| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Anacardium occidentale | Fruit | -- | -- | * | |
| Angelica archangelica | Root | -- | -- | * | |
| Angelica archangelica | Root Essent. Oil | -- | -- | * | |
| Apium graveolens | Seed Essent. Oil | -- | -- | * | |
| Apium graveolens | Essential Oil | -- | -- | * | |
| Artemisia dracunculus | Shoot | -- | -- | * | |
| Artemisia dracunculus | Essential Oil | -- | -- | * | |
| Artemisia capillaris | Plant | -- | -- | * | |
| Cinnamomum verum | Stem Bark | -- | -- | * | |
| Cinnamomum verum | Leaf Essent. Oil | -- | -- | * | |
| Cinnamomum verum | Root Bark | -- | -- | * | |
| Cnicus benedictus | Shoot | -- | -- | Jim Duke's personal files. | |
| Coleus barbatus | Stem Essent. Oil | -- | 7400.0 | Jim Duke's personal files. | |
| Coleus barbatus | Leaf Essent. Oil | -- | 7400.0 | -1.0 | Jim Duke's personal files. |
| Coriandrum sativum | Essential Oil | -- | -- | * | |
| Crocus sativus | Silk Stigma Style | -- | -- | * | |
| Cuminum cyminum | Seed Essent. Oil | -- | 200.0 | -1.0 | * |
| Curcuma longa | Leaf | 29.0 | 41.0 | * | |
| Cymbopogon parkeri | Plant | -- | -- | Rizk, A.F.M., The Phytochemistry of the Flora of Qatar, Scientific and Applied Research Centre, University of Qatar, Kingprint, Richmond, UK, 1986. | |
| Hyssopus officinalis | Essential Oil | -- | -- | * |