Synonymous substitution rates (d
) for five mitochondrial genes in Alismatales. Synonymous substitution rates (dS) calculated using the program HyPhy ver. 0.9 with the MG94×HKY85_3 × 4 codon model and using one of the two trees obtained by the parsimony analysis for the combined data set. All trees are drawn at the same scale. The outgroup was removed from the figure to save space. Clades marked as HH, EE, and ALB correspond to likely insertions of processed paralogs in nad5 (see text).