This name is a synonym of Arbutus arizonica (A.Gray) Sarg..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Kalmia 12: 18 1982.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:920521-1.
This name was in version 1 of The Plant List, record kew-2646758, and has not been changed.