[Wikipedia] Medicinal Uses: The Seri refer to desert broom as cascol caaco, and make a decoction by cooking the twigs. This drink is used to treat colds, sinus headache, and general sore achey ailments. The same tea is also used as a rub for sore muscles (link added by Mary Ann Machi)
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2025.The Calflora Database
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https://www.calflora.org/(Accessed: 03/31/2025).