Phylogeny and biogeography of the genusZornia(Leguminosae: Papilionoideae: Dalbergieae)

The genusZorniahas a pantropical distribution and comprises 80 species in two subgenera (Myriadena, Zornia) and three sections (Zornia, Isophylla, Anisophylla). The genus is characterized mainly by flowers arranged in a spiciform inflorescence, with paired peltate bracteoles protecting each flower,...

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Bibliographic Details
Published in:Taxon 2013-08, Vol.62 (4), p.723-732
Main Authors: Fortuna-Perez, Ana Paula, da Silva, Marcos José, de Queiroz, Luciano Paganucci, Lewis, Gwilym Peter, Simoes, André Olmos, de Azevedo Tozzi, Ana Maria Goulart, Sarkinen, Tiina, de Souza, Anete Pereira
Format: Article
Language:English
Subjects:
Biogeography
Biological taxonomies
Datasets
Inflorescences
Leaves
Parsimony
Phylogenetics
Phylogeny
Plants
SYSTEMATICS AND PHYLOGENY
Taxa
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Summary:The genusZorniahas a pantropical distribution and comprises 80 species in two subgenera (Myriadena, Zornia) and three sections (Zornia, Isophylla, Anisophylla). The genus is characterized mainly by flowers arranged in a spiciform inflorescence, with paired peltate bracteoles protecting each flower, and stipules that resemble the bracteoles. PhylogeneticallyZorniais a member of the informal Adesmia clade of the Dalbergioid group, being most closely related to the predominantly South American generaPoiretiaandAmicia.Phylogenetic analyses of DNA sequence data from the internal transcribed spacer region of nuclear ribosomal DNA and the plastidtrnL-trnFintron and spacer, including multiple accessions of species of all subgenera and sections, support the monophyly ofZorniaand indicate thatPoiretiais sister toZornia.All traditional subgenera and sections ofZorniaare resolved as para- or polyphyletic in our study. Nevertheless, two major clades can be recognized. Time-calibrated phylogenetic analyses suggest that mostZorniaspecies diverged 8-10 Ma and reveal that only one migratory event occurred within the genus ca. 5 Ma from America to the Old World probably via long-distance dispersal.
ISSN:0040-0262
1996-8175