Systematics Section / ASPT
Chung, Kyong-Sook , Elisens, Wayne .
A phylogenetic investigation of the genus Agrimonia (Rosaceae).
The genus Agrimonia (Rosaceae) has never been investigated in a phylogenetic framework. Hypothesized taxonomic and systematic relationships within the genus have been based on regional and floristic investigations of morphological characters. The genus is delimited morphologically by interrupted pinnately compound leaves and achenes armed with hooked bristles. Species range throughout Northern and Southern temperate regions with considerable variation among morphological characters in ploidy levels. In order to test monophyly of the genus, define major lineages, and elucidate phylogenetic relationships among the major lineages, phylogenetic analyses based on nuclear (ITS) and chloroplast (trnL-trnF) markers were executed using Maximum Parsimony, Maximum Likelihood and Bayesian approaches. The analyses of both nrDNA and cpDNA data sets indicate that the genus Agrimonia is monophyletic with two strongly supported major clades: Euro American octoploids (8x) + North American tetraploids (4x), and North American octoploids (8x) + Asian and North American tetraploids (4x). Analyses show close relationships between East Asian 4x and North American 8x, and between European 8x and North American 8x, suggesting multiple migrations in divergent time periods. The plastid data suggest that American 8x (Agrimonia striata, A. gryposepala and A. pubescens) are polyphyletic.
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1 - University of Oklahoma, Department of Botany and Microbiology, 770 Van Vleet Oval, Norman, Oklahoma, 73019, USA
2 - University of Oklahoma, Botany & Microbiology and Oklahoma Biological Survey, 770 Van Vleet Oval, Norman, Oklahoma, 73019, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Stevens 3/Hilton
Date: Wednesday, July 11th, 2007
Time: 9:00 AM