Jerry M. Baskin, Carol C. Baskin, Endemism in Rock Outcrop Plant Communities of Unglaciated Eastern United States: An Evaluation of the Roles of the Edaphic, Genetic and Light Factors, Journal of Biogeography, Vol. 15, No. 5/6 (Sep. - Nov., 1988), pp. 829-840
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Baskin et al. (1988) studied this question.
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