(Engelm.) S.Watson, Proc. Amer. Acad. Arts 14: 303 (1879)
Perennials, 5–70 cm tall, rhizomatous, loosely caespitose. Rhizome stoloniferous, 1 mm in diam., not swollen, often densely branched. Cataphylls 1 or absent, maroon or stramineous, acute; basal leaves 1–3, 1.5–31 cm long; Cauline leaves 1–2, 1.5–31 cm long, laterally flattened to subterete, perfectly septate (septa visible in dry condition), unitubular, 0.5–1.5 (–2.0) mm wide; tip acute to acuminate; sheaths broadly bordered; auricles scarious, 1–3.2 mm long, rounded to acute. Lower bract leaf-like, linear, 1.5 cm long, shorter than the inflorescence, erect; other bracts reddish-green, lanceolate, 6–6.5 mm long. Inflorescence umbelloid to anthelate, of (1–) 4–8 (–11) heads, 2–18 cm tall, with erect to spreading branches; heads semiglobose to obpyramidal (rarely subspheric), 3–11-flowered, 5–14 mm in diam. Tepals subequal, lanceolate to broadly lanceolate, acute to acuminate, with tip subulate, stramineous-brown to dark castaneous-brown, rarely pale stramineous; outer tepals slightly longer, 2.8–6.2 mm; inner tepals 2.4–6 mm long; margins broad, membranous to scarious; central band greenish. Stamens 6, not exserted; anthers 1.0–2.0 mm long; filaments 0.4–0.7 mm long; style (0.7–) 1.0–1.8 mm long; stigmas 1.2–2.5 mm long. Capsules unilocular, ellipsoid, trigonous, acute below a c. 0.5 mm rostrum, 2.3–3.7 mm long, castaneous-brown, shorter than to slightly exceeding perianth. Seeds ovoid-ellipsoid, apiculate, 0.4–0.5 × 0.2 mm, brown, distinctly reticulate; appendages absent.