| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Petroselinum crispum | Leaf | -- | 0.18 | * | |
| Eriodictyon californicum | Resin, Exudate, Sap | -- | -- | Leung, A.Y., Encyclopedia of Common Natural Ingredients Used in Food, Drugs, and Cosmetics, John Wiley & Sons, New York, 1980. | |
| Adonis vernalis | Plant | -- | -- | * |