This vegetation type is dominated by Lemna turionifera, a tiny plant freely floating on the water surface. Its stands are usually monospecific or mixed with other lemnids. Sometimes, especially in autumn, the stands of L. turionifera have a purple colour. Lemna turionifera is a neophyte of North American origin, which was first recorded in the Czech Republic in the 1990s. This association has been recorded at a few sites with shallow still water, but its distribution in the country is probably larger than recorded, because L. turionifera may have been mistaken for L. minor at many sites.