Figure 1.

Tempo of speciation in Isolona and Monodora. Maximum clade credibility chronogram, with nodes represented by their mean ages estimated from 9000 posterior trees and under a relaxed lognormal uncorrelated molecular clock assumption. Values at nodes represent posterior probabilities (PP) of the BEAST analysis. Nodes without values have PP of 0.8-1. Asterisks indicate nodes with less than 0.5 PP. Taxa in blue: West/Central Africa; Taxa in red: east Africa. A: Isolona cauliflora; B: I. heinsenii; C: I. cooperi; D: I. zenkeri; E: I. hexaloba; F: Monodora myristica; G: M. undulata; H: M. crispata; I: M. carolinae; J: M. globiflora; K: M. hasipetala. (Photos: TLP Couvreur, except G, C. Jongkind). Hol.: Holocene. DRC: Democratic Republic of Congo. Cam: Cameroon.