Calflora
Taxon  Report   300    
Ambrosia trifida  L.
Giant ragweed
Ambrosia trifida, a dicot, is an annual herb that is not native to California; it was introduced from elsewhere and naturalized in the wild. There is a high risk of this plant becoming invasive in California according to Cal-IPC.
Observation Hotline
(observation details)
one or more occurrences
within a 7.5-minute quadrangle

Bloom Period
Family: ASTERACEAE  
Genus: Ambrosia
Wetlands: Equally likely to occur in wetlands and non wetlands

Habitat: disturbed

Communities: weed, characteristic of disturbed places, wetland-riparian

Name Status:
Accepted by ICPN + PLANTS

Alternate Names:
ICPN: Ambrosia trifida var. trifida
More information about  Ambrosia trifida

Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2019. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: Aug 20, 2019).