Dioecious tree to c. 17 m high, deciduous, very widespreading; trunk becoming stout and gnarled. Shoots glaucous, glabrous. Lvs compound; leaflets 3-5-(7); petioles to 12 cm long. Leaflets very variable in shape and size, petiolulate or sessile; terminal leaflet usually to 15 × 8 cm, ovate; lateral leaflets often lanceolate-ovate, remaining hairy on veins below and sometimes on midrib above, coarsely crenate-serrate, sometimes lobulate; apex acute to acuminate. Fls appearing before lvs. ♂ infl. corymbose; pedicels long, filamentous, hairy, pendulous, pinkish. Sepals and petals 0.5-1 mm long, hairy or nearly glabrous. Stamens prominently exserted; filaments very short; anthers 2-4 mm long. ♀ infl. a pendulous raceme; pedicels very slender. Samara wings c. 2.5 cm long, broad, ± incurved, diverging at an acute angle. Seed c. 1.5 cm long, narrow.