This name is a synonym of Spirodela punctata (G.Mey.) C.H.Thomps..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 109330) with original publication details: Prim. Fl. Esseq. 262 1818.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:137295-2.
This name was in version 1 of The Plant List, record kew-109330.