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Box plot of the monoploid genome size (1Cx DNA) in Allium oleraceum cytotypes from the western (‘W’) and eastern (‘E’) part of the European range. The border between the regions was set arbitrarily at 8°E. Note that triploids occur only in eastern Europe and the hepta- and octoploids only in western Europe. Those means not significantly different at P ≤ 0·05 are indicated by the same letter (Tukey's HSD test).
