Tree 3–15 m high. Bark smooth, later sometimes slightly corrugated towards base, grey-green, dark grey, brown or black. Branchlets angled or vertically flattened towards apices, mostly glabrous, rarely minutely hairy along non-prominent ridges, pruinose. Young foliage-tips brownish green or cream-coloured. Leaves bipinnate, dark green; petiole above pulvinus 1.3–3.5 cm long, vertically flattened, glabrous or sometimes with sparse short white hairs, bluish glaucous, with 1 prominent spherical usually glabrous gland at or near base of lowest pair of pinnae; rachis 4.5–10 cm long, ± vertically flattened, usually with a spherical gland at base of all pairs of pinnae, sometimes also with 1–4 smaller often contiguous interjugary glands between some pairs of pinnae; pinnae 9–17 pairs, 3.5–8.3 cm long; pinnules 50–106 pairs, ±oblong to cultrate, mostly 1–2.2 mm long and 0.4–0.5 mm wide, ciliolate otherwise glabrous, subacute. Inflorescences in axillary or terminal false-panicles. Heads globular, 7–12-flowered, deep yellow. Pods usually slightly constricted between seeds, 2.5–12 cm long, 6–8 (–12) mm wide, thinly coriaceous, dark brown or blackish, bluish pruinose, glabrous; margin ±prominent.
Often grows in stands usually within 50 m of creeks, on very steep, dry, rocky hillsides facing NW, at heads of gullies and tops of knife-edge ridges, in open forest, on scree, mostly on slate or shale, sometimes in alluvial sands.
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