Rhynchospora watsonii (Britton) Davidse in Ann. Missouri Bot. Gard. 61: 529. 1974 sec. González-Elizondo & al. 2018
- ≡Dichromena watsonii Britton in Bull. Torrey Bot. Club 15: 101. 1888 syn. sec. Diego & González 2008
- =Dichromena fasciata Maury in J. Bot. 2: 396. 1888 syn. sec. Diego & González 2008
- =Rhynchospora dussiana Boeckeler in Beitr. Cyper. 2: 40-41. 1890 syn. sec. Diego & González 2008
- =Rhynchospora dussii Duss in Ann. Inst. Bot.-Géol. Colon. Marseille 3: 553. 1896 syn. sec. Diego & González 2008
- =Rhynchospora radicans var. watsonii (Britton) Kük. in Bot. Jahrb. Syst. 75: 311. 1951 syn. sec. Diego & González 2008