Figure 6

Principal coordinate analysis of morphologically identified plants as Rumex obtusifolius (cross), R. longifolius (open circle) and the hybrids (solid circle).
Blue and red symbols indicate reproductive and non-reproductive individuals, respectively. Symbols with sample numbers are the individuals that are not included in the own cluster of the species. Three genetic clusters (circles marked as I, II and III) were supported by the cluster analysis with the complete linkage method.