‘Jar rzeki Raduni’ is a landscape nature reserve created in 1972, which covers an area of 74,26 ha. The reserve protects the Radunia river gorge in the moraine upland of the Kashubian Lake District. In past, the reserve was an object of numerous botanical studies, and it was distinguished by a large share of mountain species. The main aim of this research was to define the current state of mountain species of the studied area compared to historical data. The study was carried out in 2017. Eight mountain species were noted: Aconitum variegatum, Alnus incana, Bupleurum longifolium, Chaerophyllum hirsutum, Dryopteris expansa, Huperzia selago, Pleurospermum austriacum and Ribes alpinum. The occurrence of five species was not confirmed: Coeloglossum viride, Epipogium aphyllum, Melampyrum sylvaticum, Polygonatum verticillatum and Valeriana sambucifolia.

The book presents the characteristics of meadow and herb plants occurring in the Upper Vistula Valley. The significance of the vegetation in nature protection has been determined by the assessment of the share of protected vascular plant species and alien plant species which pose a threat to the phytocoenoses under investigation. Plant communities have been identified as Natura 2000 natural habitats and it has been proposed to create new protected areas to preserve the best-developed patches of vegetation studied.