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
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Lockhart et al. (2001) studied this question.