| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Ferula assa-foetida | Seed Essent. Oil | -- | 77100.0 | 1.4 | * |
| Coriandrum sativum | Seed Essent. Oil | 10850.0 | 49600.0 | 0.5 | * |
| Origanum majorana | Essential Oil | -- | 27000.0 | * | |
| Citrus limon | Leaf Essent. Oil | -- | 8100.0 | 1.0 | Jim Duke's personal files. |
| Elettaria cardamomum | Seed Essent. Oil | -- | 7000.0 | -0.8 | * |
| Ocimum basilicum | Leaf Essent. Oil | -- | 5000.0 | -1.0 | * |
| Boswellia sacra | Resin Essent. Oil | -- | 3000.0 | Abdel Wahab, S. M., Aboutabl, E. A., El-Zalabani, S. M., Fouad, H. A., De Pooter, H. L., El-Fallaha, B. 1987. The Essential Oil of Olibanum. Plant Med. 53 (4): 382-384. | |
| Thymus zygis | Shoot | -- | 2050.0 | De Cunha, A.P. and Salguiero, L.R. 1991. The Chemical Polymorphism of Thymus zygis ssp. sylvestris from Central Portugal. J. Ess. Oil Res. 3: 409-12. | |
| Zingiber officinale | Rhizome Essent. Oil | -- | 2000.0 | * | |
| Piper nigrum | Fruit Essent. Oil | -- | 1200.0 | * | |
| Apium graveolens | Seed Essent. Oil | -- | 400.0 | -1.1 | * |
| Mentha x piperita | Leaf | 0.1 | 1.0 | Duke, J. A. Writeups or information summaries on approximately 2,000 economic plants, USDA, ARS, Beltsville, MD 20705. | |
| Myristica fragrans | Essential Oil | -- | -- | * | |
| Myristica fragrans | Seed Essent. Oil | -- | -- | * | |
| Laurus nobilis | Leaf Essent. Oil | -- | -- | * | |
| Coriandrum sativum | Essential Oil | -- | -- | * | |
| Citrus limon | Pericarp Essent. Oil | -- | -- | Jim Duke's personal files. | |
| Alpinia galanga | Rhizome | -- | -- | * | |
| Ocimum basilicum | Essential Oil | -- | -- | * | |
| Cinnamomum verum | Stem Bark | -- | -- | * |