Straggling or erect shrub 1–3 (–5) m high. Bark smooth, grey, often mottled. Branchlets dark brown, grey-puberulous, with knobbly ridges c. 0.5 mm high. Young foliage-tips sulphur-yellow, tomentose. Leaves thick, coriaceous, dark green; petiole above pulvinus 0.2–1 cm long, vertically flattened, with 1 grey-puberulous gland at base of or below lowest pair of pinnae; rachis 1.7–5 (–8.5) cm long, with 1 orbicular raised puberulous jugary gland at all or most pairs of pinnae; interjugary glands rare; pinnae 6–14 (–19) pairs, 0.8–3 cm long; pinnules 9–30 pairs, closely spaced, ± narrowly oblong, 1–2.5 (–4) mm long, 0.5–0.8 mm wide, subglabrous or white-or yellow-puberulous, broadly rounded apically. Inflorescences in axillary racemes or sometimes in terminal false-panicles; peduncles 2–6 (–10) mm long, appressed-hairy. Heads globular, 30–45-flowered, pale yellow or cream-coloured. Pods straight to slightly curved, 3–7 (–11.5) cm long, 7–10 mm wide, coriaceous, black or dark brown, grey-puberulous, glabrescent.
Forming almost impenetrable whipstick scrubs on rocky, knife-edge ridges of rhyolite, granite and aplite, mostly in poor soils, sometimes in rich black loam.
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