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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.

1
Roegneria aristiglumis Keng & S.L. Chen China
2
Elymus colorans (Melderis) Á. Löve Afghanistan
3
Elymus dahuricus Turcz. ex Griseb. Baltic States, Bhutan, China, India, Iran, Japan, Kazakhstan, Kyrgyzstan, Mongolia, Nepal, Pakistan, Russia, South Korea, Turkmanistan, Uzbekhistan
4
Elymus drobovii (Nevski) Tzvelev Russia
5
Elymus himalayanus (Nevski) Tzvelev Bhutan, Pakistan, Russia
6
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.
7
Elymus nutans Griseb. Bhutan, China, India, Japan, Mongolia, Pakistan
8
Campeiostachys schrenkiana (Fisch. & C.A. Mey.) Drobow Bhutan, India, Kazakhstan, Kyrghiztan, Mongolia, Nepal. Pakistan, Uzbekistan
9
Elymus tangutorum (Nevski) Hand.-Mazz. Bhutan, China, and Nepal
10
Roegneria tridentataC. Yen & J.L. Yang China
11
Elymus tsukushienis Honda China and Japan (or only Japan if E. kamoji is treated as a distinct taxon)

From Kanchi Gandhi (May 23, 2009): The epithet "humidum", published in 1964, was perfectly OK. In the publication 1964, a reference is made to "A. mayebaranum Honda p.p." and to "Roegneria mayabarana sensu Keng (non Ohwi)." In 1965, Ohwi, without an explanation, changed the 1964 epithet "humidum" to "humidorum." He did not refer to his 1964 publ., nor did he provide a Latin diagnosis, refering only to "A. mayebaranum Honda p.p." Therefore, "A. humidorum" is neither a correction nor a nom. nov., but an invalidly published sp. nov. (invalidly published). Love's 1984 "E. humidorus" may be corrected to "E. humidus". Osada's 1989 publication of E. humidus is an isonym.