It is a prostrate, mat-forming annual or short-lived perennial herb, its stems densely hairy at first, egg-shaped to spatula-shaped stem leaves, dense spikes of hairy creamy-green flowers with two or three fertile stamens.

Ptilotus aervoides is a prostrate, mat-forming annual or short-lived perennial herb that typically grows up to 4 cm (1.6 in) high and 70 cm (28 in) wide, with densely hairy young stems that become glabrous as they age.

[2][3][4] This species was first formally described in 1862 by Ferdinand von Mueller who gave it the name Trichinium aervoides in his Fragmenta Phytographiae Australiae from specimens collected during the Francis Thomas Gregory expedition of 1861.

[8] Mat mulla mulla is widespread in the north-west of Western Australia, and occurs in the Central Ranges bioregion of South Australia and in the Burt Plain, Finke, Little Sandy Desert, MacDonnell Ranges and Simpson Strzelecki Dunefields bioregions of southern Northern Territory.

[4] This species of Ptilotus is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions,[4] but as "near threatened" under the Northern Territory Territory Parks and Wildlife Conservation Act.