Authors: Zimmer, Elizabeth A.; Roalson, Eric H.; Skog, Laurence E.; Boggan, John K.; Idnurm, Alexander
Publication: American Journal of Botany
Year: 2002
Genera: Achimenes, Alloplectus, Besleria, Chrysothemis, Codonanthe, Columnea, Corytoplectus, Diastema, Drymonia, Episcia, Eucodonia, Gasteranthus, Gesneria, Gloxinia, Kohleria, Monopyle, Moussonia, Nautilocalyx, Nematanthus, Neomortonia, Niphaea, Paliavana, Paradrymonia, Pearcea, Phinaea, Rhytidophyllum, Sinningia, Smithiantha, Vanhouttea

The Gesnerioideae includes most of the New World members of the Gesneriaceae family and is currently considered to include
five tribes: Beslerieae, Episcieae, Gesnerieae, Gloxinieae, and Napeantheae. This study presents maximum parsimony and maximum likelihood phylogenetic analyses of nuclear ribosomal DNA internal transcribed spacer regions (ITS), and the chloroplast DNA trnL intron, trnL-trnF intergenic spacer region, and trnE-trnT intergenic spacer region sequences. The ITS and cpDNA data sets strongly support the monophyly of a Beslerieae/Napeantheae clade; an Episcieae clade; a Gesnerieae clade; a Gloxinieae clade minus Sinningia, Sinningia relatives, and Gloxinia sarmentiana; and a Sinningia/Paliavana/Vanhouttea clade. This is the first study to provide strong statistical support for these tribes/clades. These analyses suggest that Sinningia and relatives should be considered as a separate tribe. Additionally, generic relationships are explored, including the apparent polyphyly of Gloxinia. Chromosome number changes are minimized on the proposed phylogeny, with the exception of the n 5 11 taxa of the Gloxinieae. Scaly rhizomes appear to have been derived once in the Gloxinieae sensu stricto. The number of derivations of the inferior ovary is unclear: either there was one derivation with a reversal to a superior ovary in the Episcieae, or there were multiple independent derivations of the inferior ovary.

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