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Citation for Study 1239

About Citation title: "Viburnum phylogeny based on combined molecular data: implications for taxonomy and biogeography".
About This study was previously identified under the legacy study ID S1153 (Status: Published).


Winkworth R.C., & Donoghue M.J. 2005. Viburnum phylogeny based on combined molecular data: implications for taxonomy and biogeography. American Journal of Botany, 92(4): 653-666.


  • Winkworth R.C.
  • Donoghue M.J.


We investigated the phylogeny of Viburnum using separate and combined analyses of DNA sequence data from two chloroplast (i.e., trnK intron and psbA-trnH intergenic spacer) and three nuclear (i.e., nrITS and two copies of GBSSI) loci. Separate analyses of nuclear and chloroplast data sets resulted in gene trees that were generally congruent with each other and with trees from two previous analyses. However, visual inspection of trees from separate nuclear and chloroplast analyses indicated several areas of localized incongruence; specifically, (i) the position of section Pseudotinus, (ii) species relationships within section Pseudotinus, and (iii) relationships among the core members of section Lentago. Incongruence length difference and the significantly less parsimonious tests indicate significant difference between data partitions. However, gene trees recovered from combined analyses were highly similar to those found in separate analyses, with many relationships well resolved and supported. Although we remain cautious about relationships that showed conflicting resolution in separate analyses, localized difference between data partition do not appear to have affected other regions of the tree. Our analyses provide convincing support for numerous relationships within Viburnum, although there is still uncertainty at the base of the tree (i.e., relationships among the supra-sectional lineages and V. clemensiae, as well as the exact placement of the root). On the basis of these results we suggest informal names for twelve well-supported species groups, as well as for several higher-level clades. These new names provide a descriptive framework and will facilitate future study. We also discuss the biogeographic implications of our phylogeny. In particular we focusing on repeated, although apparently temporarily incongruent, patterns of disjunction between the Old and New Worlds.


biogeography; data combination; phylogeny; taxonomy; Viburnum

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