in W. H. Emory, Report on the United States and Mexican Boundary Survey, ... 2(1): 223. 1859.
Herbs, perennial, 2–6 dm. Rhizomes long creeping. Culms slightly compressed. Leaves: basal 2–5, cauline 1–3; auricles 1–2.5 mm, apex truncate to obtuse; blade flat, 1–3 dm × 1.5–3 mm, the cauline shorter. Inflorescences glomerules 1–4(–8), each with 3–12 flowers, open or aggregate, 2–6(–10) cm; primary bract shorter than inflorescence. Flowers: tepals brown with green midstripe, lanceolate, 5–6 mm, margins scarious, sometimes papillose; outer series slightly shorter; stamens 6, filaments 0.5–1 mm, anthers 1.2–2 mm; style 0.6 mm. Capsules tan, 3-locular, obovoid, 3–5 mm, shorter than perianth. Seeds ovoid, 0.4–0.6 mm, not tailed. 2n = 40.
Phenology: Flowering and fruiting summer.
Habitat: Moist ground in mountain meadows
Elevation: 1000–3300 m
Alta., B.C., Man., Nfld. and Labr. (Nfld.), Ont., Que., Sask., Ariz., Calif., Colo., Idaho, Mich., Minn., Mont., Nebr., Nev., N.Dak., N.Mex., S.Dak., Oreg., Utah, Wash., Wyo.