Potamogeton trichoides Cham. et Schlecht.

Material examined.

RUSSIA, Tyumen Reg. - Tobolsk distr. • Savina; 58.2099°N, 68.2162°E; lake on the left coast floodplain of Irtysh River, shallow water off the shore; 21 Jul. 2018 • Savina; 58.2148°N, 68.2150°E; left coast floodplain of Irtysh River, lake on the northern outskirts of the village, shallow water; 21 Jul. 2018 • 450 m S of Bajgara; 58.0236°N, 68.8440°E; lake in the floodplain of the right coast of Irtysh River, shallow coastal water; 3 Jul. 2019 • 9,5 km E of Tobolsk, E of the “Tobolsk-Polymer” site; 58.2200°N, 68.4718°E; channel along the railway, in front of the dam, shallow water; 19 Jul. 2019 • Tobolsk, microdistrict “Levoberezh'e”; 58.2313°N, 68.2133°E; left-coast floodplain of Irtysh River, Like "Bol'shoe Dikoe", shallow water off the west shore, opposite house No 88; 25 Jul. 2019 • Tobolsk, microdistrict “Levoberezh'e”; 58.2110°N, 68.2265°E; left-coast floodplain of Irtysh River, the like, overgrown shallow water off the shore; 25 Jul. 2019 .