Eleocharis montevidensis is a species of spikesedge known by the common name sand spikerush. It is a widespread coastal plant native to the Americas. It grows in moist, sandy spots in many habitat types, including lakes, riverbanks, wet meadows, and springs. It has a disjunct distribution, in North America (southern United States from California to the Carolinas, Mexico, Guatemala, Honduras) and South America (Brazil, Peru, Argentina, Uruguay).

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