Ophrys annae Ophrys chestermanii Plant Functional Traits mean ± S.D. mean ± S.D. Plant height 13,8 ± 4,183 21,1 ± 6,52 First flower height 8,6 ± 2,56 15 ± 4,855 Inflorescence height 5,2 ± 2,166 6,1 ± 3,462 Flowers per plant 5,3 ± 2,028 3,2 ± 0,994 Fruits per plant 0,2 ± 0,41 0,5 ± 0,76 Flowers per population 5,3 ± 2,028 3,2 ± 0,994 Fruits per population 0,2 ± 0,41 0,5 ± 0,76 Fitness 0,04% 0,15% Table 1. Plant Functional Traits analyses: fitness per population was calculated as the percentage of ratio between number of fruits and number of flowers sexually mature.