References
For Viburnum
Clement, W.L., M. Arakaki, P.W. Sweeney, E.J. Edwards, and M.J. Donoghue. 2014. A chloroplast tree for Viburnum (Adoxaceae) and its implications for phylogenetic classification and character evolution. Amer. J. Bot. 101: 1029-1049. Google Scholar
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