Scrambler or vine to 4 m long, glabrous or pubescent. Leaves shortly petiolate, acuminate, ovate to lanceolate, dentate; lamina 4-15 cm long, 20-60 mm wide. Flowers in few-flowered, axillary cymes; peduncle to 16 mm long; bracteoles deltoid, mostly to 1 mm long; pedicel to 5 mm long, articulate below ovary. Sepals linear, to 5 mm long, free. Corolla 14-20 mm long, glabrous outside, densely bearded inside, yellow; wings to 1.5 mm wide. Fruit narrowly obovoid, 10-12 mm long, grooved, glabrous or with scattered hairs, black.
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