(Michx.) Roem. & Schult.
Eleocharis quadrangulata is a species of spikesedge known by the common names squarestem spikerush and four-angled spikerush. It is native to much of North America from eastern Canada to southern Mexico, where it grows in and around freshwater in lakes and other water bodies. It is a rhizomatous perennial herb growing one half to one meter in height. The spongy, compressible stem is a few millimeters wide and sharply four-angled. The inflorescence is a single spikelet 1.5 to 7.5 centimeters long which is made up of several flowers covered in light brown bracts.
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