Tree (1.5–)6–18 m. high; branches spreading; bark rough, reticulate. Young branchlets glabrous or nearly so, or very shortly pubescent. Leaves: rhachis glabrous or subglabrous; pinnae (1–)2–3(–4) pairs; leaflets 4–8 (–9) pairs, oblique, ovate to rhombic-ovate or elliptic-oblong (15–)23–50 (–63) mm. long, (7–)11–25(–41) mm. wide, rounded or slightly emarginate at apex, glabrous, papery to subcoriaceous, venose, very glaucous beneath. Flowers greenish-yellow, ochre when over, with whitish filaments; flowers sessile or up to 2 mm. pedicellate; bracteoles already fallen by flowering time, minute, up to 1.7 mm. long. Calyx (3–)3.5–5.5 mm. long, rather densely puberulous or minutely pubescent outside, not slit unilaterally. Corolla (5–)5.5–11 mm. long, densely minutely appressed-pubescent outside. Staminal tube not or scarcely exserted beyond corolla; filaments about 1.5–3 cm. long. Pod oblong, 12–23 cm. long, 2.7–4.4 cm. wide, glabrous except for some hairs near base and near margins, slightly venose, ± transversely plicate, thin, usually pale brown. Seeds about 7–9 mm. in diameter, flattened.