Additional file 4.

Map showing the approximate distribution the 26 plastid haplotypes (H1-26) recognized across the temperate N Hemisphere. Pies indicate the proportion of haplotypes registered for individual taxa/cytotypes and the size of each pie correlated to the sample size from their generalized sampling areas.

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Guo et al. BMC Evolutionary Biology 2012 12:2   doi:10.1186/1471-2148-12-2