Potamogeton obtusifolius

Systematics :

Kingdom: Plantae
Artificial group: Vascular plant (Tracheophytes)
Superphylum: Spermatophyte
Phylum: Magnoliophyta
Class: Liliopsida
Family: Potamogetonaceae
Genus: Potamogeton
Species: Potamogeton obtusifolius

Other names: butt tjønnaks

Norwegian name: Butt-tjernaks