• 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?

Prairie Dog Barking

Lewis and Clark, while on their journey up the Missouri River in 1804, noted that this "wild dog of the prairie...appears here in infinite numbers." More...