Woody climbers, large, occasionally erect. Branches glabrescent, twining or twisted into spiral hooks; branchlets puberulent, striate. Leaves 7-20 cm; leaflets 9-13, obovate to ovate-elliptic, 2.5-7 × 1.6-3 cm, glabrous, veinlets finely reticulate abaxially, base narrow, apex obtuse and mucronulate. Panicles terminal, rarely axillary, copiously branched, 13.5-30 cm. Flowers 6-8 mm; bracts lanceolate. Calyx campanulate, outside rusty tomentose; teeth 5, lowest one lanceolate, much longer than rest, upper 2 subconnate. Corolla blue to lilac; standard orbicular, reflexed; wings obliquely oblong, clawed; keel boat-shaped, clawed. Stamens 10, diadelphous (5+5), staminal sheath 4.5-5.5 mm; filaments free in upper 1/3. Ovary 4-5 mm, stipitate, pubescent at sutures and stipe, 2-ovuled; style slender; stigma minute. Legume indehiscent, oblong, rarely ovate-oblong, 5-9 × 1.6-2.3 cm, stalked, glabrous, uniformly reticulate, narrowed at base, obtuse to mucronate at apex. Seeds reniform, compressed, ca. 7 × 5 mm. Fl. Jan-May, fr. Mar-Jun.
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