Calflora, a 501c3 non-profit
Distribution by County   9509    
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
Record Count by County

Alameda: 4 Kern: 22 Sacramento: 1 Santa Cruz: 3
Amador: 2 Kings: 2 San Benito: 2 Sonoma: 1
Butte: 2 Los Angeles: 35 San Bernardino: 34 Stanislaus: 6
Colusa: 3 Merced: 4 San Diego: 88 Tulare: 3
Fresno: 3 Mono: 1 San Joaquin: 4 Ventura: 39
Glenn: 2 Monterey: 5 San Luis Obispo: 14
Imperial: 6 Orange: 75 Santa Barbara: 37
Inyo: 8 Riverside: 38 Santa Clara: 2

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]. 2024. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 11/21/2024).