Trees, evergreen, 5-15 m tall. Branchlets pubescent when young. Stipules filiform, ca. 2.5 mm, caducous; leaf glands 1-2 cm above base of petiole and rachis between first and second pinnae, elliptic; pinnae 2-4(-6) pairs; leaflets sessile, 6-14 pairs, oblong, 2-3 × 0.7-1.4 cm, papery, both surfaces sparsely appressed pubescent, main vein eccentric, close to upper margin, base obliquely truncate, apex obtuse, sometimes mucronate. Heads arranged in panicles, ferruginous pubescent. Flowers dimorphic, 10-15, sessile, yellowish, fragrant. Calyx cup-shaped, 1-1.5 mm, puberulent to tomentose; teeth shorter than 0.25 mm. Corolla funnel-shaped, 4.5-6.5 mm; lobes lanceolate, 2-2.5 mm. Staminal tube ca. as long as corolla tube. Ovary ferruginous tomentose; stipe ca. 1 mm. Legume oblong, compressed, 10-18 × 2-4 cm, densely pubescent when young, sparsely pubescent when mature. Seeds 6-12, ovate in outline, ca. 9 × 6 mm; pleurogram narrowly ovate. Fl. Apr-Jul, fr. Jun-Oct.
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A tree. The bark is grey with patches. The leaves are alternate. The stalk of the leaf has a black gland near the base. The leaves are 10-20 cm long with 3-8 pairs of pinnae. These are 5-9 cm long and each have 8-20 pairs of leaflets. These leaflets are 1.7-2.5 cm long by 5-10 mm wide. The flower heads are solitary. The flowers are pale yellow. The fruit is a pod 10-30 cm long and 1.7-3.5 cm wide. These are reddish-brown. There are 8-12 seeds.
It is a tropical plant. It is best in well composted, moist, well-drained soil. It needs a protected, sunny position. It is sensitive to drought and frost. In southern China it grows in thin forests from sea level to 1,500 m above sea level.
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Scattered in thin forests from sea level to 1,500 metres. Open areas, dry deciduous forest, secondary forest, fire damaged forest, hill mixed evergreen forest, hardwood forest, at elevations from 400-1,500 metres.
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