This name is a synonym of Callitriche palustris L..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 31637) with original publication details: Herb. Portug. 44 1913.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:139182-1.
This name was in version 1 of The Plant List, record kew-31637.