This name is a synonym of Zantedeschia valida (Letty) Y.Singh.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 215532) with original publication details: Bothalia 11: 25 1973.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:874468-1.
This name was in version 1 of The Plant List, record kew-215532, and has not been changed.