Musk Thistle (Nodding Thistle) (Flowers)

Photo of musk thistle flowerheads showing purplish florets and nodding habit

The rose-purple flower heads of musk thistle are mostly solitary, nod at the branch tips, and are up to 2½ inches wide. At the base of each flower head are numerous, spine-tipped bracts that curve away from the heads. It blooms June through October.

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http://mdc.mo.gov/node/26301