The paper analyses and summarises the results of floral surveys of 5 islands and part of the mainland coast of the Gulf of Onega, White Sea, which altogether constitute the "Syrovatka" local flora territory. A brief description of the islands and the checklist of vascular plants with 311 species of 171 genera and 66 families are provided. Analysis of the taxonomic and geographical structure has shown that although the local flora at large and the flora of individual islands have preserved the boreal appearance, the flora of some islands bears traits of arctic floras, and the “northern” features tend to become more explicit on smaller islands, further away from the mainland and with a lower proportion of forested area.