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 453887) with original publication details: Leafl. W. Bot. 10: 28 1963.
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 bufonius in version 1 of The Plant List.