Rather weak shrub or tree 2–4 m high. Branchlets glabrous. Phyllodes filiform to narrowly linear, slender, straight to shallowly incurved, flat or quadrangular to ±terete, normally 6–14 cm long, 0.8–2 mm wide, acute, flexible, green to subglaucous, glabrous, often longitudinally wrinkled when dry, finely 4-veined in all, 1-veined per face when flat. Inflorescences racemose; raceme axes normally 1–2.5 cm long, slender, glabrous; peduncles 3–6 mm long, slender, glabrous; heads globular, 12–20-flowered, pale yellow or bright lemon yellow; bracteoles peltate, with ±circular laminae white-or pale yellow-fimbriolate. Flowers 5-merous; sepals c. ⅚-united. Pods linear, straight-edged or constricted between seeds, to c. 18 cm long, 5–8 mm wide, firmly chartaceous to thinly coriaceous, glabrous. Seeds longitudinal, oblong to elliptic, 5–7 mm long, slightly shiny, black; funicle encircling seed in a single or double fold, red-brown to black; aril clavate.
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