Polymnia johnbeckii
Polymnia johnbeckii, commonly called Beck's leafcup, is a species of flowering plant in the family of Asteraceae. It is a perennial forb found in a single state of the United States. It has white/yellow flowers. Distribution
Polymnia johnbeckii is found in only one of the United States in the state of Tennessee. Its global conservation status is critically imperiled  per Natureserve. References

Asteroideae