Tree up to 10 m high; all young parts densely pubescent. Leaves with 5-7 pairs of leaflets; stipules narrow-lanceolate, pointed towards both ends, attached in the middle; petiole 2-4 cm long, light brownish pubescent as the 15-40 cm long rachis. Leaflets oblong to oblanceolate, 6-8 by 1.5-3 cm, rounded at both ends; apex with a small mucro, both sides more or less densely velvety hairy; petiolule 2 mm. Racemes lateral, 5-12 cm long, 1-few together; main axis yellowish pubescent; bracts lanceolate, apex long-pointed, hairy on both sides, 7-12 by 3 mm at base; bracteoles similar but only 1/3 the length. Flowers large (the largest flowers of any Cassia in the region), on a 6 cm long, thinly pubescent pedicel, more densely hairy in a ring just below the calyx. Sepals ovate-lanceolate with acute apex, 9-12 by 2-3 mm, hairy on both sides. Petals ovate lanceolate, pinkish, 3.5-4.5 by 1-2.5 cm, claw narrow, c. 5 mm long. Stamens: 3 long with filaments 3.5-5 cm, swollen in the middle, anthers 5 mm long, ovoid, opening by apical and basal slits; 4 with filaments half the length but with anthers nearly twice as long, also opening by slits; reduced stamens 3, small, with filaments 1-1.5 cm long and very small anthers. Ovary whitish pubescent, recurved, c. 4 cm long, on a 1-1.5 cm long stipe; stigma subapical, punctiform. Pods pendulous, terete, grey to brownish velvety pubescent, 30-40 by 1-1.5 cm diam. Seeds 30-40, separated by spongy septa.
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A broadleaf evergreen tree. It grows 7-10 m tall. The leaves are large and compound with leaflets along the stalk. There are 5-7 pairs of leaflets. these are oblong with round tips and are 5-8 cm long. The flowers are pink to purple. The stamen are yellow. There are in long drooping stalks with 20-40 flowers in a group. The fruit are bean like pods. These are 40 cm long and have 30-40 seeds.