Woolly Elephant's Foot

We have a field of these growing along side our house. It blooms from July to September. The Elephantopus Tomentosus is a species of perennial flowering plant in the family Asteraceae. It's a wildflower in the daisy family. 

Common names include mammoth's foot, devil's grandmother and woolly elephant's foot. 

If interested, here's a bit more info from the Extension Gardener.