Been awesome here and thank you so much, attached pics is a small tree on my daughters place.

I always guess Ash first.

AAGH! TOO CLOSE! My eyes are burning!

Could you back up and take a photo of the entire tree or at least some branches? Thank you!

I'm certain that's a Hickory (Carya sp.).

I agree that you should show the WHOLE plant first, then progressively detailed images. Always show how the leaves are attached to the stem/branch, which will always help separate similar species.

Hickory will have alternate arrangement of pinnate compound leaves; Ash will have opposite arrangement of pinnate compound leaves.

I have no advice for burning eyes - other than it means lots of tree pollen aggravating me here in the Ohio River valley...

I agree with Carya.

They sure look like leaves of Carya sp. to me too and there are apparently quite a few Carya that grow in Illinois, as listed on this page: http://m.extension.illinois.ed...

For comparison: Shagbark Hickory (Carya ovata)