Karyotypes of 40 accessions representing 10 different Lactuca species were studied in detail. Karyological features were numerically analyzed. The cluster analysis of the collected karyological data indicated significant inter-and intra-specific differences for all variables measured. L. sativa and L. serriola had similar karyotypes, suggesting close relationship of these species.
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El‐Esawi et al. (2014) studied this question.