Trichophorum clementis (syn. Scirpus clementis) is a species of flowering plant in the sedge family known by the common name Yosemite bulrush. It is endemic to the Sierra Nevada of California, where it is known from high-elevation mountain meadows and streambanks.

Description
It is a perennial herb forming a dense tuft of erect, ridged stems up to  tall. There are a few short, thick, hairlike leaves at the base. At the tip of each stem is the inflorescence, a clublike spikelet less than a centimeter long which is composed of a few tiny flowers. The flowers produce smooth dark fruits that are achenes no more than  long.

References

External links
Jepson Manual Treatment
Flora of North America
Photo gallery

clementis
Endemic flora of California
Flora of the Sierra Nevada (United States)
Plants described in 1912
Flora without expected TNC conservation status