Detailed karyotype studies were carried out on 24 agricultural strains ofCoriandrum sativum, which show similarity in their chromosome number (2n= 22) and morphology. Variation in somatic nuclei with 2n= 15, 23, 24, 25, 27 chromosomes have been observed. In C.sativumvar. W.B4, 2n—24 or extra 2 chromosomes have been noted in the somatic complement. The extra chromosomes are probably B chromosomes. The karyotype analysis together with meiotic studies, suggest that structural alteration of chromosomes have contributed to the evolution of the different strains within the species. The presence of supernumerary constrictions in duplicate indicates homozygosity for structural changes. The strains differ in relation to such changes as detected in karyotypes and formation of regular bivalents. These characters have been attained by selection and as such they are able to stand competition.