Potamogeton sp.
Systematics :
Kingdom: Plantae
Artificial group: Vascular plant (Tracheophytes)
Superphylum: Spermatophyte
Phylum: Magnoliophyta
Class: Liliopsida
Family: Potamogetonaceae
Genus: Potamogeton
Species (sp.): Potamogeton sp.
Norwegian name: Tjønnaks