Author Contributions:
HF Cooper collected trait data, performed genetic and statistical
analyses, and wrote much of the manuscript. LV Andrews helped with
RADseq processing. RJ Best contributed essential analysis of our results
and helped write the manuscript. KR Grady assisted with field
collections, and along with GJ Allan, CA Gehring, KR Hultine, and TG
Whitham, designed the common garden experiment. All authors provided
critical edits to the manuscript and figures.