claim: Kate Walsh was on an NBC sitcom.
evidence: Potamogeton acutifolius is a European species of aquatic plant in the family Potamogetonaceae , known by the common name sharp-leaved pondweed .. Potamogetonaceae. Potamogetonaceae. Potamogeton. Potamogeton. aquatic plant. aquatic plant. It is threatened and declining in at least part of its range .