Monographs Details: Xyris exserta 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 type collection.

Discussion:Type. Flowers yellow; on land at rapids, Rio Guainia, Cano Caribe (between Isla del Venado and San Jose) and vicinity, alt. 850-900 ft, Vaupes, Colombia, 2 Nov 1953, R. E. Schultes, R. E. D. Baker & Isidoro Cabrera 18276 (holotype COL, isotype US).