The most parsimonious trees of Potamogeton based on (A) the combined plastid DNA (atpB–rbcL, rpl20–rps12, trnT–trnL, trnL, trnL–trnF) sequences and (B) nrITS sequences. Each one of the two outgroups is trimmed to clarify ingroup phylogeny. ACCTRAN optimisation is used for branch length measures; terminals are aligned with dotted lines. Numbers above the branches indicate bootstrap support (BP) calculated in the maximum parsimony, and those below indicate Bayesian posterior probabilities (PP). Samples in regular and bold face indicate comparative ones and those from Myanmar, respectively. Some accessions in each tree represent multiple identical accessions. Note that some samples have heterogeneous nrITS copies; for these, the sequence pairs are named #1 and #2, respectively, and colored in red.