Acacia ampliata R.S.Cowan & Maslin, Nuytsia 10: 16 (1995)
Shrub or small tree 2–5 m high. Branchlets slightly ribbed, silvery sericeous and with scattered patches of red-brown resin-hairs. Phyllodes ascending to erect, linear to linear-elliptic, straight to incurved, 8–19 cm long, 3–6 mm wide, acute, rigid, sparsely sericeous, striate by numerous closely parallel nerves, the central nerve raised and conspicuous, the marginal nerves broad. Inflorescences simple, 1 or 2 per axil; peduncles 3.5–9 mm long, with indumentum as on branchlets; heads obloid to short-cylindrical, 9–12 mm long, 7–8 mm diam., densely flowered, golden. Flowers 5-merous; sepals 1/2-united. Pods linear, slightly raised over and slightly constricted between seeds, to 11 cm long, 5–6 mm wide, coriaceous to crustaceous, invested with minute red-brown resin-hairs. Seeds longitudinal, broadly elliptic to elliptic-oblong, 4.5–6 mm long, shiny, dark brown-black; aril much-folded.
Restricted to near Mullewa with one collection from near Coolcalalaya (c. 100 km NNW of Mullewa), south-western W.A. Grows in loam, sandy loam and sand in Mallee scrub.
Most closely related to A. jamesiana which has normally tetragonous phyllodes 1–1.5 mm wide (rarely to 3 mm and flat) and pods 4 mm wide. Also related, but more distantly, to A. heteroneura var. heteroneura which has compressed-rhombic to flat phyllodes normally 5–7 cm long, 2–4 mm wide, globular heads with less densely arranged flowers, pods to 5.5 cm long and 2 mm wide, and mottled seeds.
Type of accepted name
5 km S of Mullewa on road to Mingenew, W.A., 17 Dec. 1981, B.R.Maslin 5079 ; holo: PERTH; iso: CANB, G, K, MEL, NSW, NY.
Representative collections
W.A.: c. 16 km E of Mullewa, A.M.Ashby 4509 (PERTH); S of Coolcalalaya, J.S.Beard 7149 (PERTH).
(RSC & BRM)
The information presented here originally appeared on the WATTLE CD-ROM which was jointly published by the Australian Biological Resources Study, Canberra, and the Department of Parks and Wildlife, Perth; it was produced by CSIRO Publishing from where it is available for purchase. The WATTLE custodians are thanked for allowing us to post this information here.
