Juncus orthophyllus is a species of rush known by the common name straightleaf rush. It is native to western North America from British Columbia to California and Nevada, where it grows in moist spots in mountain habitat, such as meadows. This is a perennial herb producing stems up to about half a meter tall from a tough, creeping rhizome. There are several flattened leaves around the stem bases, and sometimes one or more smaller leaves on the stem.