Supplementary material for "Gene expression and drought response in an invasive thistle." To complement studies of phenotypic variation, we investigate gene expression during drought response that might underlie variation in drought tolerance between native and introduced populations of diffuse knapweed (Centaurea diffusa, Asteraceae), and possibly contribute to invasion success. Using species-specific microarrays and tissue sampled under drought and control conditions at three time points, we identified genes whose expression either varied constitutively or responded to drought stress differently between ranges. Further, we functionally investigate these genes. Full results from likelihood ratio tests. Similar to TableS3 but includes all contigs and model terms. Results from likelihood ratio tests (LRTs) are reported for each fixed effect term in mixed effect models of gene expression, for all 61,024 unigenes on the array. Q values corrected for multiple comparisons are reported for each fixed effect.