This name is a synonym of Nuphar pumila (Timm) DC..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 22600253) with original publication details: Bull. Soc. Bot. France 51: Sess. Extraord. 143 [cxliii] 1904.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:605432-1.
This name was in version 1 of The Plant List, record tro-22600253.