| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Carya illinoensis | Seed | 16000.0 | 17000.0 | -0.9 | * |
| Casimiroa edulis | Seed | 11000.0 | 58000.0 | 0.3 | CRC Handbook of Medicinal Herbs and/or CRC Handbook of Proximate Analyses |
| Casimiroa edulis | Fruit | 4800.0 | 27777.0 | -0.7 | * |
| Cassia tora | Sprout Seedling | -- | 99000.0 | 0.9 | * |
| Castanea dentata | Seed | 15600.0 | 28480.0 | -0.6 | * |
| Castanea sativa | Leaf | -- | 44000.0 | -1.3 | * |
| Castanea mollisima | Seed | 16700.0 | 29726.0 | -0.5 | * |
| Castanea sativa | Seed | 12300.0 | 27060.0 | -0.6 | * |
| Catha edulis | Leaf | -- | 16000.0 | -1.8 | * |
| Caulophyllum thalictroides | Root | 16060.0 | 146000.0 | 2.2 | * |
| Cedrela odorata | Seed | -- | 83000.0 | 1.1 | * |
| Ceiba pentandra | Wood | -- | 59000.0 | 2.0 | * |
| Ceiba pentandra | Seed | 61000.0 | 82000.0 | 1.0 | * |
| Cenchrus biflorus | Shoot | 77000.0 | 116000.0 | 0.3 | * |
| Cenchrus biflorus | Seed | 16000.0 | 18000.0 | -0.9 | * |
| Centella asiatica | Leaf | 16050.0 | 150000.0 | 0.5 | * |
| Ceratonia siliqua | Seed | -- | 30000.0 | -0.5 | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |
| Ceratonia siliqua | Fruit | -- | 20000.0 | -0.9 | List, P.H. and Horhammer, L., Hager's Handbuch der Pharmazeutischen Praxis, Vols. 2-6, Springer-Verlag, Berlin, 1969-1979. |
| Chamaemelum nobile | Flower | -- | 62000.0 | -0.1 | * |
| Chamissoa altissima | Leaf | 16670.0 | 166700.0 | 0.8 | Tramil |