Species Species include: •
Hordeum aegiceras – Mongolia, China including Tibet •
Hordeum arizonicum US (CA AZ NV NM), Mexico (Baja California, Sonora, Durango) •
Hordeum bogdanii – from Turkey and European Russia to Mongolia •
Hordeum brachyantherum – Russia (Kuril, Kamchatka), Alaska, Canada including Yukon, US (mostly in the West but also scattered locales in the East), Baja California •
Hordeum brachyatherum – Chile •
Hordeum brevisubulatum – European Russia; temperate and subarctic Asia from Turkey and the Urals to China and Magadan •
Hordeum bulbosum – Mediterranean, Central Asia •
Hordeum californicum – US (CA; OR; NV) •
Hordeum capense – South Africa, Lesotho •
Hordeum chilense – Argentina, Chile (including Juan Fernández Is) •
Hordeum comosum – Argentina, Chile •
Hordeum cordobense – northern Argentina •
Hordeum depressum – US (CA; OR; WA; ID; NV), British Columbia, Baja California •
Hordeum distichon – Iraq •
Hordeum erectifolium – northern Argentina •
Hordeum euclaston – Brazil, Uruguay, Argentina •
Hordeum flexuosum – Uruguay, Argentina •
Hordeum fuegianum – Tierra del Fuego •
Hordeum guatemalense – Guatemala •
Hordeum halophilum – Argentina, Chile, Bolivia, Peru •
Hordeum intercedens (bobtail barley) – California, Baja California •
Hordeum jubatum (foxtail barley) – widespread in US and Canada; Asiatic Russia, Inner Mongolia, Central Asia, Caucasus •
Hordeum × lagunculciforme – Iraq, Turkmenistan, Himalayas, western China •
Hordeum lechleri – Argentina, Chile •
Hordeum marinum (sea barley) – Europe, North Africa, southwestern and central Asia •
Hordeum murinum (wall barley) – Canary Islands, Europe, North Africa, southwestern and central Asia •
Hordeum muticum – Argentina, Chile, Bolivia, Peru •
Hordeum parodii – Argentina •
Hordeum patagonicum – Argentina, Chile •
Hordeum × pavisii – France •
Hordeum procerum – Argentina •
Hordeum pubiflorum – Argentina, Chile •
Hordeum pusillum (little barley) – widespread in Canada and US; northern Mexico, Bermuda, Argentina •
Hordeum roshevitzii – China, Korea, Primorye, Mongolia, Siberia, Kazakhstan •
Hordeum secalinum – Europe, Mediterranean, Caucasus •
Hordeum spontaneum – from Greece and Egypt to central China •
Hordeum stenostachys – Brazil, Argentina, Uruguay, South Africa •
Hordeum tetraploidum – Argentina, Chile •
Hordeum vulgare (barley) – native to the Middle East, now cultivated in many countries
Formerly included species Botanists now regard many species as better suited to other genera: and is akin to the word "
horror". ==Distribution==