This vegetation type is dominated by Echinocystis lobata, an annual herbaceous liana, which is accompanied by tall herbaceous, both annual and perennial, nutrient demanding species. Echinocystis lobata is a neophyte of North American origin. Its stands occur in regularly flooded habitats in large river floodplains, at the banks of rivers, oxbows, pools or ditches, and around fishponds. The spread of Echinocystis lobata in river corridors is supported by floods and probably also by river regulations. This vegetation type is documented by relevés mainly from the Morava river floodplain in southern Moravia, but it also occurs in some other low-altitude areas of the Czech Republic.