Abstract
Summary 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. Key words Asteraceae, Karyotype, Lactuca species, Phylogeny. The genus Lactuca L. belongs to tribe Lactuceae, subfamily Cichorioideae, family Asteraceae. It includes 97 wild species of annual, biennial or perennial herbs with erect or ascending habit, which are predominantly self-pollinating (Thompson et al. 1958). It is distributed throughout the temperate and warm regions with 16 species in Europe, 12 species in America, 43 species in Africa and 51 species in Asia (Lebeda et al. 2001a, Doležalova et al. 2002). The genera is variable from the ecological viewpoint and its species occupied various habitats including seashores, fields, highways, ditches, roadsides, waste places, ruderal habitats and woodland communities (Lebeda
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