Table S1. Summary of regions with significantly elevated divergence (q < 0.05). ln RH is shown before and after standardization.

Figure S1. Map of subpopulations included in the study, showing core and edge dune subpopulations.

Figure S2. Local mean FST (Gaussian smoothing, σ = 1 cM) and regions of significantly elevated divergence (P < 0.05) between dune and nondune ecotypes of H. petiolaris and between H. annuus and H. petiolaris (indicated by bars above plots).

Figure S3. Weir and Cockerham's FST (θ) between dune and nondune ecotypes (DN) and between H. annuus and H. petiolaris (AP), plotted for each SNP by map position on each linkage group with lines showing local means.

Figure S4. Associations of SNPs with percent grass cover, controlling for the association of the genomic background. Highlighted SNPs were significant with a false discovery rate-corrected threshold of 0.05.

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