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Taxon  Report  
Laennecia coulteri  (A. Gray) G. L. Nesom
Coulter's horseweed
Laennecia coulteri is an annual herb that is native to California, and also found elsewhere in western North America.
also called Conyza coulteri
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
bloom graphic
Bloom Period
Genus: Laennecia
Family: Asteraceae  
Category: angiosperm  
PLANTS group:Dicot
Jepson eFlora section: eudicot

Wetlands: Equally likely to occur in wetlands and non wetlands

Communities: Coastal Sage Scrub, Creosote Bush Scrub, Foothill Woodland, Valley Grassland, wetland-riparian

Name Status:
Accepted by JEF + PLANTS
Alternate Names:
PLANTSConyza coulteri var. virgata
JEF + PLANTSConyza coulteri
PLANTSEschenbachia coulteri
Information about  Laennecia coulteri from other sources
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora

USDA PLANTS Profile (LACO13)

Photos on Calflora

Photos on CalPhotos

Google Images

Photos on iNaturalist

ID Tips on PlantID.net


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2023. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 05/28/2023).