SUMMARY
The purpose of these studies was to evaluate the influence of the herbicide Roundup® on reproductive processes of Echinacea angustifolia Moench and Linum usitatissimum L. The plants with the flowers and fruits at various developmental stages were treated with Roundup 360 SL at 1% concentration. The effects on microsporogenesis, pollen viability, megasporogenesis, embryo sac development, embryo-genesis and endosperm development were studied. All mentioned processes could be disturbed, resulting in decrease of pollen viability and seed set of the treated plants, in comparison with non-treated individuals from the same collection.