This name is a synonym of Agave xylonacantha Salm-Dyck.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 294290) with original publication details: Cact. Succ. J. (Los Angeles) 31: 114 1959.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:6748-2.
This name was in version 1 of The Plant List, record kew-294290, and has not been changed.