Calflora, a 501c3 non-profit
Distribution by County   2327    
Conyza floribunda  Kunth

(not an active name)
Asthmaweed, Tropical horseweed
Conyza floribunda is an annual herb that is not native to California.
New name: Erigeron sumatrensis
Record Count by County

Alameda: 8 Kings: 1 Riverside: 8 Solano: 3
Amador: 1 Los Angeles: 33 Sacramento: 7 Sonoma: 7
Butte: 34 Madera: 1 San Bernardino: 5 Stanislaus: 1
Colusa: 1 Marin: 14 San Diego: 125 Sutter: 5
Contra Costa: 1 Mendocino: 4 San Francisco: 26 Tulare: 1
El Dorado: 4 Merced: 1 San Joaquin: 2 Ventura: 10
Fresno: 4 Monterey: 9 San Luis Obispo: 24 Yolo: 2
Glenn: 3 Napa: 4 San Mateo: 26 Yuba: 4
Humboldt: 1 Orange: 86 Santa Barbara: 29
Kern: 1 Plumas: 1 Santa Cruz: 18

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]. 2026. The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 06/10/2026).