db-RDA plot of samples of the tall-herb communities of the Sudetes Mts. and their foothills (SW Poland) overlaid with environmental variables. Symbols indicate alliances: circles: Petasition officinalis (1: Geranio phaei-Urticetum, 2: Petasitetum hybrydi, 3: Chaerophylo hirsuti-Petasitetum albi; 4: Prenanthetum purpureae); triangles: Rumicion alpini (5: Rumicetum alpini); diamonds: Calamagrostion villosae (6: Poo chaixii-Deschampsietum, 7: Athyrietum filicis-feminae, 8: Crepido conyzifoliae-Calamagrostietum); squares: Adenostylion alliariae (9: Cicerbitetum alpinae).