Hordeum distichon

{{Short description|Species of plant in the genus Hordeum}}

{{Speciesbox

|image=140726 Farm Tomita Nakafurano Hokkaido Japan02n.jpg

|image_caption=In a farmfield in Japan

|image2=Illustration Hordeum distichon0.jpg

|image2_caption=Botanical illustration

|genus=Hordeum

|species=distichon

|authority=L.

|synonyms_ref=

|synonyms={{Collapsible list|

• Hordeum anglicum Gand.
• Hordeum bohemicum R.E.Regel
• Hordeum chevalieri R.E.Regel
• Hordeum colchicum R.E.Regel
• Hordeum deficiens Steud. ex A.Braun
• Hordeum distichon convar. nudum (L.) Tzvelev
• Hordeum distichon convar. zeocriton (L.) Tzvelev
• Hordeum elisabethpolense R.E.Regel
• Hordeum eriwanense R.E.Regel
• Hordeum europaeum R.E.Regel
• Hordeum germanicum R.E.Regel
• Hordeum glabrum R.E.Regel
• Hordeum imberbe Ard. ex Roem. & Schult.
• Hordeum irregulare Åberg & Wiebe
• Hordeum kentii R.E.Regel
• Hordeum korshinskianum R.E.Regel
• Hordeum laxum R.E.Regel
• Hordeum lenkoranicum R.E.Regel
• Hordeum macrolepis A.Braun
• Hordeum monticola R.E.Regel
• Hordeum nudideficiens R.E.Regel
• Hordeum praecocius R.E.Regel
• Hordeum princeps R.E.Regel
• Hordeum richardsonii R.E.Regel
• Hordeum scandinavicum R.E.Regel
• Hordeum suecicum R.E.Regel
• Hordeum turkestanicum R.E.Regel
• Hordeum vilmorianum R.E.Regel
• Hordeum volhynicum R.E.Regel
• Hordeum vulgare subsp. deficiens (Steud. ex A.Braun) Á.Löve
• Hordeum vulgare subsp. distichon (L.) Körn.
• Hordeum werneri R.E.Regel
• Hordeum wolgense R.E.Regel
• Hordeum zeocriton L.
• Zeocriton commune P.Beauv.
• Zeocriton distichon (L.) P.Beauv.
• Zeocriton vulgare Gray

}}}}

Hordeum distichon, the common barley or two-rowed barley, is a cultigen of barley, family Poaceae. It is native to Iraq, and is widely grown throughout temperate regions of the world.{{cite web |url=http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:405212-1 |title=Hordeum distichon L. |author= |website=Plants of the World Online |publisher=Board of Trustees of the Royal Botanic Gardens, Kew |access-date=30 July 2021 }} Some authorities consider it a subspecies of six-rowed barley, Hordeum vulgare.{{cite web |title=Hordeum distichon common barley |url=https://www.rhs.org.uk/plants/277898/hordeum-distichon/details |date=2021 |publisher=The Royal Horticultural Society |access-date=30 July 2021 |quote=Other common names; two-rowed barley. Synonyms; Hordeum vulgare subsp. distichon }} It is the principal raw material for malting and brewing beer in Europe, as it is lower in protein than the six-rowed barley usually used in North America.{{cite book |last=Boulton |first=Christopher |date=20 May 2013 |title=Encyclopaedia of Brewing |url= |location= |publisher=Wiley |page= |isbn=9781118598139 }}