Acacia oswaldii F.Muell.

Umbrella Wattle

Fragm. 4: 5 (1863)

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Threat status:Victoria: vulnerable (v)

Shrub or tree, 0.5–8 m high: branchlets terete, glabrous or with appressed, minute hairs, sometimes minutely woolly, typically with many red, resinous hairlets. Phyllodes spreading to erect, terete to compressed, linear, elliptic, or oblong-elliptic, 2.5–10.5 cm long, 3–15 mm wide, straight to curved, rigid, glabrous, occasionally somewhat glaucous, acute to acuminate, or obtuse and mucronate, coarsely to sharply pungent or sometimes innocuous; main veins 3–6, distant, raised, with nearly as prominent secondary veins occasionally anastamosing. Peduncles 0.5–0.8 mm long, paired, with appressed, minute hairs; heads depressed globular, 4.5–5 mm diam., 8–15-flowered, pale golden. Flowers 5-merous; sepals one-quarter to two-thirds united. Pod linear, to 31 cm long, 6–10 mm wide, coriaceous, in one to several open coils, covered with minute appressed hairs and (when young) with many clumps of red tiny hairs; seeds longitudinal, oblong-elliptic, 6–8 mm long, glossy dark-brown, aril orange, subapical. Flowers Nov.–Jan.

Gold, LoM, MuF, MuM, MSB, RobP, VRiv, WaP, Wim. Also WA, NT, SA, Qld, NSW. Widespread but rather uncommon through northwestern Victoria, mainly in calcareous sands or loam. A collection labelled Port Fairy is presumably in error or from a cultivated plant .

A transcontinental species with many variations but none of sufficient importance and discontinuity to recognize infraspecific categories. The phyllodes are especially variable in form from flat to compressed and elliptic to linear or oblong with the apex often pungent but sometimes only acute or obtuse and innocuous.

Similar to A. lanigera which is a small shrub with woolly branchlets, villose phyllode-nervature but glabrescent, heads with twice as many flowers, smaller, once-coiled, villose-tomentose pods, and smaller seeds lacking the large, colourful aril of those of A. oswaldii.

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.
Updated by: Val Stajsic, 2019-07-25
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 oswaldii in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Acacia oswaldii in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Lowan Mallee present native
Murray Mallee present native
Wimmera present native
Victorian Riverina present native
Murray Scroll Belt present native
Robinvale Plains present native
Murray Fans present native
Warrnambool Plain present native
Goldfields present native

State distribution

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