Acacia arrecta Maslin
Acacia arrecta Maslin
Yarnda Nyirra Wattle, Fortescue Wattle
Occurs in north-western W.A., N of the Hamersley Ra. from Millstream (21º35'S, 117º04'E) and W of 122ºE, extending S to the northern Hamersley Ra.
Compact, spreading, rounded or flat-topped, often multi-stemmed, resinous shrub 0.5–1 (–1.5) m tall and up to 2 m across. Bark smooth except at extreme base, ±grey. Branchlets terete, resin-ribbed at apices. Phyllodes curved at base to become ascending, ±terete, (1.5–) 2–4.3 cm long, 0.7–1.2 mm wide, glabrous, very obscurely 8-nerved; gland 1, obscure, basal. Inflorescences simple, axillary, bright yellow. Heads globular, dense, 7–10 mm diam., 30–45-flowered, resinous. Flowers 5-merous; calyx 1–1.3 mm long, dissected to 1/6–1/4, glabrous; corolla 2–2.5 mm long, dissected to c. 1/3, glabrous, viscid; ovary glabrous. Pods rigidly erect, linear-oblanceolate, straight, subterete to compressed, 3.5–5.5 cm long, 4–6 mm wide, woody, yellowish brown to dark brown, longitudinally nerved, glabrous, opening elastically from apex (valves recurved following dehiscence); margins not thickened. Seeds oblique, elliptic, 2.8–4 mm long, ±brown with slightly paler open areole; pleurogram with pale halo; funicle-aril straight, conical.
Appears to favour low rocky hills or stony flats, in spinifex dominated shrub-steppe.
W.A.: Creek 3 at road, southern tributary of Fortescue [R.], 30 Jan. 1975, R.F.Black (NSW, PERTH); 13 km E of Dampier–Tom Price railway, on road to Wittenoom, B.R.Maslin 5567 (NSW, PERTH); ‘Palm Springs’ (tributary of Fortescue R.), 11 km W of Millstream Stn, A.Rodd 2809 (K, NSW, PERTH).
Related to the sometimes sympatric A. hilliana which has a similar growth form and phyllodes but which is readily distinguished by its spicate inflorescences and pods with thickened marginal nerves. Probably also related to A. arida and A. orthocarpa which are most readily distinguished by their spicate inflorescences and puncticulate phyllodes.
Data derived from Flora of Australia Volumes 11A (2001), 11B (2001) and 12 (1998), products of ABRS, ©Commonwealth of Australia
Edited by B.R.Maslin
Dr M.D.Tindale and Dr P.G.Kodela with the assistance of M.Bedward, S.J.Davies, C.Herscovitch, D.A.Keith and/or D.A.Morrison
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