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Invasive water plant?

Observed: 17th May 2013 By: JamesRiallJamesRiall’s reputation in PlantsJamesRiall’s reputation in PlantsJamesRiall’s reputation in Plants
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Description:

Great mat of this clogging up recently dredged ditch.

Identifications
Species interactions

No interactions present.

Species with which Fool's Water-Cress (Apium nodiflorum) interacts