This name is a synonym of Yucca gloriosa var. tristis Carrière.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 293035) with original publication details: Cycl. Amer. Hort. 2001 1902.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:270360-2.
This name was in version 1 of The Plant List, record kew-293035.