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Shaded bogs, wet woods.
Circumboreal, south to PA, IN, MN, UT, and CA.
Stems soft, slender, to 40 cm, scattered on slender, branching rhizomes. Leaves flat, to 2 mm wide. Spikes 2-5, sessile, 3-6 mm; staminate flowers terminal, 1-3; perigynia 1-4; bract lacking or filiform to 2 cm; scales triagular-ovate, stramineous to white-hyaline, midrib green, typically shorter than the perigynia; perigynia ellipsoid, 2-3 mm, white-punctate, nearly round in cross-section, with 2 strong nerves at the margins, beak minute (0.2 mm). Achene thick, lenticular, filling the perigyniuym, the style base semipersitent as a slender apiculus.
Flowers June to July
Wetland indicator: Obligate
The specific epithet refers to the tendency for the perigynia to be borne in pairs on the spikes.
Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of
Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY
Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.
© Michael Hough 2010