| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Cucumis sativus | Seed | 66900.0 | 170468.0 | 0.5 | * |
| Cucumis melo | Seed | 99600.0 | 246192.0 | 1.2 | * |
| Cucurbita pepo | Flower | 20.0 | 410.0 | -1.6 | USDA's Ag Handbook 8 and sequelae) |
| Cucurbita foetidissima | Seed | 92340.0 | 221365.0 | 1.0 | Laferriere, J.E., 1988, Nutricomp Program, Nutricomp Database; reviewed in J. Ethnobiology 9(1):27-29. |
| Cucurbita pepo | Seed | 33025.0 | 260000.0 | 1.3 | * |
| Cucurbita maxima | Seed | -- | 151750.0 | 0.4 | * |
| Cucurbita pepo | Fruit | 20.0 | 238.0 | -0.4 | USDA's Ag Handbook 8 and sequelae) |
| Cucurbita spp | Fruit | 330.0 | 5220.0 | -0.3 | * |
| Cyamopsis tetragonoloba | Seed Oil | -- | 472000.0 | 0.3 | 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 | -- | -- | * | |
| Cynara cardunculus | Flower | 460.0 | 3055.0 | 1.1 | USDA's Ag Handbook 8 and sequelae) |
| Cyperus rotundus | Rhizome | -- | -- | * | |
| Cytisus scoparius | Seed | -- | 30960.0 | -0.7 | * |
| Datura stramonium | Seed | 22500.0 | 45000.0 | -0.5 | * |
| Daucus carota | Seed | 9360.0 | 43400.0 | -0.5 | * |
| Daucus carota | Root | 670.0 | 5485.0 | 0.9 | * |
| Dioscorea pentaphylla | Root | 380.0 | 2050.0 | -0.4 | * |
| Dipsacus fullonum | Seed | 90000.0 | 122000.0 | 0.1 | * |
| Dipteryx odorata | Seed | -- | 3850.0 | -0.9 | * |
| Dodonaea viscosa | Seed | 22670.0 | 108470.0 | 0.0 | * |