[Wikipedia] Psyllium Source: It is a common source of psyllium, a type of dietary fiber. Psyllium seed husks are indigestible and are a source of soluble fiber which may be fermented into butyric acid - a short-chain fatty acid - by butyrate-producing bacteria. Plantago ovata is the most popular source for commercial products containing psyllium. (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
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 03/29/2025).