Acacia gelasina Maslin, Nuytsia 10: 194 (1995)
Glabrous shrub 1–2.5 m high. Phyllodes erect, oblanceolate to linear-oblanceolate, 4–10 cm long, 3–8 mm wide, narrowed at base, obtuse, mucronate, thickly coriaceous, subrigid, glaucous to subglaucous; midrib and marginal nerves yellow; lateral nerves obscure; glands obscure, normally 1–3 mm above pulvinus, also at base of mucro. Inflorescences (1- ) 2–6-headed racemes; raceme axes 2–20 mm long; peduncles 1–2 cm long; heads globular, densely 35–50-flowered, ?pale yellow. Flowers 5-merous; sepals free or sometimes 2 or 3 partially united. Pods narrowly oblong, flat, rounded over seeds and shallowly constricted between them, to 15 cm long, 12–14 mm wide, firmly chartaceous to thinly coriaceous, normally yellow-brown. Seeds longitudinal, circular to broadly elliptic or broadly ovate, somewhat flattened, 7–8 mm long, slightly shiny, dark brown to blackish, pale-coloured at the shallowly depressed centre, exarillate.
Restricted to a small area along the North West Coastal Hwy N of the Murchison R. (E of Kalbarri), W.A. Grows in yellow sand in closed scrub.
Similar to the widespread, commonly arborescent, Arid Zone species, A. murrayana , which has thinly coriaceous phyllodes, often pruinose branchlets, normally shorter peduncles in longer racemes, and oblique to transverse, smaller seeds, see B.R. Maslin, loc. cit. , for further details.
Type of accepted name
46.5 km N of Murchison R., North West Coastal Hwy, W.A., 23 July 1972, A.M.Ashby 4638 ; holo: PERTH; iso: CANB, PERTH.
W.A.: type locality, A.M.Ashby 3874 (K, MEL, PERTH); 15 km N of Murchison R. on North West Coastal Hwy, H.Demarz 10490 (PERTH); 45 km N of Murchison R. on North West Coastal Hwy, B.R.Maslin 3346 (BRI, G, NY, PERTH).