Monographs Details: Xyris aquatica Idrobo & L.B.Sm.
Authority: Maguire, Bassett & Wurdack, John J. 1964. The botany of the Guayana Highland--Part V. Mem. New York Bot. Gard. 10: 1-278.
Description:Distribution and Ecology - Distribution. Known only by the cited specimens.

Discussion:Type. On rocks in swift brook, Rio Caqueta, vicinity of La Pedrera, Apr 1924, Amazonas, Colombia, R. E. Schultes 5855 (holotype COL, isotype US). Paratype. Rio Marmellos, Jul 1948, Amazonas, Brazil, R. E. Schultes & F. Lopez 10307 (US).