Calflora, a 501c3 non-profit
Distribution by County   11667    
Erigeron canadensis  L.
Canada horseweed
Erigeron canadensis is an annual herb that is native to California, and also found elsewhere in North America and beyond.
also called Conyza canadensis
Record Count by County

Alameda: 36 Kings: 2 Placer: 11 Shasta: 9
Alpine: 3 Lake: 6 Plumas: 33 Sierra: 6
Amador: 3 Lassen: 8 Riverside: 78 Siskiyou: 1
Butte: 75 Los Angeles: 246 Sacramento: 23 Solano: 12
Calaveras: 9 Madera: 19 San Benito: 48 Sonoma: 35
Colusa: 6 Marin: 77 San Bernardino: 115 Stanislaus: 8
Contra Costa: 33 Mariposa: 15 San Diego: 370 Sutter: 8
El Dorado: 32 Mendocino: 24 San Francisco: 39 Tehama: 22
Fresno: 31 Merced: 18 San Joaquin: 10 Trinity: 2
Glenn: 7 Mono: 24 San Luis Obispo: 64 Tulare: 14
Humboldt: 15 Monterey: 131 San Mateo: 68 Tuolumne: 4
Imperial: 4 Napa: 18 Santa Barbara: 174 Ventura: 137
Inyo: 17 Nevada: 13 Santa Clara: 37 Yolo: 8
Kern: 49 Orange: 126 Santa Cruz: 56 Yuba: 13

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).