Tufted perennial to c. 45 cm high; rhizome short. Stems ± terete, internal transverse septa lacking or barely discernible. Leaves terete or slightly compressed, transversely-septate across whole width. Inflorescence compact with a few large flower-clusters, or more open with many clusters. Stamens 6. Capsules c. 4.5 mm long, ± = tepals, triquetrous, somewhat tapered.