This name is a synonym of Juncus compressus Jacq..
The record derives from IOPI
(data supplied on 2012-03-23)
which reports it as a synonym (record 314779) with original publication details: Syn. Mitteleur. Fl. 2(2): 431 1904.
This name record (from IOPI) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Juncus compressus in version 1 of The Plant List.