Calflora, a 501c3 non-profit
Distribution by County   4312    
Hypericum perforatum  L.
Common st. johnswort,   Klamath weed,   Klamathweed
Hypericum perforatum is a perennial herb that is not native to California.
Cal-IPC rating: moderate
Record Count by County

Alameda: 10 Lassen: 65 Riverside: 4 Siskiyou: 208
Alpine: 2 Los Angeles: 2 Sacramento: 70 Solano: 16
Amador: 112 Madera: 72 San Benito: 3 Sonoma: 182
Butte: 187 Marin: 78 San Bernardino: 3 Stanislaus: 3
Calaveras: 25 Mariposa: 207 San Diego: 20 Sutter: 2
Colusa: 2 Mendocino: 95 San Francisco: 1 Tehama: 113
Contra Costa: 8 Merced: 4 San Joaquin: 3 Trinity: 530
Del Norte: 83 Modoc: 61 San Luis Obispo: 11 Tulare: 1
El Dorado: 220 Monterey: 94 San Mateo: 64 Tuolumne: 284
Fresno: 12 Napa: 31 Santa Barbara: 1 Yolo: 2
Glenn: 24 Nevada: 115 Santa Clara: 24 Yuba: 32
Humboldt: 158 Orange: 1 Santa Cruz: 26
Kern: 5 Placer: 188 Shasta: 356
Lake: 43 Plumas: 84 Sierra: 60

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]. 2023. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 03/28/2023).