This name is a synonym of Callitriche obtusangula Le Gall ex Hegelm..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 348985) with original publication details: Fl. Ill. France 4: 35 1921.
This name was in version 1 of The Plant List, record kew-348985, and has not been changed.