Trees, deciduous, usually more than 10 m tall, sometimes up to 30 m. Leaves 15-40 cm; leaflets 5-12 pairs, 2-8 × 1.2-3.3 cm, both surfaces pilose or abaxially pilose, adaxially sparsely puberulent, base slightly asymmetric, apex acute, obtuse, or shortly acuminate.

Inflorescences lateral on short side branches or terminal on young leafy shoots. Sepals ovate or broadly lan­ceolate. Petals deep yellow or pink, 2.5-4.5 × 1-2 cm. Stamens 10, among them 3 abaxial antesepalous with filaments longer than other 7. Ovary pubescent. Legume terete, 30-50 × 0.2-1.5 cm, with annular nodes.