This name is a synonym of Callitriche truncata Guss..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 31589) with original publication details: Jahrb. Gewächsk. 3: 30 1820.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:430001-1.
This name was in version 1 of The Plant List, record kew-31589.