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Abstract Detail


Systematics Section

Mora , M. Marcela [1], Clark, John L. [2].

A preliminary phylogeny of the Neotropical plant genus Paradrymonia (Gesneriaceae) based on chloroplast and nuclear markers.

Paradrymonia (Gesneriaceae) is a genus of facultative epiphytic herbs with 38 currently recognized species. It occurs throughout the Neotropics except for SE 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 the 22 species of Paradrymonia and closely related genera. A preliminary analysis strongly supports that Paradrymonia, as currently circumscribed, is polyphyletic and includes taxa in three different clades. The clade that contains the type species is described as Paradrymonia sensu stricto (s.s) and includes three species: Paradrymonia ciliosa, P. decurrens and P. campostyla. The Paradrymonia s.s. clade is sister to a clade that includes species of Nautilocalyx, Chrysothemis and other species traditionally recognized as Paradrymonia. Another clade including Paradrymonia longifolia and P. anisophylla nest within a paraphyletic Drymonia. 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 anisophylly are discussed 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 - The University of Alabama,, Department of Biological Sciences, Box 870345, Tuscaloosa,, AL, 35487, USA

Keywords:
Gesneriaceae
Phylogeny
neotropics
Polyphyletic
Paradrymonia
systematics.

Presentation Type: Oral Paper:Papers for Sections
Session: 36
Location: Lindell B/Chase Park Plaza
Date: Tuesday, July 12th, 2011
Time: 2:00 PM
Number: 36003
Abstract ID:311


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