Tuber enlarged. Stem and branchlets slender, sulcate. Leaves pedately 3-5-foliolate; petiole 2-5 cm; leaflets ovate-lanceolate; median leaflets 9-15 × 4-5 cm; petiolule 3-5 cm. Male flowers sparsely dichotomously cymose; peduncle 10-12 cm; calyx segments lanceolate, ca. 10 × 3 mm, apex reflexed; corolla pale yellow-green, lantern-shaped, 9-11 mm; segments broadly ovate-lanceolate, 10-15 × 6-10 mm, apex reflexed; filaments ca. 1 mm. Female flowers: corolla larger than male flowers, 12-15 mm in diam.; ovary ovoid, ca. 10 × 5 mm. Fruit ellipsoid, 3.5-4 × ca. 2.5 cm, base obtuse-rounded; fruit wall leathery. Seeds almost circular, compressed, ca. 15 mm in diam., ca. 3 mm thick, unwinged, margin 3-4 mm wide. Fl. Jul-Sep, fr. Sep-Nov.
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