Perennial herbs, voluble or clambering; stems leafy, the lowermost becoming more or less suberous in age, much branched above, 1-3 mm in diameter, the in-ternodes 6-26 cm long, glabrous or sparsely spreading-pilosulous. Leaves cauline, petiolate, undivided or ternate, ovate-cordate, apically short-or long-acuminate to acute, sometimes mucronate, 4.5-18.0 cm long, serrate to dentate, repand to entire, glabrous or scattered-pilosulous above, glabrous beneath; blades of the un-divided leaves 3.2-11.0 cm long, 2.0-8.8 cm wide, the terminal lobe of the divided leaves ovate to ovate-oblong, 2.2-11.0 cm long, 0.9-6.3 cm wide, the lateral lobes smaller, often somewhat oblique; petioles 1.3-10.2 cm long. Inflorescences ag-gregate dichasia, 12-40 cm long, glabrous or sometimes densely pilosulous; bracts 1.7-2.5 cm long, glabrous or sometimes densely pilosulous. Flowers white, gynodioecious; calyx limb 11-15-fid; corolla more or less campanulate-infundibuli-form, the perfect flowers 1.0-2.3 mm long, the pistillate flowers 0.5-1.0 mm long, glabrous without, the lobes less than half the length of the gibbous tube, the throat scattered-pilosulous or glabrous within; stamens and style exserted. Achenes ob-long-linear to oval, subfabriliform (bellows shape), with 2 relatively prominent subperipheral and 1 median abaxial vein, 1.9-3.1 mm long, 1-2 mm wide, smooth, tawny to brownish, sparsely pilosulous on the adaxial side, glabrous on the abaxial side.
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