References

For Piptatheropsis

Barkworth, M.E. 2007e. Piptatherum. In Flora of North America Editorial Committee. 2007a. Flora of North America north of Mexico. Volume 24, Magnoliophyta: Commelinidae (in part): Poaceae, part 1. Oxford Univ. Press, New York, NY. 911 pp. Google Scholar

Romaschenko, K., P.M. Peterson, R.J. Soreng, O. Futorna, and A. Susanna. 2011. Phylogenetics of Piptatherum s.l. (Poaceae: Stipeae): evidence for a new genus, Piptatheropsis, and resurrection of Patis. Taxon 60: 1703-1716. Google Scholar