Acacia mearnsii De Wild.

Black Wattle

Pl. Bequaert. 3: 61 (1925) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Tree to 15 m high, spreading; bark smooth and greenish-brown on young branches, blackish and rough on trunk; branchlets angular, pubescent. Leaves bipinnate, olive-green; rachis 4–15 cm long, grooved, pubescent, with a raised gland at the junction of each pinna pair and additional glands irregularly spaced between successive pairs; pinnae in 8–25 pairs; pinnules in 30–70 pairs, crowded, linear-oblong, 1–5 mm long, 0.5–0.8 mm wide, within a single pinna more or less equal in length, pubescent (mostly around margins), apex obtuse. Inflorescence a raceme or panicle; heads globular, 20–30-flowered, pale yellow, peduncles to 8 mm long. Pod more or less straight, 5–10 cm long, 5–8 mm wide, strongly constricted between seeds, dark brown to black. Flowers Sep.–Nov.

CVU, DunT, EGL, EGU, GipP, Glep, Gold, GGr, HNF, HSF, MonT, MuF, NIS, OtP, OtR, SnM, Strz, VAlp, VRiv, VVP, WaP, WPro, Wim. Also SA, Tas. Widespread and common in lowlands. Grows in open forest, heathy woodland and on cleared land, particularly on dry, shallow soils.

The presence of glands at the junction of, as well as between, the pinna pairs distinguishes A. mearnsii from A. dealbata. Acacia mearnsii is usually later flowering than both A. dealbata and A. decurrens.

Source: Entwisle, T.J.; Maslin, B.R.; Cowan, R.S.; Court, A.B. (1996). Mimosaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 3, Dicotyledons Winteraceae to Myrtaceae. Inkata Press, Melbourne.
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Rosanae
order Fabales
family Fabaceae
genus Acacia
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Acacia mearnsii in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Acacia mearnsii in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Wimmera present native
Glenelg Plain present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Murray Fans present native
Gippsland Plain present native
Otway Plain present native
Warrnambool Plain present native
Goldfields present native
Central Victorian Uplands present native
Greater Grampians present native
Dundas Tablelands present native
Northern Inland Slopes present native
East Gippsland Lowlands present native
East Gippsland Uplands present native
Wilsons Promontory present native
Highlands-Southern Fall present native
Highlands-Northern Fall present native
Otway Ranges present native
Strzelecki Ranges present native
Monaro Tablelands present native
Victorian Alps present native
Snowy Mountains present native

State distribution

Distribution map
Western Australia
South Australia
New South Wales
Australian Capital Territory