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Acacia concurrens (MIMOSACEAE) Black Wattle, Curracabah

Image: Foliage

Acacia concurrens Black Wattle
Photo: Robert Whyte

Tall shrub, small tree to 10m on sandy or stony soils in forest understorey over most of South East Queensland and surrounding regions including NSW.

Will usually be smaller than 10m and quite common in regrowth of disturbed coastal areas, hardy, fast growing. The leaves are flatttened leaf stalks, not real leaves at all, called phyllodes. The upper margin is curved, the lower margin more or less straight. The obvious veins join at the base, hence the name.

The bark can be fissured, and is usually fibrous, grey-black. Branchlets angular, stout, brown. The first few leaves of seedlings are usually thin, and have the true leaves fringing the phyllodes. The true leaves soon drop off.

Image: Flowers

Acacia concurrens Black Wattle
Photo: Robert Whyte

Acacias can fix nitrogen in the soil which gives them an advantage which explains their success in disturbed sites where soil is poor.

The type was collected by A. Cunningham near the Brisbane River, Queensland. Bark, seeds, and wood of this and other acacia species important sources of material and nourishment for coastal Aboriginaal tribes.

Host plant for larvae of Blue Jewel (Hypochrysops delicia), Emerald Hairstreak (Jalmenus daemeli), Common Imperial Hairstreak (Jalmenus evagoras evagoras), Stencilled Hairstreak (Jalmenus ictinus).

Flowers and buds attract Felder's Line-blue (Prosotas felderi), Small Purple Line-blue (Prosotas dubiosa) and Glistening Blue (Sahulana scintillata).

Useful honey tree.

The name refers to the converging primary veins of the phyllodes. Closely related to A. leiocalyx which is distinguished by more angular and reddish branchlets, shorter pulvinus, green phyllodes and deeper yellow flower heads, and to A. crassa which has more dense, deep yellow spikes, shorter pulvinus and generally larger green phyllodes. Intermediates between A. concurrens and A. leiocalyx occur in northern New South Wales.

References and resources