Calflora, a 501c3 non-profit
Distribution by County   11946    
Populus trichocarpa  Torr. & A. Gray ex Hook.
Black cottonwood
Populus trichocarpa is a tree that is native to California, and also found elsewhere in North America and beyond.
Record Count by County

Alameda: 13 Kern: 9 Nevada: 17 Santa Barbara: 189
Alpine: 23 Lake: 4 Orange: 70 Santa Clara: 26
Butte: 10 Lassen: 9 Placer: 48 Santa Cruz: 42
Calaveras: 1 Los Angeles: 127 Plumas: 79 Shasta: 24
Colusa: 1 Madera: 3 Riverside: 17 Sierra: 44
Contra Costa: 3 Marin: 2 Sacramento: 1 Siskiyou: 33
Del Norte: 5 Mariposa: 11 San Benito: 2 Tehama: 5
El Dorado: 21 Mendocino: 13 San Bernardino: 59 Trinity: 54
Fresno: 45 Modoc: 18 San Diego: 37 Tulare: 70
Humboldt: 38 Mono: 76 San Luis Obispo: 60 Tuolumne: 10
Inyo: 62 Monterey: 60 San Mateo: 25 Ventura: 147

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).