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Phylogenetic relationship of the 19 species inferred from ML and BI analyses based on the 79-consensus protein-coding sequences. The bootstrap values of ML and Bayesian posterior probabilities of BI analyses are shown beside the node of clades. S. patulinervum and A. plantago-aquatica was used as the outgroups. C. gigantea, C. bicolor and X. sagittifolium were marked in bold characters and red branches
