J. K. Wipff, „Tragus“, in Flora of North America North of Mexico, vol 25, Magnoliophyta: Commelinidae (in part): Poaceae, part 2., M. E. Barkworth und al, et, Hrsg. 2003, S. 278-281.
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith