This would appear to be a member of the Senecio Genus (Ragworts) which in turn are part of the larger Daisy (Asteraceae) family. This may be a Senecio plattensis, but it appears to have a different base leaf than the sample shown in Missouri Plants.
I have yet to take the picture that shows their peculiar growth pattern, often standing alone, like sentinels in short new-grass pastures.
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