Rytidosperma erianthum is an erect, densely tufted perennial up to 0.7 m (2 ft 4 in) high.

[2] Leaf blade fine, rolled in, or rarely almost flat, to 25 cm (9.8 in) long and usually less than 1 mm (0.039 in) wide.

Palea obovate in shape, the margin with conspicuous hairs, exceeding sinus by about 1 mm (0.039 in).

Rytidosperma erianthum was first described by the botanist John Lindley as Danthonia eriantha in 1838.

The holotype was collected by Major Mitchell, during his expedition of 1836 in present-day southern New South Wales.