| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Cichorium intybus | Plant | -- | -- | * | |
| Citrus paradisi | Fruit | -- | -- | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses | |
| Citrus limon | Leaf | -- | -- | Jim Duke's personal files. | |
| Citrus limon | Shoot | -- | -- | Jim Duke's personal files. | |
| Coffea arabica | Seed | -- | -- | * | |
| Coriandrum sativum | Shoot | -- | -- | * | |
| Coriandrum sativum | Fruit | -- | -- | * | |
| Cynara cardunculus | Leaf | -- | -- | Jim Duke's personal files. | |
| Datura innoxia | Plant | -- | -- | * | |
| Datura stramonium | Plant | -- | -- | * | |
| Daucus carota | Root | -- | -- | * | |
| Duboisia myoporoides | Shoot | -- | -- | Plouvier, V. 1987. Occurrence and distribution of syringoside, skimmin and similar coumarin glycosides and loganin in several botanical groups. C. R. Acad. Sci. Ser. III, 305(6): 183-186. | |
| Eleutherococcus senticosus | Stem Bark | -- | -- | * | |
| Ficus carica | Leaf | -- | -- | Blaschek, W., Hansel, R., Keller, K., Reichling, J., Rimpler, H., and Schneider, G. eds. 1998. Hager's Handbuch der Pharmazeutischen Praxis, Auflage Band 2 (A-K), 909 pp., (L-Z), 858 pp. Springer-Verlag, Berlin. | |
| Foeniculum vulgare | Seed | -- | -- | Rizk, A.F.M., The Phytochemistry of the Flora of Qatar, Scientific and Applied Research Centre, University of Qatar, Kingprint, Richmond, UK, 1986. | |
| Foeniculum vulgare | Fruit | -- | -- | * | |
| Gelsemium sempervirens | Root | -- | -- | * | |
| Glehnia littoralis | Root | -- | -- | * | |
| Glehnia littoralis | Rhizome | -- | -- | * | |
| Glycyrrhiza uralensis | Shoot | -- | 2.0 | * |