Loose-flower hornbeam is a deciduous tree native to Korea and Japan, grown in U.S. arboreta. Its leaves have long, narrow tips, and its hanging fruit clusters have widely spaced, leaflike parts.
Both have three-lobed fruit bracts. Loose-flower hornbeam has a longer, more drawn-out leaf tip and longer leaf stalks; check several leaves and fruit clusters before deciding.
Why they get mixed upThe two hornbeams have similarly toothed leaves and hanging fruit.