Vines. Stems slender, twining, glabrous or almost glabrous except for nodes. Leaves pinnately 5-or 7-foliolate, 15-20 cm; stipules deciduous, triangular, ca. 4 mm, pilose; petiole 2.5-5.5 cm, glabrous; stipels deciduous; petiolules ca. 2 mm, hirsute; leaflets lanceolate to ovate-lanceolate, ca. 5.5 × 2.2-3.2 cm, papery, both surfaces glabrous, lateral veins ca. 5 on each side, slender, base broadly cuneate to almost rounded, apex acuminate, mucronate. Raceme longer than leaves, pedunculate, with 2 flowers per node. Upper lip of calyx entire, ovate-orbicular, apex mucronate, lateral lobes obliquely lanceolate, apex acuminate, bottom lobe ovate. Corolla yellow or light green; standard 1.7-2 cm; wings almost half as long as standard; keels longest, curved into semicircle. Ovary stipitate, pilose, 8-ovuled. Legume ca. 15 × 0.7 cm, beltlike, compressed, sparsely shortly villous. Fl. Aug-Sep, fr. Sep-Oct.
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