Juncus lesueurii is a species of rush known by the common names Lesueur's rush and salt rush (not to be confused with saltmarsh rush, J. gerardii). It is native to the western coast of North America from British Columbia to California, where it grows in freshwater and salt marshes, and near sand dunes. It is a rhizomatous perennial herb forming clumps of stems often well exceeding one meter in height. The inflorescence is a cluster of several greenish or brownish flowers accompanied by one cylindrical bract which looks like an extension of the stem.