Trichophorum clementis

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 12 cm 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 2 mm long.