These are seedpods from a waȟpé tȟáŋka (Burdock, or Arcticum minus) plant that I encountered on a fall plant walk. This prickly seedpod is split open to reveal seeds for next year’s babies.
Waȟpé tȟáŋka is not native to North America — it was brought here from Eurasia. But its roots and leaves are excellent medicine, and have many uses. I will write more about the medicinal properties of this plant in a future post.