Monoecious tendriled vines; stems 5-to 10-sulcate. Leaves petiolate, simple or foliolate; tendrils mostly 4-branched. Staminate flowers solitary in the axils of the leaves, long pedunculate; calyx funnelform or narrowly campanulate, 5-lobate; corolla white, 5-lobate, spreading; stamens 3, inserted on the calyx tube wall, the filaments free, slender, the anthers longitudinally triplicate, connate, one anther unilocular, the other anthers bilocular. Pistillate flowers solitary, aris-ing from separate or the same axils as the staminate flowers, short pedunculate; calyx as in the staminate flowers, but shorter; corolla as in the staminate flowers; ovary ellipsoid to globose, 3-carpellate, the styles solitary, slender, the stigmas 3, bilobate. Fruit ellipsoidal or oblong, the dry, thin pericarp splitting from the apex and revealing tiers of horizontal cavities, each containing a single seed; seeds numerous, dull brown, horizontal, broadly ovate, compressed, slightly roughened.
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