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In the shallow-water moat of a poor fen on a floating mat.

Leaves triangular in cross-section. Inflorescence unbranched. Heads frequently supra-axillary and opposite the bract above. At least the distal heads clustered. Consistently with only a single staminate head.

S. emersum is similar but has more staminate heads. Flora of North America also notes that the fruit of S. emersum has beaks 2-4.5mm long versus 1.5-2mm in S. glomeratum.

It would seem that this species has not been recorded for Langlade Co.