Twining vine climbing on shrubs and trees, stems mostly puberulent with curved brownish hairs. Leaves pinnate trifoliolate; leaflets mostly 10-12 cm long, 5-8 cm wide, ovate or obovate, the lateral leaflets oblique, apically acuminate, basally obtuse or rounded, drying discolorous, pubescent along the veins and margin on both sides, mostly copiously pubescent on the lamina, especially be-neath; petiolules and petioles mostly densely pubescent. Inflorescence mostly 12-20 cm long; bracteoles ca. 2 mm long, often wider, pointed or rounded, mostly tomentose; pedicels obsolete or to 3 mm long. Flowers blue, purplish, or pink; calyx 17-20 mm long, often drying mottled, campanulate, the upper lip as long as or longer than the tube, prominently umbonate or not, sometimes slightly emarginate, glabrate to tomentose, the lowest tooth narrow, 2.5-4.5 mm long, longer than the deltoid lateral teeth; standard ca. 3.5 cm long, often drying brown-ish and striate. Legume mostly 14-17 cm long, ca. 2.5 cm wide, oblong, some-times slightly expanded apically, the beak short and hardly downturned, stipe evident or not, longitudinally ridged at the sutures and with 1 additional ridge 5-10 mm from the sutures, long shaggy pilose when immature, at maturity evenly pilose with soft erect hairs; seeds 12-17 mm long, elliptical discoid, light brown, mottled, the hilum short, 6-7 mm long.
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