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 311579) with original publication details: J. Linn. Soc., Bot. 18: 225 1880.
This name was in version 1 of The Plant List, record kew-311579.