J. K.  Wipff, ?Bouteloua?, in Flora of North America North of Mexico, vol 25, Magnoliophyta: Commelinidae (in part): Poaceae, part 2., M. E.  Barkworth and al, et, Eds. 2003, pp. 250-269.

J. K.  Wipff, ?Tragus?, in Flora of North America North of Mexico, vol 25, Magnoliophyta: Commelinidae (in part): Poaceae, part 2., M. E.  Barkworth and al, et, Eds. 2003, pp. 278-281.

J. K.  Wipff, ?Digitaria?, in Flora of North America North of Mexico, vol 25, Magnoliophyta: Commelinidae (in part): Poaceae, part 2., M. E.  Barkworth and al, et, Eds. 2003, pp. 358-383.

J. K.  Wipff, ?Schizachyrium?, in Flora of North America North of Mexico, vol 25, Magnoliophyta: Commelinidae (in part): Poaceae, part 2., M. E.  Barkworth and al, et, Eds. 2003, pp. 666-677.