Rather stout medium to tall hairless plant with short creeping rhizomes. Leaves basal, linear and rush like, triangular below, sheathing at the base and somewhat twisted. Flowers pale to bright pink, with darker pink veins, cup shaped 16 to 26 mm, borne in long stalked umbel overtopping the leaves. Sepals 3 slightly shorter than the petals. 9 red stamens.

Indicator Species - Leicestershire, Leicester & Rutland Local Nature Recovery Strategy.

Standing in or beside water, around ponds canals etc.

July to August.

Perennial.

Widespread in England, not well recorded in Wales or the north of Scotland.

Local in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 55 of the 617 tetrads.