Source: California Invasive Plant Council

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Cynoglossum officinale (houndstongue)

Cynoglossum officinale
Cynoglossum officinale
Photo courtesy Joseph DiTomaso

Cynoglossum officinale (houndstongue) is a biennial forb (family Boraginaceae) whose foliage can be toxic to horses and other livestock when it contaminates hay. In California, it is found in the Cascade Ranges. The seeds have hooked projections that facilitate long distance dispersal by animals and humans.

Cal-IPC Inventory rating: Moderate

Cal-IPC Resources on Cynoglossum officinale

Cal-IPC News Articles

  • None for this species.

Cal-IPC Symposium Proceedings

  • DiTomaso, J. M. (2005). Efficacy and safety of new herbicides on the horizon. California Invasive Plant Council Symposium 2005. Chico, California, CA.
  • Tu, M. and J. M. Randall (2002). 2002 Red alert! New introductions and recent expansions in California. California Exotic Pest Plant Council Symposium 2002. Sacramento, CA.
  • Tu, M. and J. M. Randall (2003). 2003 Cal-IPC red alert! New invasions, recent expansions, and a few others to be on the look-out For. California Invasive Plant Council Symposium 2003. Kings Beach, CA.

Other Resources on Cynoglossum officinale