This name is a synonym of Callitriche palustris var. elegans (Petrov) Y.L.Chang.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 455125) with original publication details: Key Pl. Far East. USSR 2: 712 1932.
This name was in version 1 of The Plant List, record kew-455125, and has not been changed.