Curlycup gumweed, Custer State Park, South Dakota, August 22, 2007
Grindelia squarrosa (Wikipedia)
Grindelia squarrosa, also known as a curly-top gumweed or curlycup gumweed, is a small North American biennial or short-lived perennial plant.
It is native to western and central North America, from British Columbia east to Québec and New England, and south as far as California, Arizona, Chihuahua, and Texas. The species may possibly be naturalized in much of the eastern part of that distribution
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