This name is a synonym of Grabowskia duplicata Arn..
The record derives from WCSP (in review)
(data supplied on 2012-03-26)
which reports it as a synonym with original publication details: Prodr. 13(1): 20 1852.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:815805-1.
This name was in version 1 of The Plant List, record kew-2831554, and has not been changed.