Acacia prismifolia E.Pritz., Bot. Jahrb. Syst. 35: 293 (1904)
Shrub 0.15–0.5 m high. Branchlets densely villous, the indumentum sparser with age. Stipules persistent, linear to linear-triangular, 1–1.5 mm long. Phyllodes frequently slightly curved, trigonous in section, 5–9 mm long, 1–2 mm wide, obtuse but with a short, distinct mucro, thick, sparsely hairy on margins and abaxial nerves, sometimes densely hairy around pulvinus, 4-nerved in all; central nerve slightly raised on upper surface but strongly raised (when dry) on lower surface; gland absent or c. 1 mm above pulvinus, obscure. Inflorescences simple, crowded at ends of branchlets; peduncles 3–4 mm long, glabrous; basal bract as long or longer than peduncle, long-rostriform, villous; heads globular, 3-4 mm diam., 9–10-flowered. Flowers 5-merous; calyx 2/3-united, the lobes triangular; petals glabrous. Pods not seen.
Known only from the type locality and another specimen purported to have been collected from Albany, south-western W.A. Gazetted a presumed extinct species in W.A. Grows on rocky slopes in dense shrubland.
Related to species of the ‘ A. sulcata group’, fide R.S.Cowan & B.R. Maslin, Nuytsia 9: 69 (1993), and perhaps closest to A. brachyphylla which has 6–8-nerved, compressed phyllodes and the sepals only shortly united basally.
Type of accepted name
Stirling Ra. [precise locality withheld for conservation reasons], W.A., 31 May 1901, L.Diels 3117 ; iso: PERTH (Fragment ex B).
W.A.: Albany, A.Meebold 11607 (M, PERTH).
(RSC & BRM)