[Wikipedia] Parasitic Behavior: Like other species of Indian paintbrush, it is a root parasite, feeding off plants such as sagebrush.[1] Although it can survive without parasitizing other plants, individuals that take a host grow faster and larger. (link added by Mary Ann Machi)
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
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[web application]. 2025.The Calflora Database
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https://www.calflora.org/(Accessed: 04/01/2025).