This name is a synonym of Petalidium otaviense Dinter.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym and as an invalid name with original publication details: Ann. Transvaal Mus. 18: 162 1936.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:46117-1.
This name was in version 1 of The Plant List, record kew-2670108.