American Bladdernut

large shrub or small tree that is fairly common in rich bottomland forests, especially along streams. The three-parted, opposite, toothed leaves are distinctive. Hoptree (Ptelea trifoliata) also has trifoliate leaves, but the leaves are alternate and it's a rare shrub of drier areas. Boxelder (Acer negundo) is much larger and has more coarsely toothed leaves.