Figure 3.

The evolution tree of pollination by shelter mimicry and sexual deception in orchids (Serapias and Ophrys) and irises (section Oncocyclus of the genus Iris). Grey branches indicate species pollinated by shelter mimicry; black branches indicate species pollinated by sexual deception and white branches indicate species with another pollination strategy. The arrows indicate species with an alternative pollination strategy (sexual deception in Serapias lingua and Iris paradoxa; shelter mimicry in Ophrys helenae). Most likely reconstruction of ancestral pollination strategies are shown on a most parsimonious tree of Serapias, adapted from Chittka & Kevan [47], a maximum-likelihood (ML) tree of Ophrys and an ML tree of Iris focusing on the section Oncocyclus (branch leading to Oncocyclus species indicated with an asterisk). The relative likelihoods of alternative ancestral pollination strategies are indicated on backbone branches. In each of the three examples, the likelihood of the dominant colour exceeded 0.90. Bootstrap values >50 and posterior probabilities >0.70 are indicated above branches.