A. S.  Hitchcock und Chase, A., Manual of the Grasses of the United States. Washington: United Staes Government Printing Office, 1950.

A.  Chase, Index to Grass Species, 3 vols. G.K.Hall & Co, 1965.

A.  Chase und Niles, C. D., Index to grass species. 3 vols. Boston: G.K. Hall, 1962, S. 1743.