Older version of Localities documented in Tropicos sources

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Argentina (South America)
Mexico (Mesoamerica)
United States (North America)
Chile (South America)

Hickman, J. C. 1993. Jepson Man.: Higher Pl. Calif. i–xvii, 1–1400. University of California Press, Berkeley. http://www.tropicos.org/Reference/40453
Soreng, R. J. & J. V. Reyna. 2003. Achnatherum. In Catalogue of New World Grasses (Poaceae): IV. Subfamily Pooideae. Contr. U.S. Natl. Herb. 48: 15–18. http://www.tropicos.org/Reference/1006593