Abstract
SPECIES of Solanum belonging to the section Tuberarium and occurring in Mexico have long been of interest to potato breeders, as several of them possess resistance to the late-blight caused by Phytophthora infestans de Bary. Like the tuberbearing species of Solanum found in South America, the Mexican species also form a polyploid series comprising diploids (2n = 24), triploids (2n = 36), tetra-ploids (2n = 48), pentaploids (2n= 60) and hexa-ploids (2n = 72). These species have been classified in eight distinct taxonomic series, and our information concerning the cytogenetic affinities among them is still very fragmentary. As a preliminary towards gathering such data, a systematic survey of ability to cross among the diploid species occurring in Mexico was undertaken by me, during the summer of 1953, at the Inter-regional Potato Introduction Station, Sturgeon Bay, Wisconsin.
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