| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Sarracenia flava | Essential Oil | -- | -- | * | |
| Juglans nigra | Essential Oil | -- | 26000.0 | * | |
| Laurus nobilis | Leaf Essent. Oil | -- | -- | * | |
| Alpinia galanga | Rhizome | -- | -- | * | |
| Cnicus benedictus | Shoot | -- | -- | Jim Duke's personal files. | |
| Carica papaya | Seed Oil | -- | -- | Jim Duke's personal files. | |
| Piper nigrum | Fruit | -- | -- | * | |
| Scutellaria baicalensis | Root Essent. Oil | -- | -- | * | |
| Melissa officinalis | Tissue Culture | -- | -- | Gbolade, A.A. and Lockwood, G.B. 1991. The Constituents of Melissa officinalis L. Cultures. J. Ess. Oil Res., 3: 111-114. | |
| Piper nigrum | Fruit Essent. Oil | -- | 67800.0 | * |