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Abstract Detail



Systematics Section/ASPT

Rose, Jeff [1], SYTSMA , KENNETH JAY [2].

New Insights in the Phylogeny of Polemonium (Polemoniaceae): Discordant Genealogies and New Morphological Traits.

Polemonium is the most widely distributed genus in the family Polemoniaceae. Its 25 to 45 species are found across Europe, Asia, North America, and South America in a wide diversity of habitats. The genus exhibits a wide diversity of floral and foliar morphologies as well as pollination types.  The diversity of pollination types has made several species in the genus the subject of intense ecological study. However, the evolutionary relationships within Polemonium have proved a difficult task to sort out as a result of hybridization and phenotypic plasticity.   Previous phylogenetic analyses of Polemonium have suffered from limited molecular divergence between species for the markers used. We have therefore increased sampling of the chloroplast and nuclear genomes, including the underused chloroplast region ycf1.  Increased genetic sampling results in better-resolved and better-supported topologies, especially for deeper nodes. Separate analysis of chloroplast, nuclear ribosomal, and low-copy nuclear markers recover strikingly incongruent topologies.  Results confirm previous findings that 1) the high-elevation, verticillate-leaved section Melliosoma is not monophyletic, 2) the high-elevation, verticillate leaved species in California are monophyletic, and 3) the annual species P. micranthum is sister to the rest of the genus.  New findings include 1) indication of chloroplast capture by high-elevation species of the Cascade Range, 2) confirmation of the taxonomic validly of the Great Lakes endemic P. occidentale ssp. lacustre, 3) phylogenetic structure in the rare eastern North American P. vanbruntaie, and 4) a possible hybrid origin of the newly-described Idaho endemic P. elusum. Morphological features that may prove useful in defining the newly discovered clades are suggested.


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1 - The University of Wisconsin-Madison, Botany, Birge Hall, 430 Lincoln Drive, Madison, Wisconsin, 53706, United States
2 - University Of Wisconsin, Department Of Botany, Birge Hall, 430 Lincoln Drive, Madison, WI, 53706, USA

Keywords:
Polemonium
Polemoniaceae
Ericales
hybridization
plastid capture
Western United States.

Presentation Type: Oral Paper:Papers for Sections
Session: 30
Location: Payette/Boise Centre
Date: Tuesday, July 29th, 2014
Time: 5:00 PM
Number: 30013
Abstract ID:633
Candidate for Awards:None


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