Juncus acutus subsp. leopoldii (Parl.) Snogerup in Bot. Not. 130: 187. 1978 sec. Espejo-Serna & López-Ferrari 2008
- =Juncus leopoldii Parl. in Giorn. Bot. Ital. 2: 324-325. 1845 syn. sec. Espejo-Serna & López-Ferrari 2008
- =Juncus macrocarpus Nees in Linnaea 20: 243. 1847 syn. sec. Espejo-Serna & López-Ferrari 2008
- =Juncus acutus var. leopoldii (Parl.) Buchenau in Abh. Naturwiss. Vereine Bremen 4: 421. 1875 syn. sec. Espejo-Serna & López-Ferrari 2008
- =Juncus acutus var. sphaerocephalus Engelm. in Rep. U. S. geogr. surv., Wheeler 6: 376. 1878 syn. sec. Espejo-Serna & López-Ferrari 2008
- =Juncus robustus S. Watson in Proc. Amer. Acad. Arts 14: 302-303. 1879 syn. sec. Espejo-Serna & López-Ferrari 2008
- =Juncus acuminatus f. sphaerocephalus (Engelm.) F.J. Herm. in Leafl. W. Bot. 8: 13-14. 1956 syn. sec. Espejo-Serna & López-Ferrari 2008