Equisetum hyemale ssp. affine Calflora

Equisetum hyemale L. ssp. affine (Engelm.) Calder & Roy L. Taylor

Giant scouring rush

Equisetum hyemale ssp. affine is a fern that is native to California, and also found elsewhere in North America and beyond.

Record Count by County


Alameda: 17	Lake: 5	Plumas: 15	Siskiyou: 13
Alpine: 5	Lassen: 3	Riverside: 16	Solano: 12
Amador: 2	Los Angeles: 68	Sacramento: 35	Sonoma: 30
Butte: 36	Madera: 2	San Bernardino: 47	Sutter: 1
Colusa: 2	Marin: 30	San Diego: 18	Tehama: 12
Contra Costa: 4	Mariposa: 13	San Francisco: 13	Trinity: 19
Del Norte: 11	Mendocino: 26	San Joaquin: 1	Tulare: 16
El Dorado: 16	Modoc: 5	San Luis Obispo: 12	Tuolumne: 1
Fresno: 25	Mono: 4	San Mateo: 18	Ventura: 21
Glenn: 2	Monterey: 15	Santa Barbara: 34	Yolo: 1
Humboldt: 14	Napa: 3	Santa Clara: 6	Yuba: 1
Imperial: 2	Nevada: 3	Santa Cruz: 20
Inyo: 10	Orange: 15	Shasta: 15
Kern: 2	Placer: 9	Sierra: 3

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: 01/18/2026).