Calflora, a 501c3 non-profit
Distribution by County   13621    
Rhaponticum repens  (L.) Hidalgo
Russian knapweed
Rhaponticum repens is a perennial herb that is not native to California.
also called Acroptilon repens
Cal-IPC rating: moderate
Record Count by County

Alameda: 19 Lake: 2 Placer: 43 Shasta: 7
Alpine: 5 Lassen: 69 Plumas: 12 Sierra: 5
Amador: 5 Los Angeles: 47 Riverside: 43 Siskiyou: 32
Butte: 4 Madera: 5 Sacramento: 17 Solano: 34
Colusa: 4 Marin: 24 San Benito: 25 Sonoma: 2
Contra Costa: 26 Mariposa: 1 San Bernardino: 56 Stanislaus: 2
El Dorado: 10 Merced: 6 San Diego: 17 Sutter: 45
Fresno: 51 Modoc: 16 San Joaquin: 11 Tehama: 3
Glenn: 12 Mono: 15 San Luis Obispo: 46 Tulare: 33
Imperial: 5 Monterey: 20 San Mateo: 1 Tuolumne: 2
Inyo: 19 Napa: 8 Santa Barbara: 34 Ventura: 105
Kern: 48 Nevada: 37 Santa Clara: 18 Yolo: 49
Kings: 43 Orange: 27 Santa Cruz: 7 Yuba: 1

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: 09/28/2023).