DNA sequence data reveal polyphyly of Brexioideae (Brexiaceae; Saxifragaceae sensu lato)

@article{Koontz2004DNASD,
  title={DNA sequence data reveal polyphyly of Brexioideae (Brexiaceae; Saxifragaceae sensu lato)},
  author={Jason A. Koontz and Douglas E. Soltis},
  journal={Plant Systematics and Evolution},
  year={2004},
  volume={219},
  pages={199-208}
}
Previous molecular phylogenetic analyses have demonstrated that Saxifragaceae sensu lato are polyphyletic, with component lineages scattered throughout the eudicots. As part of our effort to elucidate the relationships of members of Engler and Prantl's Saxifragaceae s. l., we undertook a molecular systematic study of subfamily Brexioideae, which comprises three genera:Brexia, Ixerba, andRoussea. Not all taxonomic treatments have concurred, however, in placing these genera together. To elucidate… 
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TLDR
The analyses indicate that Saxifraga is polyphyletic, comprising two welldifferentiated clades, and suggests that the floral features used to define Sax ifraga may simply be symplesiomorphic in these well-separated SaxIfraga lineages.
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