ACKNOWLEDGEMENTS
We appreciate the contributions of Ron Zalesny, Andrew Elmore, and Steven Guinn for help with sample collections, Áki Láruson, Ben Haller, and Katie Lotterhos for discussions about testing genetic offset with common gardens, and Erin Landguth for help with CDPOP. This work was supported by National Science Foundation Plant Genome Research Program award #1461868 to SRK and MCF.