| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Acacia tortilis | Plant | -- | -- | * | |
| Acacia farnesiana | Plant | -- | -- | J.S. Glasby Dict.Pls Containing 2ndary Metabolite. 1991. | |
| Arctostaphylos uva-ursi | Leaf | -- | -- | * | |
| Camellia japonica | Leaf | -- | -- | Wealth of India. | |
| Camellia sinensis | Tissue Culture | -- | -- | * | |
| Ginkgo biloba | Leaf | -- | -- | Jim Duke's personal files. | |
| Terminalia arjuna | Bark | -- | -- | Madhusudanamma, W., Sastry, K. N. S., Rao, V. S. S., Reddy, K. K. 1980. Isolation of Flavan-3-ols from Terminalia arjuna Bark. Leather Sci (Madras) 27: 199-200. |