Trees, 8-20 m tall. Branchlets glabrous, angulate. Stipules inconspicuous; pinnae 1-3 pairs, with a gland near base of petiole and between uppermost pinnae; petiolules ca. 3 mm; leaflets 1-6 pairs, elliptic, oblong, or obliquely obovate, 5-11 × 1.5-6 cm, both surfaces glabrous or puberulent, midvein central, base attenuate to subrounded, apex acute, acuminate, or obtuse, sometimes mucronate. Heads arranged in terminal or axillary panicles. Calyx campanulate, 1.5-3 mm. Corolla funnel-shaped, 6-7 mm; lobes lanceolate, ca. 4 mm. Stamens numerous; tube 3-4 mm. Ovary glabrous. Legume dehiscent, brownish, straight, ligulate, 10-30 × 2-4.5 cm. Seeds 4-9, brown, orbicular, 8-9 mm in diam. Fl. Apr-Jun, fr. Sep-Nov.
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A tall tree. It grows 40 m tall. The crown is dark green. The bark is thin and grey. The leaves are divided with leaflets along the stalk. There are 1-4 pairs of leaflets. These are 5-10 cm long by 2-4 cm wide and the top ones are the largest. The flowers are in groups of 6-10 in heads. The flowers are small. The clusters are at the ends of twigs. The fruit is 10-30 cm long by 3-4 cm wide. There are 2-10 round dark brown seeds.
Evergreen and secondary forests, usually in more open, secondary formations and in thickets; at elevations from 600-1,900 metres.
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It is a tropical plant. In southern China it grows in secondary forests between 600-1,900 m above sea level. In XTBG Yunnan.
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