Figure 2

Estimated divergence times within African Annonaceae. Maximum clade credibility chronograms, with nodes represented by their mean ages estimated under a relaxed lognormal uncorrelated molecular clock assumption. East African endemic taxa are indicated in blue, West and Central African taxa in red, taxa endemic to Madagascar in black. Solid circles indicate nodes used for calibration of the trees. Open circles indicate nodes for which divergence dates were estimated. Thick branches lead to nodes with more than 0.95 posterior probability support. Geological Epochs, shaded bars: Paleo., Paleocene; Oligo., Oligocene; Pli., Pliocene; Pleis., Pleistocene. (A) Genus-level chronogram showing phylogenetic relationships within the African clade. (B) Species-level chronogram of the two sister genera Isolona and Monodora. (C) posterior distributions of the estimated ages. The 95% highest posterior density (HPD) intervals are indicated with black bars and given between brackets after the mean. These distributions were used to accept or reject significant congruence of node ages.