Juncus arcticus var. montanus (Engelm.) Balslev in Brittonia 35: 308. 1982 sec. Espejo-Serna & López-Ferrari 2008
- =Juncus balticus var. montanus Engelm. in Trans. Acad. Sci. St. Louis 2: 442. 1866 syn. sec. Espejo-Serna & López-Ferrari 2008
- =Juncus balticus var. vallicola Rydb. in Bull. Torrey Bot. Club 31: 399. 1904 syn. sec. Espejo-Serna & López-Ferrari 2008
- =Juncus ater Rydb., Fl. Rocky Mts.: 1060. 1918 syn. sec. Espejo-Serna & López-Ferrari 2008
- =Juncus vallicola (Rydb.) Rydb., Fl. Rocky Mts.: 1060. 1918 syn. sec. Espejo-Serna & López-Ferrari 2008
- =Juncus arcticus subsp. ater (Rydb.) Hultén in Kongl. Svenska Vetenskapsakad. Handl. IV, 8: 24. 1962 syn. sec. Espejo-Serna & López-Ferrari 2008