Calflora
Taxon  Report   298    
Ambrosia psilostachya  DC.
Ragweed,  Western ragweed
Ambrosia psilostachya
© 2011 Aaron Arthur
Photos from
CalPhotos / Calflora
Ambrosia psilostachya
© 2011 Aaron Arthur
Ambrosia psilostachya
© 2014 Richard Spellenberg
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 + photos)



point, line, or polygon

Plant Characteristics
and Associations



Bloom Period
Ambrosia psilostachya
© 2012 Richard Spellenberg
Family: ASTERACEAE  
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 PlantID.net   /   Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

ITIS Original Publication citation

USDA PLANTS Profile (AMPS)

Search the International Plants Names Index

Search efloras.org (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: https://www.calflora.org/   (Accessed: Nov 20, 2018).

The information on this page comes from diverse sources. None of the links are sponsored.