Appendix S1 Review of all the sampled populations of Myrtus communis and M. nivellei, with their precise location and their GPS coordinates.

Appendix S2 (a) List of the sites where Myrtus palaeobotanical occurrences were found, with associated references, and (b) chronozone reminder based on the geological timescale edited by The Geological Society of America (2009).

Appendix S3 (a) List of haplotypes of Myrtus communis and M. nivellei obtained by performing cpDNA and nrDNA sequencing, together with their GenBank accession numbers, (b) references and GenBank accession numbers of Myrtaceae sequences included in the matrix of alignment for the nrDNA phylogenetic study, and (c) table of cpDNA haplotypes of Myrtus communis and M. nivellei with the variable sites detected.

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