Fig. 1

Sampled populations of 51 species of Knautia sect. Trichera. Population identifiers, which correspond to Additional file 1: Table S1, are underlined for tetraploid populations and white with black shading for hexaploid populations. Diploid populations are not highlighted. a distribution of diploid and polyploid taxa outside of the area enlarged in B and C; b distribution of diploid taxa modified from Rešetnik et al. [24]; c distribution of polyploid taxa. Taxa of the exclusively diploid sections Knautia and Tricheroides are not shown