This name is a synonym of Azaleastrum albiflorum subsp. warrenii (A.Nelson) W.A.Weber.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50303865) with original publication details: Rhodora 95(881): 18 1993.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:971921-1.
This name was in version 1 of The Plant List, record tro-50303865.