Richard J. Jensen, Kristen M. Ciofani, Lydia C. Miramontes, Lines, Outlines, and Landmarks: Morphometric Analyses of Leaves of Acer rubrum, Acer saccharinum (Aceraceae) and Their Hybrid, Taxon, Vol. 51, No. 3 (Aug., 2002), pp. 475-492
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Jensen et al. (2002) studied this question.