ML tree from mitochondrial atp1 . Phylogram obtained from ML analysis of the 71-taxon mitochondrial atp1 matrix. Clades with Bayesian posterior probabilities between 0.9 and 1.0 are indicated by thick lines. Rafflesiales taxa are shown in bold italics. Note that the clade with Apodanthes and Polemonium (asterisk) is poorly supported with a posterior probability of 0.54.