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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: 7 Lake: 33 Plumas: 54 Sierra: 17
Alpine: 8 Lassen: 26 Riverside: 47 Siskiyou: 63
Amador: 13 Los Angeles: 97 Sacramento: 12 Solano: 8
Butte: 87 Madera: 7 San Benito: 151 Sonoma: 63
Calaveras: 4 Marin: 94 San Bernardino: 118 Sutter: 1
Colusa: 11 Mariposa: 19 San Diego: 47 Tehama: 28
Contra Costa: 12 Mendocino: 74 San Francisco: 32 Trinity: 24
Del Norte: 37 Modoc: 29 San Joaquin: 1 Tulare: 35
El Dorado: 45 Mono: 31 San Luis Obispo: 52 Tuolumne: 15
Fresno: 45 Monterey: 73 San Mateo: 66 Ventura: 25
Glenn: 10 Napa: 25 Santa Barbara: 37 Yolo: 2
Humboldt: 82 Nevada: 45 Santa Clara: 12 Yuba: 10
Inyo: 16 Orange: 8 Santa Cruz: 32
Kern: 5 Placer: 66 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: 01/19/2026).