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Systematics Section / ASPT

Edwards, Christine E. [1], Soltis, Douglas E. [2], Soltis, Pamela S. [3].

Molecular phylogeny of Conradina and other scrub mints (Lamiaceae) from the southeastern USA: evidence for hybridization in Pleistocene refugia?

Conradina (Lamiaceae) consists of six allopatric species endemic to the southeastern United States, four of which are federally endangered or threatened. The limits and status of several taxa have been contested based on morphological grounds, and clarification of these limits is necessary for the design and implementation of effective and fiscally responsible protection and management plans. The objectives of this study were to investigate the monophyly of Conradina and its relationship to other related mints which are endemic to the southeastern United States, to understand the patterns of diversification in Conradina and to clarify species relationships. A molecular phylogeny was inferred by sequencing regions from the nuclear and plastid genomes from multiple accessions of each species of Conradina, multiple individuals from species of Clinopodium, Dicerandra, Piloblephis, and Stachydeoma, and individuals of Monarda, Pycnanthemum, and Mentha as outgroups. The nuclear and plastid phylogenies conflict, which may be due to shared ancestral polymorphism and lineage sorting or, more likely, introgression that occurred very recently or during the Pleistocene.


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1 - University of Florida, Department of Botany, Florida Museum of Natural History, Gainesville, Florida, 32611
2 - University of Florida, Department of Botany, 220 Bartram Hall, P.O. Box 118526, Gainesville, Florida, 32611-8526, USA
3 - University of Florida, Florida Museum of Natatural History, Department Of Natatural Science, Gainesville, Florida, 32611-7800, USA

Keywords:
Conradina
interspecific hybridization
rare plants
incongruent phylogenies
Florida scrub and sandhill habitat
southeastern USA.

Presentation Type: Oral Paper
Session: 48-16
Location: Salon G - Austin Grand Ballroom/Hilton
Date: Wednesday, August 17th, 2005
Time: 5:00 PM
Abstract ID:360


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