Ambrosia psilostachya DC., Prodr. 5: 526 (1836) (syn: Ambrosia californica Rydb. ; Ambrosia coronopifolia Torr. & A.Gray ; Ambrosia lindheimeriana Scheele ; Ambrosia peruviana DC. ; Ambrosia psilostachya var. californica (Rydb.) S.F.Blake ; Ambrosia psilostachya var. coronopifolia (Torr. & A.Gray) Farw. ex Fernald ; Ambrosia psilostachya var. lindheimeriana (Scheele) Blank. ; Ambrosia rugelii Rydb. );
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N. & S. America: 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 as per POWO;
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Ambrosia psilostachya from Canada GS-05032024-1: 6 high res. images.
Sharing Ambrosia psilostachya photographed from Brampton Canada on 2-11-2022.
Earlier I had shared A. artemisiifolia from Mississauga Canada. The two differ as under:
A. artemisiifolia: Plants annual, erect, leaves 1-2-pinnately lobed, petioles 2.5-6 cm long.
A. psilostachya: Plants perennial, leaves 1-pinnately lobed, petioles shorter than 2.5 cm
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References:
POWO Catalogue of Life Wikipedia minnesota wild flowers calscape Wild flowers FEIS
