This association includes freshwater marshes dominated by Bolboschoenus laticarpus with an admixture of Phalaris arundinacea and some tall wetland graminoids. It is typical of large lowland rivers where it grows on gently sloping river banks, but also in oxbows, pools and channels. It is found in places with slowly running or still water, especially in places with fluctuating water table and periodic exposure of the bottom. In the Czech Republic this vegetation type has been documented mainly from the Labe river corridor, but it has been in decline in the past decades due to regulation of river flow.