders, Maples, Elms, and Mulberries. It's origin is a bit baffling too, we believe it may be a Walnut tree, but we're doubting it because the nearest walnut tree is all the way down the street but it is possible i suppose (thanks to squirrels). The leaves are huge about 4-5 inches long, it's branches are oddly twiggy and it grows straight up (no twists, no turns, no knots). The bark is greyish and doesn't appear thick though this tree does still look quite young, so perhaps that's why the bark isn't thick looking. I'm sending along 3 other pictures to help in the identification process...

if anyone knows that type of tree this is, i'd appreciate your help :)