Carya ovata gets its common name from this flaking bark. It curls away from the trunk at the ends, but stays attached to the tree in the middle, giving the trunk a shaggy look.
The leaves are pinnately compound with 5 or 7 leaflets on each leaf. Here's a closeup of a leaflet.
The nuts are tasty - at least, the squirrel who was gnawing away at the middle fruit thought so (click on the photo to see). When the fruit is ripe, it separates along the four grooves, leaving lots of husk pieces around the tree like the one on the right.