Mostly 25–80 cm tall; rhizome ±long-noded, creeping, c. (3–) 4–6 mm in diam.; stems in loose to subdense rows. Cataphylls usually 3, c. 6–12 cm long, abaxially dull stramineous distally, yellowish pale brown, ±dull proximally (later becoming almost blackish), adaxially stramineous-silvery. Stem 1.5–3.0 mm in diam., terete, ±light green to mid-green, rigid; pith initially of rounded astericiform cells. Lower bract usually c. 7–17 cm long, 1/5–1/3 as long as the stem. Inflorescence diffuse, (5–) 25–60 (–c. 80)-flowered; main branches straight, c. 0.5–0.8 mm in diam. Bracteoles ovate, acute, to c. 1.5 mm long, stramineous to pale castaneous. Tepals subequal, lanceolate. Outer tepals ±acute, (3.2–) 3.7–4.0 (–4.7) mm long; central band greenish, distinct, bordered deep castaneous; margins narrow or absent. Inner tepals slightly shorter, acute to mucronate, with distinct membranous margins. Anthers c. 1.1–1.5 mm long, 1.5–2× as long as filaments; filaments c. 0.4–0.6 mm long; style 0.7–0.9 mm long; stigmas c. 1–2 mm long. Capsule oblong-ovoid, trigonous, acute with mucro 0.2–0.3 mm long, pale brown to pale castaneous, c. 3.3–3.8 mm long, usually ±exceeding perianth. Seeds ovoid, c. 0.7–1.0 × 0.35–0.4 mm, pale brown, faintly reticulate. 2n = 80, 84, fide Ö.Nilsson & S.Snogerup, Bot. Not. 124: 315 (1971) [uncertain counts].