Potamogeton gramineus
Systematics :
Kingdom: Plantae
Artificial group: Vascular plant (Tracheophytes)
Superphylum: Spermatophyte
Phylum: Magnoliophyta
Class: Liliopsida
Family: Potamogetonaceae
Genus: Potamogeton
Species: Potamogeton gramineus
Other names: grastjønnaks
Norwegian name: Grastjernaks