Calflora, a 501c3 non-profit
Distribution by County   8366    
Xanthium spinosum  L.
Spiny clotbur,   Spiny cockleburr
Xanthium spinosum is an annual herb that is not native to California.
Record Count by County

Alameda: 27 Madera: 1 San Benito: 44 Sonoma: 39
Butte: 17 Marin: 58 San Bernardino: 10 Stanislaus: 2
Calaveras: 2 Mendocino: 7 San Diego: 14 Sutter: 6
Colusa: 2 Merced: 7 San Francisco: 1 Tehama: 3
Contra Costa: 53 Modoc: 2 San Joaquin: 5 Trinity: 1
El Dorado: 4 Monterey: 45 San Luis Obispo: 47 Tulare: 3
Glenn: 1 Napa: 8 San Mateo: 28 Tuolumne: 1
Humboldt: 6 Nevada: 2 Santa Barbara: 60 Ventura: 43
Kern: 22 Orange: 20 Santa Clara: 29 Yolo: 3
Lake: 1 Placer: 2 Santa Cruz: 12 Yuba: 4
Lassen: 2 Riverside: 5 Shasta: 1
Los Angeles: 639 Sacramento: 8 Solano: 10

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: 12/03/2024).