plumeless thistle,
Carduus acanthoides, (Asteraceae).

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Photo by Rich Hanson, USDA-APHIS-PPQ.  Location: Sweet Grass Co., MT.

Photo by Rich Hanson, USDA-APHIS-PPQ.  Location: Sweet Grass Co., MT.

Photo by Rich Hanson, USDA-APHIS-PPQ.  Location: Sweet Grass Co., MT.

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