Phylogeny and taxonomy of Syngonanthus and Comanthera (Eriocaulaceae): Evidence from expanded sampling

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Abstract:

Comanthera and Syngonanthus (Eriocaulaceae) are monocotyledonous herbs that occur mainly in neotropical savannas in the Guiana Shield and in southeastern Brazil, with a few species in Africa. Phylogenetic relationships in Syngonanthus and Comanthera are still unresolved and have not yet been assessed using a broad and comprehensive sampling. The present study aimed to test the monophyly of both genera and their putative infrageneric taxa and to evaluate their taxonomy and supporting synapomorphies in the light of a resolved phylogeny. The resulting phylogenetic hypotheses were then used to infer the biogeographical histories of the taxa, especially in Brazil. Molecular analyses based on plastid (trnL-F, psbA-trnH) and nuclear (ITS) markers using parsimony and Bayesian inference were conducted on 62 species belonging to the ingroup. Syngonanthus s.l. (composed of Syngonanthus, Philodice and Comanthera), Syngonanthus s.str. (including Philodice), Comanthera and both of its subgenera were retrieved as monophyletic, strongly supported by molecular and morphological apomorphies. However Syngonanthus sect. Carphocephalus appeared polyphyletic, and its species were embedded within a paraphyletic S. sect. Syngonanthus. Within Comanthera, clades restricted to equatorial savannas appeared to be sisters to clades restricted to southeastern Brazil, especially in the Espinhaço Range, with a disjunct pattern between Bahia and Minas Gerais states. Within Syngonanthus s.str., Andean and African species appeared embedded in Brazilian clades, but resolution and support within the genus must be improved in future research.

Keywords: ESPINHAÇO RANGE; LEIOTHRIX; NEOTROPICS; PAEPALANTHOIDEAE; PHILODICE

Document Type: Research Article

DOI: http://dx.doi.org/10.12705/631.36

Affiliations: 1: UMR 7207 CNRS MNHN UPMC Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements, CP48, 43, rue Buffon, 75005 Paris, France, Universidade de São Paulo, Instituto de Biociências, Departamento de Botânica, Laboratório de Sistemática Vegetal, Rua do Matão 277, Cidade Universitária, Butantã, CEP 05508-090, São Paulo, SP, Brasil, Universidade Federal de Uberlândia, Instituto de Biologia, Rua Ceará s/n Bloco 2D sala 32, Campus Umuarama, CEP 38400-902, Uberlândia, MG, Brasil;, Email: livia.echter@inbio.ufu.com 2: Universidade de São Paulo, Instituto de Biociências, Departamento de Botânica, Laboratório de Sistemática Vegetal, Rua do Matão 277, Cidade Universitária, Butantã, CEP 05508-090, São Paulo, SP, Brasil 3: UMS 7700 CNRS MNHN UPMC Service de Systématique Moléculaire, Département de Systématique et Evolution, CP26, 43, rue Cuvier, 75005 Paris, France 4: Genoscope, Centre National de Séquançage, CP5706, 2, rue Gaston Crémieux, 91057 Evry Cedex, France 5: UMR 7207 CNRS MNHN UPMC Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements, CP48, 43, rue Buffon, 75005 Paris, France

Publication date: February 20, 2014

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