Hymenocephalus rigidus is a species of flowering plant in the daisy family, and is the sole member of its genus Hymenocephalus. This species is native to Iran.http://www.theplantlist.org/tpl1.1/record/gcc-93856Jaubert, Hippolyte François & Spach, Édouard. 1847. Illustrationes Plantarum Orientalium 3: 12http://www.tropicos.org/Name/40029417
References
External links Jstor Global Plants, Holotype of Hymenocephalus rigidus Jaub. & Spach