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Molecular Phylogeny of Dissanthelium (Poaceae: Pooideae) and its Taxonomic Implications

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Abstract—

We investigated the phylogeny of the New World grass Dissanthelium to explore its monophyly, to examine relationships within the genus, and to investigate its relationship with Poa. Molecular phylogenetic analyses including a thorough sampling of Dissanthelium (seventeen of the 20 species) and DNA sequences from the nuclear ribosomal ITS and plastid trnT-trnL-trnF regions suggest that Dissanthelium is not monophyletic and is nested within Poa. However, ten species form a strongly supported clade (the Dissanthelium clade) in the ITS tree. We propose treating Dissanthelium and Tovarochloa as taxonomic synonyms of Poa. We erect two new sections in Poa: sect. Dissanthelium, comprising the Dissanthelium clade and D. peruvianum, and the monotypic sect. Tovarochloa. The necessary new combinations ( Poa aequalis, P. amplivaginata, P. calycina var. mathewsii, P. gigantea, P. macusaniensis, P. rahuii, and P. trollii ) and new names ( Poa sections Dissanthelium and Tovarochloa, P. apiculata, P. arcuata, P. boliviana, P. congesta, P. deminuta, P. linearifolia, P. parvifolia, P. serpaiana, P. swallenii, and P. thomasii ) are effected herein.
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Keywords: Bayesian; Dissanthelium; ITS; Poa; Tovarochloa; maximum likelihood; trnT-trnL-trnF

Document Type: Research Article

Publication date: 2012-01-01

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