Geographical and floristic features of the Tom river basin

The paper presents the results of long-term studies in the flora of vascular plants of the Tom River basin. The studies found that the flora of vascular plants of the Tom River basin includes 1,322 species, which belong to 115 families and 471 genera. The basis of the flora (about 95%) are the flowering plants, the ratio of dicots to monocots is 2.9. The ratio of species and genera (2.8) indicates the predominance of allochthonous processes in the development of the flora. Taxonomic analysis of the flora of the Tom River Basin revealed that the overall indicators of taxonomic structure of the flora reflect the location of the basin on the edge of the West Siberian and Altai-Sayan floristic provinces that are part of the Boreal Circumboreal subkingdoms of the Holarctic floristic kingdom.