Onopordum illyricum

Onopordum illyricum_C056-05
Photo: UC Davis Weeds of California

Common names: Illyerian thistle

Onopordum illyricum (Illyerian thistle) is a biennial herb/ (family Asteraceae) with purple flowers and prickly toothed leaves found in the central coast ranges of California. It is native to southeastern Europe. It favors grasslands and riparian and bottomland habitat. It spreads via seeds equipped with fine hairs. The seeds spread via wind, water, wool, vehicles and clothing.

Cal-IPC Rating: Watch

CDFA Rating: -*?


Plant Risk Assessment - An evaluation of the potential for a plant to be invasive in California.

Weed Management Notes

No Weed RIC Management Notes are available for this species. Check for information on other species in the genus on the Weed RIC site.

Cal-IPC Newsletter Articles

There are no newsletter articles associated with this species yet.

Cal-IPC Symposium Presentations

Presentations are linked where available. Where a presentation is not available, find more information by reading the abstract in the Cal-IPC Symposia Archive.

Other Onopordum illyricum Information

  • CalPhotos - Images of plants taken mostly in California.
  • Calflora - Distribution map and records of this species in California.
  • CalWeedMapper - Distribution map of this species in California with ability to determine regional priorities.
  • EDDMapS - Distribution of this species in North America.
  • Jepson Interchange - Information on this plant's taxonomy, biology, and distribution from UC Berkeley's Jepson Herbarium.
  • USDA PLANTS Database - Information on identification and distribution, with links to websites in individual states.
  • Additional photos

    Onopordum illyricum_basal rosette_copyright2001_CDFA
    Onopordum illyricum (Illyerian thistle) basal rosette. Photo: &#169 2001 CDFA
    Onopordum illyricum_flower heads and stem_copyright2001_CDFA
    Onopordum illyricum (Illyerian thistle) flower heads and stem. Photo: &#169 2001 CDFA
    Onopordum illyricum_growth habit_copyright2001_CDFA
    Onopordum illyricum (Illyerian thistle) growth habit. Photo: &#169 2001 CDFA
    Onopordum illyricum_seeds_copyright2001_DeanKelch(CDFA)
    Onopordum illyricum (Illyerian thistle) seeds. Photo: &#169 2001 Dean Kelch, CDFA