Small tree 4–7.5 m. high. Young branchlets brown or grey-brown, longitudinally ridged and very sparsely puberulous when young, soon glabrous. Stipules spinescent, short, straight, slender, suberect, to about 4 mm. long (on mature shoots), not enlarged or fusiform; no prickles below the stipules. Leaves: petiole (1.5–)2–3 cm. long; rhachis sparsely puberulous, eglandular, 5–9 cm. long; pinnae 6–14 pairs; leaflets 12–35 pairs, 2.5–7.5 mm. long, 0.6–1.5 mm. wide, rounded to subacute at apex, glabrous unless for a few very inconspicuous appressed cilia; lateral nerves invisible; surface of leaflets paler beneath than above. Flowers sessile, in very short spikes or ellipsoid heads 1–1.5 cm. long, on usually long (4–7.5 cm., to 9 cm. in fruit) peduncles which are puberulous and with some sessile glands above. Calyx 0.5–1 mm. long, glabrous. Corolla 3.75–4 mm. long, glabrous, with 4 lobes about 1 mm. long. Stamen-filaments about 7 mm. long, free or irregularly connate (not tubular) near base; anthers about 0.1 mm. across, with a caducous gland. Pods purplish-brown, dehiscent, almost or quite glabrous, oblong, straight or very slightly falcate, ± reticulate-venose, flattened, rounded or acute at apex, stipitate at base, 5.5–10 cm. long, 1.3–1.9 cm. wide. Seeds ± elliptic, somewhat compressed, olive-green, 5.5–6 mm. long, 4–5 mm. wide; central areole small, 2.5 × 1–1.25 mm. Fig. 18.
