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Ferguson, Carolyn [1], Patterson, Robert [2].

The big picture on Phlox phylogeny.

Phlox, the largest genus in the Polemoniaceae, comprises approximately 70 species of annual herbs, perennial herbs and subshrubs native mostly to North America. It is a valuable experimental system for a variety of evolutionary studies, yet the taxonomy is difficult, and phylogenetic relationships within Phlox as a whole have remained poorly understood. A comprehensive phylogenetic investigation (based on sequence data from the ITS region of the nuclear genome and trn intergenic spacer regions from the chloroplast genome) provides a framework for genus-wide evaluation of taxonomy, assessment of biogeographical patterns and studies of character evolution. An overview of the major lineages is presented, and the phylogeny is discussed in relation to taxonomy, geographical patterns, available chromosome counts and floral morphology (particularly length of the corolla tube and style and relative positioning of anthers, i.e., herkogamy). Finally, implications of some cases of incongruence between the nuclear- and cpDNA-based phylogenies are discussed.


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1 - Kansas State University, Division of Biology, Ackert Hall, Manhattan, Kansas, 66506-4901, USA
2 - San Francisco State University, Department of Biology, 1600 Holloway Ave., San Francisco, California, 94132, USA

Keywords:
Phlox
Polemoniaceae
ITS
trn
Phylogeny.

Presentation Type: Array
Session: 20-5
Location: 408/Hilton
Date: Monday, August 15th, 2005
Time: 4:30 PM
Abstract ID:469


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