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An erect plant with a grey green matt looking stem bearing 12 to 30 strong longitudinal ridges. Inflorescence always compact and dark red brown.
Damp grassland, marshes, bogs and wet open woods.
June to August.
Fairly common throughout Britain.
Fairly common in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 278 of the 617 tetrads.
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