| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Piper nigrum | Fruit Essent. Oil | 28200.0 | 151000.0 | * | |
| 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. | |
| Curcuma longa | Leaf | 29.0 | 41.0 | * | |
| Laurus nobilis | Leaf Essent. Oil | -- | -- | * | |
| Hyssopus officinalis | Essential Oil | -- | -- | * | |
| Cinnamomum verum | Root Bark | -- | -- | * | |
| Cinnamomum verum | Leaf Essent. Oil | -- | -- | * | |
| Tanacetum parthenium | Fruit Essent. Oil | -- | -- | * | |
| Cinnamomum verum | Stem Bark | -- | -- | * | |
| Crocus sativus | Silk Stigma Style | -- | -- | * | |
| Ptychopetalum olacoides | Root Essent. Oil | -- | 8000.0 | Uber Bucek, E., Fournier, G., Dadoun, H. 1987. Volatile Constituents of Ptychopetalum olacoides Root Oil. Planta Med. 53, 2: 231. | |
| Thymus vulgaris | Essential Oil | -- | 31800.0 | 1.4 | * |
| Cnicus benedictus | Shoot | -- | -- | Jim Duke's personal files. | |
| Juniperus communis | Essential Oil | -- | -- | * | |
| Juniperus communis | Fruit Essent. Oil | -- | -- | * | |
| Zingiber officinale | Rhizome Essent. Oil | -- | -- | * | |
| Artemisia dracunculus | Shoot | -- | -- | * | |
| Apium graveolens | Seed Essent. Oil | -- | -- | * | |
| Piper nigrum | Seed Essent. Oil | -- | -- | * | |
| Artemisia dracunculus | Essential Oil | -- | -- | * |