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Abstract Detail

Molecular Ecology and Evolution

Riser, James [1], Roalson, Eric [2].

Phylogenetics of the dwarf milkweed group (Asclepias eastwoodiana-ruthiae-sanjuanensis-uncialis,Asclepiadoideae: Apocynaceae).

The dwarf milkweed group comprises four diminutive species of early-flowering milkweeds (Asclepias eastwoodiana,ruthiae, sanjuanensis, and uncialis) native to xeric habitats of the western United States. Three of the four species have been treated as infraspecific taxa of Asclepias uncialis; however, significant morphological differences exist between these putative species. Additionally, their distributions are essentially allopatric in all but one case. We are using chloroplast DNA markers to reconstruct a phylogeny of these four taxa. A robust phylogeny for this group will allow us to examine the validity of current taxonomic treatments, the potential hybrid origin of A. sanjuanensis, and the evolutionary history of the dwarf-milkweed group. This phylogeny will also allow us to test phylogeographic hypotheses related to this group of interesting western plants.

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1 - Washington State University, School of Biological Sciences, Abelson, Room 339, PO Box 644236, Pullman, WA, 99164-4236, USA
2 - Washington State University, School Of Biological Sciences, Abelson Hall 339, Pullman, WA, 99164-4236, USA


Presentation Type: Oral Paper:Papers for Topics
Session: 17
Location: Westminster Room/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 4:00 PM
Number: 17010
Abstract ID:741


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