Perennial herb, tufted or long-rhizomatous, 0.2-0.4(-1.0) m high, stoloniferous. Leaf blades rigid, crescentiform (C-shaped), up to 1 mm wide, or lax, flattened, up to 4 mm wide. Culm ridged, terete, 1.0-1.5 mm in diam. Inflorescence a terminal, compact, obovate to globose, dark reddish black head, 8-11 x 7-11 mm. Subtending bracts 2-5, erect to spreading, with dilated bases enveloping 1/2-2/3 of inflorescence, and rigid leaf-like apex up to 40 mm long. Spikelets ovate, ± 6 mm long. Glumes ovate, ± 4 x ± 2 mm, apex obtuse, recurved, keel excurrent. Flowering time Aug., Sept., Nov. Nutlet obovate, including gynophore 1.8-2.0 mm long, faintly 3-angled, surface smooth to minutely reticulate. Gynophore small, margins lobed or lobes absent.
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Tufted, frequently `stoloniferous' perennial, 100-400 mm (-1m) tall. Leaf sheaths frequently reddish, blades well developed, hemicylindrical, 1 mm wide or flattened, up to 4 mm wide. Inflorescence a terminal, broadly ovoid head, 8-11 x 7-11 mm, basal bracts erect to spreading, rigid. Spikelet glumes chestnut-brown.
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