Trees to 19 m. Branchlets glabrous or puberulent, turning into thorns when old. Leaves 7-15 cm; petiole ca. 3 cm; axis narrowly winged; leaflets 7-9(-11); petiolule 3-4 mm, puberulent; leaflet blade lanceolate to ovate-lanceolate, 1.7-5 × 0.6-1.8 cm, leathery, adaxially glabrous, abaxially pubescent along base of midrib, base cuneate, margin sharply serrate, apex acuminate; primary veins 6 or 7 on each side of midrib. Cymose panicles lateral at branches of previous year, ca. 1.5 cm. Flowers polygamous, congested, fascicled, appearing before leaves. Corolla absent. Staminate flowers with campanulate calyx. Bisexual flower with minute calyx and truncate calyx teeth. Samara spatulate, 4-5 cm × 5-8 mm. Fl. Feb-Mar, fr. Sep.

* Hills; 100-600 m. Hubei