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Identification Distinguishing characteristics: 1 or 2 staminate heads abutting the upper pistillate head; achene shining. Flower characteristics: Inflorescence simple, occasionally with a basal branch; flowers unisexual; pistillate heads several, sessile 1.5 to 2 cm thick when ripe; staminate head solitary or sometimes 2, abutting pistillate heads below. Fruit characteristics: Achene brown, shining, fusiform body, 3 to 4 mm, slighly constricted below the middle, tapering to a straight or slightly curved beak 1.5 to 2 mm. Leaf characteristics: Flat or weakly keeled, 3 to 8 mm wide; bracteal leaves dilated at the base.
Plants found shallow water of a filled-in ditch through a restored fen. Associated species include Scirpus cyperinus and Carex chordorhiza. Approximately 25 square meters with 20 fruiting stems and many more non-fruiting.