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Abstract Detail



Systematics Section/ASPT

Worcester, Lindsey [1], Fishbein, Mark [2].

Phylogeny and Biogeography of Arid-Adapted Milkweeds (Podostemma Clade, Asclepias L., Apocynaceae).

Biogeographic disjunctions, separation of ranges between closely related species, raise questions of how biogeographic processes explain these patterns. Disjunctions are important because they are evidence of the ongoing story of speciation in response to geologic and environmental events. The Sierra Madre Occidental separates closely related milkweed species in the Podostemma clade (Asclepias L.). This group is a good system for studying the historical biogeography of semi-arid regions of North and Central America to better understand how species diverged in connection to related geologic or climatic events. Relationships among species in this clade were not fully resolved in the recently reconstructed chloroplast phylogeny. Conserved nuclear loci (COSII; orthologs across eurastrids) have been optimized for Asclepias and complete chloroplast genomes have been mostly obtained across Asclepias. Preliminary data will be presented on the utility of nuclear markers in phylogenetic estimation.


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1 - 309 S. West St., Apt. #2, Stillwater, OK, 74074, USA
2 - Oklahoma State University, Dept Of Botany, 301 Physical Science, Stillwater, OK, 74078, USA

Keywords:
phylogenetics
Biogeography
disjunction
grasslands
thornscrub
Milkweed
undescribed species
COSII loci.

Presentation Type: Oral Paper:Papers for Sections
Session: 33
Location: River Fork/Grove
Date: Wednesday, July 30th, 2014
Time: 9:30 AM
Number: 33007
Abstract ID:768
Candidate for Awards:None


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