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Published online on February 6, 2004, 10.1073/pnas.0308127100

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Evolution
Darwin's abominable mystery: Insights from a supertree of the angiosperms

T. Jonathan Davies *{dagger}, Timothy G. Barraclough *{dagger}, Mark W. Chase {dagger}{ddagger}, Pamela S. Soltis §¶, Douglas E. Soltis ¶||, and Vincent Savolainen {dagger}{ddagger}**

*Department of Biological Sciences and Natural Environment Research Council Centre for Population Biology, Imperial College London, Silwood Park Campus, Ascot, Berkshire SL5 7PY, United Kingdom; {dagger}Molecular Systematics Section, Jodrell Laboratory, Royal Botanic Gardens, Kew TW9 3DS, United Kingdom; and §Florida Museum of Natural History, ||Department of Botany, and Genetics Institute, University of Florida, Gainesville, FL 32611

Communicated by Peter R. Crane{ddagger}, Royal Botanic Gardens, Surrey, United Kingdom, December 8, 2003 (received for review June 20, 2003)

Angiosperms are among the major terrestrial radiations of life and a model group for studying patterns and processes of diversification. As a tool for future comparative studies, we compiled a supertree of angiosperm families from published phylogenetic studies. Sequence data from the plastid rbcL gene were used to estimate relative timing of branching events, calibrated by using robust fossil dates. The frequency of shifts in diversification rate is largely constant among time windows but with an apparent increase in diversification rates within the more recent time frames. Analyses of species numbers among families revealed that diversification rate is a labile attribute of lineages at all levels of the tree. An examination of the top 10 major shifts in diversification rates indicates they cannot easily be attributed to the action of a few key innovations but instead are consistent with a more complex process of diversification, reflecting the interactive effects of biological traits and the environment.

{ddagger}M.W.C. and V.S. are employed by the Jodrell Laboratory, within the Royal Botanic Gardens, of which P.R.C. is director. The Royal Botanic Gardens did not provide any funding specifically for this research.

**To whom correspondence should be addressed.

E-mail: v.savolainen{at}kew.org.

www.pnas.org/cgi/doi/10.1073/pnas.0308127100
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