Acacia latifolia Benth.
Acacia latifolia Benth.
Occurs in tropical W.A., N.T. (including Sir Edward Pellow Group) and extreme north-western Qld, N of 18ºS.
Shrub or tree to 5 m high, single-stemmed, pruinose. Bark smooth, brown. Branchlets flattened, 0.5–1 cm wide, tawny yellow or brown, pruinose, glabrous, bearing wings 0.8–2.5 mm wide, formed by decurrencies with phyllodes (lower edge of phyllode usually continuous with branchlet). Phyllodes obliquely narrowly lanceolate to ovate or elliptic, (3–) 6.5–18 cm long, 14–45 mm wide, with convex upper margin, thin to subcoriaceous, glabrous, with 3–5 conspicuous longitudinal nerves (the pair closest to lower concave or straight margin confluent to 2 cm above base, the other nerves separate to the base but not reaching apex); minor nerves anastomosing, 2 or 3 per mm; gland 1, basal, to 3 mm above pulvinus. Spikes usually 1.6–2.7 cm long, golden. Flowers 5-merous; calyx 0.2–0.5 mm long, truncate or dissected to 1/4, glabrous; corolla 1.8–2.5 mm long, glabrous, with free petals; ovary glabrous. Pods linear, straight-sided, straight or slightly falcate, flat or slightly twisted, 4–11 cm long, 2–4.5 (–5.5) mm wide, glabrous; margins pale, prominent. Seeds longitudinal, oblong-elliptic, 2.2–4.7 mm long, brown; areole open.
Grows often on sandstone plateaux with laterite gravel, on cliffs near the ocean, along watercourses in gullies or in crevices amongst boulders, sometimes on basalt or quartzite, in sandy, stony, often alluvial soils, in mixed shrubland.
W.A.: near Mt Agnes, Central Kimberley, C.A.Gardner 1435 (NSW, PERTH). N.T.: S of Katherine Gorge, M.I.H.Brooker 3151 (FRI, NSW); Bartalumba Bay, Groote Eylandt, 30 Aug. 1971, K.Hodder (DNA, NSW); top of Gunlom Falls, Kakadu Natl Park, R.Johnson 159 (DNA, NSW, PERTH). Qld: Westmoreland Stn, C.H.Gittins 832 (BRI, NSW); Hells Gate, between Doomadgee and ‘Westmoreland’, R.Pullen 9171 (CANB, NSW).
This species is characterised by usually elongated peduncles (5–) 15–50 mm long, flattened-winged stems and large corollas. A variant from N.T. is characterised by very large inflorescences 4.5–7 cm long, (e.g. M.Lazarides 9151 from near mouth of Sawcut Gorge, Kakadu Natl Park, (CANB, NSW). A variant with smaller than normal phyllodes (3–5 cm long) occurs 15 km WSW of King George R. Falls, W.A. (e.g. S.J.Forbes 2730 et al., BRI, MEL, PERTH).
Data derived from Flora of Australia Volumes 11A (2001), 11B (2001) and 12 (1998), products of ABRS, ©Commonwealth of Australia
Dr M.D.Tindale and Dr P.G.Kodela with the assistance of M.Bedward, S.J.Davies, C.Herscovitch, D.A.Keith and/or D.A.Morrison
Minor edits by J.Rogers
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