| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Corylus avellana | Seed | 5870.0 | 6682.0 | 1.4 | * |
| Crataegus laevigata | Fruit | -- | 2890.0 | -1.2 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Crataegus rhipidophylla | Fruit | -- | 2890.0 | -1.2 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Crescentia alata | Seed | 5300.0 | 5490.0 | 0.5 | * |
| Cucumis melo | Fruit | 350.0 | 3425.0 | -0.4 | USDA's Ag Handbook 8 and sequelae) |
| Cucurbita spp | Fruit | 200.0 | 3165.0 | -0.8 | * |
| Cucurbita pepo | Flower | 150.0 | 3092.0 | -0.6 | USDA's Ag Handbook 8 and sequelae) |
| Cucurbita pepo | Seed | 2730.0 | 5980.0 | 0.9 | * |
| Cucurbita pepo | Fruit | 220.0 | 3095.0 | -0.9 | * |
| Cyclanthera pedata | Fruit | 170.0 | 3160.0 | -0.8 | * |
| Cymbopogon citratus | Plant | -- | 3890.0 | 0.5 | Pedersen, M. 1987. Nutritional Herbology. Pederson Publishing. Bountiful, Utah. 377 pp. |
| Cynara cardunculus | Flower | 470.0 | 3120.0 | -0.5 | USDA's Ag Handbook 8 and sequelae) |
| Cyphomandra betacea | Fruit | 3290.0 | 3550.0 | -0.2 | * |
| Cyrtosperma chamissonis | Root | 619.0 | 3005.0 | -0.8 | * |
| Cyrtosperma chamissonis | Leaf | 348.0 | 3164.0 | 0.2 | * |
| Daucus carota | Root | 430.0 | 3520.0 | 0.3 | * |
| Daucus carota | Resin, Exudate, Sap | -- | 2710.0 | * | |
| Dioscorea sp. | Root | -- | 3840.0 | 1.0 | * |
| Dioscorea alata | Root | 619.0 | 3005.0 | -0.8 | * |
| Dioscorea pentaphylla | Root | 670.0 | 3610.0 | 0.5 | * |