Common Crupina (Crupina vulgaris)

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A winter annual. Mature crupina can grow to almost a meter in height, with finely dissected leaves that develop short stiff spines on the edges, giving a coarse rough texture when touched. First rosette leaves entire with toothed margins. Subsequent leaves increasingly lobed. Pink to purple flowers, 1.3 cm long, grow one or two to a branch (up to 40 per plant), developing into seeds with stiff dark bristles on the wide end. Lower leaves can be 7.5 cm long. Common crupina is listed as a prohibited noxious weed on the Weed Seeds Order under the Seeds Act. Its presence in domestic and imported seed for planting is prohibited by CFIA.

Key Identifiers
  • Ranges from 30-100 cm tall.
  • Pinkish-purple flowers surrounded by stiff bracts.
  • Stiff spines on lobed leaf edges.
Location in Canada
Found in areas of the United States but not yet found in Canada.


Richard Old, XID Services, Inc.,

Joseph M. DiTomaso, University of California – Davis,

Similar species
Several knapweeds in the genus Centaurea and Russian knapweed (Rhaponticum repens) superficially resemble common crupina. Unlike common crupina, the knapweeds have flower receptacles with bristles and leaf margins without bristly, barb-tipped hairs.

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For more information about the content of this document, contact Chris Neeser.
This document is maintained by Shelley Barkley.
This information published to the web on April 3, 2012.
Last Reviewed/Revised on August 21, 2018.