Calflora
Taxon  Report   294    
Ambrosia confertiflora  DC.
Weak leaved burweed,  Weakleaf burr ragweed
Ambrosia confertiflora
© 2014 Richard Spellenberg
Photos from
CalPhotos / Calflora
Ambrosia confertiflora
© 2014 Richard Spellenberg
Ambrosia confertiflora
© 2012 Keir Morse
Ambrosia confertiflora, 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 confertiflora
© 2011 George Butterworth
Family: ASTERACEAE  
Genus: Ambrosia
Communities: Coastal Sage Scrub, Southern Oak Woodland
Name Status:
Accepted by JEF + PLANTS

Alternate Names:
PLANTS: Franseria confertiflora
PLANTS: Franseria strigulosa
PLANTS: Gaertneria tenuifolia
More information about  Ambrosia confertiflora
Nursery / seed vendor availability from CNPLX
Commercial availability unknown.
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 (AMCO3)

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 16, 2018).

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