Abstract
Premise of research. Despite recent progress on the systematics of the Leguminosae, the relationships between some genera, as well as their circumscriptions, remain uncertain. Here we investigate the relationships between Stryphnodendron and closely related genera in the Piptadenia group, a clade of problematic taxonomy for which a robust phylogenetic hypothesis is still lacking.Methodology. Taxonomic sampling included 23 species of Stryphnodendron (77% of the genus) and representatives of genera of the Piptadenia group. DNA (matK/trnK, trnD-trnT, trnL-trnF, and ITS) sequences constituting a data set with 6798 bp and 94 terminals were used in parsimony and Bayesian analyses. A set of 17 morphological characters were optimized on the estimated phylogeny to evaluate clade synapomorphies and character evolution.Pivotal results. Our increased molecular and taxonomic sampling improved the resolution of a previously largely unresolved clade that included Microlobius, Parapiptadenia, Pityrocarpa, Pseudopiptadeni...
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