This vegetation type is represented by submerged aquatic stands of Hippuris vulgaris in deep water and emergent stands in shallow water or on exposed bottoms. It occurs in fishponds with calcium-rich and in some cases also brackish water. In the Czech Republic it occurs at a few sites in warm areas, but this is probably due to the rare occurrence of mineral-rich wetlands in cooler parts of the country. Outside the country it also occurs in cool areas. The number of localities in the Czech Republic has decreased due to eutrophication and the spread of competitively stronger wetland plants during recent decades.