Potamogeton
Systematics :
Kingdom: Plantae
Artificial group: Vascular plant (Tracheophytes)
Superphylum: Spermatophyte
Phylum: Magnoliophyta
Class: Liliopsida
Family: Potamogetonaceae
Genus: Potamogeton
Other names: tjønnaksslekta, tjørnaksslekta
Norwegian name: Tjernaksslekta