Shrub.. Stems glabrous or very nearly so, very sparingly armed with upcurved prickles about 2.5 mm. long.. Leaves: petiole 0.7–2.1 cm. long, unarmed; rhachis 6.5–18(–20 fide Drake) cm. long, armed with many brown upcurved prickles whose bases are compressed and broadly triangular; no prickles on rhachis at junction of each of the 4–20 pairs of pinnae; leaflets 4–7 pairs, shortly oblong to obovate-oblong, 5–11 mm. long, 2.5–5.5 mm. wide, rounded at apex, appressed, puberulous both sides, not setulose, venation (other than midrib and basal nerves) not visible beneath.. Flower-heads subglobose, about 0.7–0.9 cm. in diameter, ± racemosely arranged, 1–2 together from axils, on unarmed almost glabrous peduncles 4–7 mm. long.. Calyx 1.4 mm. long.. Corolla 2.5 mm. long.. Stamens 8.. Pods slightly curved, 4–9 cm. long, 0.9–1.4 cm. wide, puberulous over surface, not bristly, unarmed or (fide Drake) prickly on margins.
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