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Maximum parsimony and Bayesian likelihood analysis of ribosomal DNA internal transcribed spacer (ITS) sequences from 55 samples representing 25 species, subspecies, and/or hybrids of Tropaeolum sect. Chilensia yielded a tree with a large proportion of well-supported nodes at the interspecific and intersubspecific level. However, the tree shows samples from two species, T.azureum and T. brachyceras...