Iran, Iraq; Introduced into: Alabama, Alaska, Albania, Alberta, Algeria, Altay, Amur, Argentina Northeast, Argentina Northwest, Argentina South, Arizona, Arkansas, Austria, Baleares, Baltic States, Bangladesh, Belarus, Belgium, Bermuda, Brazil South, Brazil Southeast, British Columbia, Bulgaria, Burundi, California, Canary Is., Cape Provinces, Cape Verde, Central European Rus, Chatham Is., Chile Central, Chile South, China North-Central, China South-Central, China Southeast, Colombia, Colorado, Connecticut, Corse, Costa Rica, Cuba, Cyprus, Czechoslovakia, Denmark, District of Columbia, Dominican Republic, East European Russia, East Himalaya, Ecuador, Egypt, Ethiopia, Falkland Is., Fiji, Finland, Florida, France, Free State, Georgia, Germany, Great Britain, Greece, Greenland, Guatemala, Haiti, Hawaii, Honduras, Hungary, Iceland, Idaho, Illinois, India, Indiana, Inner Mongolia, Iowa, Irkutsk, Italy, Jamaica, Japan, Jawa, Kamchatka, Kansas, Kazakhstan, Kentucky, Khabarovsk, Kirgizstan, Korea, Kriti, Krym, Kuril Is., Kuwait, KwaZulu-Natal, Laos, Lebanon-Syria, Lesotho, Lesser Sunda Is., Louisiana, Magadan, Maine, Mali, Manitoba, Marianas, Marquesas, Marshall Is., Maryland, Massachusetts, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Mongolia, Montana, Morocco, Myanmar, Nansei-shoto, Nebraska, Netherlands, Nevada, New Brunswick, New Caledonia, New Hampshire, New Jersey, New Mexico, New South Wales, New York, New Zealand North, New Zealand South, Newfoundland, Norfolk Is., North Carolina, North Caucasus, North Dakota, North European Russi, Northern Provinces, Northwest European R, Northwest Territorie, Norway, Nova Scotia, Ohio, Oklahoma, Oman, Ontario, Oregon, Pakistan, Palestine, Pennsylvania, Peru, Philippines, Poland, Portugal, Primorye, Prince Edward I., Puerto Rico, Queensland, Québec, Rhode I., Romania, Sakhalin, Sardegna, Saskatchewan, Sicilia, Sinai, South Australia, South Carolina, South Dakota, South European Russi, Spain, Sri Lanka, Sweden, Switzerland, Tadzhikistan, Tasmania, Tennessee, Texas, Transcaucasus, Trinidad-Tobago, Tunisia, Turkey, Turkey-in-Europe, Turkmenistan, Ukraine, Utah, Uzbekistan, Vermont, Victoria, Vietnam, Virginia, Washington, West Himalaya, West Virginia, Western Australia, Windward Is., Wisconsin, Wyoming, Yugoslavia, Yukon as per POWO;

Avena fatua is a species of grass in the oat genus. It is known as the common wild oat.

This oat is native to Eurasia but it has been introduced to most of the other temperate regions of the world. It is naturalized in some areas and considered a noxious weed in others.
It is a typical oat in appearance, a green grass with hollow, erect stems 1 to 4 feet tall bearing nodding panicles of spikelets. The long dark green leaves are up to a centimeter wide and rough due to small hairs. The seedlings are also hairy.
This and other wild oats can become troublesome in prairie agriculture when it invades and lowers the quality of a field crop, or competes for resources with the crop plants. It takes very few wild oat plants to cause a significant reduction in the yield of a wheat or cultivated oat field, even though the seeds are a type of oat. (taken from Wikipedia on 10.4.13)

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