This name is a synonym of Haworthia reinwardtii f. chalumnensis (G.G.Sm.) M.B.Bayer.
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym (record 310036) with original publication details: J. S. African Bot. 9: 99 1943.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:60426808-2.
This name was in version 1 of The Plant List, record kew-310036, and has not been changed.