SUMMARY. Two species of the genus Galinsoga, G. parviflora Cav. and G. quadriradiata Ruiz & Pav., are among the most successful invasive plants causing significant damage to natural and agroecosystems. Their natural distribution range extends from North to South America, and the adventitious part of the range includes all continents except Antarctica. Despite the practical importance of G. parviflora and G. quadriradiata, the genetic diversity of European populations of these species remains unexplored. In this work, we used ISSR markers to study Ukrainian populations of G. parviflora and G. quadriradiata and compared them with plants from Poland, Lithuania and Portugal. The results obtained indicate the low genetic diversity (Shannon index I = 0.124) of G. quadriradiata populations, which is probably due to the small size of the original population introduced to the Old World from America. At the same time, the level of genetic diversity in G. parviflora populations is significantly higher (I = 0.254). Some genotypes of G. parviflora have a wide geographical distribution, and at the same time, different genotypes occur in the same area. The data obtained are in good agreement with the hypothesis that escape from botanical gardens is the main source of origin of invasive species of the genus Galinsoga. Among the samples examined, several forms of hybrid nature were found, probably originating from a hybrid between G. parviflora and G. quadriradiata as a result of subsequent backcrossing with one of the parent species.
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