Bayesian cladogram inferred from nuclear rDNA ITS and chloroplastic region MatK sequences of Alnus spp. Numbers above branches are posterior probability scores. Numbers circled at the internodes are age in million years (My) estimated with Bayesian analysis implemented in BEAST software. The divergence between Alnus and Betula was assigned with an age of 95 to 105 My.
Rochet et al. BMC Evolutionary Biology 2011 11:40 doi:10.1186/1471-2148-11-40