This name is a synonym of Luzula spicata subsp. conglomerata (W.D.J.Koch) Murr.
The record derives from IOPI
(data supplied on 2012-03-23)
which reports it as a synonym (record 316720) with original publication details: Anales Inst. Bot. Cavanilles 21(2): 478 1963 publ. 1964.
This name was in version 1 of The Plant List, record kew-316720.