This name is a synonym of Yucca glauca Nutt..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 291642) with original publication details: Cactaceae Rev. 1(2): 21 1999.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1017018-1.
This name was in version 1 of The Plant List, record kew-291642.