Marshallia caespitosa
Marshallia caespitosa, commonly called puffballs is a species of plant in the family Asteraceae that is native to the south-central United States. Morphology 
M. caespitosa is a perennial that blooms from late May to early June. The stems are herbaceous with skinny, oblong basal leaves and white to pink-tinged flowers. They are found growing alongside hills, on shale barrens, and rocky limestone outcrops. References

Flora of Northern America
Helenieae