Fig. 2From: The phylogeographic structure of Hydrilla verticillata (Hydrocharitaceae) in China and its implications for the biogeographic history of this worldwide-distributed submerged macrophyteChronogram of Hydrilla inferred from trnL-F sequences using BEAST. Two clade constraints are indicated with blank asterisks. Grey boxes indicate the 95Â % highest posterior density intervals. The maximum likelihood bootstrap values of 70 and above (left) and the posterior probabilities of 0.95 and above (right) are shown at the nodesBack to article page