Calflora, a 501c3 non-profit
Distribution by County   9793    
Centromadia pungens  (Hook. & Arn.) Greene
Common tarweed,   Common spikeweed
Centromadia pungens is an annual herb that is native to California, and endemic (limited) to California.
Record Count by County

Alameda: 65 Los Angeles: 17 Riverside: 207 Santa Clara: 48
Butte: 7 Madera: 14 Sacramento: 18 Santa Cruz: 9
Colusa: 6 Marin: 2 San Benito: 199 Siskiyou: 4
Contra Costa: 38 Mendocino: 2 San Bernardino: 18 Solano: 18
El Dorado: 1 Merced: 107 San Diego: 28 Sonoma: 11
Fresno: 97 Modoc: 4 San Francisco: 4 Stanislaus: 26
Kern: 205 Monterey: 102 San Joaquin: 10 Sutter: 5
Kings: 8 Napa: 6 San Luis Obispo: 37 Tehama: 1
Lake: 3 Nevada: 1 San Mateo: 19 Tulare: 84
Lassen: 8 Orange: 1 Santa Barbara: 1 Yolo: 21

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: 01/14/2026).