Fig. 5

Maximum likelihood phylogenetic tree of Saxifraga sect. Saxifraga (arrow) and representatives of other sections of Saxifraga based on nrITS Sanger sequences and NGS reads (reduced dataset). Micranthes nivalis was chosen as outgroup. Maximum likelihood and maximum parsimony bootstrap support values as well as posterior probabilities of Bayesian inference ≥50% are indicated on the branches. The Arabic numerals behind taxon names indicate different provenances listed in Additional file 1: Table S1. Letters A–D mean different variants of NGS sequences, if present, followed by the number of NGS reads (size). Taxon names without such letter and without number of reads are Sanger sequences. Numbering of the main clades is according to Table 1. The subsections mentioned in the main text are labelled on the right-hand side. The clade 10 is not resolved