Eleocharis quadrangulata (Michx.) Roem. & Schult.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Cyperaceae
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Scientific Name
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Description
Species Description - Cespitose and rhizomatous perennial; stems stout, to 1 m, 2–6 mm thick, sharply quadrangular; spikelet cylindric, (1.5–)2–5 cm, about as thick as the stem; scales in 4 rows, elliptic to obovate, 5–6 mm, broadly rounded, scarious-margined; bristles equaling or surpassing the achene; style bifid or trifid; achenes biconvex, obovoid, brown, 2–3 mm, constricted to an urn-shaped neck, marked with vertical rows of transversely elongate cells; tubercle dark, flattened, a third to half as long as the achene. Shallow water; Mass. to Wis., s. to Fla. and Mex., commoner southward.