Woody vine ca. 8 m long. Stems terete, striate, puberulent or pubescent, becoming glabrous and lenticellate with age, producing milky sap; cross section with a single vascular cylinder. Stipules subulate 5-6 (20) mm long, deciduous. Leaves pinnately 5-foliolate; petioles unwinged, bi-canaliculate, ferruginous-tomentulose, 4-15 cm long; rachis unwinged, bi-canaliculate to narrowly winged, 2.5-6.5 cm long; leaflets chartaceous to coriaceous, glabrous, sometimes abaxially strigose along mid-veins, elliptic or oblong-elliptic, 6-17 × 2.2-8 cm (distal leaflet larger), the base obtuse or acute, the apex obtusely acuminate, the margins remotely crenate-serrate; tertiary veins reticulate; petiolules 3-7 mm long. Thyrses axillary, racemiform, tomentulose, 10-15 cm long; bracts and bracteoles deltate, minute; cincinni sessile, few-flowered. Sepals 4, tomentulose, outer sepals ca. 1 mm long; inner sepals ca. 2.5 mm long, anterior sepal entire. Capsule puberulent, ca. 2 cm long, clavate, with 3 spreading, narrow wings near the apex, these 1-1.2 cm long, the stipe ca. 6 mm long. Seed ovoid, ca. 1 cm long, dark brown, sarcotesta white, on lower half, with subfimbriate margins.
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