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DescriptionAnnual or perennial herbs. Culms triangular. Inflorescence a single ovate or hemispheric head, sometimes more complex additional lateral heads. Spikelets with relatively few, 1-2 (-5) florets. Glumes distichous. Perianth 0. Stamens 1-3. Stigmas 2. Fruit a nutlet, cylindric or ellipsoid, laterally flattened, usually dark brown to black when mature.