• 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?

Blue Flax

Blue Flax is often considered a subspecies of the Eurasian L. perenne which is very similar. The plant is named after Meriwether Lewis. More...