This name is a synonym of Potamogeton octandrus Poir..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 308673) with original publication details: Abh. Naturwiss. Vereins Bremen 7: 32 1880.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:603355-1.
This name was in version 1 of The Plant List, record kew-308673.