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Tufted or mat-forming perennial 150-400 mm high; older plants form large rings dying off in the centre; basal sheaths white, shiny, persistent; leaves cauline; glands absent. Leaf blades 150-300 x 1 mm, rolled, rigid, sparsely hairy at base on upper surface, apex pungent; margins smooth; sheath mouth glabrous. Inflorescence open, 70-90 x to 50 mm, with 30-60 spikelets; pedicels scaberulous; axils sparsely to densely hairy. Spikelet 7.5 mm long; glumes acute to acuminate, pale green; lemma 2.3-3.0 mm long, hairs scattered; central awn 8 mm long, geniculate, column twisted; palea glabrous; anthers 2.1-2.8 mm long.
Cushion-forming perennial, 150-400 mm tall, forming `fairy rings' at maturity, without glands. Leaves placed on stem, 40-200 mm long, rolled, rigid, with pungent apex; ligule a fringe of hairs. Inflorescence 70-90 mm long; pedicels mostly erect, glabrous, but nodes hairy. Spikelets up to 7.5 mm long, 2-flowered, both bisexual; glumes ± equal, longer than spikelet (excluding awns), 1-nerved, glabrous; lemma with scattered hairs, awns of lobes not exserted; central awn 8 mm long, basally twisted; anthers 2.1-2.8 mm long.
Perennial cushion or ring-forming plant to 50 cm tall. Leaves rolled, rigid, spiny. Inflorescences paniculate, glumes 6.5-7.5 mm long, awns to 8 mm long.
