This name is a synonym of Callitriche palustris subsp. subanceps (Petrov) Kuvaev.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 31689) with original publication details: Izv. Glavn. Bot. Sada S.S.S.R. 27: 359 1928.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:139194-1.
This name was in version 1 of The Plant List, record kew-31689, and has not been changed.