The Musk Thistle, sometimes known as the nodding thistle, is an aggressive, invasive noxious weed that has been found on Tinker Air Force Base for the first time. This photo shows the various stages of the flower from the newly formed flower phase to the large rose-purple bulb, then the drying phase. The third flower from the left shows the seeds starting to come out to spread. One plant can contain up to 20,000 seeds. (Air Force photo by Kimberly Woodruff)

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Photo by: Kimberly Woodruff |  VIRIN: 210609-F-FH087-0003.JPG