Cyperus perennis (M.E. Jones) O'Neill Cyperus perennis (M.E. Jones) O'Neill in Contr. U.S. Natl. Herb. 29: 93. 1945 sec. González-Elizondo & al. 2018≡Cyperus aristatus var. perennis M.E. Jones in Contr. W. Bot. 18: 25. 1933 syn. sec. Govaerts & Simpson 2007