The unique natural population of Trientalis europaea L. with extremely high variation of flower structure was studied by RAPD analysis. Using 20 semi-specific primers complementary to plant exon-intron boundaries, we found 9 molecular markers for DNA polymorphism analysis in T. europaea. The studied population displayed low DNA polymorphism: we found only 5 polymorphic variants and 3 of them were represented by single plants. These data suggest that the studied population was mostly clonal. So, high variation of flower structure in this population was not mediated by genotypic diversity. In our previous studies, we demonstrated that the structure of T. europaea flowers was also not determined by plant ontogeny. Moreover, various local deviations in
T. europaea flower structure were shown to fit the Poisson distribution. These data strongly support the idea that the key role in the studied fluctuations is played by stochastic events.