Figure S1. References of previously published YABBY sequences used in the phylogenetic analyses.

Figure S2. Primers used in this study.

Figure S3. Nucleotide alignment of zinc finger and YABBY domains.

Figure S4. Numerical results for the 32 Bayesian analyses.

Figure S5. Amino acid alignment of coding regions.

Figure S6. Motifs identified in the amino acid sequence of YABBY genes.

Figure S7. References reporting expression data of YABBY genes used in ancestral character state inference.

Figure S8. Genetic divergence between the homologues of Eschscholzia californica YABBY-like genes.

Figure S9. Neighbour-joining tree based on the zinc finger and YABBY domain alignment of 93 homologous YABBY sequences.

Figure S10. Bootstrap consensus tree generated by the parsimony analysis.

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