This name is a synonym of Callitriche heterophylla Pursh.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 31706) with original publication details: Symb. Antill. 7: 265 1912.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:42525-2.
This name was in version 1 of The Plant List, record kew-31706.