Acacia euthycarpa is a species of flowering plant in the family Fabaceae and is endemic to south-eastern continental Australia. It is a shrub, occasionally a tree, with glabrous branchlets, narrowly linear to lance-shaped phyllodes, spherical to shortly oblong heads of golden yellow flowers and linear pods.
Acacia euthycarpa is usually a shrub that typically grows to a height of 2–4m (6ft 7in– 13ft 1in), but is occasionally a tree up to 10m (33ft). Its new shoots and branchlets are glabrous. The phyllodes are linear to lance-shaped with the narrower end towards the base, mostly 20–100mm (0.79–3.94in) long and 1–6mm (0.039–0.236in) wide. The flowers are borne in spherical to shortly oblong heads on a peduncle3–10mm (0.12–0.39in) long, each head with usually 25 to 60 golden yellow flowers. Flowering occurs from August to October, and the pods are linear, leathery to more or less crusty, up to about 150mm (5.9in) long and 3.5–7mm (0.14–0.28in) wide and glabrous. The seeds are oblong to elliptic, 4–6mm (0.16–0.24in) long and dull to slightly shiny dark brown to black, with a club-shaped aril.[2][3][4][5][6][7]
Taxonomy
This taxon was first formally described in 1923 by John McConnell Black who gave it the name Acacia calamifolia var. euthycarpa in the Transactions of the Royal Society of South Australia.[8][9] It was subsequently promoted to species status as A. euthycarpa in 1945 by Black in a later edition of the same journal.[10] The specific epithet (euthycarpa) means 'straight fruit', referring to the sides of the fruit.[5]
Acacia euthycarpa(J.M.Black) J.M.Black subsp. euthycarpa[11] has narrowly linear phyllodes, 0.7–2mm (0.028–0.079in) wide.[12][13]
Acacia euthycarpa subsp. oblanceolataS.Wright[14] (formerly known as Acacia euthycarpa var. oblanceolata)[15] has narrowly lance-shaped phyllodes with the narrower end towards the base, 2.5–6mm (0.098–0.236in) wide.[16]
Subspecies euthycarpa is found mostly in scrub or woodland and is common in the west and central west of Victoria, and the Eyre Peninsula, southern Mount Lofty Ranges and Murray Lands of South Australia.[13]
* Subspecies oblanceolata is found in scrub or open woodland, often on rocky sites, and is only known from the Wychitella Flora and Fauna Reserve and Yowang Hill (in central western Victoria), and near Kimba on the Eyre Peninsula and near Murray Bridge (although the specimen from near Murray Bridge was collected in 1848, and may no longer be there).[13]
Ecology
This species is a food plant for larvae of the Icilius blue butterfly.[7]
12Maslin, Bruce R.; O'Leary, Martin C. Kodela, Phillip G. (ed.). "Acacia euthycarpa". Flora of Australia. Australian Biological Resources Study, Department of Climate Change, Energy, the Environment and Water: Canberra. Retrieved 1 December 2025.
↑Entwisle, Timothy J.; Maslin, Bruce R.; Cowan, Richard S.; Court, Arthur B.; Stajsic, Val. "Acacia euthycarpa". Royal Botanic Gardens Victoria. Retrieved 1 December 2025.
12Wild Plants of Victoria (database). Viridans Biological Databases & Department of Sustainability and Environment. 2009.
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