@ARTICLE{TreeBASE2Ref16008, author = {Richard W Jobson and Melissa A. Luckow}, title = {Phylogenetic Study of the Genus Piptadenia (Mimosoideae: Leguminosae) using Plastid trnL-F and trnK/matK Sequence Data}, year = {2007}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Systematic Botany}, volume = {}, number = {}, pages = {}, abstract = {We undertook a phylogenetic study of the genus Piptadenia with an increased sample of 18 of ca. (Lewis 11) 27 recognized species using DNA sequences from the plastid trnK/matK- and trnL-F regions. Parsimony jackknife results support the hypothesis that Piptadenia is polyphyletic and that there are three independent lineages. The largest group of species forms a monophyletic lineage that is sister to Mimosa and corresponds closely to Piptadenia section Eupiptadenia sensu Barneby. Three species (P. obliqua, P. moniliformis, and P. leucoxylon) of section Pityrocarpa are sister to species of Pseudopiptadenia in a lineage with Parapiptadenia, Microlobius and Stryphnodendron. Piptadenia viridiflora is (Lewis 2) only distantly related to either section Eupiptadenia or Pityrocarpa. Section Eupiptadenia is characterized by the presence of prickles (aculei), a potential synapomorphy linking it to Mimosa, and exserted, racemose or paniculiform inflorescences of aggregated spikes. Piptadenia viridiflora has stipular spines and 1-2 axillary, spicate primary inflorescences. Species of section Pityrocarpa are unarmed trees (sometimes with hardened, persistent stipules) whose flowers have recurved petals and an ovary on a long gynophore. Based on our results, we recommend that Piptadenia viridiflora be recognized as a new genus, and that Piptadenia be restricted to other species of section Eupiptadenia. We resurrect the generic name Pityrocarpa to encompass the Pityrocarpa clade and make the following new combinations: Pityrocarpa moniliformis, Pityrocarpa obliqua ssp. brasiliensis, and Pityrocarpa leucoxylon.} }

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