I didn't find in Dr. Duke's database, any information about the uses of Frangula californica
Here is some basic information about Frangula californica.
Frangula californica basic info
Scientific Name: Frangula californica (Eschsch.) A. Gray.
Common names in English: California coffeeberry.
Rhamnus californica, is a species of flowering plant native to California, the Southwestern United States, and Baja California state in Mexico. Also known as California coffeeberry, coffeeberry, and California buckthorn. Native Americans of the west coast of North America had several uses for the plant as food, and used parts of it as a traditional medicinal plant. It was used by indigenous peoples to treat poison oak dermatitis, treat wounds such as burns and as a laxative. - for more info about Frangula californica See link
Frangula californica in other websites
Frangula californica common names, economics importance, distributional range and more in the USDA GRIN website - See link
Search PubMed (US National Library of Medicine National Institutes of Health) for academic researches with the search term Frangula californica - See link
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