Trees small, deciduous, andromonoecious. Winter buds naked, ovoid, small. Leaves imparipinnate. Inflorescence terminal or axillary, paniculate branching ending in cincinni. Sepals 5, ovate or elliptic. Petals 5, reniform. Disk extrastaminal, rarely marked by depressions or pits. Staminate flowers: stamens 8. Bisexual flowers, but functionally male or female: ovary 2-loculed. Fruit of 2 compressed nutlets, flat, encircled by a broad wing.

● Two species: China.