This name is a synonym of Callitriche platycarpa Kütz..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 341620) with original publication details: Consp. Fl. Eur. 250 1879.
This name was in version 1 of The Plant List, record kew-341620, and has not been changed.