Liana to 10 m long. Stems terete, minutely sericeous-pubescent, lenticellate; cross section with a single vascular cylinder. Stipules inconspicuous, early deciduous. Leaves pinnately 5-foliolate; petioles unwinged, glabrous, 1-5 cm long; rachis narrowly winged or margined, glabrous, 1-1.8 cm long; leaflets chartaceous, glabrous except for the minute hair domatia at the secondary vein axils on abaxial surface, elliptic, oblong, or rarely lanceolate, 1.8-7 × 1.7-3.5 cm, the base decurrent on distal leaflet, obtuse on laterals, and obtuse to truncate on lower ones, the apex caudate, margins sinuate, the basal leaflets bidentate at base; tertiary veins finely reticulate. Thyrses axillary, racemiform, solitary, the axes ferruginous-tomentulose; cincinni sessile, few-flowered; bracts and bracteoles minute, deltate. Pedicels 1.5-2 mm long, articulate around the middle, ferruginous-tomentulose. Calyx sparsely, appressed-pubescent, sepals 5, concave, with ciliate, ciliate-glandular margins, the outer ones ca. 1.5 mm long, ovate to rounded, the inner ones 3-4 mm long; petals oblong, rounded at apex, shortly clawed at base, ca. 3 mm long, adaxially papillate; appendages as long as the petals, central appendages with 2 corniform projections at apex, lateral ones with 1 corniform projection, these ca. 1.7 mm long; nectary with 2 deltate, pubescent lobes, ca. 1 mm tall; filaments of unequal lengths, 2-4 mm long, pubescent on lower half; anthers ellipsoid, ca. 1 mm long; gynoecium ferruginous-tomentulose, clavate, with three stigmatic branches. Capsule (immature) unwinged, long-stipitate, smooth, nearly globose, seemingly coriaceous.
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