Source: California Invasive Plant Council

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Acroptilon repens (Russian knapweed)

Acroptilon repens
Acroptilon repens
Photo courtesy David Chang

Acroptilon repens (Russian knapweed) is a perennial forb (family Asteraceae) found heavily through out California. It may have allelopathic properties. This plant is toxic to horses and crowds out native species.

Cal-IPC Inventory rating: Moderate

Cal-IPC Resources on Acroptilon repens

Cal-IPC News Articles

  • Brusati, E., D. Morawitz, et al. (2011). Prioritizing Regional Response to Invasive Plants in the Sierra Nevada. Cal-IPC News. 19: 4, 5, 10.

Symposium Proceedings

  • Smith, R. L., V. F. Carrithers, et al. (2006). Managing rangeland invasive plants with Aminopyralid (MilestoneTM). Cal-IPC Symposium. Rohnert Park, CA.
  • Carrithers, V., B. Miller, et al. (2005). Aminopyralid: A new reduced risk active ingredient for control of broadleaf invasive and noxious weeds. California Invasive Plant Council Symposium 2005. Chico, CA.
  • Clines, J. (2005). Preventing weed spread via contaminated hay and straw. California Invasive Plant Council Symposium 2005. Chico, CA.
  • Donaldson, S., W. West, et al. (2003). Getting the job done: Working within the regulatory environment at Lake Tahoe to manage weeds. California Invasive Plant Council Symposium 2003. Kings Beach, California.
  • Gerlach, J. D. (1997). How the west was lost: Reconstructing the invasion dynamics of yellow star-thistle and other plant invaders of western rangelands and natural areas. California Exotic Pest Plant Council Symposium '97. Concord, CA.

Other Resources on Acroptilon repens