John P. Carulli, David E. Fairbrothers, Allozyme Variation in Three Eastern United States Species of Aeschynomene (Fabaceae), Including the Rare A. virginica, Systematic Botany, Vol. 13, No. 4 (Oct. - Dec., 1988), pp. 559-566
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Carulli et al. (1988) studied this question.
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