This name is a synonym of Juncus balticus subsp. andicola (Hook.) Snogerup.
The record derives from IOPI
(data supplied on 2012-03-23)
which reports it as a synonym and as an invalid name (record 314394) with original publication details: Berberid. Amer. Austral. 56 1857.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:442678-1.
This name was in version 1 of The Plant List, record kew-314394.