Description: An aquatic plant of deep water in acid lakes; the stems and leaves are floating. Similar to S. natans but generally bigger, with (usually) 2 globular male heads and with a long bract to the lowest female head.

All names: Sparganium angustifolium Michaux; Sparganium affine Schnizl.; Sparganium natans auct.

Distribution Map from NBN: Sparganium angustifolium at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Sparganium angustifolium at iNaturalist World Species Observations database.