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Project Noah Nature School
Purple, spiky gall. I have consulted many plant identification guides and plant ID forums and nobody seems to be able to say what it is so I think this isn't a fruit of the plant, but rather a gall.
Campsite right outside Yellowstone. I think the plant is either Chrysothamnus or Artemisia
Spotted on May 16, 2013
Submitted on Mar 20, 2014
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