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Citation for Study 1487

About Citation title: "Phylogeny and character evolution in the African clade of Podostemaceae".
About This study was previously identified under the legacy study ID S1431 (Status: Published).

Citation

Moline P., Thiv M., Ameka G., Ghogue J., Pfeifer E., & Rutishauser R. 2006. Phylogeny and character evolution in the African clade of Podostemaceae. International Journal of Plant Sciences, null.

Authors

  • Moline P.
  • Thiv M.
  • Ameka G.
  • Ghogue J.
  • Pfeifer E.
  • Rutishauser R.

Abstract

The African taxa of Podostemaceae are relatively poorly known. New matK sequence data for eight African Podostemaceae species of the genera <i>Dicraeanthus</i>, <i>Djinga</i> and <i>Ledermanniella</i> are combined with sequences representing all major groups in the family to test the placement of the African taxa in the family. All podostemoids studied from continental Africa form a clade that is sister to the Madagascan genera <i>Endocaulos</i> and <i>Thelethylax</i>. The sister of this African-Madagascan lineage is the American genus <i>Podostemum</i> and all Asian podostemoids. Important morphological transformations involving the African clade include the following: (1) A shift from erect to inverted flowers in the spathella is synapomorphic for the African podostemoids, although there is a reversal in <i>Djinga</i>. (2) Unilocular ovaries arising via septum loss may be synapomorphic for the African clade. (3) Crustose (i.e. foliose, disk-like) roots or very broad ribbons covering the rocky substrate like a carpet are derived characters of an African subclade consisting of <i>Dicraeanthus</i>, <i>Djinga</i> and certain members of <i>Ledermanniella</i>. (4) In several species such as <i>Dicraeanthus africanus</i> and <i>Ledermanniella letouzeyi</i> flowers arise endogenously along the stems and in <i>L. letouzeyi</i> even along the leaves, a character that has never been observed in any of the Asian or South American taxa.

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  • Canonical resource URI: http://purl.org/phylo/treebase/phylows/study/TB2:S1487
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