Trees, deciduous. Young branches densely covered with resinous glands and pubescence. Winter buds naked, shortly stalked. Stipules caducous. Leaves alternate, odd-pinnately compound; leaflets alternate, sessile, margin serrate. Inflorescences polygamous, axillary in distal leaves, paniculiform, fascicled from many spikes; flower clusters alternate, usually a simple dichasium with bisexual flower in middle and sterile female flowers laterally. Flowers actinomorphic. Tepals 4, free. Bisexual flowers: stamens 6; filament slender, erect; anther with little glands, apically slightly foveolate, longitudinally dehiscent; connective very narrow; pistil 1; ovary superior, covered with glands, 2-loculed but only 1 developing, with 1 campylotropous ovule; stigmas free. Female flowers: sterile; pistil small; staminodes absent. Nutlets developed only from bisexual flowers, slightly compressed, with persistent tepals at base and persistent stigma at apex; exocarp papery; wings 2. Seeds without endosperm; embryo erect.

One species: China, Vietnam.

(Authors: Fu Liguo (傅立国 Fu Li-kuo) , Xin Yiqun (辛益群) ; Bruce Bartholomew)