Systematics Section / ASPT
Zhang, Wenjun , Saarela, Jeffery M. , Graham, Sean W. .
Molecular variation in Acorus (Acoraceae) inferred from nuclear and plastid DNA sequence data.
ACORUS L. (sweet flag) – the probable sister-group of the rest of the monocotyledons – is a small genus distributed natively in Asia and North America, and introduced in Europe and North America. It is widely recognized that Acorus contains two morphologically distinct species groups: the A. calamus complex and the A. gramineus complex. Morphological, geographical, cytological, and ecological variability in each complex has led to various taxonomic treatments. Current authors recognize between two and six species in Acorus. We surveyed molecular variability in the nuclear ribosomal internal transcribed spacer regions (ITS 1 and ITS 2) and five plastid regions (portions of the protein-coding genes ndhF and matK, the trnT-trnL-trnF region, the psbA-trnH intergenic spacer, and the rps16 intron) in multiple geographically, morphologically, and cytologically diverse individuals of Acorus. Parsimony and Bayesian analyses indicate that the A. calamus and A. gramineus complexes are monophyletic. Substantial molecular variability within the A. gramineus complex is consistent with the possible recognition of multiple taxa.
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1 - National University, School of Business and Management, San Diego, California,
2 - University of British Columbia, Botanical Garden And Centre For Plant Research, 6804 Sw Marine Drive, Vancouver, British Columbia, V6T 1Z4, Canada
Presentation Type: Oral Paper:Papers for Sections
Date: Wednesday, August 2nd, 2006
Time: 8:00 AM