David M. Spooner, Ronald G. van den Berg, Aarón Rodríguez, John Bamberg, Robert J. Hijmans, Sabina I. Lara Cabrera, Wild Potatoes (Solanum section Petota; Solanaceae) of North and Central America, Systematic Botany Monographs, Vol. 68, Wild Potatoes (Solanum section Petota; Solanaceae) of North and Central America (Mar. 8, 2004), pp. 1-209
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Spooner et al. (2004) studied this question.