Chinese buttonbush is a deciduous shrub native to China and Korea, with small white to pale pink flowers clustered into round heads. In the United States, it is occasionally grown in gardens.
Both have white, round flower heads. Native buttonbush usually has much larger leaves, about 4–6 in (10–15 cm) long, while Chinese buttonbush leaves are about 1–2 in (2.5–5 cm) long.
Why they get mixed upBoth grow by water and have round flower heads.