Richard M. Bateman, Peter M. Hollingsworth, Morphological and Molecular Investigation of the Parentage and Maternity of Anacamptis xalbuferensis (A. fragrans x A. robusta), a New Hybrid Orchid from Mallorca, Spain, Taxon, Vol. 53, No. 1 (Feb., 2004), pp. 43-54
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Bateman et al. (2004) studied this question.
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