This name is a synonym of Haworthia coarctata var. adelaidensis (Poelln.) M.B.Bayer.
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym (record 277056) 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:922199-1.
This name was in version 1 of The Plant List, record kew-277056.