Fig. 6

Amplified Fragment Length Polymorphism (AFLP) variation in 251 populations of 51 species of Knautia sect. Trichera. Relationships are visualised as NeighbourNet diagram based on uncorrected P distances. Dots at the tips of branches indicate ploidy levels: white, diploid; grey, tetraploid; black, hexaploid. The colours of individual branches indicate the ten genetic clusters identified as optimal solution by K-means clustering. Nine groups, whose circumscription was additionally informed by the clustering of diploid accessions [24] and the topology of the NeighbourNet, are indicated by thick black lines. Species assigned to more than one cluster are highlighted with dots, whose colours reflect all clusters a species is assigned to. An enlargeable version of Fig. 6 with labelling of terminal splits is presented as Additional file 7: Figure S6