Calflora, a 501c3 non-profit
Distribution by County   2324    
Conyza bonariensis  (L.) Cronquist

(not an active name)
Asthmaweed,   Flax leaved fleabane,   Horseweed,   South american horseweed
Conyza bonariensis is an annual herb that is not native to California.
also called Erigeron bonariensis
Record Count by County

Alameda: 25 Los Angeles: 116 San Benito: 3 Solano: 7
Amador: 3 Marin: 11 San Bernardino: 31 Sonoma: 8
Butte: 14 Mendocino: 4 San Diego: 203 Stanislaus: 4
Colusa: 4 Merced: 7 San Francisco: 24 Sutter: 5
Contra Costa: 14 Monterey: 55 San Joaquin: 14 Tehama: 6
El Dorado: 7 Napa: 3 San Luis Obispo: 47 Tulare: 1
Fresno: 5 Nevada: 1 San Mateo: 27 Ventura: 58
Glenn: 4 Orange: 119 Santa Barbara: 66 Yolo: 7
Imperial: 1 Placer: 2 Santa Clara: 14 Yuba: 3
Kern: 12 Riverside: 52 Santa Cruz: 10
Kings: 1 Sacramento: 10 Shasta: 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: 05/15/2024).