Parthenium hysterophorus

Parthenium hysterophorus_Ron Vanderhoff
Photo by Ron Vanderhoff

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

Cal-IPC Assessment

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

Cal-IPC Newsletter Articles

Cal-IPC Symposium Presentations

None for this species.

Other Parthenium hysterophorus Information

  • CalFlora - Distribution information based on submitted observations and herbarium specimens.