Fig. 1From: Genetic origin and composition of a natural hybrid poplar Populus × jrtyschensis from two distantly related speciesDistribution of haplotypes within the three Populus species. a Median-joining network among plastid DNA haplotypes present in P. nigra, P. laurifolia and P. × jrtyschensis. Each sector of a circle is proportional to the frequency of each species in each haplotype. Colors of circles in (b) indicate the species present at a site. In (b) the sectors of circles indicate the frequency of a haplotype in a population at that siteBack to article page