Species: Juncus covillei var. covillei

Coville's Rush is a strongly rhizomatous, grass-like perennial with slightly flattened stems that are 5-20 cm tall. Leaves are clustered at the base with 2-4 on the stem. Leaf sheaths have membranous margins that project into a pair of appendages, or auricles, on either side of where the blade joins the stem. Usually 7 flowers are borne in 1-5 clusters at the top of the stem subtended by a leaf-like bract that is slightly longer than the inflorescence. Each flower is subtended by a single scale-like bract and has 6 dark brown perianth segments, or tepals, that are 3-4 mm long. The outer tepals are pointed at the tip, while the inner are rounded. There are 6 stamens, with the anthers about as long as the filaments. The narrowly egg-shaped capsule is 4-5 mm long and indented on top. Each seed is ca. 0.3 mm long and egg-shaped with a minute point at each end.