Wildflowers of the United States | |||||||||||||||||||||||||||||||||||||||||||
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Grindelia squarrosa - Curlycup Gumweed, Curlytop Gumweed. | Grindelia (Gumweed) is a genus of about 30 species of the Americas, native to parts of South America, Mexico, and the United States, with a few species have spread into Canada as alien. About 18 species are found in the United States, most in the west to the Great Plains, but with a few east of the Mississippi. Grindelia squarrosa is the most widely distributed species of Gumweed in the United States. It is native to the western part of the country into the Great Plains, and has naturalized in much of the rest of the country outside of the deep south. It is considered invasive in parts of its range, spreading rapidly in overgrazed grasslands and dry waste places. Found in: AR, AZ, CA, CO, CT, DE, IA, ID, IL, IN, KS, KY, MA, MD, ME, MI, MN, MO, MT, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SD, TN, TX, UT, VA, VT, WA, WI, WY   Blue=Native; Grey=Introduced Map from USDA Plants Database: USDA, NRCS. 2017. The PLANTS Database (http://plants.usda.gov, 08 May 2025). National Plant Data Team, Greensboro, NC 27401-4901 USA. Search Our Database: Enter any portion of the Scientific, Common Name, or both. Do a general Google search of the entire site: #ad  Follow USWildflowers on Twitter #ad
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