| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Carum carvi | Seed | 123.0 | 1200.0 | 4.9 | * |
| Carum carvi | Fruit | 123.0 | 286.0 | 0.6 | * |
| Carya illinoensis | Seed | 24.0 | 73.0 | -0.4 | * |
| Carya ovata | Shoot | 12.5 | 45.0 | -0.6 | * |
| Carya glabra | Shoot | 10.0 | 429.0 | -0.1 | * |
| Carya ovata | Seed | -- | 32.0 | -0.6 | * |
| Casimiroa edulis | Fruit | 2.0 | 15.0 | -0.5 | * |
| Cassia tora | Seed | -- | 50.0 | -0.5 | * |
| Castanea sativa | Seed | 7.0 | 16.0 | -0.6 | * |
| Castanea mollisima | Seed | 14.0 | 25.0 | -0.6 | * |
| Castanea dentata | Seed | 12.0 | 29.0 | -0.6 | * |
| Catalpa ovata | Fruit | -- | 140.0 | 0.0 | * |
| Catha edulis | Leaf | -- | 185.0 | -0.5 | * |
| Caulophyllum thalictroides | Root | 18.0 | 164.0 | -0.2 | * |
| Celosia cristata | Flower | -- | 180.0 | 0.1 | * |
| Cenchrus biflorus | Seed | 220.0 | 245.0 | 0.4 | * |
| Centaurea cyanus | Plant | -- | -- | * | |
| Centella asiatica | Leaf | 3.0 | 29.0 | -0.8 | * |
| Chaenomeles lagenaria | Fruit | -- | 110.0 | -0.1 | * |
| Chamaemelum nobile | Flower | -- | 170.0 | 0.0 | * |