Systematics/Phytogeography / Taxonomie/ Section
Mora, M. Marcela , Clark, John L. .
A Preliminary Phylogeny of Paradrymonia (Gesneriaceae) Based on Nuclear and Chloroplast Markers.
Paradrymonia (Gesneriaceae) is a genus of facultative epiphytic herbs with 38 currently recognized species. It occurs throughout the neotropics except SE Brasil and the Caribbean with centers of diversity in Colombia and Ecuador. Species relationships within this genus were assessed using molecular data generated from the nuclear ribosomal (nrDNA) internal transcribed spacer region (ITS) and the chloroplast trnH-psbA intergenic spacer region. Analyses utilizing parsimony, maximum likelihood and Bayesian inference methods were used to assess phylogenetic relationships among 18 species of Paradrymonia and several other species from other genera within the tribe Episcieae. A preliminary analysis strongly support that Paradrymonia, as currently circumscribed, is polyphyletic and includes taxa in two different clades. A strongly supported clade containing the type species of Paradrymonia includes Chrysothemis pulchella and five species of Nautilocalyx. Another clade including Paradrymonia longifolia and P. anisophylla nest within a paraphyletic Drymonia. Important morphological features such as bearded anthers, rosette habit, and corolla tube angulation are proposed as key morphological synapomorphies.
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1 - The University of Alabama, Department of Biological Sciences, Box 870345, Tuscaloosa, AL, 35487, United States
2 - University of Alabama, Department of Biological Sciences, Box 870345, Tuscaloosa, AL, 35487, USA
Presentation Type: Oral Paper:Papers for Sections
Date: Wednesday, July 30th, 2008
Time: 12:15 PM