(Michx.) Roem. & Schult.
Eleocharis quadrangulata is a species of spikesedge known by the common names square-stem spikerush and four-angled spikerush. It is native to eastern and central North America (from Texas and Florida north to Ontario and Massachusetts), with additional populations in California, Oregon, and west-central Mexico (Durango, Jalisco, etc.). 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.
- Kew World Checklist of Selected Plant Families
- Flora of North America, Eleocharis quadrangulata (Michaux) Roemer & Schultes in J. J. Roemer et al., Syst. Veg. 2: 155. 1817.
- Biota of North America Program, 2013 county distribution map
- McVaugh, R. 1993. Cyperaceae. 13: 225–440. In R. McVaugh (ed.) Flora Novo-Galiciana. The University of Michigan, Ann Arbor
- Espejo Serna, A. & López-Ferrari, A.R. (1997). Las Monocotiledóneas Mexicanas una Sinopsis Florística 5: 1-98. Consejo Nacional de la Flora de México, México D.F..
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