| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Capsicum annuum | Leaf | -- | -- | * | |
| Convallaria majalis | Plant | -- | -- | * | |
| Uncaria tomentosa | Bark | -- | -- | Van Ginkel, A. 1996. Identification of the Alkaloids and Flavonoids from Uncaria tomentosa Bark by TLC in Quality Control. Phytotherapy Research, 10: S18-S19. | |
| Lycopus virginicus | 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. | |
| Cynara cardunculus | Leaf | -- | -- | * | |
| Capsicum annuum | Fruit | -- | -- | * | |
| Cichorium intybus | Plant | -- | -- | * | |
| Capsicum frutescens | Stem | -- | -- | * | |
| Stachys officinalis | Shoot | -- | -- | * | |
| Houttuynia cordata | Root | -- | -- | * | |
| Agrimonia eupatoria | Leaf | -- | -- | Wealth of India. | |
| Crataegus rhipidophylla | Flower | -- | -- | * | |
| Crataegus rhipidophylla | Fruit | -- | -- | * | |
| Clematis vitalba | Plant | -- | -- | * | |
| Crataegus rhipidophylla | Inflorescence | -- | -- | * | |
| Triticum aestivum | Seed | -- | 5.0 | -0.6 | * |
| Crataegus rhipidophylla | Leaf | -- | -- | * | |
| Crataegus rhipidophylla | Shoot | -- | -- | * | |
| Crataegus rhipidophylla | Bark | -- | -- | * | |
| Crataegus rhipidophylla | Bud | -- | -- | * |