Sword-sedges are perennial sedges occurring in heaths and moist sites. Plants are tufted, spreading by creeping rhizomes. The erect stems and leaves are very similar in appearance and length, with all leaves basal and sometimes flatter than stems. Flowers are terminal panicles with the lowest bract sheathing the base of the panicle. The fruit is a nut, surrounded by 6 thickened whitish scales. The sword or rapier-shape of the leaves is the distinguishing characteristic.