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Distribution by County   143    
Agrostis exarata  Trin.
Spike bentgrass, Spike redtop
Agrostis exarata is a perennial grasslike herb that is native to California, and also found elsewhere in North America and beyond.
Record Count by County

Alameda: 9 Lake: 33 Plumas: 52 Sierra: 17
Alpine: 8 Lassen: 24 Riverside: 38 Siskiyou: 61
Amador: 12 Los Angeles: 57 Sacramento: 12 Solano: 8
Butte: 87 Madera: 6 San Benito: 152 Sonoma: 59
Calaveras: 4 Marin: 93 San Bernardino: 47 Sutter: 1
Colusa: 10 Mariposa: 19 San Diego: 46 Tehama: 28
Contra Costa: 10 Mendocino: 70 San Francisco: 31 Trinity: 24
Del Norte: 35 Modoc: 30 San Joaquin: 1 Tulare: 29
El Dorado: 42 Mono: 29 San Luis Obispo: 54 Tuolumne: 14
Fresno: 42 Monterey: 74 San Mateo: 67 Ventura: 25
Glenn: 10 Napa: 26 Santa Barbara: 36 Yolo: 2
Humboldt: 75 Nevada: 47 Santa Clara: 11 Yuba: 11
Inyo: 15 Orange: 10 Santa Cruz: 29
Kern: 4 Placer: 62 Shasta: 23

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: 08/18/2026).