Calflora, a 501c3 non-profit
Distribution by County   2317    
Conium maculatum  L.
Poison hemlock
Conium maculatum is a perennial herb that is not native to California.
Cal-IPC rating: moderate
Record Count by County

Alameda: 377 Lake: 24 Plumas: 12 Siskiyou: 75
Alpine: 2 Lassen: 23 Riverside: 70 Solano: 110
Amador: 1 Los Angeles: 380 Sacramento: 135 Sonoma: 232
Butte: 26 Madera: 6 San Benito: 40 Stanislaus: 52
Calaveras: 6 Marin: 878 San Bernardino: 33 Sutter: 15
Colusa: 10 Mariposa: 6 San Diego: 340 Tehama: 15
Contra Costa: 589 Mendocino: 124 San Francisco: 186 Trinity: 25
Del Norte: 10 Merced: 102 San Joaquin: 36 Tulare: 44
El Dorado: 18 Modoc: 35 San Luis Obispo: 168 Tuolumne: 12
Fresno: 18 Mono: 6 San Mateo: 930 Ventura: 169
Glenn: 17 Monterey: 400 Santa Barbara: 143 Yolo: 43
Humboldt: 66 Napa: 20 Santa Clara: 533 Yuba: 25
Inyo: 17 Nevada: 26 Santa Cruz: 307
Kern: 27 Orange: 1202 Shasta: 4
Kings: 2 Placer: 23 Sierra: 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: 11/21/2024).