Juncus triglumis; The Three-flowered rush is comon on Iceland. It is a rather small rush which has 3 to 4 flowered heads on inflorescence stalks. The bracts around the flowers are smaller than the flower groups. As such, the species differs from the Two-leaved Rush (this species has a a bract just topping the inflorescence) and the Chestnut Rush (this species has bract about twice the size of the inflorescence). Juncus triglumis, the Three-leaved Rush often grows in moist rocky terrains.
It is a member of the rush family (Juncaceae).