Psyllium seed husks, also known as ispaghula, isabgol, or psyllium, are portions of the seeds of the plant Plantago ovata, (genus Plantago), a native of India, Bangladesh and Pakistan. They are hygroscopic, which allows them to expand and become mucilaginous.

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| Kingdom: | Plantae |
| Family: | Plantaginaceae |
| Genus: | Plantago |