P. M.  Peterson, ?Grasses: family Poaceae?, in Plant Conseravation: a ntural history approach, , Ed. Chicago & London: University of Chicago Press, 2005, pp. 104-108.

G.  Davidse, S, M. Sousa, and Chater, A. O., Flora Mesoamericano, vol. 6, Alismataceae a Cyperaceae. Mexico: UNAM, Missouri Botanical Garden, The NAtural History Museum (London), 1994, p. 543.