Taxon  Report   298    
Ambrosia psilostachya  DC.
Ragweed,  Western ragweed
Ambrosia psilostachya
© 2014 Richard Spellenberg
Photos from
CalPhotos / Calflora
Ambrosia psilostachya
© 2012 Richard Spellenberg
Ambrosia psilostachya
© 2011 Aaron Arthur
Ambrosia psilostachya, a dicot, is a perennial herb that is native to California, is also found elsewhere in North America and beyond.

Interactive Distribution Map

Observation Hotline
(observation details)

point, line, or polygon

Plant Characteristics
and Associations

Bloom Period
Ambrosia psilostachya
© 2011 Aaron Arthur
Genus: Ambrosia
Communities: weed, characteristic of disturbed places, wetland-riparian

Wetlands: Occurs usually in non wetlands, occasionally in wetlands

Habitat: disturbed

Name Status:
Accepted by JEF + PLANTS

Alternate Names:
PLANTS: Ambrosia californica
PLANTS: Ambrosia coronopifolia
PLANTS: Ambrosia cumanensis
. . .
More information about  Ambrosia psilostachya
Nursery / seed vendor availability from CNPLX
This plant is available commercially.
Landscaping information from Calscape
Photos on   /   Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

ITIS Original Publication citation


Search the International Plants Names Index

Search (Flora of North America)

website references from Google

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]. 2018. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: Dec 17, 2018).