Tree, scandent in habit, or shrub. Leaves with 4-7 leaflets, these subelliptic, ovate or obovate-oblong, 4-14 cm. long, 1.5-7 cm. wide, long-acuminate, the costa immersed above, the main veins 6-16, stiff-chartaceous to subcoriaceous, equilateral, reticulate, glabrous above, pubescent along the costa below; petioles up to 3.5 cm. long; rachises 3-9.5 cm. long; stipules cuneate, up to 0.7 cm. long, cleft, curved. Panicles axillary or terminal, up to 8 cm. long, the branches often paired, up to 2 cm. long, wiry, sharply ascending, the flowers densely capitate; bracts ovate, up to 3 mm. long; bracteoles orbicular, up to 2 mm. long, the hairs short and rigid. Flowers with the hypanthium 5-6 mm. long, puberulent mostly on the teeth, the latter scarcely discernible, or up to 1 mm. long, very broad at the base; vexillum orbicular, about 7 mm. long, cuneate at the base, the short claw densely puberulent; wing petals falcately oblong, about 8 mm. long, the auricle about 1 mm. long, the lower margin strongly curving, narrower and arcuate near the claw, densely aurous-villose proximally especially below the middle, the claw obviously eccentric; carinal petals subreniform, about 8 mm. long, venose, carnose, densely villose along the lower margin, the claw obviously eccentric; stamens monadelphous or diadelphous, the filaments longer than the sheath, the anthers 0.5-0.6 mm. long; ovary stipitate for about 4 mm., aurous-villose, the style 0.8-1.8 mm. long. Fruits stipitate for about 7 mm., the stipe ferruginous-puberulent, the seminiferous area about 2.5 mm. long, about 1.3 cm. wide, flat, not strongly falcate, the wing cultriform, 4-9 cm. long, 1-2.6 cm. wide, oblique with the ventral margin broadly contracted toward the base, the dorsal margin 1-2 mm. wide, reticulate, glabrous or sparsely villosulose.
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