Flora in reservoirs at the south part of the Ob-Irtysh interfluve is studied basing on the identification of geographic elements (type area), as well as taking into account the importance of chorological groups. Flora in ponds is full of boreal species with Holarctic and Eurasian types of habitat. On the other hand there is a group of species with Holarctic, Eurasian and other types of habitat associated with the arid region.

Key words: lora water, water plants, coastal aquatic plants, Ob-Irtysh rivers, types of habitats, geographical groups, cosmopolitan group holarctic group, Eurasian Group, Asian Group, endemics, boreal region, humid regions.