Fig. 2From: RAD-seq reveals genetic structure of the F2-generation of natural willow hybrids (Salix L.) and a great potential for interspecific introgressionPrincipal coordinates analysis depicting the pairwise genetic distances among the 133 individuals in the sample. The first axis accounted for 12.7% of the total variance and the second axis accounted for 1.52%. BC, backcross; S.p., S. purpurea; S.h., S. helvetica; F2, F1 x F1 crossBack to article page