Calflora, a 501c3 non-profit
Distribution by County   11669    
Erigeron sumatrensis  Retz.
Tropical horseweed
Erigeron sumatrensis is an annual herb that is not native to California.
Record Count by County

Alameda: 6 Kings: 1 Sacramento: 5 Sonoma: 5
Amador: 1 Los Angeles: 28 San Bernardino: 7 Stanislaus: 1
Butte: 27 Madera: 1 San Diego: 127 Sutter: 5
Colusa: 1 Marin: 14 San Francisco: 20 Tulare: 1
Contra Costa: 1 Mendocino: 3 San Joaquin: 2 Ventura: 9
El Dorado: 4 Merced: 1 San Luis Obispo: 19 Yolo: 2
Fresno: 4 Monterey: 8 San Mateo: 27 Yuba: 4
Glenn: 3 Napa: 5 Santa Barbara: 26
Humboldt: 1 Orange: 62 Santa Cruz: 17
Kern: 1 Riverside: 9 Solano: 3

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).