• Wind Cave National Park - Two Worlds

    Wind Cave

    National Park South Dakota

Wildflowers - Canada Thistle

Canada Thistle - Circium arvense
Canada Thistle - Circium arvense
NPS Photo by Jim Pisarowicz
Canada Thistle is a noxious weed that the park actively works to limit its spread.

Did You Know?

Field Milkvetch

The Field Milkvetch has a colorful flower which is often overlooked because it tends to grow hidden in the grass. Color can vary to reddish-purple. More...