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 345009) with original publication details: Yuccas Southw. U.S. 2: 169 1947.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:60443875-2.
This name was in version 1 of The Plant List, record kew-345009.