Naturalized in eastern United States of America (USA); northwest USA, north-central USA, northeast USA, southwest USA, southeast USA: AK, AZ, CA, CO, CT, DC, IA, ID, IL, MA, MD, ME, MI, MN, MT, ND, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SD, TX, UT, VA, VT, WA, WI, WV, WY (USDA 2011). A. geniculatus was found among Maryland herbarium specimens collected before 1753 (Brown et al. 1987).
Naturalized in Canada in British Columbia, Alberta, Saskatchewan, Ontario, Quebec, New Brunswick, Nova Scotia, P.E.I., Newfoundland, and the Yukon since 2000 (NatureServe 2008, Cody et al. 2003).
The first reported specimens from the Great Lakes basin were collected in 1882-1886 in Lake Erie drainage (Fofonoff et al. 2003). Invasion pathways are through shipping, dry ballast, agriculture, and possibly cultivated (Fofonoff et al. 2003).
Found in 4 counties in Michigan: Alpena, Lenawee, Macomb, and Saginaw (University of Michigan: Herbarium 2016). First collected Alpena County in 1988 (University of Michigan: Herbarium 2016).
References: (click for full references)
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This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.