Calflora, a 501c3 non-profit
Distribution by County   10256    
Populus fremontii  S. Watson
Alamo cottonwood, Arizona cottonwood
Populus fremontii is a tree that is native to California, and also found elsewhere in western North America.
Record Count by County

Alameda: 58 Lake: 16 Plumas: 1 Siskiyou: 4
Amador: 7 Lassen: 10 Riverside: 266 Solano: 70
Butte: 224 Los Angeles: 222 Sacramento: 346 Sonoma: 54
Calaveras: 10 Madera: 92 San Benito: 265 Stanislaus: 106
Colusa: 102 Marin: 2 San Bernardino: 108 Sutter: 95
Contra Costa: 49 Mariposa: 7 San Diego: 280 Tehama: 144
El Dorado: 37 Mendocino: 15 San Joaquin: 71 Trinity: 34
Fresno: 316 Merced: 65 San Luis Obispo: 72 Tulare: 98
Glenn: 102 Mono: 30 San Mateo: 10 Tuolumne: 6
Humboldt: 4 Monterey: 27 Santa Barbara: 142 Ventura: 190
Imperial: 22 Napa: 18 Santa Clara: 52 Yolo: 108
Inyo: 80 Nevada: 41 Santa Cruz: 7 Yuba: 101
Kern: 152 Orange: 78 Shasta: 77
Kings: 16 Placer: 47 Sierra: 2

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: 04/16/2026).