Eleocharis ochrostachys Steud. previously known from Southeastern Asia, Pacific Islands, Sri Lanka, Japan and Brazil (São Paulo State) is recorded in this paper for Rio Grande do Sul and Santa Catarina States, Brazil. A description and illustration of the species is presented, as well as a key to distinguish it from E. acutangula (Roxb.) Schult., E. elongata Chapm., E. interstincta (Vahl) Roem. & Schult., E. mutata (L.) Roem. & Schult., E. obtusetrigona (Lindl. & Nees) Steud. and Eleocharis sp., the other species of subgenus Limnochloa (P. Beauv. ex T. Lestib.) Torr., which occur in both States.
Eleocharis; Cyperaceae; new record; Brazil