Source: California Invasive Plant Council
URL of this page: http://www.cal-ipc.org/ip/management/plant_profiles/Hypericum_perforatum.php
Hypericum perforatum (St. John's wort, klamathweed)
Hypericum perforatum (common St. Johnswort, klamathweed) is an perennial plant (family Clusiaceae) grown for medicinal use, but it can be toxic to light colored livestock when consumed in large quantities. By 1940, more than 1 million hectares of California were infested by St. Johnswort, but biological control agents have eliminated most populations below 1500 m elevation.
Cal-IPC Inventory rating: Moderate
Cal-IPC Resources on Hypericum perforatum
- California Invasive Plant Inventory Plant Assessment Form - Information gathered by Cal-IPC on the impacts, rate of spread, and distribution of invasive plants in California. Does not include management information.
- CalWeedMapper - Statewide maps, climate models, and reports.
- Cal-IPC News - Articles from our quarterly newsletter. Each issue is available as a pdf. List of articles on Hypericum perforatum.
- Cal-IPC Symposium Proceedings - Presentations and papers from our annual Symposium. List of articles on Hypericum perforatum.
Cal-IPC News Articles
- Anonymous(1995). Biological control of invasive exotic pest plant species: A report on the importance of maintaining and enhancing our nation's biological control capabilities. CalEPPC News. 3: 6-10.
- Connick, S. and M. Gerel (2005). Don't sell a pest: A new partnership to prevent plant invasions through horticulture. Cal-IPC News. 13: 4-5,14.
- Donaldson, S. (2003). Fighting weeds in the Tahoe basin. CalEPPC News. 11: 7.
- Hoekstra, B. (1997). Klamathweed. CalEPPC News. 5: 9.
- Pitcairn, M. (2000). All weeds that have approved biological control agents, accidental introductions and others. CalEPPC News. 8.
Cal-IPC Symposium Proceedings
- Connick, S. and M. Gerel (2004). Partnering to prevent invasions of plants of horticultural origin. California Invasive Plant Council Symposium 2004. Ventura, 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, CA.
- Kirk, A. A., T. Widmer, et al. (2003). The potential contribution of natural enemies from Mediterranean Europe to the management of the invasive weed Arundo donax (Graminae; Arundinae) in the U.S. California Invasive Plant Council Symposium 2003. Kings Beach, CA.
- Pitcairn, M. J. and D. M. Woods (1998). Control methods: Biological control. California Exotic Pest Plant Council Symposium '98. Ontario, CA.
- Pitcairn, M. J. and D. M. Woods (1998). Control methods: biological control. California Exotic Pest Plant Council Symposium 1998. Ontario, CA.
- Thomsen, C. D., W. A. Williams, et al. (1996). Yellow starthistle management with grazing, mowing, and competitive plantings. California Exotic Pest Plant Council Symposium '96. San Diego, CA.
Other Resources on Hypericum perforatum
- USDA PLANTS database - Federal database with information on identification and distribution, and links to websites in individual states.
- Jepson Online Interchange for California Flora - Information on taxonomy, biology, and distribution from the UC Berkeley Jepson Herbarium.
- CalFlora - Distribution information by county based on submitted observations and herbarium specimens.
- The Nature Conservancy Management Summary - Information compiled by TNC land managers. Photos included for some species.
- CalPhotos - Images of plants taken mostly in California.