All files are tab-delimited text files with header row. SNP_genotype.txt Contains data from 23379 SNPs. Column 1: SNP names Column 2: Fst values Column 3 to 21: Genotype calls for 19 accessions, where aa represents homozygous reference-genome alleles, bb represents homozygous alternative alleles, ab represents heterozygotes, and -- represents missing data. Experiment1.txt All individual-level phenotypic values measured in experiment 1, including instantaneous water use efficiency (WUE), phenology, and stalk morphology. Column 1: 24 genotypes Column 2: Individual ID Column 3: Geography - Allopatric/Sympatric Column 4: Subspecies - East/West Column 5: Block Column 6: Treatment - Wet/Dry Column 7: The seconds of a day when WUE was measured Column 8: Light intensity in the WUE chamber Column 9 to 22: Phenotypic traits Experiment2.txt Phenotypic value of d13C (long-term drought experiment) measured in experiment 2. Column 1: 24 genotypes Column 2: Sample ID Column 3: Geography - Allopatric/Sympatric Column 4: Subspecies - East/West Column 5: Treatment - Wet/Dry Column 6: Three plates where samples were submitted Column 7: d13C value Experiment3.txt All individual-level phenotypic values measured in experiment 3, including rosette and leaf morphology. Column 1: 24 genotypes Column 2: Subspecies - East/West Column 3: Geography - Allopatric/Sympatric Column 4 to 25: Phenotypic traits