Campeiostachys Drobow

Campeiostachys is the generic name that should be applied to members of the Triticeae that have the St, Y and H genomes but no other genomes, if one wishes to recognize such species as a genus. There are nine species that meet this criterion. They are listed in the table below. There is, as yet, no generic treatment of this group of species, all of which are usually included in Elymus. Only one of the species has a combination in Campeiostachys at present.

Roegneria aristiglumis Keng & S.L. Chen China
Elymus colorans (Melderis) Á. Löve Afghanistan
Elymus dahuricus Turcz. ex Griseb. Baltic States, Bhutan, China, India, Iran, Japan, Kazakhstan, Kyrgyzstan, Mongolia, Nepal, Pakistan, Russia, South Korea, Turkmanistan, Uzbekhistan
Elymus drobovii (Nevski) Tzvelev Russia
Elymus himalayanus (Nevski) Tzvelev Bhutan, Pakistan, Russia
Elymus humidus (Ohwi & Sakam.) Á. Löve Japan [Note: This is the same taxon as E. humidorum. It was originally published as Agropyron humidum. Ohwi used "humidorum" in a later publication, without comment. "humidum" is an acceptable epithet so, in the absence of an explanation, it stands].
Elymus kamoji (Ohwi) S.L. Chen Possibly a synonym of E. tsukushiensis; see Lu et al.
Elymus nutans Griseb. Bhutan, China, India, Japan, Mongolia, Pakistan
Campeiostachys schrenkiana (Fisch. & C.A. Mey.) Drobow Bhutan, India, Kazakhstan, Kyrghiztan, Mongolia, Nepal. Pakistan, Uzbekistan
Elymus tangutorum (Nevski) Hand.-Mazz. Bhutan, China, and Nepal
Roegneria tridentataC. Yen & J.L. Yang China
Elymus tsukushienis Honda China and Japan (or only Japan if E. kamoji is treated as a distinct taxon)