| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Corylus avellana | Seed | 425000.0 | 572650.0 | 3.7 | * |
| Crescentia alata | Seed | -- | -- | Tramil | |
| Crocus sativus | Silk Stigma Style | -- | -- | * | |
| Croton tiglium | Seed | 111000.0 | 185000.0 | 0.5 | * |
| Cryptostegia grandifolia | Seed | -- | 41525.0 | -0.6 | * |
| Cucumis sativus | Fruit | 20.0 | 506.0 | -0.5 | * |
| Cucumis melo | Cotyledon | 40500.0 | 195300.0 | -0.4 | * |
| Cucumis sativus | Cotyledon | 55200.0 | 241000.0 | 0.9 | * |
| Cucumis sativus | Seed | 116100.0 | 180000.0 | 0.5 | * |
| Cucumis melo | Seed | 81000.0 | 200700.0 | 0.7 | * |
| Cucurbita spp | Fruit | 140.0 | 2215.0 | -0.5 | * |
| Cucurbita pepo | Flower | 40.0 | 825.0 | -0.6 | USDA's Ag Handbook 8 and sequelae) |
| Cucurbita foetidissima | Seed | 56135.0 | 169500.0 | 0.4 | * |
| Cucurbita pepo | Seed | 70000.0 | 234570.0 | 0.9 | * |
| Cucurbita maxima | Seed | -- | 128065.0 | 0.1 | * |
| Cucurbita pepo | Fruit | 60.0 | 714.0 | -0.5 | USDA's Ag Handbook 8 and sequelae) |
| Cuminum cyminum | Seed | -- | 154000.0 | 0.3 | * |
| Cuminum cyminum | Seed Oil | -- | -- | * | |
| Cyamopsis tetragonoloba | Seed Oil | -- | 290000.0 | -0.2 | Varade, P. B., Misra, B. K., Sikka, K. C., Singh, S. P. 1984. Nutritive Assessment of Guar Oil (Cyamopsis tetragonoloba L. Taub). J Agr Food Chem, 32(5): 1073-1075. |
| Cydonia oblonga | Seed | -- | -- | * |