This name is a synonym of Haworthia coarctata var. tenuis (G.G.Sm.) M.B.Bayer.
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym (record 310000) with original publication details: J. S. African Bot. 14: 51 1948.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:51027861-1.
This name was in version 1 of The Plant List, record kew-310000.