Small tree 1–3 m. high, with rather stout simple or only slightly branched stems; epidermis probably ultimately flaking away to expose inner bark whose colour is uncertain. Stipules spinescent, mostly 1.5–3.2 cm. long, straight or nearly so, whitish at first, soon blackish, some fused at base into ± rounded “ant-galls” 1.2–3 cm. in diameter. Leaves glabrous, or the rhachides and sometimes the leaflets subglabrous; petiole 4–6 mm. long; rhachis (1.4–)10–27 cm. long; pinnae of well-developed leaves of mature shoots 15–28 (or? more) pairs (reduced leaves with fewer pairs usually also present), 3–8.5 cm. long; leaflets 21–49 pairs, 3–7 mm. long, 0.75–1.4 mm. wide, acute at apex. Flowers cream, in heads; involucel at base of the rather stout, 1.25–3 mm. thick peduncle. Calyx 2.5–2.7 mm. long. Corolla 4.5–5.5 mm. long. Pods falcate, glabrous to puberulous, mostly 6–10 cm. long, 0.3–0.5 cm. wide.
