Spartina pectinata is a species of cordgrass known by the common names prairie cordgrass, freshwater cordgrass, tall marshgrass, and sloughgrass. It is native to much of North America, including central and eastern Canada and most of the contiguous United States except for the southwestern and southeastern regions. Its distribution extends into Mexico. It is also present on other continents as an introduced species. Livestock may graze on this plant when it is young, but once it matures it becomes very coarse and unpalatable. This species has been investigated as a possible source of biofuel.