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Silene regia
"This striking plant can be found in the Ozark region of Missouri but is sometimes cultivated elsewhere. This species is easy to identify in the field because of its brilliant flowers and stems which have many nodes and leaves."
Spotted along an urban nature trail. (South Creek Greenway Trail)
Thanks for the suggestion, Brian. Based on the petals and other attributes, I am ID'ing this as another species in the same genus you suggested.