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A molecular phylogeny of the subtribe Pterostylidinae (Orchidaceae): resolving the taxonomic confusion


Janes, J and Steane, DA and Vaillancourt, RE and Duretto, MF, A molecular phylogeny of the subtribe Pterostylidinae (Orchidaceae): resolving the taxonomic confusion, Australian Systematic Botany, 23, (4) pp. 248-259. ISSN 1030-1887 (2010) [Refereed Article]

DOI: doi:10.1071/sb10006


In the past decade, two major classification schemes of the subtribe Pterostylidinae have resulted in taxonomic confusion because a single well known genus was split into a large number of new genera and subgenera, many of which are difficult to discriminate accurately. These classifications have not been accepted widely among systematists because of poor phylogenetic support for several genera. Analyses of the internal transcribed spacer (ITS) region of nuclear rDNA in a large number of species and samples facilitate further clarification of the relationships within the Pterostylidinae. The phylogenetic trees were reconstructed using parsimony and Bayesian methods. These phylogenetic trees indicate that subtribe Pterostylidinae is monophyletic, and support the concept of a single genus, Pterostylis R.Br. sensu lato within the Pterostylidinae. Two clades representing subgenera correlate with the morphology of the lateral sepals, whereas several of the previously erected genera consistently have poor support. The proposed subgenera are divided further into 10 sections. Several closely related taxa with identical ITS sequences require further scrutiny by population-level molecular techniques to determine their taxonomic status. © 2010 CSIRO.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Evolutionary biology
Research Field:Phylogeny and comparative analysis
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Terrestrial biodiversity
UTAS Author:Janes, J (Ms Jaz Janes)
UTAS Author:Steane, DA (Dr Dorothy Steane)
UTAS Author:Vaillancourt, RE (Professor Rene Vaillancourt)
ID Code:66865
Year Published:2010
Web of Science® Times Cited:13
Deposited By:Plant Science
Deposited On:2011-02-16
Last Modified:2011-05-12

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