This name is a synonym of Callitriche terrestris subsp. turfosa (Bertero ex Hegelm.) Bacig..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 31708) with original publication details: Monogr. Callitriche 59 1864.
This name was in version 1 of The Plant List, record kew-31708, and has not been changed.