Fig. 3From: The phylogeographic structure of Hydrilla verticillata (Hydrocharitaceae) in China and its implications for the biogeographic history of this worldwide-distributed submerged macrophyteChronogram of Hydrocharitaceae inferred from combined 18S + rbcL + matK + trnK 5’ intron + rpoB + rpoC1 + cob + atp1 sequence data using BEAST. Three calibration points are indicated with blank asterisks. Grey boxes indicate 95 % 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