Studies of vascular plants and vegetation of the Green Belt of Fennoscandia within Murmansk Region from the beginning of the 19th century until present are reviewed and summarized. Special attention is given to the analysis of the floristic knowledge on existing protected areas in the Green Belt of Fennoscandia, such as the Pasvik Strict Nature Reserve and Ainovi Islands in the Kandalakshsky Strict Nature Reserve, Nature Parks “Rybachy and Sredny Peninsulas” and “Korablekk”, regional nature reserves (zakaznik) “Kutsa” and “Kaita”, nature monuments “Waterfall on the Shuonijok River”, “Bio-group of Spruce Trees at the Range Limit”, “Siberian Stone Pine in the Nickel Forestry District”, as well as planned protected areas: federal and regional nature reserves “Voriema”, “Ionn Nyugoayv” and “Pazovsky”, and nature monument “Mires at Lake Alla-Akkayarvi”. For these territories, the floristic diversity has been analyzed, and data on the number of native and alien species, as well as on the vascular plants of highest nature conservation significance are presented. New records of vascular plants gathered over the past few years from the Murmansk part of the Green Belt of Fennoscandia are reported.