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Acacia trinalis

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Acacia trinalis R.S.Cowan & Maslin, Nuytsia 12: 444 (1999)

Dense, rounded, multistemmed, glabrous shrub or bushy tree 1.5–4 m high. New growth resinous, glabrous. Branchlets angular, resin-ribbed at extremities. Stipules caducous, triangular, minute. Phyllodes patent to ascending, linear, straight to slightly incurved, 4.5–9 cm long, 2–3 mm wide, short-acuminate with recurved to subuncinate tip, thinly coriaceous, glabrous, with 3 raised, resinous nerves of which the central nerve most prominent and more regularly resinous; gland inconspicuous, 1–2 mm above pulvinus. Inflorescences simple, 2 per axil; peduncles mostly 4–6 mm long; heads globular, 4–4.5 mm diam., 22–28-flowered, golden; bracteoles fusiform, elliptic or oblanceolate, acute, ciliate. Flowers 5-merous; sepals narrowly oblong to linear-spathulate, free to 1/4–1/2-united, glabrous except ciliolate at apex; petals free. Pods and seeds not seen.

A poorly collected species, restricted to the area between near Marchagee (c. 65 km N of Moora) SE to the Mortlock R. (near Goomalling) where several collections have been made. Grows in or near areas with saline conditions in more or less swampy areas in brown sand and clay loam.

At both K and BM, the numbered Drummond collection cited above is mounted on the same sheet with syntype material of A. benthamii .

May be mistaken for the more southern A. heteroclita which differs most obviously in its normally golden-sericeous new shoots and non resin-ribbed branchlet apices. Also related to A. triptycha .

Type of accepted name

c. 10 km from Wongan Hills towards Piawaning, W.A., 10 Sept. 1975, B.R.Maslin 3812 ; holo: PERTH; iso: BM, BRI, CANB, G, K, MEL, NSW, NY.

Synonymy

[ Acacia cochlearis auct. non (Labill.) H.L.Wendl.: G.Bentham, Fl. Austral. 2: 324 (1864), as to J.Drummond 2: 139 , BM, K]

Representative collections

W.A.: 10 km S of Goomalling on Mortlock R. along W side of Toodyay Rd, R.S.Cowan A734 & B.R.Maslin (CANB, K, MEL, NSW, PERTH); near 25 km SE of Coorow, A.Doley 1 (PERTH); Swan R., J.Drummond 2: 139 (BM, CGE, G, K, LUND, NSW, OXF, P, PERTH, W) and s.n. (K); 3.5 km W of Miling on Miling West Rd, B.R.Maslin 6211 (BRI, NSW, PERTH).

(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: Friday 13 December 2019