Juncus covillei

Juncus covillei is a species of rush known by the common name Coville's rush native to North America. 
Distribution.
It is native to western North America from British Columbia to Idaho to California, where it grows in moist habitat, often in forested areas. 
Description.
This is a perennial herb forming clumps of erect stems up to about 25 centimeters tall from a thick rhizome. The inflorescence is made up of several clusters of brown or green flowers.