Aceraceae -- comments
The genera: Acer (maple) is common to both the Old and New Worlds. The other, Dipteronia, occurs only in China.
Notes: Acer is the source of maple syrup and many species are valuable timber trees and their wood are used to make furniture. Also used as street and other landscaping trees/shrubs.
In the field, the opposite, palmately-veined, simple leaves (except things like A. negundo), opposite branching, and the two-winged samaroid schizocarps should diagnose the family.