Calflora
Taxon  Report   9509    
Laennecia coulteri  (A. Gray) G. L. Nesom
Coulter's horseweed
Laennecia coulteri
© 2006 Adonis (Don) Tate
Photos from
CalPhotos / Calflora
Laennecia coulteri
© 2012 Lynn Robertson
Laennecia coulteri
© 2015 Richard Spellenberg
Laennecia coulteri, a dicot, is an annual herb that is native to California, is also found outside of California, but is confined to western North America.

Interactive Distribution Map


Observation Hotline
(observation details)



point, line, or polygon

Plant Characteristics
and Associations



Bloom Period
Laennecia coulteri
© 2011 Neal Kramer
Family: ASTERACEAE  
Genus: Laennecia
Communities: Valley Grassland, Foothill Woodland, Coastal Sage Scrub, Creosote Bush Scrub, wetland-riparian

Wetlands: Equally likely to occur in wetlands and non wetlands

Name Status:
Accepted by JEF + PLANTS

Alternate Names:
PLANTS: Conyza coulteri var. virgata
PLANTS: Eschenbachia coulteri
ICPN + PLANTS: Conyza coulteri
More information about  Laennecia coulteri
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

USDA PLANTS Profile (LACO13)

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: Dec 10, 2018).

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