Tuber oblate-ovoid. Stem and branchlets slightly stout, distinctly sulcate. Tendrils 12-25 cm. Leaves pedately 5-7-foliolate; petiole 3-6 cm; leaflets lanceolate to obovate-lanceolate, margin crenate; median leaflets ca. 14 × 1.5-4 cm; petiolule 5-10 mm. Male inflorescence dichotomously cymose; peduncle flexuous, 5-12 cm, densely pubescent; calyx segments ovate-triangular, ca. 5 × 3 mm, apex reflexed; corolla pale yellow-green, bowl-like, ca. 10 mm in diam.; segments oblong, 7-8 × 3-4 mm; filaments ca. 1 mm. Female flowers unknown. Fruit clavate or clavate-elliptic, 7-8 × 2-2.5 cm, distinctly costate; fruiting pedicel 10-15 mm. Seeds dark brown, elliptic, ca. 12 × 7 mm, almost unwinged, margin 1-3 mm wide. Fl. Jul-Oct, fr. Sep-Nov.
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