Calflora, a 501c3 non-profit
Distribution by County   4065    
Hemizonia congesta  DC.
Hayfield tarweed
Hemizonia congesta is an annual herb that is native to California, and also found elsewhere in western North America.
Record Count by County

Alameda: 61 Los Angeles: 2 San Benito: 49 Solano: 47
Butte: 55 Marin: 365 San Francisco: 4 Sonoma: 351
Colusa: 41 Mendocino: 159 San Joaquin: 3 Sutter: 2
Contra Costa: 88 Monterey: 29 San Luis Obispo: 147 Tehama: 22
El Dorado: 5 Napa: 53 San Mateo: 160 Trinity: 22
Fresno: 2 Nevada: 1 Santa Barbara: 37 Ventura: 2
Glenn: 13 Placer: 2 Santa Clara: 453 Yolo: 37
Humboldt: 86 Plumas: 1 Santa Cruz: 14 Yuba: 1
Lake: 90 Sacramento: 13 Shasta: 4

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: 11/21/2024).