Common names: Santa Maria feverfew
Parthenium hysterophorus (Santa Maria feverfew) is a herb (family Asteraceae) with white flowers and lobed leaves found in the south coast ranges of California. It is native to the American tropics. It favors grasslands and riparian and bottomland habitat. It is a prolific seed producer. Its seeds travel via wind, water, birds, vehicles, farm machinery and other animal traffic.
Cal-IPC Rating: Watch
CDFA Rating: A*
Plant Risk Assessment
Plant Risk Assessment- An evaluation of the potential for a plant to be invasive in California.
Weed Management NotesNo 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
- CDFA expands noxious weed list and revises process. Kelch, Dean. Vol 23, Issue 2
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.
- Successes, failures, and lessons from the Orange County CNPS Emergent Invasive Program. Vanderhoff, Ron (2019)
- New and expanding weeds in California. Kelch, Dean (2011)
Other Parthenium hysterophorus Information
- CalPhotos - Images of plants taken mostly in California.
- Calflora - See the distribution of this species on Calflora's map of California.
- USDA PLANTS Database - Federal database with information on identification and distribution, and links to websites in individual states.
- EDDMapS - North American distribution based on Early Detection and Distribution Mapping System.