A medium-tufted grass, approximately 40cm high. Common across the basalt slopes above the Werribee River in this location, although very much isolated from the larger populations in the Riverina and along the Murray River.
Open grassland species not uncommon on heavy basalt-derived soils. Flower heads are robust and 'chunky' looking, with spikelets enclosed within large straw-coloured glumes. Mature florets provide useful identification (see photos), with body of lemma turning golden brown (thus, Brown-backed Wallaby Grass). Lemma row of hair above callus (middle row) is variably complete, often hairs sparse across centre of the lemma surface. Awn strongly twisted and shining bronze colour.