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 314805) with original publication details: Proc. Amer. Acad. Arts 22: 480 1887.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:132081-2.
This name was in version 1 of The Plant List, record kew-314805.