This name is a synonym of Rhamnus scopulorum (M.E. Jones) C.B. Wolf.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50161184) with original publication details: Contr. W. Bot. 12: 6 1908.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:219071-2.
This name was in version 1 of The Plant List, record tro-50161184, and has not been changed.