This vegetation type is dominated by submerged species Potamogeton perfoliatus. It occurs in mesotrophic to eutrophic rivers, rarely also in flooded sand and loam pits, at water depths of 50–200 cm. In the past it was also recorded in some fishponds. It is typical of early stages of terrestrialization, which are characterized by a mineral bottom with stones and gravel. In the Czech Republic this is a rare vegetation type, occurring mainly in some sections of the Labe, Vltava and Ohře rivers.