Laharpe Densely cespitose; stems rather soft, to 1 m, rather coarsely ridged-sulcate with 10–20 ridges, the epidermal cells over the ridges enlarged; basal sheaths to 2 dm, bladeless, mostly dark reddish-brown or blackish; invol lf 10–20 cm, appearing like a continuation of the stem; infl apparently lateral, many-fld, open to fairly compact, mostly 1.5–6+ cm wide; fls prophyllate; tep 2.5–3.5 mm, pale brown, rigid, lanceolate, long-acuminate, ± closely investing the fr, the outer a little longer than the inner and often loose or slightly spreading at the tip; anthers 3; fr trilocular, shorter than to about equaling the tep, broadly obtuse or rounded to truncate or retuse at the tip, usually not mucronate; 2n=40. Wet, boggy or sandy, rather low-nutrient soils; Nf. to Minn. and sw. Mont., s. to N.C. and Ind. (J. effusus var. p.)
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