Fig. 4From: New insights into polyploid evolution and dynamic nature of Ludwigia section Isnardia (Onagraceae)Boxplots showing infraspecific nucleotide diversities (Tajima’s π) of different ploidy levels in Ludwigia sect. Isnardia based on (a) atpB-rbcL and (b) ITS data. Letters above each boxplot indicate pairwise statistical differences between ploidy levels. The complete details for the statistical analysis are shown in Additional file 5. The infraspecific nucleotide diversity of each taxon is available in Table 1Back to article page