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Abstract Detail


Systematics Section

Harbaugh, Danica T. [1], Nepokroeff, Molly [2], Rabeler, Richard K. [3], Zimmer, Elizabeth [4], Wagner, Warren L. [1].

Classification of the Caryophyllaceae and Colonization of a Divergent Hawaiian Lineage.

Understanding the relationships within the Caryophyllaceae has been difficult due to ill-defined genera and convergent morphological characters. This study represents the most complete phylogenetic analysis of the family, with particular focus on the large subfamily Alsinoideae, using molecular characters to examine the validity of the current taxonomy, as well as to identify the source area for colonization of a divergent endemic Hawaiian lineage, the genus Schiedea. Maximum parsimony and maximum likelihood analyses of three chloroplast gene regions (matK, trnL-F, and rps16) from 135 specimens reveal that the three traditional subfamilies (Alsinoideae, Caryophylloideae, and Paronychioideae) are not reflective of natural groups and need to be abandoned; a new system based on tribes is proposed. Many of the subtribes and genera, especially within the Alsinoideae, are also not monophyletic. Large genera such as Arenaria and Minuartia are polyphyletic and in need of significant revision, as well as are several smaller genera. Examination of the biogeographic areas on the phylogeny elucidates an Arctic origin for the Hawaiian genus Schiedea, which is most closely related to the circumboreal genera Honckenya and Wilhelmsia.


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1 - National Museum of Natural History, Smithsonian Institution, Botany, P.O. Box 37012, MRC 166, Washington, DC, 20013-7012, USA
2 - University of South Dakota, Department of Biology, 414 East Clark Street, Vermillion, South Dakota, 57069, USA
3 - University of Michigan Herbarium, 3600 Varsity Drive, Ann Arbor, MI, 48108-2287, USA
4 - National Museum of Natural History, Smithsonian Institution, Museum Support Center, 4210 Silver Hill Road, Suitland, MD, 20746, USA

Keywords:
Schiedea
Biogeography
Alsinoideae
Hawaiian Islands
Caryophyllaceae
molecular phylogeny
rps16
matK
trnL-F.

Presentation Type: Oral Paper:Papers for BSA Sections
Session: 33
Location: Magpie A/Cliff Lodge - Level B
Date: Tuesday, July 28th, 2009
Time: 9:15 AM
Number: 33006
Abstract ID:145


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