Acacia brachybotrya Benth.

Grey Mulga

London J. Bot. 1: 347 (1842) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native (naturalised in part(s) of state)

Rounded shrub, 1–3 m high; branchlets variably hairy, sometimes glabrous. Phyllodes variable, normally slightly asymmetrically oblong-elliptic to oblong-obovate (but frequently narrowly so) or obovate to oblanceolate, usually 1–3 cm long and 4–13 mm wide, 1.5–3.5 times as long as wide, indumentum similar to branchlets, hairs if present scattered, sometimes glabrous, grey-green to glaucous, obtuse to subacute; 1-veined, lateral veins not prominent; gland very small, near centre of upper margin, second gland sometimes present just above pulvinus. Inflorescence 1–5-headed, rachis 0.5–5 mm long, hairy or glabrous; peduncles slender, 4–15 mm long, hairy, sometimes glabrous; heads globular, 18–30-flowered, golden. Flowers 5-merous; calyx variably dissected. Pods linear to narrowly oblong, to 9 cm long, 4–8 mm wide, firmly chartaceous to coriaceous, glabrous or hairy, dark brown or black, lightly pruinose; seeds longitudinal, 4–5.5 mm long, subshiny, brown to black, punctate about centre, funicle short, aril enlarged. Flowers Jul.–Oct.

DunT, Gold, GGr, LoM, MuF, MuM, RobP, Wim, *GipP. Also SA, NSW. Extending through north-western Victoria, growing in a variety of soils, in mallee communities on sandy loam soils, or in taller woodland on more fertile loams.

Very polymorphic and species, morphologically very similar to A. dictyocarpa, the latter being distinguished by the appressed hairs that are silvery or golden on new shoots, whereas A. brachybotrya has more or less patent hairs on new growth. There is no apparent disjunction in the distribution of these two species.

Hybrids between A. brachybotrya and A. calamifolia are referred to A. ×grayana.

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, 2018-08-27
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 brachybotrya in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Acacia brachybotrya in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Lowan Mallee present native
Murray Mallee present native
Wimmera present native
Robinvale Plains present native
Murray Fans present native
Gippsland Plain present naturalised
Goldfields present native
Greater Grampians present native
Dundas Tablelands present native

State distribution

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