| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Cannabis sativa | Essential Oil | -- | -- | * | |
| Cannabis sativa | Leaf Essent. Oil | -- | -- | * | |
| Capsicum frutescens | Fruit | -- | -- | * | |
| Centella asiatica | Essential Oil | -- | -- | * | |
| Chrysanthemum x morifolium | Flower | -- | -- | Wealth of India. | |
| Chrysanthemum parthenium | Shoot | -- | 640.0 | -0.1 | Hendriks, H., Bos, R., and Woerdenbag, H. J. 1996. The Essential Oil of Tanacetum parthenium (L.) Schultz-Bip. Flavor and Fragrance Journal 11(6): 367-71. |
| Cinnamomum verum | Stem Bark | -- | -- | * | |
| Cinnamomum verum | Essential Oil | -- | -- | * | |
| Cinnamomum camphora | Leaf | 96.0 | 220000.0 | 4.7 | * |
| Cinnamomum verum | Bark Essent. Oil | -- | -- | * | |
| Cinnamomum verum | Leaf | -- | 5.0 | -0.2 | * |
| Cinnamomum verum | Root Bark | -- | -- | * | |
| Cinnamomum verum | Plant | -- | -- | * | |
| Cleonia lusitanica | Leaf | 5.0 | 7.0 | -0.2 | Perez-Alonso, M., Velasco-Negueruela, A., and Lopez-Saez, A. 1991. The Essential Oil of Cleonia lusitanica. J. Ess. Oil Res., 3: 441-442. |
| Coleus barbatus | Leaf Essent. Oil | -- | 2500.0 | -0.8 | Jim Duke's personal files. |
| Coleus barbatus | Stem Essent. Oil | -- | 2500.0 | Jim Duke's personal files. | |
| Coriandrum sativum | Essential Oil | -- | -- | * | |
| Coriandrum sativum | Fruit | 100.0 | 1300.0 | 1.6 | * |
| Coriandrum sativum | Seed Essent. Oil | -- | 58300.0 | 1.0 | * |
| Crocus sativus | Silk Stigma Style | -- | -- | * |