Juncus acuminatus is a species of rush known by the common names tapertip rush, tufted rush and sharp-fruited rush. It is native to North and Central America, where it can be found in and around water bodies from central Canada to Honduras. It is a rhizomatous perennial herb forming clumps up to about 80 centimeters tall. The inflorescence is an open array of many clusters of up to 20 flowers each.