Tufted perennial 200-500 mm high; basal sheaths purple; lowest 1 or 2 culm nodes bulbous, 'bulbs' fusiform, whitish, smooth, shiny. Leaf blade 40-150 x to 5 mm. Spikelet 9-13 x 3-4 mm; glumes unequal, 1/3 as long as spikelet; sterile lemmas similar, smooth, with long hairs on keels and margins; anther 5.2-6.5 mm long.
Spreading perennial to 15 cm, culm base swollen, white, shiny, elongate. Leaves linear-lanceolate, margins undulate. Spikelets in a verticillate, raceme-like panicle, green and purple, glumes shorter than spikelet, sterile lemmas smooth, glabrous to shortly villous, keel long-bristly, mucronate.