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Leaves paripinnate; stipules not seen, probably very early caducous; petiole 1.9–8.5 cm long, glabrous; rachis 9–19 cm long, glabrous; petiolules 2–4 mm long; leaflets opposite to subopposite, in 5–6(8) pairs, 2.5–7.2 × 1.6–3.4 cm, ovate to broadly ovate, somewhat asymmetric, apex acute to rounded, base asymmetrically cuneate, glabrous above, glabrous to sparsely pubescent beneath; venation slightly prominent on both surfaces.
Stamens 10; filaments glabrous, anthers pubescent, 3 stamens with filaments c.16 mm long, sigmoidally curved in the lower third, abruptly swollen above the middle, anthers c.4 mm long; 4 with straight filaments 6–7 mm long, anthers c.4 mm long; 3 with filaments either straight or helically coiled towards the apex, anthers c.1.5 mm long.
Inflorescences of axillary and terminal racemes, held erect or horizontally, often branched; axis glabrous or pubescent; bracts c.6 × 1 mm, linear, puberulous; bracteoles c.2 × 0.5 mm, linear, puberulous; bracts and bracteoles falling well before anthesis; pedicels 2.5–4 cm long.
Pod blackish, 40–44 × 1–1.2 cm, cylindrical, terete, many-seeded; pod wall easily crushed between finger and thumb.
Ovary 16–24 × 1–1.5 mm, linear, pubescent, multiovulate; stigmatic chamber lateral, fringed with hairs.
Calyx lobes 5, 9–11 × 4–6 mm, ovate to elliptic, sparsely appressed-pubescent outside, glabrous inside.
Seed dark brown, shiny, c.6 × 6 × 3 mm, almost circular, flattened, enclosed in pulp.
Petals yellow, 16–20 × 10–14 mm including a 2 mm long claw, obovate-elliptic.
Branchlets brown, longitudinally ridged, glabrous.
Shrub or small tree, 1–4(6) m tall.
