Ambrosia psilostachya DC.

Native to:

Alabama, Alberta, Arizona, Arkansas, British Columbia, California, Colorado, Connecticut, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Louisiana, Maine, Manitoba, Massachusetts, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Mexico, New York, North Carolina, North Dakota, Nova Scotia, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Prince Edward I., Québec, Saskatchewan, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Washington, Wisconsin, Wyoming

Introduced into:

Algeria, Austria, Baltic States, Belgium, Cape Provinces, Denmark, France, Free State, Germany, Great Britain, Hungary, Italy, KwaZulu-Natal, Lesotho, Netherlands, New South Wales, North Caucasus, Northern Provinces, Norway, Poland, Queensland, Romania, South Australia, Spain, Sweden, Switzerland, Taiwan, Transcaucasus, Ukraine, Victoria, Western Australia, Yugoslavia

POWO follows these authorities in accepting this name:

• Flora of North America Editorial Committee (2006). Asteraceae. Flora of North America North of Mexico 21: 1-616. Oxford University Press, New York, Oxford.
• Mirek, Z., Piękoś-Mirkowa, H., Zając, A. & Zając, M (2020). Vascular plants of Poland an annotated checklist: 1-526. W. Szafer institute of botany, Polish academy of sciences, Krakow, Poland.
• Wu, Z. & Raven, P.H. (eds.) (2011). Asteraceae. Flora of China 20-21: 1-992. Science Press (Beijing) & Missouri Botanical Garden Press (St. Louis).

Kew Backbone Distributions

• Flora of China Editorial Committee (1988-2013). Checklist & Addendum. Flora of China Science Press (Beijing) & Missouri Botanical Garden Press (St. Louis).
• Flora of North America Editorial Committee (2006). Asteraceae. Flora of North America North of Mexico 21: 1-616. Oxford University Press, New York, Oxford.