Calflora, a 501c3 non-profit
Distribution by County   9597    
Nasturtium officinale  W. T. Aiton
Watercress
Nasturtium officinale is a perennial herb (aquatic) that is native to California, and also found elsewhere in North America and beyond.
also called Rorippa nasturtium-aquaticum
Record Count by County

Alameda: 48 Lake: 6 Placer: 16 Shasta: 9
Alpine: 6 Lassen: 28 Plumas: 11 Sierra: 13
Amador: 5 Los Angeles: 1197 Riverside: 99 Siskiyou: 2
Butte: 34 Madera: 9 Sacramento: 6 Solano: 11
Calaveras: 15 Marin: 90 San Benito: 62 Sonoma: 59
Colusa: 5 Mariposa: 8 San Bernardino: 86 Stanislaus: 3
Contra Costa: 39 Mendocino: 59 San Diego: 328 Sutter: 4
Del Norte: 1 Merced: 3 San Francisco: 24 Tehama: 13
El Dorado: 20 Modoc: 3 San Joaquin: 1 Trinity: 3
Fresno: 21 Mono: 39 San Luis Obispo: 97 Tulare: 55
Glenn: 4 Monterey: 54 San Mateo: 76 Tuolumne: 8
Humboldt: 24 Napa: 9 Santa Barbara: 96 Ventura: 245
Inyo: 60 Nevada: 20 Santa Clara: 63 Yuba: 5
Kern: 70 Orange: 100 Santa Cruz: 37

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: 12/03/2024).