Amer. J. Sci. 159: 356. 1900.
Culms round or trigonous, filiform, wiry, angles proximal to spike blunt or sharp, 5–22 cm, ± equaling leaves. Leaves: basal leaf-sheaths only slightly fibrillose when old; blades bright green, involutecylindric, quill-shaped, 3–18 cm, 0.2–0.6 mm wide near base. Spike 8–20 × 2–5 mm; staminate portion 4–8 (–10) mm. Proximal pistillate scales pale redbrown or golden brown with white or gold margins, broadly obovate, 2–4 (–4.7) × 1.7–3.3 mm excluding awns, apex obtuse to awned. Staminate scales redbrown with white margins and pale midstripe, oblongovate, apex obtuse. Perigynia 3–9, appressed to ascending, white, usually with golden brown to redbrown area near beak and/or near base, obovate (or elliptic), 2.5–4.4 × 1.2–2 mm, body usually glabrous or sparsely hirsute near base of beak; beak 0.4–0.8 (–1) mm, style base not conspicuously exserted from beak; rachilla absent. Achenes obovate to ovate, 1.5–2.7 (–3) × (1–) 1.2–1.5 mm. Stigmas ± brown.
Phenology: Fruiting spring–summer.
Habitat: Meadows, dryish areas with subsurface moisture
Elevation: 100–3800 m
Colo., Idaho, Mont., Nev., N.Mex., Utah, Wyo.