Stuckenia chakassiensis (Kaschina) Klinkova x S. macrocarpa (Dobroch.) Tzvel.

Material examined.

RUSSIA, Tyumen Reg. - Armizonsky distr. • 3.2 km E of village Poloe; 55.7418°N, 67.8280°E; Lake Sen'kovo, sandy-silty shallow water on the south shore; salinity of the water is 2.8 g /l; 30 Jul. 2019; IBIW (Fig. 1) .

Note.

This hybrid has intermediate characteristics between the parent species: the fruits are smaller than those of S. macrocarpa, and not all ovaries develop into fruits; there are subepidermal bunds of mechanical tissue in the leaves, as in S. chakassiensis (Klinkova 2006; Kipriyanova and Bobrov 2016), but in lower numbers. The hybrid has also long peduncles - up to 23 cm in length (Fig. 2, A, B).