• Wind Cave National Park - Two Worlds

    Wind Cave

    National Park South Dakota

Wildflowers - Field Pennycress

Field Pennycress, Frenchweed - Thlaspi arvense
Field Pennycress, Frenchweed - Thlaspi arvense
NPS Photo by Jim Pisarowicz
 
Field Pennycress seeds are poisonous to livestock but birds eat the seeds without poisoning.

Did You Know?

A picture of Alvin McDonald in his caving hat.

Alvin McDonald was the first systematic explorer of Wind Cave. He explored the cave from 1890 until his death in 1893. More...