| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Asclepias syriaca | Sprout Seedling | -- | -- | * | |
| Aspalathus linearis | Shoot | -- | 44000.0 | -0.8 | * |
| Aspidosperma quebracho-blanco | Bark | 30000.0 | 40000.0 | -0.9 | * |
| Atropa bella-donna | Root | -- | 120000.0 | 1.4 | * |
| Azadirachta indica | Stem Bark | -- | 60000.0 | -0.4 | * |
| Ballota nigra | Plant | -- | -- | * | |
| Berberis vulgaris | Fruit | -- | 55600.0 | -0.4 | Jim Duke's personal files. |
| Berberis vulgaris | Plant | -- | -- | Williamson, E. M. and Evans, F. J., Potter's New Cyclopaedia of Botanical Drugs and Preparations, Revised Ed., Saffron Walden, the C. W. Daniel Co., Ltd., Essex UK, 362 pp, 1988, reprint 1989. | |
| Borago officinalis | Plant | -- | 30000.0 | -0.8 | * |
| Bryonia alba | Root | -- | -- | * | |
| Buxus sempervirens | Leaf | -- | -- | * | |
| Byrsonima crassifolia | Bark | 172500.0 | 282600.0 | 1.2 | Morton, J.F., Major Medicinal Plants. 1977. Atlas of Medicinal Plants of Middle America. Bahamas to Yucatan. 1981. |
| Caesalpinia pulcherrima | Leaf | -- | 7000.0 | -1.3 | * |
| Caesalpinia pulcherrima | Wood | -- | 3000.0 | -1.0 | * |
| Calendula officinalis | Leaf | -- | 64500.0 | -0.6 | * |
| Camellia sinensis | Leaf | 33800.0 | 270000.0 | 1.9 | * |
| Capparis spinosa | Plant | -- | -- | * | |
| Capsella bursa-pastoris | Plant | -- | -- | * | |
| Carum carvi | Plant | -- | -- | * | |
| Castanea sativa | Bark | 40000.0 | 120000.0 | -0.2 | * |