Phylogenetic relationships among species of Mimosa (Legumminosae) based on cpDNA.

BESSEGA C.; HOPP H. E.; FORTUNATO R. H.

Austria, Vienna

Congreso; XVII INTERNATIONAL BOTANICAL CONGRESS; 2005

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Phylogenetic relationships among 26 southamerican species of genus Mimosa were analyzed on the basis of both the intron and the intergenic spacer TrnL-TrnF in order to clarify taxonomic assignments based on morphological characters. Seven species representing related genera were also sequenced and analyzed. The basic data matrix included 1137 characters. A total of 144 equally parsimonious trees were retrieved (633 steps, IC=0.66 and IR=0.59). The consense tree showed that Mimosa might be a monophyletic group sister to genus Piptadenia. These preliminary results indicate that two groups can be distinguished within Mimosa: one of them includes species of the section Batocaulon DC. and the other one species of the sections Habbasia DC., Mimosa and Caulothanmus Barneby. The latter might be sister to Scrankia, now recognized in the synonymy of Mimosa. Finally, the species of the section Caulothanmus studied here did not group within the same clade suggesting that this section in not a natural group.