This name is a synonym of Nuphar rubrodisca Morong.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 22600207) with original publication details: Rhodora 96(886): 172 1994.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:981161-1.
This name was in version 1 of The Plant List, record tro-22600207.