This vegetation type is dominated by Hottonia palustris, which has submerged leaves and conspicuous flowers above the water surface. In habitats which dry out in summer this species occurs in a terrestrial growth form. It occurs in mesotrophic to eutrophic still water up to 50 cm deep, including in oxbows, alluvial pools, channels, periodically flooded ditches and sand pits. It is rare in fishponds. Occurrences are scattered throughout the warm areas of the Czech Republic.