This name is a synonym of Dieffenbachia seguine (Jacq.) Schott.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 452241) with original publication details: Fl. Bras. 3(2): 176 1878.
This name record (from WCSP) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Dieffenbachia picta in version 1 of The Plant List.