Stuckenia pectinata (L.) Börner  

Family: Potamogetonaceae

fennel leaf pondweed, more...sago pondweed

[Coleogeton pectinatus (L.) Les & R.R. Haynes, morePotamogeton livingstonei A. Benn., Potamogeton pectinatus L., Potamogeton pectinatus var. tenuifolius A. Benn.]