Acacia marramamba Maslin

Shrubby glabrous tree 2–3 m tall, sometimes to 5 m. Bark slightly fissured and fibrous towards base of trunks, otherwise smooth (not corky). Branchlets red, light brown or orange. Stipules spinose, commonly absent from mature nodes, mostly 2–4 mm long. Phyllodes inequilaterally elliptic, with a conspicuously rounded adaxial margin and almost straight abaxial margin, 2–5 cm long, 9–23 mm wide, scarcely undulate, acute to acuminate, pungent, coriaceous, pale green to subglaucous, not obviously pruinose; midrib prominent and excentric; lateral nerves obscure and sparingly anastomosing. Inflorescences racemose; raceme axes 6–15 cm long and (together with peduncles and buds) red to red-brown; peduncles twinned, 1–2 cm long; heads globular, 25–35-flowered, light golden to mid-golden. Flowers 5-merous; sepals ±free; petals red to red-brown at apices. Pods narrowly oblong, straight to shallowly curved, to 7.5 cm long, 7–9 mm wide, chartaceous to thinly coriaceous, light brown. Seeds mostly oblique, broadly elliptic to almost orbicular, dull, black, 4.5–5 mm long; funicle not encircling seeds; aril clavate.

Grows in skeletal sandy loam on rocky hills (Marra Mamba Iron Formation) in open scrub or tall open shrubland with spinifex ground cover. Not a particularly common species and although it does not form dense populations it is generally not uncommon where it occurs.