‘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: