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Acacia excentrica

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Acacia excentrica Maiden & Blakely, J. & Proc. Roy. Soc. W Australia 13: 4; pl. 2, figs 1–6 (1928)

Prostrate, domed or spreading subshrub to c. 0.5 m high. Branchlets pubescent to villous, glabrescent. Stipules subpersistent, 1–2 mm long. Phyllodes subcrowded, slightly asymmetric, narrowly elliptic to oblong-elliptic, occasionally lanceolate, 1–2 cm long, 2–5 mm wide, l:w = 2.5–7.5, normally acute, excentrically or obliquely mucronate, coarsely to sharply pungent, coriaceous, glabrous, infrequently pubescent; midrib evident and situated slightly towards the 1-nerved abaxial margin; adaxial margin finely 2-nerved with nerves usually coalescing near or above middle of phyllode; gland inconspicuous, to 1 mm above pulvinus. Inflorescences simple or extremely rudimentary, 1- or 2-headed racemes with axes less than 0.5–1 mm long; peduncles 7–15 mm long, glabrous; heads globular, 4–4.5 mm diam., 20–30-flowered, golden. Flowers 5-merous; sepals free. Pods (immature) linear, 1- or 2-coiled, one margin puberulous. Seeds not seen.

Occurs from near Mt Ragged east to near Cocklebiddy, south-western W.A., with a glabrous variant from the Ravensthorpe Ra., c. 300 km west of Mt Ragged.

A variant from the Ravensthorpe Ra., not included in the description, may represent a distinct species. It differs most significantly from A. excentrica in the following ways: branchlets glabrous or with appressed hairs; phyllodes frequently continuous with the branchlets (but not always forming cauline wings), with midrib usually central and drying the same colour as the rest of the lamina (drying yellow in typical variant), with nerves on adaxial margin very indistinct, with gland 3–5 mm above pulvinus; peduncles 1 per axil, 5–9 mm long.

Resembling broad phyllode forms of A. lachnophylla and A. poliochroa . Similar to A. merrallii . Inflorescence and carpological characters suggest some affinities with A. glaucoptera .

Type of accepted name

Israelite Bay, W.A., Sept. 1915, J.P.Brookes ; holo: NSW.

Illustration

J.H.Maiden & W.F.Blakely, loc. cit.

Representative collections

W.A.: 13.5 km S of Cocklebiddy, A.S.George 11843 (PERTH, TLF); 12.8 km SW of Mt Ragged, P.G.Wilson 10064 (MEL, PERTH).

(BRM)

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