Tree 12–20 m high. Bark smooth, greyish, becoming rough, furrowed and brown with age. Branchlets terete with broad rounded ridges, densely villous with spreading white hairs (smaller hairs 0.3–0.5 mm long forming a continuous indumentum, with scattered emergent longer hairs 0.7–1.0 mm long). Leaves obovate in outline, pale light green on new growth, mid-green when mature, ±sessile; petiole 0.2–0.4 cm long, densely villous; rachis 5.3–9.5 cm long, prominently and narrowly-ridged above, densely villous with spreading white hairs c. 1 mm long; jugary glands prominently raised, circular to broadly elliptic, 0.6–1 mm diam., at base of upper 1–4 pairs of pinnae and occasionally on lower 1 or 2 pairs; pinnae 10–14 (–16) pairs, 13–61 mm long, lowermost pairs shorter than others, near-uppermost pairs the longest; pinnules 6–26 pairs, oblong-subulate, 3–6 mm long, 1–1.7 mm wide, dark green above, paler green below, setose with scattered white bristles to 0.5 mm on upper side, confined to margins and midvein below, margin recurved, apex obtuse to subacute. Inflorescences in terminal and axillary racemes and panicles. Peduncles 4.5–6.5 mm long, white appressed-pubescent. Heads globose, c. 24–31-flowered, c. 4–6 mm diam. (when dry), golden yellow. Pods straight to slightly curved, moniliform, margin moderately and ± regularly constricted between seeds, distinctly raised over seeds, 9–13.5 cm long, 7–9 mm wide, coriaceous, green becoming light to dark brown at maturity, with fine raised and reticulate lateral veins, scattered white setose with hairs to 0.6 mm long.
Grows in sheltered gullies or on mid to lower slopes, at the interface of Triassic Narrabeen sandstones and Permian claystones and shales. Sometimes forms a dense sub-canopy below Eucalyptus punctata and E. sparsifolia. For more details see Bell & Driscoll (2017).
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