Poison sumac is not usually found in Athens County. It does prefer marshy areas as you have described, but usually in well developed native marsh lands in the northern part of the state. Both ash and poison sumac have compound leaves. The poison sumac has a red midrib that the leaflets are attached to. The easiest difference is to look at how the compound leaves are arranged along the branch. The ash tree has leaves that are opposite each other while the poison sumac are alternating. (Do not be confused by the leaflets. They are arranged opposite each other on both plants). If you would like to submit a picture, send it to <personal data hidden>

Glad to help.