Psathyrostachys Nevski is a small genus of the tribe Triticeae (Poaceae). It is mainly distributed in arid desert, steppe, and grassland areas in Central Asia, from eastern Turkey to Huashan, Shaanxi, China. It was a new genus proposed in the Proceedings of the Botanical Institute of the USSR Academy of Sciences (Тр. Инст. Ъот. АН СССР) (Vol.1, p. 27) by S. A. Nevski C. in 1933. But it was a naked name. In 1934, it was described in Russian in the Flora of the U.S.S.R (Vol.2, p. 712). In 1936, this genus was formally established with Latin description in the Proceeding of the Botanical Institute of the USSR Academy of Sciences (Тр. Инст. Ъот. АН СССР) (Vol.1, p.57). In 1984, Áskell Löve designated its genome as N in the article titled “Conspectus of the Triticeae”. The N genome symbol was the same as the annual Aegilops uniaristata. In 1994, the 2nd International Triticeae Symposium (Ogan, Utah, USA) published the revised recommendations of the genome nomenclature committee, modifying it to Ns to distinguish it from the N genome designation of the annual Aegilops uniaristata.The Ns genome of Psathyrostachys serves as a donor to Leymus and Pascopyrum. It is a genus endemic to Asia.