Table S1. Locations of Senecio aethnensis, Senecio chrysanthemifolius, and their hybrids, sampled in natural populations from Mount Etna, Sicily.

Table S2. Primers for polymerase chain reaction amplification of Senecio genes.

Table S3. Variability overview of the 11 microsatellite loci surveyed among 45 individuals in Senecio taxa on Mount Etna, Sicily.

Table S4. AMOVA analysis of hierarchical population structure in Senecio aethnensis, Senecio chrysanthemifolius and their hybrids.

Table S5. Point estimates and 95% highest probability density intervals of parameter estimates obtained from IMa2 for Senecio aethnensis and Senecio chrysanthemifolius.

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