This name is a synonym of Gasteria obliqua (Aiton) Duval.
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym (record 307703) with original publication details: Gard. Chron. 1877(2): 38 1877.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:535755-1.
This name was in version 1 of The Plant List, record kew-307703.