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The Cocktail method was applied to a small data set derived in a regional survey on riparian forest in the Polish part of the Sudetes. Formalised classification revealed the occurrence of seven associations. Considering the ecological character, three distinct groups emerged among them: i) alluvial forests (Salicetum albae, Alnetum incanae), ii) forests of small and medium mountain streams with only a narrow riparian zone (Salicetum fragilis, Stellario nemorum-Alnetum glutinosae and Fraxino-Alnetum) and iii) forests developed on waterlogged soils of spring-fed areas (Carici remotae-Fraxinetum and Piceo-Alnetum). The associations Salicetum fragilis and Piceo-Alnetum are reported for the first time from Poland. Analysis of GIS-derived environmental variables showed that average altitude, stream power index (SPI) and river order were significantly different among the associations, while there were no differences among average values of slope, solar radiation and topographic wetness index (TWI). Significant differences in species richness among the associations were also identified. Application of the Cocktail method in regional studies was also discussed.