Calflora, a 501c3 non-profit
Distribution by County   9822    
Conyza canadensis  (L.) Cronquist  var. canadensis 

(not an active name)
Canadian horseweed
Conyza canadensis var. canadensis is an annual herb that is native to California.
also called Erigeron canadensis
Record Count by County

Alameda: 19 Kings: 1 Placer: 9 Shasta: 5
Alpine: 3 Lake: 3 Plumas: 26 Sierra: 2
Amador: 3 Lassen: 2 Riverside: 35 Solano: 8
Butte: 59 Los Angeles: 117 Sacramento: 12 Sonoma: 24
Calaveras: 7 Madera: 8 San Benito: 33 Stanislaus: 3
Colusa: 2 Marin: 31 San Bernardino: 59 Sutter: 4
Contra Costa: 22 Mariposa: 4 San Diego: 322 Tehama: 9
El Dorado: 25 Mendocino: 11 San Francisco: 9 Tulare: 4
Fresno: 9 Merced: 6 San Joaquin: 5 Tuolumne: 2
Glenn: 6 Mono: 8 San Luis Obispo: 54 Ventura: 54
Humboldt: 4 Monterey: 111 San Mateo: 61 Yolo: 5
Imperial: 3 Napa: 4 Santa Barbara: 157 Yuba: 9
Inyo: 12 Nevada: 7 Santa Clara: 29
Kern: 25 Orange: 91 Santa Cruz: 34

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: 12/22/2024).