This name is a synonym of Callitriche palustris var. elegans (Petrov) Y.L.Chang.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 31714) with original publication details: Neo-Lineam. Fl. Manshur. 432 1979.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:875467-1.
This name was in version 1 of The Plant List, record kew-31714, and has not been changed.