Supplementary files S1, S2, S3 and S4

Table S1: Summary of SIMPER results: average concentration of discriminating species in allopatric sites, their contribution (%) to dissimilarity between groups, and the accumulative total (%) of contribution (75% cut-off). Table S2: Table of compounds reported by CG-MS in the complex <em>Bursera bicolor</em> × <em>B. glabrifolia. </em> Table S3: Summary of SIMPER results: average concentration of discriminating taxa in La Tigra sympatric zone, their contribution (%) to dissimilarity between groups, and the accumulative total (%) of contribution (75% cut-off). Table S4: Summary of SIMPER results: average concentration of discriminating taxa in Quilamula sympatric zone, their contribution (%) to dissimilarity between groups, and the accumulative total (%) of contribution (75% cut-off).