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Flora of Australia Online

Acacia coolgardiensis Maiden, J. & Proc. Roy. Soc. New South Wales 53: 211; pl. 15, figs 1–7 (1920)

T: Coolgardie, W.A., 1900, L.C.Webster ; lecto: NSW, fide R.S.Cowan & B.R.Maslin, Nuytsia 10: 18 (1995); isolecto: K, PERTH; Coolgardie, W.A., 1899, L.C.Webster ; paralecto: NSW.

Shrub or tree 1–7 m high, commonly with fluted trunks and main branches. Bark stringy or smooth. Branchlets resinous-ribbed, appressed-puberulous between ribs. Phyllodes patent to ascending, terete, subterete, compressed or flat and linear, narrowly oblanceolate or linear-elliptic, straight to curved, 4.5–15 cm long, 0.7–10 mm wide, acute, coriaceous to rigid, grey-green, light green or silvery, sometimes glaucous, commonly minutely appressed-puberulous between nerves, ±resinous, with numerous closely parallel nerves. Inflorescences simple, 2 per axil; peduncles 0–8 mm long, appressed-puberulous; heads globular, widely ellipsoid, obloid, or cylindrical, 5–34 mm long, 4–7 mm diam., golden. Flowers 5-merous; sepals free to 1/2-united. Pods patent to pendulous, straight to slightly curved, terete, to 10 cm long, 1.3–3 mm diam., coriaceous, appressed-puberulous between ribs, often ±resinous. Seeds longitudinal, oblong to broadly elliptic, 2.2–4 mm long, glossy, tan; aril apical. 

Often locally common in western-central W.A. from near the Overlander Roadhouse (c. 150 km NNE of Kalbarri) and Northampton E to Barwidgee Stn (c. 85 km SE of Wiluna) and Menangina Stn (c. 110 km NNE of Kalgoorlie) and S to near Holt Rock (c. 100 km NE of Lake Grace). Also occurs NE and E of Overlander Roadhouse at Carey Down, Byro and Curbur Stns, with a northern outlier near Paraburdoo. 

A wide-ranging species comprising three subspecies, one with two variants; further study may necessitate recognition of one or more of these as distinct species. See R.S.Cowan & B.R.Maslin, Nuytsia 10: 19, 22 (1995), for discussions of variation.

Probably most nearly related to the A. aneura complex, A. ramulosa in particular, which has very different pods and seeds. Superficially similar to A. isoneura subsp. isoneura .

(R.S.Cowan)

1 Phyllodes terete, rarely subterete to compressed, filiform, grey-green; flower-heads 5–14 mm long

subsp. coolgardiensis

1: Phyllodes flat, linear to oblanceolate

2

2 Peduncles 0–1.5 mm long; flower-heads not more than 10 mm long

subsp. effusa

2: Peduncles 2.5–8 mm long

3

3 Phyllodes 5–10 mm wide, narrowly oblanceolate, linear-oblanceolate or linear-elliptic, silvery; flower-heads 8–12 mm long

subsp. latior

3: Phyllodes 1–3 mm wide, linear, light green to grey-green or glaucous; flower-heads 12–34 mm long

subsp. effusa

 

Data derived from Flora of Australia Volumes 11A (2001), 11B (2001) and 12 (1998), products of ABRS, ©Commonwealth of Australia