A modification of the C-banding method yielded intercalary bands in certain chromosome pairs of Allium fistulosum and Allium cepa. One member of each pair of these identifiable chromosomes was present in the vegetatively propagated garden form Allium proliferum, indicating that A. proliferum represents a spontaneous hybrid between A. fistulosum and A. cepa. The chromosomes of this hybrid are compared with the chromosomes of the known hybrid artificially produced between the same two Allium species. Storage times of the slides, necessary for the appearance of the different types of bands are discussed.
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Geirid Fiskesjö (2009) studied this question.
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