Annual vines; stem puberulent to glabrate. Leaves 3-foliolate, lateral leaflets 3-to 7-times dissected, blade suborbicular, 3.5-15.0 cm long, 4.5-20.0 cm wide, the leaflets or ultimate divisions elliptic, the margins coarsely serrate dentate, the apex acute, membranaceous, the upper and lower surfaces scabrellous to glabrate; petiole 2-4 cm long, slender, glabrate; tendrils 3-to 5-branched. Staminate flowers axillary, elongate paniculate; rachis 15-30 cm long, slender, flowering along most of its length; pedicels 1-3 mm long, filiform; calyx shallowly cupulate, 0.8-2.5 mm in diameter, greenish white, the sepals obscure; corolla 2.0-3.5 mm in diameter, greenish white, lobes ca. 1 mm long, broadly lanceolate, the outer surface glabrous, the inner surface papillate, 3-nerved; androecial head sessile, ca. 1 mm in diameter. Pistillate flowers solitary, in the same axils as the staminate flowers; peduncle 0.5-2.0 cm long; calyx and corolla as in the staminate flowers but slightly smaller; ovary obliquely ovoid, rostrate, ca. 8 mm long, setose; stigma subglobose. Fruits greenish white, obliquely ovoid, 3-4 cm long, explosively dehiscent, seta 5-7 mm long; seeds grayish brown, ovoid, compressed, 8-13 mm long, the margin irregularly appendaged.
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