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Acacia lasiocalyx

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Acacia lasiocalyx C.R.P.Andrews, J. Western Australia Nat. Hist. Soc . 1: 41 (1904)

Spreading, open, glabrous shrub or tree 2–3.5 m, sometimes erect tree to 10 m high. Branchlets pruinose. Phyllodes pendent, linear, straight to curved with apices always obviously curved, 13–30 cm long, 2–10 mm wide, acute to acuminate, coriaceous, finely multistriate with midrib the most prominent. Inflorescences simple, sometimes a few rudimentary racemes interspersed with axes 0.5–1 mm long; peduncles paired, 8–17 mm long, pruinose; spikes 20–40 mm long, 6–7 mm diam., dense, golden. Flowers 5-merous; sepals united. Pods linear, raised over seeds, straight to slightly curved, to 16 cm long, 4.5–5.5 mm wide, coriaceous, pruinose. Seeds longitudinal, elliptic-oblong, 5–6 mm long, glossy, dark brown; areole U-shaped and much shorter than seed; funicle-aril thick and in several loops at seed-end.

Widely distributed in south-western W.A. from near Enneaba and near Kalgoorlie S to near Bremer Bay and Mt Heywood, NE of Esperance. Grows in sand, gravelly sand, loamy sand, clayey sand and loam, commonly on slopes of granitic hills, granite outcrops and around such granitic sites, but also on sandplains and on laterite, in mallee woodland, mallee heath and open heath.

Plants growing at the base of granite rocks often form dense colonies and attain an arborescent habit, the main trunk more erect and straight than those of plants occurring elsewhere.

Most closely related to A. conniana which has nonpruinose branchlets, generally shorter phyllodes, commonly shorter spikes and somewhat smaller pods enclosing smaller seeds with a closed or nearly closed, narrowly elongate areole. Another relative is A. anastema which has free sepals (or united at the very base) and narrower pods. Also related to A. longiphyllodinea which has terete phyllodes that lack a clearly defined pulvinus and are continuous on the branchlet.

Field observations by Maslin suggest that this species forms hybrids with A. inophloia near Bendering, W.A.

Type of accepted name

Near Gairdner and Hamersley Rivers, W.A., Oct. 1903, Herb. Cecil Andrews ; holo: NSW; ?iso: NSW [sphalm. ‘Jerramongup’], PERTH.

Synonymy

[ Acacia doratoxylon auct. non A.Cunn.: C.F.W.Meissner in J.G.C.Lehmann, Pl. Priess . 1: 19 (1844), as to L.Preiss 935 (G, LUND, NY, P) and 945 (LUND, NY)]

[ Acacia acuminata auct. non Benth.: G.Bentham, Fl. Austral . 2: 404 (1864), p.p ., as to L.Preiss 935 & 945 (see above), and J.Drummond 6 (CGE, K, MEL, OXF, P) & 3: 99 (FI, G, G-DC, K, MEL, NSW, OXF, P, TCD)]

[ Acacia signata auct. non F.Muell.: E.G.Pritzel, Bot. Jahrb. Syst . 35: 308 (1904), as to E.Pritzel 559 (B, E, G, K, L, MO, P, PR, US, W, Z)]

Illustrations

W.R.Elliot & D.L.Jones, Encycl. Austral. Pl . 2: 71 (1982); M.Simmons, Acacias Australia 2: 257 (1988).

Representative collections

W.A: Dajoing Rock, 6.5 km NW of Wialki, T.E.H.Aplin 5970 (MO, NSW, PERTH); 46 km from Coolgardie towards Norseman, B.Barnsley 1048 (CANB, PERTH); c. 260 km N of Perth [near Arrowsmith], E.McCrum 48 (PERTH); Wittenoom Hills, S side at base, B.R.Maslin 5541 (PERTH); 12 km S of Ongerup, K.Newbey 9490 (MELU, PERTH).

(BRM & RSC)

WATTLE Acacias of Australia CD-ROM graphic

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.

Page last updated: Tuesday 11 September 2018