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Acacia lachnophylla

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Acacia lachnophylla F.Muell., S. Sci. Rec . 2 (7): 150 (1882)

Prostrate, domed or spreading shrub to 0.8 m high. Branchlets densely pilose to pubescent. Stipules caducous. Phyllodes crowded, scattered or irregularly verticillate, on raised stem-projections, patent to erect, linear, straight to shallowly incurved, subterete to flat, 1–2 cm long, 0.7–1 (- 1.5) mm wide, narrowed at base, acute, obliquely mucronate, usually pilose, 4-nerved in all, 1-nerved per face when flat with midrib not prominent; gland inconspicuous, commonly 4–12 mm above pulvinus. Inflorescences rudimentary racemes, normally 2-headed with axes c. 0.2 mm long; peduncles 7–17 mm long, glabrous, recurved from base in fruit; heads globular, 4–4.5 mm diam., 20–32-flowered, golden. Flowers 5-merous; sepals free. Pods linear, circinnate to coiled, biconvex, 2–2.5 mm wide, crustaceous-coriaceous, black, glabrous or sparsely puberulous. Seeds longitudinal, oblong to broadly elliptic, 2–2.5 mm long, mottled; aril thick.

Occurs principally in an area bounded by Peak Charles, Norseman, Clyde Hill and Grass Patch, south-western W.A.; also in Ravensthorpe area, c. 150 km west of Grass Patch. Grows in calcareous or clay loam, sometimes with sand or gravel, in low mallee woodland, low heath or open dwarf scrub on flatlands.

Phyllodes somewhat variable: they are usually loosely pilose to pubescent (at least when young) with a fine midrib on each face, but sometimes completely glabrous and (especially Norseman- Grass Patch area) with midribs submerged so as to appear absent; superficially resembles the possibly related A. profusa . Specimens from near Mt Ridley with broader than normal phyllodes (c. 1.5 mm wide) are similar to A. excentrica which is distinguished by its broader, differently shaped phyllodes with the midrib excentric, the gland to 1 mm above pulvinus and the adaxial margin with 2 fine nerves that coalesce near or above the middle of the phyllodes (adaxial margin 1-nerved in A. lachnophylla ).

Superficially similar to A. pusilla but perhaps most closely related to A. poliochroa .

Type of accepted name

Between Esperance Bay and Fraser Ra., W.A., 1876, Dempster s.n .; holo: MEL; iso: NSW, PERTH.

Synonymy

Acacia cometes C.R.P.Andrews, J. Western Australia Nat. Hist. Soc . 1: 39 (1904). Type: Ravensthorpe, W.A., Oct. 1903, herb. Cecil Andrews ; holo: NSW; iso: K, NSW, PERTH00745170, 00745219, 00745227 and 00745235; see B.R.Maslin & R.S.Cowan, Nuytsia 9: 384 (1994), for discussion of types.

Illustration

M.Simmons, Acacias Australia 69 (1981), as A. cometes .

Representative collections

W.A.: 5.5 km NE of Clyde Hill, M.A.Burgman 1791 & S.McNee (PERTH); 7.5 km W of Grass Patch on Grass Patch Rd, B.R.Maslin 5441 (K, MEL, MEXO, PERTH); 19.3 km NW of Ravensthorpe, K.R.Newbey 3272 (CANB, 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