Linnaea 22:385. 1849.
Rhizomes absent. Stolons to 4 cm; scale-leaves present; adventitious-roots present. Culms loosely cespitose, 10–30 cm × 0.5–3.5 mm. Leaves: sheaths reddish, throats pilose; blade sparsely pubescent; basal leaves 6–10 cm × 2–5 mm; cauline leaves 2–3, to 4 (–6) cm × 1–2.5 mm. Inflorescences simple or rarely branching; proximal inflorescence bract to 1/2 length of inflorescence; bracts brown, apex truncate, glabrous; bracteoles ovate, 1/2 length of tepals; pedicels spreading, 1–4 cm. Flowers: tepals brown, 1.6–2.5 mm, margins entire, clear; anthers 2 times filament length; stigmas 2 times style length. Capsules straw-colored, sometimes reddish, equal to or exceeding tepals; beak a mucro. Seeds dark-brown to black, 1.4 mm; caruncle erect to slightly curved, 2/3 length of seed body. 2n = 52 (Japan).
Phenology: Flowering and fruiting summer.
Habitat: Dry to mesic open montane forests and forest margins to borders of bogs, marshes, and river bars
Elevation: 0–1500 m
B.C., N.W.T., Yukon, Alaska, Asia
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