Genus: Polygonum

Norwegian name: Tungrasslekta

Systematics :

KingdomPlantae
Artificial group Vascular plant (Tracheophytes)
Superphylum  Spermatophyte
Phylum   Magnoliophyta
Subclass    Magnoliidae
Family     Polygonaceae
Genus      Polygonum
Species       Polygonum oxyspermum
Species       Polygonum bellardii
Species       Polygonum patulum
Species       Polygonum raii
Subspecies        Polygonum raii subsp. norvegicum
Subspecies        Polygonum raii subsp. raii
Species       Knotgrass (Polygonum aviculare)
Subspecies        Polygonum aviculare subsp. aviculare
Subspecies        Polygonum aviculare subsp. boreale
Subspecies        Polygonum aviculare subsp. excelsius
Subspecies        Polygonum aviculare subsp. microspermum
Subspecies        Polygonum aviculare subsp. neglectum
Subspecies        Polygonum aviculare subsp. rurivagum