Fig. S1 Distribution of quality metrics for genotyped single nucleotide polymorphisms (SNPs) grouped by dataset.

Fig. S2 Cluster assignments illustrated across pairwise plots of the four significant principal components (PCs) derived using principal components analysis (PCA).

Fig. S3 Summaries of population genetic parameters across all samples and samples placed into clusters.

Fig. S4 Differentiation among inferred genetic clusters for Populus trichocarpa reveals FST outliers within the set of focal single nucleotide polymorphisms (SNPs).

Fig. S5 Cluster assignment is correlated with phenotypic traits.

Table S1 Sample localities for the 448 individuals used for association mapping in Populus trichocarpa

Table S2 Summaries of quality scores across genotyped single nucleotide polymorphism(SNP) loci

Table S3 Summaries of genotyped single nucleotide polymorphisms (SNPs) for focal and control SNPs

Table S4 Genotype data

Table S5 Phenotype data

Table S6 Haplotype data

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