Karyological and Phylogenetic Studies in the Genus Lactuca L. (Asteraceae)

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.