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Timothy M. Evans, Robert B. Faden, Michael G. Simpson, Kenneth J. Sytsma, Phylogenetic Relationships in the Commelinaceae: I. A. Cladistic Analysis of Morphological Data, Systematic Botany, Vol. 25, No. 4 (Oct. - Dec., 2000), pp. 668-691
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Evans et al. (2000) studied this question.
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