Acacia concurrens (MIMOSACEAE) Black Wattle, Curracabah

Plants to Plant

Dense shrub or small tree to 8 m on sandy or stony soils in open forest. Found in understorey over most of South-East Queensland and surrounding regions including NSW. Will usually be smaller than 8 m 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. Acacias can fix nitrogen in the soil which gives them an advantage which explains their success in disturbed sites where soil is poor.
Photo: Robert Whyte

Name and Host Plant

 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 NSW. The type was collected by botanist and explorer Allan Cunningham near the Brisbane River, Queensland. Bark, seeds, and wood of this and other acacia species important sources of material and nourishment for coastal Aboriginal tribes. Host plant for larvae of Blue Jewel Hypochrysops delicia, Emerald Hairstreak Jalmenus daemeli, Common Imperial Hairstreak Jalmenus evagoras evagoras, Stencilled Hairstreak Jalmenus ictinus butterflies. Flowers and buds attract Felder’s Line-blue Prosotas felderi, Small Purple Line-blue Prosotas dubiosa and Glistening Blue Sahulana scintillata butterflies. Also a useful honey tree.

References and Resources

World Wide Wattle PlantNET plant Search, NSW Herbarium – Excellent resource, probably the best online plant database.

Photo: Robert Whyte