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Appendix S1 Discussion.

Table S1 Intergenic chloroplast spacer region primer sequences.

Table S2 Nuclear microsatellite loci primer sequences and annealing temperatures.

Table S3 Bold values of FIS indicate significant (< 0.5) deviations from Hardy–Weinberg proportions. n, number of individuals sampled.

Fig. S1 Sample size and location of populations and individuals included in this study.

Fig. S2 Distribution of collection dates for herbarium specimens included in this study.

Fig. S3 FIS for each discrete modern population correlates with longitude of sampling location.

Fig. S4 Mean individual inbreeding coefficients across the landscape.

Fig. S5 Per-locus estimates of null allele frequencies.

Fig. S6 Summary statistics of geneland runs.

Fig. S7 Maps of likelihood of assignment to one of two inferred clusters during the two time periods from geneland analyses.

Fig. S8 Maps showing the results of geneland runs with sampling density in the Northeastern region reduced by 50%.

Fig. S9 Results of structure runs on historical data set without using ‘sampling locations’ (modal cluster assignment from geneland) under the LOCPRIOR model with = 1–10.

Fig. S10 Likelihood results of structure runs on modern data set without using ‘sampling locations’ (modal cluster assignment from geneland) under the LOCPRIOR model with = 1–10.

Fig. S11 Likelihood results of structure runs on combined modern and historical data sets using ‘sampling information’ (modal cluster assignment from geneland) under the LOCPRIOR model with = 1–10.

Fig. S12 Results from structure with geneland cluster assignment as ‘sampling information’ priors.

Fig. 13 Spatial genetic clusters inferred by tess on the historical data set.

Fig. S14 Spatial genetic clusters inferred by tess on the modern data set.

Fig. S15 Comparisons of intra- and intercluster genetic distances within different geographical distance regimes in the (a) historical data set and (b) modern data set. Horizontal black bars indicate sample median.

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