| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Aeolanthus myriantha | Flower | -- | -- | Wealth of India. | |
| Agathosma betulina | Leaf Essent. Oil | -- | -- | * | |
| Aloysia citrodora | Plant | 52.0 | 364.0 | -0.2 | * |
| Artemisia dracunculus | Shoot | 670.0 | 6700.0 | 3.5 | * |
| Artemisia dracunculus | Leaf Essent. Oil | -- | 670000.0 | 1.0 | * |
| Artemisia vulgaris | Plant | -- | -- | Williamson, E. M. and Evans, F. J., Potter's New Cyclopaedia of Botanical Drugs and Preparations, Revised Ed., Saffron Walden, the C. W. Daniel Co., Ltd., Essex UK, 362 pp, 1988, reprint 1989. | |
| Bursera delpechiana | Wood | -- | -- | * | |
| Camellia sinensis | Leaf | -- | -- | * | |
| Cananga odorata | Flower | -- | -- | * | |
| Centella asiatica | Shoot | -- | -- | Jim Duke's personal files. | |
| Cinnamomum verum | Plant | -- | -- | * | |
| Cinnamomum verum | Stem Bark | -- | -- | * | |
| Cinnamomum camphora | Leaf | -- | -- | * | |
| Cinnamomum verum | Leaf Essent. Oil | -- | -- | * | |
| Cinnamomum verum | Leaf | -- | 120.0 | 0.1 | Mallavarupu, G. R. et al. 1995. Investigation of the essential oil of cinnamon leaf grown at Bangalore and Hyderabad. Flav. & Fragr. J., 10: 239-242. |
| Cistus ladaniferus | Leaf | 22.0 | 1540.0 | 5.0 | * |
| Citrus paradisi | Pericarp | -- | 3.0 | * | |
| Citrus limon | Pericarp Essent. Oil | -- | -- | Jim Duke's personal files. | |
| Citrus aurantium | Leaf | 100.0 | 150.0 | 0.2 | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |
| Citrus limon | Petiole | -- | 41.0 | * |