Potamogeton perfoliatus · permautalapė plūdė

EN · claspingleaf pondweed, perfoliate pondweed, redhead grass DE · Durchwachsene Laichkraut LV · skaujošā glīvene PL · rdestnica przeszyta

https://en.wikipedia.org/wiki/Potamogeton_perfoliatus It is widely distributed globally, occurring in all continents except South America and Antarctica. P. perfoliatus grows in a wide range of freshwater habitats including lakes, rivers and streams, large ponds, canals and larger drains and ditches. It does not tolerate drying out, and the most robust plants tend to occur in >1 m water depth.