Tufted perennial 700 mm high; rhizome long, thin; lowest culm node bulbous; 'bulb' spherical, whitish, not polished/shining, well separated on rhizome. Leaf blade 60-350 x to 8 mm, rolled, sometimes expanded, marginal nerve usually not prominent or undulate, ascending. Spikelet 7-10 mm long; glumes ± equal, shorter than spikelet; sterile lemmas similar in texture, equal in length; 1st sterile lemma transversely ribbed throughout; 2nd sterile lemma broadest at middle, inrolled below; anther 2.5-4.0 mm long.
Spreading perennial to 70 cm, culm base swollen, whitish, matt, globose. Leaves linear-lanceolate, margins undulate. Spikelets in a verticillate panicle, straw-coloured and purple, glumes shorter than spikelet, sterile lemmas corrugate, glabrous, keel sometimes bristly, bilobed, with a straight awn, the second constricted at base.