Climbers, woody. Branchlets densely ferruginous glandu­lar hairy, with recurved prickles. Leaves 22-36 cm; pinnae opposite, 13-23 pairs, ca. 3.5 cm; leaflets opposite, 7-14 pairs, oblong, ca. 9 × 4 mm, abaxially and marginally with bristles. Racemes terminal, lax. Flowers large, more than 50 per inflo­rescence; pedicels unequal in length, 1.5-2 cm in upper part and 3-3.5 cm in lower part of inflorescence. Sepals 5, ca. 10 × 8 mm. Petals bright yellow, suborbicular, upper one smaller, ca. 8 mm wide, others larger, ca. 1.7 × 1.3 cm. Stamens 10; fila­ments ca. 1.8 cm, densely cottony in lower part. Ovary ca. 5 mm, densely hairy, 1- or 2-ovuled; style 1.4-1.5 cm, pilose; stigma truncate. Legume obovoid, falcate, 4-5 × ca. 2.5 cm, setose, dehiscent. Seeds 1 or 2, oblong. Fl. Nov-Dec, fr. Feb-Mar.

Among bushes, near roads; 600-700 m. Yunnan (Xishuangbanna) [Bangladesh, India, Laos, Myanmar, Thailand, Vietnam].