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Summary. In 2017, a field research of the aquatic macrophyte flora of 29 water bodies in Kurgan region was carried out. Samples of aquatic macrophytes were collected, geobotanical descriptions of plant aggregations were made, and water samples for chemical analysis were taken from the ecotopes. For the preparation of the next edition of the Red Data Book of Kurgan region, the found populations of rare aquatic macrophytes such as Ruppia maritimа L., Chara aspera Deth. ex Willd., Chara contraria A. Br., Chara kirghisorum Lessing emend. Hollerb. are of interest. Newdata on the locations, coenotic environment, and ecology of these species in Kurgan region are provided; also, the rare species Chara aspera, C. contraria, C. kirghisorum at the northern bound of their area are recommended for inclusion in the next edition of the regional Red Data Book. Работа выполнена при поддержке РФФИ и Правительства Ханты-Мансийского автономного округа – Югры в рамках научного проекта р_урал_а № 15-44-00014.

In 2015–2017 in Omsk region, 4 new locations of Salvinia natans (L.) All.(Salviniaceae, Polypodiophyta) were found; they are located far to the north of the previously known ones in this region. In the S. natans aquatic ecotopes, рН is 7,5 to 8,3, color is 13 to 40 degrees of chromecobalt scale, total hardness is 3,17 to 7,79 meq/dm3, and total mineralization is 0,31 to 0,87 g/dm3. In the West Siberian Plain in general (including previously obtained materials for the northern regions of the Republic of Kazakhstan, Omsk and Novosibirsk regions of the Russian Federation), the physical-chemicals parameters of the aquatic environment in S. natans ecotopes are as follows:рН is 7,2 to 8,6, color is 13 to 40 degrees of chrome-cobalt scale, total hardness varies between 1,50 to 7,79 meq/dm3, and total mineralization varies between 0,20 to 0,87 meq/dm3. Species abundance in the studied populations varies from single units to several thousands units. In large populations, average species density is up to 15 units per m2, with maximum density in certain areas reaching 80 to 120 units per m2. In last 25 years, the species area shows a clear trend for extending northwards along the valley of the Irtysh River by 200 to 220 km. Работа выполнена при поддержке РФФИ и Правительства Ханты-Мансийского автономного округа – Югры в рамках научного проекта р_урал_а № 15–44–00014.