Included here is most of Kamchatka (but not its forest tundra region), Karagin Island, the western shores of the Okhotsk Sea (Okhotia) and adjacent islands, the western shores of the Tatar Straits south to the the Bay of Soviet Gavan, the lower Amur River, northern Sakhalin, the northern Kuril Islands, the Commander Islands and the western and middle Aleutian Islands.
Of the endemic and near endemic vascular plants so far recorded there are about 204 species in 105 genera and 39 families. There are 3 endemic genera (marked red) but no endemic families.
Hulten, E. 1971. The plant cover of southern Kamchatka. Arkiv för botanik, 7: 181- 257.
Knystautas, A. 1987. The Natural History of the USSR. Century Hutchinson Ltd.
Kolbek, J., Srutek, M. & Box, E. O. 2003. Forest Vegetation in Northeast Asia. Kluwer Academic Publishers.