New unicapitate species of Rhynchospora (Cyperaceae) from South America. Brittonia 55: 30–36. 2003.—Resolution of species delimitations in the Rhynchospora globosa complex has revealed three species new to science from South America: R. bracteovillosa, R. leucoloma, and R. melanocarpa. Each species is described and illustrated and its geographical distribution discussed.