Juncus ensifolius var. ensifolius
Leaves 2–15 dm ×x 3–6 mm. Inflorescences 1–5(–11) heads; heads usually globose. Flowers: outer tepals 2.7–3.6(–4) mm; inner tepals 2.2–3(–3.5) mm; stamens 3. Capsules included to slightly exserted, oblong-ovoid to ellipsoid, 2.4–3.5 mm. Seeds 0.4–0.6, not tailed. 2n = 40.
Phenology: Fruiting summer.
Habitat: Wet meadows, marshy areas, wet granite areas, shores, banks and ditches, often montane
Elevation: 400–3000 m
Alta., B.C., Ont., Que., Sask., Alaska, Calif., Colo., Idaho, Mont., Nev., N.Y., Oreg., S.Dak., Utah, Wash., Wis., Wyo., Mexico (s to Veracruz, Puebla, Guerrero), Europe, e Asia.
This species is probably introduced in Wisconsin and New York as well as in northern Europe.