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