Distribution: Widespread in the United States and adjacent Canada.
Habitat: Wet places, along the banks of large streams, in the valleys and lowlands.
Flowers: July - September
Conservation Status: Not of concern
Short-lived perennial without rhizomes, the sharply triangular, solitary or few solid stems 1-6 dm. tall.
Leaves several, grass-like, crowded at the base, 2-10 mm. wide, the sheaths closed.
Spikelets numerous, in short, cylindric spikes, spreading at right angles from the elongate rachis, 6-25 mm. long and 1-2 mm. wide; scales of the spikelets in two vertical rows, several nerved; axis of the spikelets with translucent wings that clasp the lower part of each achene; stamens 3; style trifid.
Achenes unequally triangular, 1.5-2 mm. long, 3-4 times as long as wide.