This name is a synonym of Nymphoides elegans A. Raynal.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 20801970) with original publication details: Adansonia, n.s. 14(3): 426–428, t. 21 1974.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:581705-1.
This name was in version 1 of The Plant List, record tro-20801970, and has not been changed.