I finally had a good chance to photograph these spectacular flowers at peak bloom. Photographed at Don Robinson State Park, Jefferson County, MO on 28, Aug, 2021.
Trichostema dichotomum (Forked Bluecurls)
"What a thousand acres of Silphiums looked like when they tickled the bellies of the buffalo is a question never again to be answered, and perhaps not even asked." -Aldo Leopold
A Thousand Acres of Silphiums 