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Perennial herb, tufted, robust, 1.0-1.8 m high. Leaf blades 6-18 mm wide, flat. Culm nodose, 3-angled, 2-3 mm in diam. just below inflorescence. Inflorescence an oblong panicle up to 300 mm long, individual units corymb-like, of dense clusters of many spikelets. Subtending bracts 1 per node, leaf-like but with margins scabrid. Spikelets lanceolate, 10 mm long, ± 4-flowered, lowermost flower bisexual, upper 3 male. Glumes: fertile lanceolate, ± 10 mm long, keel minutely excurrent. Perianth of (5)6 antrorsely scabrid light brown bristles longer than nutlet, persistent on nutlet after dispersal. Flowering time Nov. Nutlet elliptical, excluding style base 5 x 3 mm, biconvex (irregularly sulcate), brown, crowned with persistent overgrown whitish style base, surface minutely reticulate.
