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Wind Cave National Park Common Mullein
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Wind Cave National Park
Wildflowers - Canada Thistle
 
Canada Thistle - Circium arvense
NPS Photo by Jim Pisarowicz
Canada Thistle - Circium arvense
 
Canada Thistle is a noxious weed that the park actively works to limit its spread.

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Blue Flax

Did You Know?
Blue Flax is often considered a subspecies of the Eurasian L. perenne which is very similar. The plant is named after Meriwether Lewis.
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Last Updated: July 24, 2007 at 18:02 MST