Plants annual; rhizomes absent. Culms 2–20 cm × 0.2–0.3 mm. Leaves: sheaths green to stramineous; distal blade mostly much longer than sheath, to 3 cm × 0.2 mm. Inflorescences: involucral bract 1, 3–10(–25) mm, rarely a second bract to 5 mm. Spikelets 2–8 × 1–1.5 mm; scales colorless, stramineous, or pale greenish, markedly gibbous, veinless or obscurely 3–7-veined, midrib keeled, finely reticulate at 40X, membranous, hyaline, apex rounded, mucronate, or awned; proximal scale to 1.5(–5) mm, awn to 3 mm; other scales 1–1.2 mm, apex, mucro 0.1 mm. Flowers: anthers 0.2 mm; styles 3-fid. Achenes often falling with and clasped by floral scales, whitish (or orange-brown when unripe), broadly ellipsoid to obovoid or outline subcircular, nearly equilaterally trigonous, faces convex, 0.7–0.9 × 0.5–0.6 mm, minutely papillose at 40X, papillae in many vertical rows or usually obscured by thick whitish surface layer.
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