Synonyms: Chlorocyperus congestus (homotypic); Cyperus badius (heterotypic); Cyperus bulbosus (heterotypic); Cyperus carinatus (heterotypic); Cyperus congestus var. glandulifer; Cyperus congestus var. glanduliferus; Cyperus congestus var. grandiceps; Cyperus congestus var. pseudonatalensis; Cyperus cooperi (heterotypic); Cyperus incarnatus; Cyperus linkianus; Cyperus martianus (heterotypic); Cyperus multiceps (heterotypic); Cyperus paramatta (homotypic); Cyperus polycephalus (heterotypic); Cyperus schottianus; Cyperus spiculosus (heterotypic); Cyperus subbulbosus; Mariscus congestus (heterotypic); Mariscus congestus var. glandulifer; Mariscus congestus var. glanduliferus; Mariscus cooperi; Pycreus congestus (homotypic)