Schoenoplectus acutus (muhl. ex Bigelow) Á.löve & D.Löve

Rhizomes 5–15 mm diam. Culms cylindric, 1–4 m × 2–10 mm. Leaves 3–4, all basal; sheaths often dark reddish proximally, front membranous-translucent and splitting, orifice adaxially deeply V-shaped; blades 1–2, C-shaped to dorsiventrally flat in cross section, usually much shorter than sheath, distal blade 8–120 × 3–7 mm, margins often scabridulous. Inflorescences 2(–3) times branched, open or compact, branches 6(–18) cm; proximal bract usually erect, thickly C-shaped in cross section, 1–9 cm, margins sometimes scabridulous. Spikelets 3–190, solitary or in clusters of 2–8, never all solitary; scales reddish to orange-brown to straw-colored, often variable on same scale, usually wholly or partly straw-colored and prominently lineolate-spotted at 10X, scale or midrib often green when young, ovate, 3–4 × 2–3 mm, sparsely to often densely reddish or straw-colored spinulose-papillose distally or on most of surface, margins ciliate, hairs long, contorted, flanks veinless, apex acute to obtuse, notch 0.3–0.5 mm deep, awn on at least some scales in spikelet usually strongly contorted, 0.5–2 mm (often broken off). Flowers: perianth members (4–)6(–8), brown, bristlelike, equaling achene body or sometimes much shorter, rarely rudimentary, spinulose; anthers 2 mm; styles 2(–3)-fid. Achenes dark gray-brown, plano-convex or rarely weakly trigonous, obovoid, (1.5–)2–3 ´ 1.2–1.7 mm; beak 0.2–0.4 mm.

It is a temperate plant. It grows on the banks of streams, lakes and ponds.

The young shoots and tender roots can be eaten raw. They can be sliced and served in salads. The roots and shoots can be boiled and eaten. The young shoots can be boiled for several hours to make a sweet syrup. The seeds and pollen can be ground into flour. This can be used for biscuits.

It can be grown from seeds or by division of the clump.