The flora of the East Carpathian BR is species rich and biogeographically outstanding. The Bukovske Hills are a botanical frontier between the East and West Carpathians. The most common type of vegetation are forests. The diversity of forest types reflects differences in conditions over the altitude range of more than 1,000 m in the reserve. Oak-beech forests are found on the lowest and warmest sites.
Various ferns are also common.
Near the summits, harsh conditions limit tree grow. Characteristic woody species are birches. From the viewpoint of silvicullture and genetics, the occurence of rare varieties and growth forms in birch species and birch hybrids is notable. Poloninas, mountain grasslands at timberline, are a species-rich and representaive formation of the East Carpathian mountains. Most are secondary communities that arose due to cattle grazing on mountain ridges.