| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Crescentia alata | Seed | -- | 1.2 | -0.9 | * |
| Crocus sativus | Silk Stigma Style | 56.0 | 138.0 | 1.0 | * |
| Cucumis sativus | Fruit | 0.2 | 5.1 | 0.0 | * |
| Cucumis melo | Fruit | 0.2 | 2.4 | -0.6 | USDA's Ag Handbook 8 and sequelae) |
| Cucurbita pepo | Fruit | 1.1 | 13.1 | 1.7 | USDA's Ag Handbook 8 and sequelae) |
| Cucurbita spp | Fruit | 0.4 | 6.0 | 0.2 | * |
| Cucurbita pepo | Flower | 0.7 | 15.0 | 2.1 | USDA's Ag Handbook 8 and sequelae) |
| Cucurbita pepo | Seed | 2.7 | 4.9 | 0.5 | * |
| Cuminum cyminum | Fruit | 3.0 | 4.0 | -0.2 | * |
| Cuminum cyminum | Seed | 3.0 | 4.0 | 0.2 | * |
| Curcuma longa | Plant | -- | -- | * | |
| Curcuma longa | Rhizome | -- | 12.0 | 1.6 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Cyclanthera pedata | Fruit | 0.3 | 5.0 | -0.0 | * |
| Cydonia oblonga | Fruit | 0.3 | 1.9 | -0.7 | * |
| Cynara cardunculus | Flower | 0.6 | 7.0 | 0.2 | * |
| Cyphomandra betacea | Fruit | 0.3 | 3.0 | -0.4 | * |
| Cyrtosperma chamissonis | Root | 0.2 | 1.0 | -0.7 | * |
| Daucus carota | Root | 0.6 | 5.0 | 0.2 | * |
| Dioscorea pentaphylla | Root | 0.2 | 1.0 | -0.7 | * |
| Dioscorea alata | Root | 0.2 | 1.1 | -0.7 | * |