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Spinifex or hummock Grassland covers 22% of the Australian continent, and is the most extensive vegetation type in Australia. It covers sandhills, sand plains and rocky ranges from the Pilbara and the Kimberly in the north west to the Mallee in Victoria. Ernest Giles called it an abomination, as it was most uncomfortable to travel through, wounding his horses legs with its needle like spikes. It is a plant that is extremely well adapted to surviving in the arid zone.