A scandent undershrub; stems slender, pubescent, twining, springing from a woody base, 6-8 ft. long; leaves distinctly petioled, firmly membranous, simple, deeply 3-partite with occasionally a pair of much smaller basal lobes superadded, lobes ovate, acute, their margin shortly serrate, base deep-cordate, 2.5-3.5 in. long, 3-4 in. wide, somewhat polished and very minutely pubescent on both surfaces; petiole pubescent or glabrous, 1-2.5 in. long; stipules lanceolate, spreading, minutely pubescent, 2 in. long; heads peduncled; peduncles minutely pubescent, 1-3 in. long; involucral bracts large, yellowish-green, 1.5 in. long, 1.5-1.75 in. wide, deep-cordate, both rather shallowly 3-lobed; lobes acute, their margin finely toothed; male bracts entire; male calyx glabrous, lobes ovate, acute; female calyx-segments linear-lanceolate, densely pinnately lacinulate on each side, lacinulae slender, glandular, scabrous; ovary puberulous; style columnar, cylindric, entire, not dilated at the tip; capsule nearly glabrous, 0.3 in. across; cocci subglobose; seeds globose.
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