This name is a synonym of Haworthia coarctata Haw..
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym (record 277057) with original publication details: Haworthia & Astroloba 52 1983.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:922200-1.
This name was in version 1 of The Plant List, record kew-277057.