Key points are not available for this paper at this time.
Peter J. Lockhart, Patricia A. McLenachan, David Havell, David Glenny, Daniel Huson, Uwe Jensen, Phylogeny, Radiation, and Transoceanic Dispersal of New Zealand Alpine Buttercups: Molecular Evidence under Split Decomposition, Annals of the Missouri Botanical Garden, Vol. 88, No. 3 (Summer, 2001), pp. 458-477
Lockhart et al. (Mon,) studied this question.