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Perennial herb, long-rhizomatous, 1.37-1.98 m high. Leaves with sheaths glabrous or densely villous below mouth, mouth prolonged into deltoid-rounded tongue 2-5 mm long; blades unequally laterally praemorse distally, 6-16 mm wide. Culm nodose, glabrous below, hirsute above. Inflorescence paniculate. Subtending bracts foliaceous. Male spikelets sessile or subsessile, 3.5-4.0 mm long, glumes pale brown with reddish striae, keels and distal margins hispidulous. Female glumes 3.0-3.5 mm long, glabrescent or hispidulous on keels and distal margins, pale brown with darker reddish streaks. Flowering time Dec., Jan. Nutlet ovate to broadly elliptic, 2.3-3.5 mm long, shining, violet or purple, surface glabrous, smooth. Hypogynium obscurely 3-lobed with fimbriate margins, brown.
