Eleocharis montevidensis is a species of spikesedge known by the common name sand spikerush. It is native to South America and as far north as the southernmost United States from California to the Deep South, where it grows in moist, sandy spots in many habitat types, including lakes, riverbanks, wet meadows, and springs. It is sometimes cultivated as an aquatic plant for water gardens. This is a rhizomatous perennial herb forming tufts or mats of erect, firm stems up to half a meter tall. The narrow grasslike leaves are dark purplish or reddish brown at the bases, becoming lighter in color toward the tips, and drying to a thin, papery texture. The flower cluster is an oval-shaped spikelet appearing at the tip of the stem. It is under a centimeter long and made up of several flowers covered in brownish leafs.