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The most taxonomically perplexing type of plant group is the polyploid complex (Stebbins 1938). In such a complex species have mostly common morphological features besides the closely similar genomes. This provides a good source for the study of interrelationships and origin of species. Solanum nigrum is a good example of polyploid complex based on X=12 chromosomes. A good deal of work has already been done to find out the relationships among the species of S. nigrum complex (Chennaveeraiah and Patil 1968, D'Arcy 1974, Edmonds 1977, Khan et al. 1977 , 1978, 1985, Schilling and Heiser 1979, Rao and Kumar 1984, Ganpathi and Rao 1986) but still the clear picture of the interrelationships among the several members of this complex is to come out. Therefore, the cytogenetical investigation has been carried out to find out the interrelationship between S. opacum and Sm furcatum of S . nigrum complex.

Crossability and genomic relationship of some species of Solanum nigrum complex.