Cladium mariscus is a species of flowering plant in the sedge family known by the common names swamp sawgrass, great fen-sedge, saw-sedge or sawtooth sedge. Previously it was known as elk sedge. It is native of temperate Europe and Asia where it grows in base-rich boggy areas and lakesides. It can be up to 2.5 metres (8 ft 2 in) tall, and has leaves with hard serrated edges.
- C. m. californicum (S.Watson) Govaerts - California, Arizona, New Mexico, Nevada, Utah, Texas, Sonora, Coahuila
- C. m. intermedium Kük. - Australia, New Caledonia
- C. m. jamaicense (Crantz) Kük. - Latin America from Mexico to Argentina; West Indies; southeastern United States from Texas to Delaware; naturalized in tropical Africa and on many oceanic islands including Canary Islands, Madagascar, New Guinea, Hawaii
- C. m. mariscus - Europe, northern Asia and North Africa from Ireland and Morocco to Japan, including Germany, Italy, France, Scandinavia, Poland, Balkans, Ukraine, Russia, Siberia, Saudi Arabia, Iran, Himalayas, Kazakhstan, China, Korea
- "Cladium mariscus". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 17 January 2016.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
- "Cladium mariscus". Germplasm Resources Information Network. USDA. Retrieved April 27, 2011.
- Theocharopoulos, Michael; Georgiadis, Theodoros; Dimitrellos, Georgios; Chochliouros, Stergios; Tiniakou, Argyro (2006). "Vegetation types with Cladium mariscus (Cyperaceae) in Greece" (PDF). Willdenowia. 36 (Special Issue): 247–256. doi:10.3372/wi.36.36120.
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