| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Citrus aurantium | Plant | -- | -- | * | |
| Citrus limon | Tissue Culture | -- | -- | Jim Duke's personal files. | |
| Citrus paradisi | Pericarp | -- | -- | * | |
| Citrus sinensis | Pericarp Essent. Oil | -- | -- | Jim Duke's personal files. | |
| Citrus mitis | Fruit Juice | -- | 0.3 | -1.0 | * |
| Teucrium polium | Shoot | -- | 0.5 | -1.0 | Perez-Alonso, M.J. Velasco-Negueruela, A. and Lopez-Saez, J.A. 1993. The Essential Oils of Two Iberian Teucrium Species. J. Ess. Oil Res. 5: 397-402. |
| Teucrium gnaphalodes | Shoot | -- | 2.0 | 1.0 | Perez-Alonso, M.J. Velasco-Negueruela, A. and Lopez-Saez, J.A. 1993. The Essential Oils of Two Iberian Teucrium Species. J. Ess. Oil Res. 5: 397-402. |
| Citrus sinensis | Fruit | 3.0 | 4.0 | -1.0 | * |
| Citrus reticulata | Fruit | 6.0 | 7.0 | 1.0 | * |
| Citrus sinensis | Fruit Juice | 0.04 | 15.3 | 1.0 | * |
| Callicarpa americana | Leaf | -- | 40.0 | * | |
| Origanum vulgare | Shoot Essent. Oil | -- | 5800.0 | * |