Amaranthus palmeri S.Watson (ITIS)
Palmer amaranth, palmer pigweed, carelessweed
Southwestern U.S. (Ward et al. 2013)
Most likely through the transport of contaminated seed; some recent infestations in the Midwest were caused by contaminated Conservation Reserve Program seeding mixes (Ward et al. 2013; Murphy et al. 2017)
One of the most economically important weeds of corn, cotton, and soybean; some populations are resistant to glyphosate and other herbicides (Ward et al. 2013)
Distribution / Maps / Survey Status
The section below contains highly relevant resources for this species, organized by source.
State and Local Government
Culpepper, A.S., T.L. Grey, W.K. Vencill, et al. 2006. Glyphosate-resistant Palmer amaranth (Amaranthus palmeri) confirmed in Georgia. Weed Science 54(4):620-626.
Integrated Taxonomic Information System. Amaranthus palmeri. [Accessed Sep 21, 2023].
Murphy, B.P., D.E. Plewa, E. Phillippi, et al. 2017. A quantitative assay for Amaranthus palmeri identification. Pest Management Science 73(11):2221-2224.
Ward, S.M., T.M. Webster, and L.E. Steckel. 2013. Palmer amaranth (Amaranthus palmeri): a review. Weed Technology 27(1):12-27.