抄録
Ottelia from four different localities belonging to Nothern India, have been studied in the present work with the aid of improve method. Detailed study of karyotypes have been included within the scope of investigation. Special emphasis has been laid on the study of different populations of the same species to assess the role of structural alternations in the chromosomes in the evolution of different populations.
Species of Ottelia are remarkable in the sense that the populations differ with respect to the external morphology of the plant.
The diminution in chromatic matter along with polyploidy has been an associated feature of evolution in different families of flowering plants. The same is true in case of Ottelia. Hetrochromatic elimination appears to be more probable explanation for diminution in chromatic content, in this light of evidences so far obtained.
