2019 Nathan Taxel 2019 Nathan Taxel 2018 Ron Vanderhoff 2019 Ron Vanderhoff 2016 Barbara Boethling 2016 Ron Vanderhoff 2018 Ron Vanderhoff 2018 Ron Vanderhoff 2022 Bob Mackie OCPW 2019 Ron Vanderhoff 2016 Barbara Boethling 2016 Ron Vanderhoff 2019 Ron Vanderhoff
Parthenium hysterophorus is a perennial herb that is not native to California.
There is a high risk of this plant becoming invasive in California according to Cal-IPC.
[Wikipedia] American Tropics native, Invasive: Parthenium hysterophorus is a species of flowering plant in the family Asteraceae. It is native to the American tropics. Common names include Santa-Maria, Santa Maria feverfew, whitetop weed, and famine weed. In India, it is locally known as carrot grass, congress grass or Gajar Ghas or Dhanura. It is a common invasive species in India, Australia, and parts of Africa.
Parthenium hysterophorus invades disturbed land, including roadsides. It infests pastures and farmland, causing often disastrous loss of yield, as reflected in common names such as famine weed. In some areas, heavy outbreaks have been ubiquitous, affecting livestock and crop production, and human health (contributed by Mary Ann Machi)
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Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2023. Berkeley, California:The Calflora Database
[a non-profit organization].Available: