Perennial by stout rhizomes; culms coarse, smooth, or the angles sometimes scabrous, sharply triangular, 1-3 m. high; leaves linear-lanceolate, 5-to 7-nerved, rigid, attenuate-acuminate, 2-4 dm. long, 1-4.5 cm. wide, smooth or somewhat roughened on the margins and veins beneath; inflorescence paniculate, terminal and axillary; hypogynium large, undulately 3-lobed, the margin more or less ciliate; achene subglobose-ellipsoid, white or discolored, smooth, shining, 3.5-6 mm. long, tipped with the somewhat persistent conic pale style-base.
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