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Tufted perennial 400-1 000 mm high; rhizome long; lowest culm node bulbous, 'bulb' cylindrical, orange, polished/shining. Leaf blade 50-220 x to 10 mm, expanded, spreading, with thickened undulate marginal nerves. Spikelet 8-12 mm long; glumes ± equal, shorter than spikelet; sterile lemmas similar in texture; 1st sterile lemma as long as 2nd sterile lemma, transversely ribbed only in lower 1/2 or 1/3; 2nd sterile lemma broadest at middle, inrolled below; anther 3.2-5.5 mm long.
Spreading perennial to 1 m, culm base swollen, yellow, shiny, elongate. Leaves linear-lanceolate, margins thickened, undulate. Spikelets in a verticillate panicle, straw-coloured and purple, glumes shorter than spikelet, sterile lemmas corrugate, glabrous, mucronate to aristate, the second constricted at base.
