Stems striate, glabrous or pubescent at nodes. Petiole 3-4 cm, pubescent; leaf blade 3-5-foliolate; leaflets sessile; median leaflet abaxially pale green, lanceolate, 15-23 × 2-4 cm, membranous or thinly papery, abaxially glabrous, adaxially hispidulous or white punctate, base cuneate, margin entire, apex acuminate. Male raceme 11-26 cm; peduncle striate, pubescent, 5-15-flowered; bracts rhombic, 7-10 × ca. 5 mm, pubescent, margin crenate, apex obtuse; calyx tube narrowly funnelform, ca. 3 × 0.7 cm, densely pubescent; segments linear-lanceolate, (3-)5-8 × ca. 3 mm, pubescent, margin entire, apex acuminate. Female flowers unknown. Fruit oblong, ca. 6 × 4 cm, smooth, apex acute. Seeds brown, ovoid-oblong, tumid, 12-15 × 8-10 mm, base rounded. Fl. Aug-Sep, fr. Oct-Nov.
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