Acacia juncifolia Benth.

Somewhat spindly shrub to c. 3 m high. Branchlets slender, lenticellular, dark reddish brown, glabrous. Phyllodes filiform, ascending to erect, straight to shallowly incurved, terete to subquadrangular or flat, 7–20 cm long, c. 1 mm wide, not rigid, acute, with mucro indurate but not sharply pungent, finely longitudinally sulcate when dry, glabrous; rather obscurely 4-veined in all, 1-veined per face when flat with midrib slightly raised when dry; gland 2–8 mm above pulvinus; pulvinus 1–2 mm long. Inflorescences simple and (fewer) rudimentary 1‑headed racemes with axes 1–2 mm long intermixed, usually 1–2 per axil; peduncles 4–12 mm long, glabrous; basal bract persistent; heads globular, 20–30-flowered, pale yellow to deep buttercup yellow. Flowers 5-merous; sepals free, linear-spathulate. Pods prominently raised over seeds and slightly to moderately constricted between them, to 10 cm long, 3–4 mm wide, firmly chartaceous to thinly coriaceous, dark red-brown, glabrous. Seeds longitudinal, oblong-elliptic, 3.5–4.5 mm long, dull, mottled black and yellow, ±exarillate.

Grows in shallow sand derived from sandstone or less commonly from granite, in Eucalyptus forest or woodland; in coastal areas it occurs in deep sand in heath.