Acacia mackeyana Ewart & Jean White, Proc. Roy. Soc. Victoria n. ser. 22: 6, pls 3 & 4 (1909)
Dense, domed or obconic shrub mostly 0.5-1.7 m high. Branchlets tomentulose to appressed-tomentulose. Stipules persistent, triangular, less than 1 mm long, thick, black. Phyllodes ascending to erect, recurved or straight, terete, mostly 1–2.5 cm long, 1–1.5 mm wide, abruptly mucronate and sharply pungent, rigid, glabrous except pulvinus tomentulose, with 20 closely parallel nerves; stomata raised between nerves; gland single; pulvinus abruptly separated from blade, flared basally. Inflorescences simple, 2 per axil; peduncles 2–5 mm long, glabrous; heads globular, 3–4 mm diam., 7–12-flowered, golden. Flowers 5-merous; sepals free. Pods oblong-linear, straight or slightly curved, subterete, 1.5–3.5 cm long, 2–2.5 mm wide, thick-crustaceous, venose longitudinally, glabrous. Seeds longitudinal, narrowly oblong, 3–4 mm long, dull, dark brown to black; aril apical.
Occurs from near Coorow SE to near Corrigin and Moorine Rock (which is c. 30 km due WSW of Southern Cross) with a NW outlier at Mullewa (c. 200 km NW of Wubin) and SE outliers in the Ongerup, Ravensthorpe and Frank Hann Natl Park areas (c. 200 km SE of Corrigin- Moorine Rock), south-western W.A. Grows in gravelly soil, loam, loamy clay and sand, in woodland, mallee and scrub.
A member of the ‘ A. densiflora group’ related to A. dissona which has straight phyllodes, 15–20-flowered heads and linear, thin-crustaceous or coriaceous pods; also related to A. densiflora , which differs in its partly united sepals, tomentulose peduncles and straight, generally longer, terete to flat phyllodes.
Type of accepted name
Cowcowing, W.A., Aug. 1904, M.Koch 1013 ; lecto: MEL117106, flowering specimen, fide R.S.Cowan & B.R.Maslin, Nuytsia 10: 217 (1995); isolecto: BRI, K, NSW, P, PERTH; Cowcowing, W.A., Aug. 1904, M.Koch 1013 , fruiting specimen; paralecto: K, MEL, PERTH.
Acacia leptoneura var. mackeyana (Ewart & Jean White) Blackall & Grieve, W. Austral. Wildfl. pt 1: 197 (1954), nom. nud.
A.J.Ewart & J.White, loc. cit.
W.A.: 1 km E of 90 Mile Tank, Lake King- Kumarl road, B.R.Maslin 5789 (MEXU, PERTH); 10 km N of Coorow, B.R.Maslin 6577 (PERTH); Mullewa, 3 July 1952, N.H.Speck (PERTH); 20 km NE of Ongerup, N.Stevens KRN9520-1 (MELU, PERTH); 5.9 km SE of Bruce Rock towards Narembeen, M.D.Tindale 3736 (CANB, K, MEL, NSW, PERTH, US).