E.  Hackel, ?Gramineae?, in Die naturlichen Pflanzenfamilien, A.  Engler and Prantl, K., Eds. Leipzig: Engelmann, 1887, pp. 1-97.

E.  Hackel, ?Andropogoneae?, in Monographiae phanerogamarum 6, A. & C.  de Candolle, Ed. Paris: Sumptibus G. Masson, 1889, pp. 1-716.

E.  Hackel, The true grasses. New York: Henry Holt & Co., 1890, p. 228.

E.  Hackel, ?A naked grass in the "bristle clade": a phylogenetic and developmental study of Panicum section Bulbosa.?, International Journal of Plant Sciences, vol. 166, pp. 371-381, 2003.