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Perennial herb, tufted or with short row of sheathed culm-bases, 0.2-0.5 m high. Leaf blades 2-4 mm wide. Culm scapose, 3-angled, 1.0-1.2 mm in diam. in middle. Inflorescence of 1-3 dense spikes; central cylindric, 8-16 x 5-7 mm; lateral small, globose to cylindric. Subtending bracts 3 or 4, leaf-like. Spikelets many, broadly ovate, 2.47-2.52 mm long, 1-flowered. Glumes: fertile with keel wingless, smooth or with 1 or 2 hairs, lower glume with keel slightly excurrent. Flowering time Apr. Nutlet broadly obovate with truncate apex, yellow to red-brown, later black.
Perennial (?) with a short lignose fragrant rootstock, cespitose, culms 1-3 cm. high,-slender; leaves shorter than the culms, 2-3 mm. wide; heads 1-3, ovoid or cylindric, 6-12 mm. long; bracts 3-4, spreading to reflexed, up to 6 cm. long; spikelets 3-3.5 mm. long; scales subacute, opaque, the keel smooth and sometimes with yellowish glands.
Perennial herb, up to 0.54 m high. Central spike 8-16 mm long. Keel of glume wingless, glabrous or with 1 or 2 hairs. Anthers 2 per floret. Nut broadly obovoid, yellow when young, turning reddish brown and later black. Glumes white.
Spikes white, generally several with the central spike cylindrical and large; spikelets ovate, glumes clearly nerved
Tufted or with a short, slender rhizome, leafy
