Stems: weak from matted rootstock. Leaves: ligule, conspicuous. Flowers: a solitary, many-flowered head, perianth segments dark brown, ovate-lanceolate, the outer ones aristate-acuminate. Fruit: many-seeded, apiculate at each end.

A swamp plant, with long, grass-like leaves, and a single, many-flowered head, which is found in wet meadows on high mountains. The pith from the stems of the Juncus was formerly used as wicks for the old-fashioned "rushlights."

Juncus triglumis, or Three-flowered Bog Rush, has all basal leaves with clasping sheaths, the blades short and blunt. The three-flowered head grows at the top of the stem.

Juncus Drummondii, or Drummond's Bog Rush, has very slender tall stems, and sheathing leaves. The panicle is greenish-brown.

Juncus Parryi, or Parry's Bog Rush, grows from three to ten inches high, and has inner leaf-bearing sheaths. The leaves are grooved at the base, and much shorter than the stems; while the panicle of inconspicuous blossoms is loosely-flowered, the floral leaves being tinged with brown.