Calflora, a 501c3 non-profit
Distribution by County   5259    
Lythrum hyssopifolium  L.

(not an active name)
Hyssop loosestrife
Lythrum hyssopifolium is an annual or perennial herb that is not native to California.
Cal-IPC rating: moderate
Record Count by County

Alameda: 57 Lassen: 6 Riverside: 72 Solano: 48
Amador: 7 Los Angeles: 31 Sacramento: 169 Sonoma: 124
Butte: 74 Madera: 13 San Benito: 12 Stanislaus: 2
Calaveras: 17 Marin: 207 San Bernardino: 2 Sutter: 10
Colusa: 11 Mariposa: 17 San Diego: 289 Tehama: 37
Contra Costa: 52 Mendocino: 130 San Francisco: 21 Trinity: 10
Del Norte: 4 Merced: 27 San Joaquin: 10 Tulare: 9
El Dorado: 31 Modoc: 1 San Luis Obispo: 100 Tuolumne: 10
Fresno: 14 Monterey: 98 San Mateo: 127 Ventura: 37
Glenn: 9 Napa: 40 Santa Barbara: 119 Yolo: 26
Humboldt: 47 Nevada: 8 Santa Clara: 44 Yuba: 14
Kern: 4 Orange: 35 Santa Cruz: 45
Kings: 1 Placer: 5 Shasta: 14
Lake: 21 Plumas: 11 Siskiyou: 9

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: 02/10/2026).