Slender, twining vine; stems wiry, puberulent, glabrescent. Leaves simple, hastate to deltate, the blades mostly 9-15 cm long, apically acute or acuminate, the basal lobes oblique and obtuse, glabrate, with puberulence on the midvein above; petiolule wrinkled, pilose, 3-4 mm long; petiole shorter than the blade, the conspicuous wing 2-9 mm wide, gradually tapering to the base; stipels sub-ulate, 2-nerved, about as long as the petiolules; stipules narrow, acute, promi-nently nervate, ca. 6 mm long. Inflorescences congested few flowered racemes, peduncle slender, mostly 1-2 cm long, becoming somewhat stout in fruit; bracts resembling the stipules, caducous, bracteoles 2, spathaceous, conspicuously ner-vate, to ca. 10 mm long. Flowers showy, mostly white, with some purple; calyx cupular, pubescent, the teeth subulate, ca. 5 mm long; standard orbicular, nearly flat, emarginate, ca. 5 cm long. Legume linear, flat, 12-18 cm long including the acicular beak, the beak 5-10 mm long, the margins evident, narrow, minutely puberulent overall, glabrescent; seeds plump, dark brown, ca. 5 mm long, the hilum along one edge.
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