Mora , M. Marcela , Clark, John L. .
MolecularEvidence for the Polyphyly of the Neotropical Genus Paradrymonia (Gesneriaceae) and the resurrection of Trichodrymonia.
Paradrymonia Hanst. (Gesneriaceae) with 38 currently recognized species is a genus of facultative epiphytic herbs that inhabit the forest understory. The genus occurs throughout the Neotropics except for southeast Brazil and the Caribbean with centers of diversity in Colombia and Ecuador. Monophyly of Paradrymonia and species relationships within the genus and closely related genera were evaluated based on molecular sequence data from the nuclear ribosomal (nrDNA)internal and external transcribed spacer regions (ITS and ETS), and the chloroplast (cpDNA) trnH-psbA intergenic spacer. Analyses utilizing parsimony, maximum likelihood and Bayesian inference methods were used to assess phylogenetic relationships among 28 species of Paradrymonia and closely related genera. A preliminary analysis strongly supports that Paradrymonia, as currently circumscribed, is polyphyletic and includes taxa in four different clades. The clade that contains the type species is described as Paradrymonia sensu stricto (s.s) and includes three species: Paradrymonia ciliosa, P. campostyla and P. glabra. The Paradrymonia s.s.clade is sister to a clade that includes species of Nautilocalyx, Chrysothemis and most of the species traditionally recognized as Paradrymonia. Another clade including P. anisophylla is closely related to Codonanthopsis. Finally, Paradrymonia maculata is the sister taxon to Rhoogeton. Our results support a re-circumscription of Paradrymonia and the resurrection of a previously recognized genus name, Trichodrymonia, in order to accommodate the remaining ex-Paradrymonia species. Morphological characters such as bearded anthers, rosette habit, and leaf anisophylly are evaluated as potential characters for circumscribing generic boundaries.
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1 - The University of Alabama, Department of Biological Sciences, Tuscaloosa, AL, 35487-0345, USA
2 - University of Alabama, Biological Sciences, Box 870345, Tuscaloosa, AL, 35487, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Franklin A/Hyatt
Date: Tuesday, July 10th, 2012
Time: 9:00 AM