Schoenoplectus acutus var. occidentalis (S. Watson) S.G. Sm. in Novon 5: 97-98. 1995 sec. González-Elizondo & al. 2018
- =Scirpus lacustris var. occidentalis S. Watson, Bot. California 2: 218. 1880 syn. sec. Diego & González 2008
- =Scirpus occidentalis (S. Watson) Chase in Rhodora 6: 68. 1904 syn. sec. Diego & González 2008
- =Scirpus occidentalis var. congestus Farw. in Ann. Rep. Michigan Acad. Sci. 19: 247. 1917 syn. sec. Diego & González 2008
- =Scirpus acutus f. congestus (Farw.) Fernald in Rhodora 23: 131. 1921 syn. sec. Diego & González 2008
- =Scirpus malheurensis L.F. Hend. in Rhodora 32: 20. 1930 syn. sec. Diego & González 2008
- =Scirpus rubiginosus Beetle in Amer. J. Bot. 28: 697-698. 1941 syn. sec. Diego & González 2008
- =Scirpus acutus var. malheurensis (L.F. Hend.) Beetle in Univ. Wyoming Publ. 13: 5. 1948 syn. sec. Diego & González 2008
- =Scirpus acutus var. occidentalis (S. Watson) Beetle in Univ. Wyoming Publ. 13: 5. 1948 syn. sec. Diego & González 2008
- =Schoenoplectus rubiginosus (Beetle) Soják in Cas. Nár. Mus., Odd. Prír. 141: 127. 1972 syn. sec. Diego & González 2008