Figure 2.

Comparative floral scent chemistry between shelter-mimicking and sexually deceptive species. Mean (± s.e.) relative amount (in % of the total blend) of n-alkenes (white bars) and n-alkanes (black bars) in the floral scent of all shelter-mimicking species (Iris atropurpurea, Ophrys helenae and Serapias cordigera) versus all sexually deceptive species (I. paradoxa, O. mammosa and S. lingua) investigated in this study. Different letters on top of error bars indicate significant differences (Mann–Whitney U-test, p < 0.05). See electronic supplementary material, figure S3 and table S2 for details on the floral scent chemistry.