| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Ocimum basilicum | Plant | -- | -- | * | |
| Lavandula x intermedia | Plant | -- | -- | Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980. | |
| Salvia officinalis | Plant | -- | -- | * | |
| Salvia sclarea | Plant | -- | -- | Leung, A.Y., Encyclopedia of Common Natural Ingredients Used in Food, Drugs, and Cosmetics, John Wiley & Sons, New York, 1980. | |
| Artemisia dracunculus | Shoot Essent. Oil | -- | -- | * | |
| Artemisia dracunculus | Shoot | -- | -- | * | |
| Myrtus communis | Plant | 2.0 | 6.0 | Lawrence, B.M., Essential Oils 1976-1977, Essential Oils 1978, Essential Oils 1979-1980. |