Philip D. Cantino, Steven J. Wagstaff, Richard G. Olmstead, Caryopteris (Lamiaceae) and the Conflict between Phylogenetic and Pragmatic Considerations in Botanical Nomenclature, Systematic Botany, Vol. 23, No. 3 (Jul. - Sep., 1998), pp. 369-386
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Cantino et al. (1998) studied this question.
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