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Stems cespitose from a short rhizome, 3–8 dm; basal lvs very slender, terete or nearly so, to 3 cm; invol lf shorter than the infl or up to 5(–7) cm; infl obpyramidal, compact, 1–4 cm; fls prophyllate; tep lanceolate, acute or acuminate, appressed even at maturity, the sep 3.5–4.5 mm, the pet 3.2–4.2 mm; anthers 6, about equaling the filaments; fr trilocular, oblong-cylindric, 4.1–5.4 mm, truncate; seeds fusiform, becoming mucilaginous when wetted, the body 0.5–0.8 mm, each end with a slender pale appendage usually 0.2–0.4 mm; 2n=42. Moist, often sandy soil; N.S. to Sask. and B.C., s. to N.Y., Ind., Minn., and Colo. An apparent hybrid with no. 6 [Juncus tenuis Willd.], in Me., has been called J. ×oronensis Fernald.
