Vine; branchlets glabrous; pseudostipules lacking. Leaves: petiole thin, 2.5-5 cm long; blade 3-lobed, 5-9 x 7-11 cm, glabrous, shining above, greyish with very fine indument beneath, apex rounded, base truncate, sometimes slightly cordate, lateral lobes perpendicular to the middle lobe, middle lobe 3-6 cm long; venation pedate, marginal at base. Flowers axillary, solitary; pedicel 2.5-4 cm long; ovary about 1.5 cm long; perianth sparsely pilose to glabrous; utricle ovoid, 1.0-1.5 x 0.8-1.2 cm; tube about 1.5 cm long; limb funnel-shaped, superior lobe rounded, triangular, up to 3.5 x 3 cm, apex emarginate. Fruit small, 3.5 cm long, acumen 5 mm long, pericarp membranous, glabrous; seeds 2 mm long.
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