| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Ribes nigrum | Bud | -- | -- | * | |
| Rosmarinus officinalis | Resin, Exudate, Sap | -- | -- | * | |
| Rosmarinus officinalis | Leaf Essent. Oil | -- | -- | * | |
| Satureja montana | Essential Oil | -- | 16100.0 | -0.6 | * |
| Tanacetum parthenium | Fruit Essent. Oil | -- | -- | * | |
| Thymus vulgaris | Essential Oil | -- | 31800.0 | 1.4 | * |
| Thymus vulgaris | Plant | 127.0 | 1080.0 | Duke, J. A. Writeups or information summaries on approximately 2,000 economic plants, USDA, ARS, Beltsville, MD 20705. | |
| Zingiber officinale | Rhizome | -- | -- | * | |
| Zingiber officinale | Rhizome Essent. Oil | -- | -- | * |