Xyris ambigua, the coastal plain yelloweyed grass, is a North American species of flowering plant in the yellow-eyed-grass family. It is native to southern and eastern Mexico (Tamaulipas, Veracruz, Tabasco, Chiapas, the Yucatán), Central America (Belize, Honduras, Nicaragua), Cuba, and the southeastern and south-central United States (from Texas to Virginia inland to Tennessee and Arkansas).Biota of North America Program 2014 county distribution mapBalick, M. J., M. H. Nee & D.E. Atha. 2000. Checklist of the vascular plants of Belize. Memoirs of The New York Botanical Garden 85: i–ix, 1–246Kral, R. 2001. Xyridaceae. En: Stevens, W.D., C. Ulloa, A. Pool & O.M. Montiel (eds.). Flora de Nicaragua. Monographs in Systematic Botany from the Missouri Botanical Garden 85(3): 2544–2549Carnevali, G., J. L. Tapia-Muñoz, R. Duno de Stefano & I. M. Ramírez Morillo. 2010. Flora Ilustrada de la Peninsula Yucatán: Listado Florístico 1–326
Xyris ambigua is a perennial herb up to 100 cm (40 inches) tall with grass-like leaves and yellow flowers.Flora of North America, Xyris ambigua Beyrich ex Kunth, 1843. The leaves of X. ambigua reach approximately 15 to 40 centimeters (6 to 15 inches) in length.Kral, R. (1960). "The genus Xyris in Florida." Rhodora 62(743): 295-319.
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External links photo of herbarium specimen at Missouri Botanical Garden, collected in British Honduras (Belize) in 1970