Herbaceous vines with huge tuberous roots, glabrous except for flowers. Branches ± brown when dry, longitudinally sulcate. Petiole 5-11 cm; leaf blade broadly ovate-rotund, 8-13 × 8-11 cm, subpapery, purplish brown when dry, base cordate or subtruncate, margin horned or horned dentate, apex mucronate or subacuminate, sometimes apiculate, palmately 9-11-veined, conspicuous on both surfaces. Male inflorescences compound umbelliform cymes, axillary; peduncle 2-4 cm; umbellet pedicels 4 or 5, 0.6-2 cm, usually without bract and bracteole, rarely with a linear bracteole on flowering pedicel; flowering pedicel 2-5 mm. Male flowers: sepals 6, subcuneate, with long claw ca. 3 × 1.5 mm, abaxially with transparent papillary hairs; petals 3, broadly cuneate, ca. 1.4 mm long and wide, with tuberculate processes inside; synandrium with a slender stipe ca. 0.7 mm. Female flowers and fruits unknown. Fl. May.
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