Rhizomatous, erect perennial, up to 0.6 m tall. Leaf blades flat, keeled, 3-5 mm wide. Stem 3-angled. Inflorescence of several, rounded, stalked clusters of spikelets, radiating from stem apex, basal bracts several, leaf-like, suberect with the largest often erect. Spikelets 1.2 mm wide, glumes dark red, often with a broad green keel.
Perennial to 60 cm. Spikelets dark red.