Acacia longispinea Morrison, Scott. Bot. Rev . 1: 96 (1912); Trans. & Proc. Bot. Soc . Edinburgh 26 (1): 52 (1912)
Shrub 2–5 m high. Branchlets terete, glabrous, lenticellular, scarred by raised stem-projections where phyllodes have fallen. Phyllodes ascending to erect, straight to shallowly incurved, pentagonal in section, 7–23.5 cm long, 1–2.5 mm wide, coarsely pungent, rigid, glabrous, with 5 distant, strongly raised nerves; gland 2–14 mm above base; pulvinus very reduced. Inflorescences single, simple or in rudimentary racemes with axes 0.5–2 mm long; peduncles 9–20 mm long, glabrous; heads globular, 6–8 mm diam., 60–85-flowered, golden; bracteoles peltate. Flowers 5-merous; sepals free. Pods pendent, linear, raised over and sometimes constricted between seeds, straight, to 7.5 cm long, 5–8 mm wide, chartaceous, glabrous. Seeds longitudinal, broad-ovate to nearly circular, 3–6 mm long, dull, mottled, exarillate.
Occurs from near Hamelin SE to Narembeen and Boorabbin with eastern outliers at Albion Downs, Comet Vale and near Spargoville, W.A. Grows mostly in sand in scrub and in clayey sand or clay loam in shrubland.
There are other species, such as A. gonophylla , with pentagonal phyllodes but none with other characteristics sufficiently similar to those of A. longispinea to suggest close relationship.
Type of accepted name
Kununoppin, W.A., F.E.Victor ; ?holo: E n.v ; iso: NSW.
W.A.: 0.4 km N of Booralaming Hall, B.R.Maslin 148 (PERTH); Ebano near Yandanooka, 24 Sept. 1904, A.Morrison s.n. (PERTH); Kununoppin, 30 Dec. 1916, F.E.Victor s.n. and 21 (PERTH); 43 km S of Coolgardie towards Norseman, 3 Oct. 1961, J.H.Willis (PERTH).