Scientific name Acacia acanthoclada
|Similar Acacia brachystachya, Acacia alpina, Acacia beckleri, Acacia ausfeldii, Acacia aspera|
Acacia acanthoclada, commonly known as harrow wattle, is a low, divaricate, highly branched and spinescent shrub that is endemic to Australia.
It grows up to 2 metres high and has phyllodes which measure 0.2 to 0.6 cm long and 1 to 2 mm wide. The phyllodes are straight, narrow-cuneate, slightly notched at the apex, and feature prominent midveins. Branchlets are terete, whitish and densely pubescent, As the branch grows it becomes glabrous and terminates in a rigid spinose point. The bark is grey, white or occasionally greenish.
The golden-yellow flowerheads, on 5–15 cm long peduncles, appear at the phyllode axils. Flower parts are pentamerous, with the sepals fused into a synsepalous calyx. Flowers appear from August to October, followed by irregularly twisted, glaucous, brown seed pods which are 3 to 6 cm long and 3 to 6 mm wide.
Its occurs naturally in Western Australia, South Australia and Victoria and is listed as endangered under the Threatened Species Conservation Act in New South Wales.
The species was formally described in 1863 by Victorian Government Botanist Ferdinand von Mueller in the third volume of his Fragmenta Phytographiae Australiae, based on plant material collected near Kulkyne, Victoria.
Two subspecies are recognised:
The species is relatively uncommon and is found scattered at several sites in isolated clumps: Buronga, Wentworth and Pooncarie districts in far south-western New South Wales, Victoria, South Australia and Arumpo Station and Montarna Station in Western Australia. Arumpo Station in particular is home to a stunted sample, which is threatened by overgrazing by kangaroos.
This species usually grows on deep, loose, sandy soil. It inhabits undisturbed mallee areas, often on ridges and dunes, and more rarely on rock outcrops.