@ARTICLE{TreeBASE2Ref17586, author = {Robert J. Soreng and Jerrold I. Davis and Monica A. Voionmaa}, title = {A phylogenetic analysis of Poaceae tribe Poeae s.l. based on morphological characters and sequence data from three plastid-encoded genes: evidence for reticulation, and a new classification for the tribe}, year = {2007}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Kew Bulletin}, volume = {62}, number = {3}, pages = {425--454}, abstract = {Phylogenetic analysis of nucleotide sequence variation, structural variation in three plastid-encoded genes and variation in 18 morphological characters provide a well-supported hypothesis of relationships within Poaceae supertribe Poodae. Of the ca. 135 genera that are thought to belong to this group, 57 were sampled, representing all of the major groups and most of the minor groups that have been recognised as tribes or subtribes. Historical and modern classifications of Poodae, which includes tribes Aveneae, Hainardieae, Poeae, and other smaller tribes, are reviewed and examined in the light of relationships detected by the phylogenetic analyses. Two major plastid DNA lineages were detected, and they correspond in general to groups traditionally recognised as Aveneae and Poeae, but there is conflict between relationships indicated by the DNA and traditional classifications in ca. one fifth of the genera. Character distributions on the trees reveal substantial differences between homoplasy levels for some morphological characters when placed on morphological versus combined trees. These results suggest possible wide hybrid origins of some groups, especially subtribe Airinae. A substantially revised classification is provided for Poodae, with all previously recognized tribes subsumed within a broadly circumscribed Poeae s.l., in which all accepted genera are accommodated in 21 subtribes. Aveneae and smaller groups that have been recognized as tribes, including Hainardieae, Phalarideae, Phleeae and Seslerieae, are reduced to subtribes. Monophyly of many of the subtribes has at least some molecular support, but others need further study, particularly involving nuclear genes, to better determine their relationships and investigate possible hybrid origins.} }

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