Calflora, a 501c3 non-profit
Distribution by County   299    
Ambrosia pumila  (Nutt.) A. Gray
Ragweed, San diego ambrosia, San diego ragweed
Ambrosia pumila is a perennial herb (rhizomatous) that is native to California, and also found in Baja California.
California Rare Plant Rank: 1B.1 (rare, threatened, or endangered in CA and elsewhere)
Federal status: Endangered.
Record Count by County

Los Angeles: 3 Riverside: 31 San Diego: 146

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]. 2026. The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 06/06/2026).