Woody vine. Stems pentagonal, furrowed, hirtous at angles, glabrescent; cross section with a central pentagonal vascular cylinder, usually with a hollow pith, surrounded by 3 smaller peripheral vascular cylinders. Stipules minute, triangular, early deciduous. Leaves biternate; petiole and rachis canaliculate, glabrous or abaxially pubescent, hirtous, petioles unwinged, rachis margined or unwinged; leaflets chartaceous to coriaceous, glabrous, elliptic, elliptic-lanceolate, or ovate, 6.5-11 × 2.8-5.5 cm, the apex acute to acuminate, mucronate, the base attenuate on distal leaflets, obtuse on lateral ones, the margins entire, remotely 1-or 2-dentate toward distal portion, or less often serrate. Thyrses axillary, racemiform or less often paniculate, 12-35 cm long, with canescent-pubescent or puberulent axes; cincinni canescent-pubescent, alternate, elongated, secund, few-flowered; pedicels ca. 4 mm long, articulate near the base. Sepals 5, outer sepals smaller, minutely pubescent, inner sepals tomentulose; petals obovate, ca. 4 mm long; disc 4-lobed, the central lobes oblong, obtuse or acute, pilose at base, the lateral ones much smaller; filaments pilose. Mericarps glabrous, 3-3.5 cm long, the cocci as wide as the wing, slightly swollen, with prominent vein network.
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