Acacia dissona

The shrub typically grows to a height of 0.5 to 2 metres (2 to 7 ft)[1] and usually has contorted branches with ridges hairy branchlets. Like most species of Acacia it has phyllodes rather than true leaves. The evergreen, inclined to erect phyllodes are quite straight with a length of 2 to 4 cm (0.79 to 1.57 in) and a width of 1 to 1.5 mm (0.039 to 0.059 in) and narrow abruptly to a pungent and rigid tip.[2] It blooms from July to October and produces yellow flowers.[1] The simple inflorescences are found in pairs in the axils and have spherical flower-heads with a diameter of 5 to 6 mm (0.20 to 0.24 in) and contain 15 to 20 golden coloured flowers. Following flowering it produces linear seed pods that are raised over and constricted between each of the seeds. The thinly-crustaceous to thinly-coriaceous pods are moderately curved with a length of up to about 6 cm (2.4 in) and a width of around 2.5 mm (0.098 in). The glossy dark-brown seeds have an oblong-elliptic shape with of around 2.5 to 4.5 mm (0.098 to 0.177 in) and a width of around 1.5 mm (0.059 in).[2]

The species was first formally described by the botanists Richard Sumner Cowan and Bruce Maslin in 1995 as a part of the work Acacia Miscellany. Five groups of microneurous species of Acacia (Leguminosae: Mimosoideae: section Plurinerves), mostly from Western Australia as published in the journal Nuytsia.[3] There are two recognised varieties:

• Acacia dissona var. dissona
• Acacia dissona var. indoloria

It is native to an area in the Wheatbelt and Goldfields-Esperance regions of Western Australia where it is commonly situated on undulating plains growing in sandy, clay or loamy soils.[1] It has a discontinuous and scattered distribution from Coorow in the north west to Ongerup in the south west to Southern Cross in the north east and Norseman in the south east.[2]

• List of Acacia species