This name is a synonym of Juncus hybridus Brot..
The record derives from IOPI
(data supplied on 2012-03-23)
which reports it as a synonym (record 314865) with original publication details: Repert. Spec. Nov. Regni Veg. 48: 173 1940.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:442891-1.
This name was in version 1 of The Plant List, record kew-314865.