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The data generated during the present study reveals the impact of polyploidy and hybridity in three taxa of Argemone. The data highlights that the influence of polyploidy and hybridity is highly variable both with respect to morphological and biochemical parameters. The probable explanation for such plasticity has been discussed.

The paper records observations on the impact of genome multiplicity on the profiles of three types of nitrogenous compounds in four varieties of N. tazetta. The results demonstrate that polyploidy causes varied effects. It may or may not alter the biochemical profiles and whenever it does, the spectrum is either widened or narrowed. The same trend is followed even by the quantity of specific com-pounds. The possible explantations of such changes have been discussed.

The paper contains observations on the foliar flavonoid profiles of di-, tri and tetrasomic individuals of Plantago lagopus L. The results indicate that the presence of additional chromosome 4 induces qualitative as well as quantitative changes in flavonoids. The possible reasons for such changes have been discussed.