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Fig. S1 Another analysis of the climatic data to select population though a PCA.

Fig. S2 Comparison between QST and FST.

Fig. S3 Correlation between climatic data from the world climate database and real climatic data from weather stations.

Table S1 Variance table from the model in Notes S2

Table S2 Geographical coordinates of populations growing in wet and dry trials

Notes S1 Exhaustive explanation of the comparison between QST and FST.

Notes S2 Another model formulation for the multi-site analysis to take into account the heterogeneous error variances between sites.